View Filing Data

$ 9,880

$ 9,151

^[1]

$ 18,030

$ 16,804

^[1]

314

273

^[1]

607

511

^[1]

583

584

^[1]

1,172

1,119

^[1]

10,777

10,008

^[1]

19,809

18,434

^[1]

Operating expense:

Regional capacity purchase

2,878

2,842

^[1]

5,604

5,478

^[1]

Aircraft fuel

2,390

1,669

^[1]

4,355

3,229

^[1]

681

549

^[1]

1,300

1,085

^[1]

Landing fees and other rent

603

541

^[1]

1,161

1,085

^[1]

Depreciation and amortization

557

536

^[1]

1,098

1,054

^[1]

Aircraft maintenance materials and outside repairs

438

472

^[1]

878

926

^[1]

Special charges (Note 10)

393

385

^[1]

735

704

^[1]

Aircraft rent

119

152

^[1]

246

331

^[1]

129

^[1]

169

^[1]

1,428

1,381

^[1]

2,826

2,690

^[1]

9,616

8,571

^[1]

18,372

16,677

^[1]

1,161

1,437

^[1]

1,437

1,757

^[1]

Nonoperating income (expense):

(177)

(167)

^[1]

(353)

(329)

^[1]

Interest capitalized

^[1]

Interest income

^[1]

(166)

(27)

^[1]

(118)

(69)

^[1]

(304)

(160)

^[1]

(396)

(330)

^[1]

857

1,277

^[1]

1,041

1,427

^[1]

173

456

^[1]

210

507

^[1]

$ 684

$ 821

^[1],[2]

$ 831

$ 920

^[1],[2]

$ 2.49

$ 2.67

^[1]

$ 2.97

$ 2.96

^[1]

$ 2.48

$ 2.67

^[1]

$ 2.96

^[1]

Operating revenue:

$ 9,880

$ 9,151

^[3]

$ 18,030

$ 16,804

^[1]

314

273

^[3]

607

511

^[1]

583

584

^[3]

1,172

1,119

^[1]

10,777

10,008

^[3]

19,809

18,434

^[1]

Operating expense:

Regional capacity purchase

2,878

2,842

^[3]

5,604

5,478

^[1]

Aircraft fuel

2,390

1,669

^[3]

4,355

3,229

^[1]

681

549

^[3]

1,300

1,085

^[1]

Landing fees and other rent

603

541

^[3]

1,161

1,085

^[1]

Depreciation and amortization

557

536

^[3]

1,098

1,054

^[1]

Aircraft maintenance materials and outside repairs

438

472

^[3]

878

926

^[1]

Special charges (Note 10)

393

385

^[3]

735

704

^[1]

Aircraft rent

119

152

^[3]

246

331

^[1]

129

^[3]

169

^[1]

1,428

1,380

^[3]

2,825

2,689

^[1]

9,616

8,570

^[3]

18,371

16,676

^[1]

1,161

1,438

^[3]

1,438

1,758

^[1]

Nonoperating income (expense):

(177)

(167)

^[3]

(353)

(329)

^[1]

Interest capitalized

^[3]

^[1]

Interest income

^[3]

^[1]

(167)

(28)

^[3]

(119)

(69)

^[1]

(305)

(161)

^[3]

(397)

(330)

^[1]

856

1,277

^[3]

1,041

1,428

^[1]

172

457

^[3]

210

508

^[1]

$ 684

$ 820

^[3],[4]

$ 831

$ 920

^[3],[4]

[1]	Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606) and Accounting Standards Update No. 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.
[2]	Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606) and Accounting Standards Update No. 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.
[3]	Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606) and Accounting Standards Update No. 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.
[4]	Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606) and Accounting Standards Update No. 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.

Statements of Consolidated Comprehensive Income (Loss) (Unaudited) - USD ($)
$ in Millions

3 Months Ended

6 Months Ended

Jun. 30, 2018

Jun. 30, 2017

Jun. 30, 2018

Jun. 30, 2017

Other comprehensive income (loss), net change related to:

$ 684

$ 821

^[1],[2]

$ 831

$ 920

^[1],[2]

Employee benefit plans, net of taxes

^[2]

(4)

^[2]

Investments and other, net of taxes

(12)

^[2]

(11)

^[2]

Total comprehensive income, net

(8)

^[2]

(15)

^[2]

696

813

^[2]

876

905

^[2]

Other comprehensive income (loss), net change related to:

684

820

^[3],[4]

831

920

^[3],[4]

Employee benefit plans, net of taxes

^[4]

(4)

^[4]

Investments and other, net of taxes

(12)

^[4]

(11)

^[4]

Total comprehensive income, net

(8)

^[4]

(15)

^[4]

$ 696

$ 812

^[4]

$ 876

$ 905

^[4]

[1]	Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606) and Accounting Standards Update No. 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.
[2]	Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606) and Accounting Standards Update No. 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.
[3]	Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606) and Accounting Standards Update No. 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.
[4]	Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606) and Accounting Standards Update No. 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.

Consolidated Balance Sheets (Unaudited) - USD ($)
$ in Millions

Jun. 30, 2018

Dec. 31, 2017

Receivables, less allowance for doubtful accounts (2018 — $7; 2017 — $7)

$ 2,884

$ 1,482

^[1]

Short-term investments

2,187

2,316

^[1]

1,840

1,340

^[1]

Aircraft fuel, spare parts and supplies, less obsolescence allowance (2018 — $380; 2017 — $354)

942

924

^[1]

1,028

1,071

^[1]

8,881

7,133

^[1]

Owned—

30,143

28,692

^[1]

Total owned property and equipment

7,481

6,946

^[1]

37,624

35,638

^[1]

Less — Accumulated depreciation and amortization

(11,974)

(11,159)

^[1]

Total owned property and equipment, net

25,650

24,479

^[1]

Purchase deposits for flight equipment

894

1,344

^[1]

Capital leases—

1,224

1,151

^[1]

Less — Accumulated amortization

^[1]

Total capital leases

1,235

1,162

^[1]

(833)

(777)

^[1]

Total capital leases, net

402

385

^[1]

Total operating property and equipment, net

26,946

26,208

^[1]

Intangibles, less accumulated amortization (2018 — $1,346; 2017 — $1,313)

Goodwill

4,523

^[1]

3,399

3,539

^[1]

Investments in affiliates and other, net

^[1]

848

852

^[1]

Total other assets

8,864

9,005

^[1]

44,691

42,346

^[1]

Current liabilities:

5,826

3,940

^[1]

Accounts payable

2,703

2,196

^[1]

Accrued salaries and benefits

2,206

2,192

^[1]

1,782

2,166

^[1]

Current maturities of long-term debt

887

1,565

^[1]

Current maturities of capital leases

117

128

^[1]

571

576

^[1]

Long-term obligations under capital leases

14,092

12,763

^[1]

Long-term debt

12,460

11,703

^[1]

1,039

996

^[1]

Other liabilities and deferred credits:

Postretirement benefit liability

2,783

2,591

^[1]

1,585

1,602

^[1]

Pension liability

1,815

1,921

^[1]

Lease fair value adjustment, net

419

204

^[1]

155

198

^[1]

1,704

1,634

^[1]

Commitments and contingencies

8,461

8,150

^[1]

Stockholders' equity:

Preferred stock

^[1]

Common stock

^[1]

Additional capital invested

6,091

6,098

^[1]

Stock held in treasury, at cost

5,367

4,549

^[1]

(1,720)

(769)

^[1]

Accumulated other comprehensive loss

(1,102)

(1,147)

^[1]

8,639

8,734

^[1]

44,691

42,346

^[1]

Receivables, less allowance for doubtful accounts (2018 — $7; 2017 — $7)

2,878

1,476

^[2]

Short-term investments

2,187

2,316

^[2]

1,840

1,340

^[2]

Aircraft fuel, spare parts and supplies, less obsolescence allowance (2018 — $380; 2017 — $354)

942

924

^[2]

1,028

1,071

^[2]

8,875

7,127

^[2]

Owned—

30,143

28,692

^[2]

Total owned property and equipment

7,481

6,946

^[2]

37,624

35,638

^[2]

Less — Accumulated depreciation and amortization

(11,974)

(11,159)

^[2]

Total owned property and equipment, net

25,650

24,479

^[2]

Purchase deposits for flight equipment

894

1,344

^[2]

Capital leases—

1,224

1,151

^[2]

Less — Accumulated amortization

^[2]

Total capital leases

1,235

1,162

^[2]

(833)

(777)

^[2]

Total capital leases, net

402

385

^[2]

Total operating property and equipment, net

26,946

26,208

^[2]

Intangibles, less accumulated amortization (2018 — $1,346; 2017 — $1,313)

Goodwill

4,523

^[2]

3,399

3,539

^[2]

Investments in affiliates and other, net

^[2]

848

852

^[2]

Total other assets

8,864

9,005

^[2]

44,685

42,340

^[2]

Current liabilities:

5,826

3,940

^[2]

Accounts payable

2,703

2,196

^[2]

Accrued salaries and benefits

2,206

2,192

^[2]

1,782

2,166

^[2]

Current maturities of long-term debt

887

1,565

^[2]

Current maturities of capital leases

117

128

^[2]

575

581

^[2]

Long-term obligations under capital leases

14,096

12,768

^[2]

Long-term debt

12,460

11,703

^[2]

1,039

996

^[2]

Other liabilities and deferred credits:

Postretirement benefit liability

2,783

2,591

^[2]

1,585

1,602

^[2]

Pension liability

1,815

1,921

^[2]

Lease fair value adjustment, net

446

231

^[2]

155

198

^[2]

1,704

1,634

^[2]

Commitments and contingencies

8,488

8,177

^[2]

Stockholders' equity:

Common stock

^[2]

Additional capital invested

841

1,787

^[2]

Accumulated other comprehensive loss

8,971

8,146

^[2]

(1,102)

(1,147)

^[2]

Receivable from related parties

(108)

(90)

^[2]

8,602

8,696

^[2]

Cash Flows from Operating Activities:

$ 44,685

$ 42,340

^[2]

[1]	Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.
[2]	Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Receivables, allowance for doubtful accounts	$ 7	$ 7
Aircraft fuel, spare parts and supplies, obsolescence allowance	380	354
Intangibles, accumulated amortization	$ 1,346	$ 1,313
Common stock, par value	$ 0.01	$ 0.01
Common shares, authorized	1,000,000,000	1,000,000,000
Common shares, outstanding	273,017,840	286,973,195
United Airlines, Inc.
Receivables, allowance for doubtful accounts	$ 7	$ 7
Aircraft fuel, spare parts and supplies, obsolescence allowance	380	354
Intangibles, accumulated amortization	$ 1,346	$ 1,313
Common stock, par value	$ 0.01	$ 0.01
Common shares, authorized	1,000	1,000
Common shares, issued	1,000	1,000
Common shares, outstanding	1,000	1,000

Statements of Consolidated Cash Flows (Unaudited) - USD ($)
$ in Millions

6 Months Ended

Jun. 30, 2018

Jun. 30, 2017

Net cash provided by operating activities

$ 4,175

$ 2,108

Cash Flows from Investing Activities:

Capital expenditures

(1,734)

(1,780)

Purchases of short-term and other investments

(1,326)

(1,587)

Proceeds from sale of short-term and other investments

1,455

1,561

Investment in affiliates

(139)

Proceeds from sale of property and equipment

Net cash used in investing activities

123

(1,717)

(1,678)

Cash Flows from Financing Activities:

Proceeds from issuance of long-term debt and airport construction financing

1,308

1,139

Repurchases of common stock

(969)

(712)

Payments of long-term debt

(1,294)

(525)

Principal payments under capital leases

(62)

(59)

Net cash used in financing activities

(41)

(75)

(1,058)

(232)

Net increase in cash, cash equivalents and restricted cash

1,400

198

Cash, cash equivalents and restricted cash at beginning of the period

1,591

2,303

Cash, cash equivalents and restricted cash at end of the period

^[1]

2,991

2,501

Investing and Financing Activities Not Affecting Cash:

Property and equipment acquired through the issuance of debt and capital leases

139

907

Airport construction financing

Cash Flows from Operating Activities:

Net cash provided by operating activities

4,158

2,095

Cash Flows from Investing Activities:

Capital expenditures

(1,734)

(1,780)

Purchases of short-term investments and other investments

(1,326)

(1,587)

Proceeds from sale of short-term and other investments

1,455

1,561

Investment in affiliates

(139)

Proceeds from sale of property and equipment

Net cash used in investing activities

123

(1,717)

(1,678)

Cash Flows from Financing Activities:

Proceeds from issuance of long-term debt and airport construction financing

1,308

1,139

Dividend to UAL

(969)

(712)

Payments of long-term debt

(1,294)

(525)

Principal payments under capital leases

(62)

(59)

Net cash used in financing activities

(24)

(62)

(1,041)

(219)

Net increase in cash, cash equivalents and restricted cash

1,400

198

Cash, cash equivalents and restricted cash at beginning of the period

1,585

2,297

Cash, cash equivalents and restricted cash at end of the period

^[2]

2,985

2,495

Investing and Financing Activities Not Affecting Cash:

Property and equipment acquired through the issuance of debt and capital leases

139

907

Airport construction financing

$ 12

$ 32

[1]

The following table provides a reconciliation of cash, cash equivalents and restricted cash to amounts reported within the consolidated balance sheet:Reconciliation of cash, cash equivalents and restricted cash: Current assets: Cash and cash equivalents$2,884 $2,371Restricted cash included in Prepaid expenses and other13 15Other assets: Restricted cash94 115Total cash, cash equivalents and restricted cash $2,991 $2,501

[2]

The following table provides a reconciliation of cash, cash equivalents and restricted cash to amounts reported within the consolidated balance sheet:Reconciliation of cash, cash equivalents and restricted cash: Current assets: Cash and cash equivalents$2,878 $2,365Restricted cash included in Prepaid expenses and other13 15Other assets: Restricted cash94 115Total cash, cash equivalents and restricted cash $2,985 $2,495

Statements of Consolidated Cash Flows (Parenthetical) - USD ($)
$ in Millions

Jun. 30, 2018

Dec. 31, 2017

Jun. 30, 2017

Restricted cash included in Prepaid expenses and other

$ 2,884

$ 1,482

^[1]

$ 2,371

Total cash, cash equivalents and restricted cash

^[1]

115

2,991

^[2]

1,591

2,501

^[2]

Restricted cash included in Prepaid expenses and other

2,878

1,476

^[3]

2,365

Total cash, cash equivalents and restricted cash

^[3]

115

$ 2,985

^[4]

$ 1,585

$ 2,495

^[4]

[1]	Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.
[2]	The following table provides a reconciliation of cash, cash equivalents and restricted cash to amounts reported within the consolidated balance sheet:Reconciliation of cash, cash equivalents and restricted cash: Current assets: Cash and cash equivalents$2,884 $2,371Restricted cash included in Prepaid expenses and other13 15Other assets: Restricted cash94 115Total cash, cash equivalents and restricted cash $2,991 $2,501
[3]	Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.
[4]	The following table provides a reconciliation of cash, cash equivalents and restricted cash to amounts reported within the consolidated balance sheet:Reconciliation of cash, cash equivalents and restricted cash: Current assets: Cash and cash equivalents$2,878 $2,365Restricted cash included in Prepaid expenses and other13 15Other assets: Restricted cash94 115Total cash, cash equivalents and restricted cash $2,985 $2,495

Recently Issued Accounting Standards

6 Months Ended

Jun. 30, 2018

New Accounting Pronouncements and Changes in Accounting Principles [Abstract]

Recently Issued Accounting Standards

RECENTLY ISSUED ACCOUNTING STANDARDS

The Company adopted Financial Accounting Standards Board ("FASB") Accounting Standards Codification Topic 606, Revenue from Contracts with Customers (the "New Revenue Standard"), effective January 1, 2018 using the full-retrospective method. Topic 606 prescribes that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. For the Company, the most significant impact of the standard is the reclassification of certain ancillary fees from other operating revenue into passenger revenue on the statement of consolidated operations. These ancillary fees are directly related to passenger travel, such as ticket change fees and baggage fees, and are no longer considered distinct performance obligations separate from the passenger travel component. In addition, the ticket change fees, which were previously recognized when received, are now recognized when transportation is provided. Adoption of the standard had no impact on the Company's consolidated cash flows statements.

The Company adopted Accounting Standards Update No. 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost (the "New Retirement Standard"), effective January 1, 2018 using the full-retrospective method. The New Retirement Standard requires employers to present the service cost component of the net periodic benefit cost in the same income statement line item as other employee compensation costs arising from services rendered during the period. The other components of net benefit cost, including interest cost, expected return on plan assets, amortization of prior service cost/credit and actuarial gain/loss, and settlement and curtailment effects, are to be presented outside of any subtotal of operating income. The Company elected to apply the practical expedient and use the amounts disclosed in Note 5 to the financial statements included in Part I, Item 1 of the Company's Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2017 as the estimation basis for applying the retrospective presentation requirements of the standard.

The new standards had the same impact on the financial statements of United as they had on the financial statements of UAL. The table below presents the impact of the adoption of the New Revenue Standard and the New Retirement Standard on select accounts and captions of the statement of consolidated operations for the three months ended June 30, 2017 (in millions, except per share amounts):



	Three Months Ended June 30, 2017
	As Previously Reported			New Revenue Standard Adjustments			New Retirement Standard Adjustments			As Adjusted
Passenger revenue	$	8,622		$	529		$	—		$	9,151
Cargo	254			19			—			273
Other operating revenue	1,124			(540		)	—			584
Total operating revenue	10,000			8			—			10,008

Salaries and related costs	2,868			—			(26		)	2,842
Distribution expenses	362			23			—			385
Other operating expenses	1,408			(27		)	—			1,381
Total operating expenses	8,601			(4		)	(26		)	8,571

Operating income	1,399			12			26			1,437

Interest expense	(158		)	(9		)	—			(167		)
Miscellaneous, net	(1		)	—			(26		)	(27		)
Total nonoperating expense, net	(125		)	(9		)	(26		)	(160		)

Income before income taxes	1,274			3			—			1,277
Income tax expense	456			—			—			456
Net income	818			3			—			821

Earnings per share, basic	2.67			—			—			2.67
Earnings per share, diluted	2.66			0.01			—			2.67

The table below presents the impact of the adoption of the New Revenue Standard and the New Retirement Standard on select accounts and captions of the statement of consolidated operations for the six months ended June 30, 2017 (in millions, except per share amounts):



	Six Months Ended June 30, 2017
	As Previously Reported			New Revenue Standard Adjustments			New Retirement Standard Adjustments			As Adjusted
Passenger revenue	$	15,796		$	1,008		$	—		$	16,804
Cargo	474			37			—			511
Other operating revenue	2,150			(1,031		)	—			1,119
Total operating revenue	18,420			14			—			18,434

Salaries and related costs	5,529			—			(51		)	5,478
Distribution expenses	669			35			—			704
Other operating expenses	2,740			(50		)	—			2,690
Total operating expenses	16,743			(15		)	(51		)	16,677

Operating income	1,677			29			51			1,757

Interest expense	(308		)	(21		)	—			(329		)
Miscellaneous, net	(18		)	—			(51		)	(69		)
Total nonoperating expense, net	(258		)	(21		)	(51		)	(330		)

Income before income taxes	1,419			8			—			1,427
Income tax expense	505			2			—			507
Net income	914			6			—			920

Earnings per share, basic	2.95			0.01			—			2.96
Earnings per share, diluted	2.94			0.02			—			2.96

The table below presents the impact of the adoption of the New Revenue Standard on UAL's balance sheet accounts and captions as of December 31, 2017 (in millions):



	At December 31, 2017
	As Previously Reported		New Revenue Standard Adjustments		As Adjusted
Prepaid expenses and other	$	1,051	$	20	$	1,071
Total current assets	7,113		20		7,133
Total assets	42,326		20		42,346



Advance ticket sales	3,876	64		3,940
Frequent flyer deferred revenue	2,176	16		2,192
Other	569	7		576
Total current liabilities	12,676	87		12,763

Frequent flyer deferred revenue - long-term	2,565	26		2,591
Deferred income taxes	225	(21	)	204
Total other liabilities and deferred credits	8,145	5		8,150

Retained earnings	4,621	(72	)	4,549
Total stockholders' equity	8,806	(72	)	8,734
Total liabilities and stockholders' equity	42,326	20		42,346

The Company adopted Accounting Standards Update No. 2016-01, Financial Instruments—Overall (Subtopic 825-10) effective January 1, 2018. This standard makes several changes, including the elimination of the available-for-sale classification of equity investments, and requires equity investments with readily determinable fair values to be measured at fair value with changes in fair value recognized in earnings. The Company reclassified to retained earnings $7 million of unrealized loss on the Company's investment in Azul, S.A. ("Azul") which was previously classified as an available-for-sale security. See Notes 4 and 7 to the financial statements included in this Part I, Item 1 for additional information.

Accounting for Leases. In February 2016, the FASB amended the FASB Accounting Standards Codification and created a new Topic 842, Leases. The guidance requires lessees to recognize a right-of-use asset and a lease liability for all leases (with the exception of short-term leases) at the commencement date and recognize expenses on their income statements similar to the current Topic 840, Leases. The new lease standard is effective for fiscal years and interim periods beginning after December 15, 2018, and early adoption is permitted. Lessees and lessors are required to adopt the new lease standard using a modified retrospective approach for all leases existing at or commencing after the date of initial application with an option to use certain practical expedients. We have not finalized our assessment but believe this standard will have a significant impact on our consolidated balance sheets. The standard is not expected to have a material impact on the Company's results of operations or cash flows. The primary effect of adopting the new standard will be to record assets and obligations for our operating leases.

Revenue

6 Months Ended

Jun. 30, 2018

Revenue from Contract with Customer [Abstract]

Revenue

REVENUE

The Company presents Passenger revenue, Cargo revenue and Other operating revenue on its income statement. Passenger revenue is recognized when transportation is provided and Cargo revenue is recognized when shipments are delivered. Other operating revenue is recognized as the related performance obligations are satisfied.

The Company sells passenger ticket and related ancillary services for mainline and regional flights primarily via credit cards with payments collected by the Company in advance of the performance of related services. The Company initially records ticket sales in its Advance ticket sales liability, deferring revenue recognition until the travel occurs. For travel that has more than one flight segment, the Company deems each segment as a separate performance obligation and recognizes revenue for each segment as travel occurs. Tickets sold by other airlines where the Company provides the transportation are recognized as passenger revenue at the estimated value to be billed to the other airline when travel is provided. Differences between amounts billed and the actual amounts may be rejected and rebilled or written off if the amount recorded was different from the original estimate. When necessary, the Company records a reserve against its billings and payables with other airlines based on historical experience.

The Company sells certain tickets with connecting flights with one or more segments operated by its other airline partners. For segments operated by its other airline partners, the Company has determined that it is acting as an agent on behalf of the other airlines as they are responsible for their portion of the contract (i.e. transportation of the passenger). The Company, as the agent, recognizes revenue within Other operating revenue at the time of the travel for the net amount representing commission to be retained by the Company for any segments flown by other airlines.

Refundable tickets expire after one year from the date of issuance. Non-refundable tickets generally expire on the date of the intended travel, unless the date is extended by notification from the customer on or before the intended travel date.

The Company records breakage revenue on the travel date for its estimate of tickets that will expire unused. To determine breakage, the Company uses its historical experience with refundable and nonrefundable expired tickets and other facts, such as recent aging trends, program changes and modifications that could affect the ultimate expiration patterns of tickets. Fees charged in association with changes or extensions to non-refundable tickets are considered part of the Company's passenger travel obligation. As such, those fees are deferred at the time of collection and recognized at the time the travel is provided.

United initially capitalizes the costs of selling airline travel tickets and then recognizes those costs as Distribution expense at the time of travel. Passenger ticket costs include credit card fees, travel agency and other commissions paid, as well as global distribution systems booking fees.

Ticket Taxes. Certain governmental taxes are imposed on the Company's ticket sales through a fee included in ticket prices. The Company collects these fees and remits them to the appropriate government agency. These fees are recorded on a net basis and, as a result, are excluded from revenue.

Accounts Receivable. Accounts receivable primarily consist of amounts due from credit card companies, non-airline partners, and cargo transportation customers. We provide an allowance for uncollectible accounts equal to the estimated losses expected to be incurred based on historical write-offs and other specific analyses. Bad debt expense and write-offs were not material for the three and six months ended June 30, 2018 and 2017.

Advance Ticket Sales. Advance ticket sales represent the Company's liability to provide air transportation in the future. In the three and six months ended June 30, 2018, the Company recognized approximately $2.7 billion and $2.2 billion, respectively, and in the three and six months ended June 30, 2017, the Company recognized approximately $2.6 billion and $2.2 billion respectively, of passenger revenue for tickets that were included in Advance ticket sales at the beginning of those periods. All tickets sold at any given point of time have travel dates extending up to twelve months. As a result, the balance of the Company's Advance ticket sales liability represents activity that will be recognized in the next twelve months.

Frequent Flyer Accounting. United's MileagePlus program builds customer loyalty by offering awards, benefits and services to program participants. Members in this program earn miles for travel on United, United Express, Star Alliance members and certain other airlines that participate in the program. Members can also earn miles by purchasing the goods and services of our network of non-airline partners. We have contracts to sell miles to these partners with the terms extending from one to eight years. These partners include domestic and international credit card issuers, retail merchants, hotels, car rental companies and our participating airline partners. Miles can be redeemed for free (other than taxes and government imposed fees), discounted or upgraded air travel and non-travel awards. Miles expire after 18 months of member account inactivity.

Miles Earned in Conjunction with Travel. When frequent flyers earn miles for flights, the Company recognizes a portion of the ticket sales as revenue when the travel occurs and defers a portion of the ticket sale representing the value of the related miles as a separate performance obligation. The Company determines the estimated selling price of travel and miles as if each element is sold on a separate basis. The total consideration from each ticket sale is then allocated to each of these elements, individually, on a pro rata basis. At the time of travel, the Company records the portion allocated to the miles to Frequent flyer deferred revenue on the Company's consolidated balance sheet and subsequently recognizes it into revenue when miles are redeemed for air travel and non-air travel awards.

The Company's estimated selling price of miles is based on an equivalent ticket value less breakage, which incorporates the expected redemption of miles, as the best estimate of selling price for these miles. The equivalent ticket value is based on the prior 12 months' weighted average equivalent ticket value of similar fares as those used to settle award redemptions while taking into consideration such factors as redemption pattern, cabin class, loyalty status and geographic region. The estimated selling price of miles is adjusted by breakage that considers a number of factors, including redemption patterns of various customer groups. The Company reviews its breakage estimates annually based upon the latest available information regarding redemption and expiration patterns. The Company's estimate of the expected expiration of miles requires significant management judgment. Current and future changes to expiration assumptions or to the expiration policy, or to program rules and program redemption opportunities, may result in material changes to the deferred revenue balance as well as recognized revenues from the program. For the portion of the outstanding miles that we estimate will not be redeemed, we recognize the associated value proportionally as the remaining miles are redeemed.

Co-Brand Agreement. United has a significant contract to sell MileagePlus miles to its co-branded credit card partner Chase Bank USA, N.A. ("Chase"). Chase awards miles to MileagePlus members based on their credit card activity. United identified the following significant separately identifiable performance obligations in the co-brand agreement:

•

MileagePlus miles awarded - United has a performance obligation to provide MileagePlus cardholders with miles to be used for air travel and non-travel award redemptions. The Company records Passenger revenue related to the travel awards when the transportation is provided and records Other revenue related to the non-travel awards when the goods or services are delivered. The Company records the cost associated with non-travel awards in Other operating revenue.

•

Marketing - United's performance obligation is to provide Chase access to its customer list and the use of its brand. United determined access to its customer list and use of the United brand constitute a single performance obligation by virtue of being highly interdependent and interrelated. Marketing revenue is recorded to Other operating revenue over the term of the co-brand agreement based on customers' use of the MileagePlus credit card.

•

Advertising - United has a performance obligation to provide advertising in support of the MileagePlus card in various customer contact points such as United's website, email promotions, direct mail campaigns, airport advertising and in-flight advertising. Advertising revenue is recorded to Other operating revenue as advertising is provided over the term of the co-brand agreement in accordance with customers' use of the MileagePlus credit card.


•	Other travel-related benefits - United's performance obligations are comprised of various items such as waived bag fees, seat upgrades, and lounge passes. Lounge passes are recorded to Other operating revenue as customers use the lounge passes. Bag fees and seat upgrades are recorded to Passenger revenue at the time of the associated travel.

The fair value of the separately identifiable performance obligations is determined using management's estimated selling price of each component. The objective of using the estimated selling price based methodology is to determine the price at which we would transact a sale if the product or service were sold on a stand-alone basis. Accordingly, we determine our best estimate of selling price by considering multiple inputs and methods including, but not limited to, discounted cash flows, brand value, volume discounts, published selling prices, number of miles awarded and number of miles redeemed. The Company estimated the selling prices and volumes over the term of the co-brand agreement in order to determine the allocation of proceeds to each of the components to be delivered. We also evaluate volumes on an annual basis, which may result in a change in the allocation of the estimated consideration from the co-brand agreement on a prospective basis.

Frequent flyer deferred revenue. Miles in MileagePlus members' accounts are combined into one homogeneous pool and are thus not separately identifiable, for award redemption purposes, between miles earned in the current period and those in their beginning balance. Of the miles expected to be redeemed, the Company expects the majority of these miles to be redeemed within two years. The table below presents a roll forward of Frequent flyer deferred revenue (in millions):



	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
Total Frequent flyer deferred revenue - beginning balance	$	4,937		$	4,940		$	4,783		$	4,889
Total miles awarded	607			531			1,210			1,019
Travel miles redeemed (Passenger revenue)	(519		)	(535		)	(928		)	(933		)
Non-travel miles redeemed (Other operating revenue)	(36		)	(45		)	(76		)	(84		)
Total Frequent flyer deferred revenue - ending balance	$	4,989		$	4,891		$	4,989		$	4,891

In the three and six months ended June 30, 2018, the Company recognized, in Other operating revenue, $480 million and $974 million, respectively, related to the marketing, advertising, non-travel miles redeemed (net of related costs) and other travel-related benefits of the mileage revenue associated with our various partner agreements including, but not limited to, our Chase co-brand agreement. The portion related to the MileagePlus miles awarded of the total amounts received is deferred and presented in the table above as an increase to the frequent flyer liability. The Company recognized $459 million and $873 million, respectively, in the three and six months ended June 30, 2017, related to those revenues.

Passenger Revenue by Geography. The Company further disaggregates passenger revenue by geographic regions and by mainline versus regional. The following table presents passenger revenue by geographic region and by mainline versus regional for the three and six months ended June 30 (in millions):



	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Mainline	$	4,395	$	4,043	$	7,881	$	7,315
Regional	1,786		1,615		3,269		2,994
Domestic	6,181		5,658		11,150		10,309

Atlantic	1,824		1,615		3,076		2,732
Pacific	1,103		1,064		2,172		2,117
Latin America	772		814		1,632		1,646
International	3,699		3,493		6,880		6,495

Consolidated	$	9,880	$	9,151	$	18,030	$	16,804

Mainline	8,045		7,492		14,661		13,719
Regional	1,835		1,659		3,369		3,085
Consolidated	$	9,880	$	9,151	$	18,030	$	16,804

Ancillary Fees. The Company charges fees, separately from ticket sales, for certain ancillary services that are directly related to passengers' travel, such as ticket change fees, baggage fees, inflight amenities fees, and other ticket-related fees. These ancillary fees are part of the travel performance obligation and, as such, are recognized as passenger revenue when the travel occurs. The Company recorded $555 million and $1,052 million of ancillary fees within passenger revenue in the three and six months ended June 30, 2018, respectively, and recorded $524 million and $1,002 million of such fees in the three and six months ended June 30, 2017, respectively.

Earnings Per Share

6 Months Ended

Jun. 30, 2018

Earnings Per Share [Abstract]

Earnings Per Share

EARNINGS PER SHARE

The computations of UAL's basic and diluted earnings per share are set forth below (in millions, except per share amounts):



	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Earnings available to common stockholders	$	684	$	821	$	831	$	920

Basic weighted-average shares outstanding	274.7		306.9		279.3		310.3
Effect of employee stock awards	0.9		0.8		0.9		0.8
Diluted weighted-average shares outstanding	275.6		307.7		280.2		311.1

Earnings per share, basic	$	2.49	$	2.67	$	2.97	$	2.96
Earnings per share, diluted	$	2.48	$	2.67	$	2.96	$	2.96

The number of potentially dilutive securities excluded from the computation of diluted earnings per share amounts was not material.

In the three and six months ended June 30, 2018, UAL repurchased approximately 5.9 million and 14.3 million shares, respectively, of UAL common stock in open market transactions for $0.4 billion and $1.0 billion, respectively. As of June 30, 2018, the Company had approximately $2.0 billion remaining to purchase shares under its share repurchase program. UAL may repurchase shares through the open market, privately negotiated transactions, block trades or accelerated share repurchase transactions from time to time in accordance with applicable securities laws. UAL will repurchase shares of UAL common stock subject to prevailing market conditions, and may discontinue such repurchases at any time. See Part II, Item 2, Unregistered Sales of Equity Securities and Use of Proceeds of this report for additional information.

Accumulated Other Comprehensive Income (Loss)

6 Months Ended

Jun. 30, 2018

Equity [Abstract]

Accumulated Other Comprehensive Income (Loss)

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)

The tables below present the components of the Company's accumulated other comprehensive income (loss), net of tax ("AOCI") (in millions):



UAL	Pension and Other Postretirement Liabilities			Investments and Other			Income Taxes			Total
UAL	Pension and Other Postretirement Liabilities			Investments and Other			Income Taxes			Total
Balance at March 31, 2018	$	(1,063	)	$	(3	)	$	(48	)	$	(1,114	)
Changes in value	1			1			—			2
Amounts reclassified to earnings	14			—			(4		)	10
Net change	15			1			(4		)	12
Balance at June 30, 2018	$	(1,048	)	$	(2	)	$	(52	)	$	(1,102	)
Balance at December 31, 2017	$	(1,102	)	$	(6	)	$	(39	)	$	(1,147	)
Changes in value	24			(3		)	(6		)	15
Amounts reclassified to earnings	30			—			(7		)	23
Amounts reclassified to retained earnings	—			7			—			7
Net change	54			4			(13		)	45
Balance at June 30, 2018	$	(1,048	)	$	(2	)	$	(52	)	$	(1,102	)

Balance at March 31, 2017	$	(867	)	$	1		$	30		$	(836	)
Changes in value	(7		)	(17		)	8			(16		)
Amounts reclassified to earnings	14			—			(6		)	8
Net change	7			(17		)	2			(8		)
Balance at June 30, 2017	$	(860	)	$	(16	)	$	32		$	(844	)
Balance at December 31, 2016	$	(854	)	$	(1	)	$	26		$	(829	)
Changes in value	(33		)	(17		)	18			(32		)
Amounts reclassified to earnings	27			2			(12		)	17
Net change	(6		)	(15		)	6			(15		)
Balance at June 30, 2017	$	(860	)	$	(16	)	$	32		$	(844	)



Details for AOCI Components Reclassified to Income	Three Months Ended June 30,				Six Months Ended June 30,				Affected Line Item in the Statements of Consolidated Operations
	2018		2017		2018		2017
Pension and other postretirement liabilities
Amortization of unrecognized losses and prior service cost (a)	$	14	$	14	$	30	$	27	Miscellaneous, net
Investments and Other
Reclassifications of losses into earnings related to fuel derivative contracts	—		—		—		2		Aircraft fuel

(a) This AOCI component is included in the computation of net periodic pension and other postretirement costs (see Note 6 to the financial statements included in this Part I, Item 1 for additional information).

Income Taxes	6 Months Ended
Income Taxes	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES The Company's effective tax rate for the three and six months ended June 30, 2018 was 20.2%, and the effective tax rate for the three and six months ended June 30, 2017 was 35.7% and 35.5%, respectively. The effective tax rate represents a blend of federal, state and foreign taxes and included the impact of certain nondeductible items. The effective tax rate for the three and six months ended June 30, 2018 also reflects the reduced federal corporate income tax rate as a result of the enactment of the Tax Cuts and Jobs Act (the "Tax Act") in December 2017 and the impact of a change in the Company's mix of domestic and foreign earnings. We continue to analyze the different aspects of the Tax Act which could potentially affect the provisional estimates that were recorded at December 31, 2017.

Employee Benefit Plans

6 Months Ended

Jun. 30, 2018

Employee Benefit Plans

EMPLOYEE BENEFIT PLANS

Defined Benefit Pension and Other Postretirement Benefit Plans. The Company's net periodic benefit cost includes the following components for the three months ended June 30 (in millions):



	Pension Benefits						Other Postretirement Benefits						Affected Line Item in the Statements of Consolidated Operations
	2018			2017			2018			2017
Service cost	$	57		$	49		$	3		$	4		Salaries and related costs
Interest cost	54			55			15			17			Miscellaneous, net
Expected return on plan assets	(73		)	(61		)	—			(1		)	Miscellaneous, net
Amortization of unrecognized (gain) loss and prior service cost (credit)	32			32			(18		)	(18		)	Miscellaneous, net
Settlement loss	—			1			—			—			Miscellaneous, net
Total	$	70		$	76		$	—		$	2

The Company's net periodic benefit cost includes the following components for the six months ended June 30 (in millions):



	Pension Benefits						Other Postretirement Benefits						Affected Line Item in the Statements of Consolidated Operations
	2018			2017			2018			2017
Service cost	$	114		$	98		$	6		$	6		Salaries and related costs
Interest cost	108			110			30			34			Miscellaneous, net
Expected return on plan assets	(146		)	(121		)	—			(1		)	Miscellaneous, net
Amortization of unrecognized (gain) loss and prior service cost (credit)	65			63			(35		)	(36		)	Miscellaneous, net
Settlement loss	—			2			—			—			Miscellaneous, net
Total	$	141		$	152		$	1		$	3

During the three and six months ended June 30, 2018, the Company contributed $47 million and $160 million to its U.S. domestic tax-qualified defined benefit pension plans, respectively.

Share-Based Compensation. In the six months ended June 30, 2018, UAL granted share-based compensation awards pursuant to the United Continental Holdings, Inc. 2017 Incentive Compensation Plan. These share-based compensation awards include 1.8 million RSUs consisting of 1.1 million time-vested RSUs and 0.7 million performance-based RSUs. The time-vested RSUs vest pro-rata, on February 28th of each year, over a three-year period from the date of grant. These RSUs are generally equity awards settled in stock for domestic employees and liability awards settled in cash for international employees. The cash payments are based on the 20-day average closing price of UAL common stock immediately prior to the vesting date. The performance-based RSUs vest based on the Company's relative improvement in pre-tax margin, as compared to a group of industry peers, for the three years ending December 31, 2020. If this performance condition is achieved, cash payments will be made after the end of the performance period based on the 20-day average closing price of UAL common stock immediately prior to the vesting date. The Company accounts for the performance-based RSUs as liability awards.

The table below presents information related to share-based compensation (in millions):



	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Share-based compensation expense	$	27	$	33	$	44	$	56

	June 30, 2018		December 31, 2017
Unrecognized share-based compensation	$	86	$	53

Financial Instruments and Fair Value Measurements

6 Months Ended

Jun. 30, 2018

Fair Value Disclosures [Abstract]

Financial Instruments and Fair Value Measurements

FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS

The table below presents disclosures about the financial assets and liabilities measured at fair value on a recurring basis in UAL's financial statements (in millions):



	June 30, 2018								December 31, 2017
	Total		Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3
Cash and cash equivalents	$	2,884	$	2,884	$	—	$	—	$	1,482	$	1,482	$	—	$	—
Short-term investments:
Corporate debt	958		—		958		—		958		—		958		—
Asset-backed securities	722		—		722		—		753		—		753		—
U.S. government and agency notes	102		—		102		—		113		—		113		—
Certificates of deposit placed through an account registry service ("CDARS")	49		—		49		—		120		—		120		—
Other fixed-income securities	170		—		170		—		188		—		188		—
Other investments measured at net asset value ("NAV")	186		—		—		—		184		—		—		—
Restricted cash	107		107		—		—		109		109		—		—
Long-term investments:
Equity securities	147		147		—		—		99		99		—		—
Enhanced equipment trust certificates ("EETC")	19		—		—		19		22		—		—		22

Available-for-sale investment maturities - The short-term investments shown in the table above are classified as available-for-sale, with the exception of investments measured at NAV. As of June 30, 2018, asset-backed securities have remaining maturities of less than one year to approximately 16 years, corporate debt securities have remaining maturities of less than one year to approximately three years and CDARS have maturities of less than one year. U.S. government and other securities have maturities of less than one year to approximately 13 years. The EETC securities mature in 2019.

Restricted cash - Restricted cash primarily includes collateral for letters of credit and collateral associated with obligations for facility leases and workers' compensation.

Equity securities - Equity securities represent United's investment in Azul. In April 2018, through a wholly-owned subsidiary, the Company invested $138 million in Azul thus increasing its preferred equity stake to approximately 8% (approximately 2% of the total capital stock of Azul). The Company recognizes changes to the fair market value of its equity investment in Azul in Miscellaneous, net in its statements of consolidated operations.

Investments presented in the table above have the same fair value as their carrying value. The table below presents the carrying values and estimated fair values of financial instruments not presented in the tables above (in millions):



	Fair Value of Debt by Fair Value Hierarchy Level
	June 30, 2018										December 31, 2017
	Carrying Amount		Fair Value								Carrying Amount		Fair Value
			Total		Level 1		Level 2		Level 3				Total		Level 1		Level 2		Level 3
Long-term debt	$	13,347	$	13,443	$	—	$	9,879	$	3,564	$	13,268	$	13,787	$	—	$	10,115	$	3,672

Fair value of the financial instruments included in the tables above was determined as follows:



Description		Fair Value Methodology
Cash and cash equivalents		The carrying amounts approximate fair value because of the short-term maturity of these assets.

Short-term investments, Equity securities, EETC and Restricted cash		Fair value is based on (a) the trading prices of the investment or similar instruments, (b) an income approach, which uses valuation techniques to convert future amounts into a single present amount based on current market expectations about those future amounts when observable trading prices are not available, or (c) broker quotes obtained by third-party valuation services.

Other investments measured at NAV		In accordance with the relevant accounting standards, certain investments that are measured at fair value using the NAV per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in the table above are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the statement of financial position. The investments measured using NAV are shares of mutual funds that invest in fixed-income instruments including bonds, debt securities, and other similar instruments issued by various U.S. and non-U.S. public- or private-sector entities. The Company can redeem its shares at any time at NAV subject to a three-day settlement period.

Long-term debt		Fair values were based on either market prices or the discounted amount of future cash flows using our current incremental rate of borrowing for similar liabilities.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Commitments and Contingencies

6 Months Ended

Jun. 30, 2018

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

COMMITMENTS AND CONTINGENCIES

Commitments. As of June 30, 2018, United had firm commitments and options to purchase aircraft from The Boeing Company ("Boeing") and Airbus S.A.S. ("Airbus") presented in the table below:



Aircraft Type		Number of Firm Commitments (a)
Airbus A350		45
Boeing 737 MAX		155
Boeing 777-300ER		1
Boeing 787		18
(a) United also has options, purchase and other rights for additional aircraft.

The aircraft listed in the table above are scheduled for delivery through 2027. To the extent the Company and the aircraft manufacturers with whom the Company has existing orders for new aircraft agree to modify the contracts governing those orders, the amount and timing of the Company's future capital commitments could change. For the remainder of 2018, the Company expects to take delivery of three Boeing 787 aircraft, four Boeing 737 MAX aircraft, one Boeing 777-300ER aircraft and three used Boeing 767-300ER aircraft. In July 2018, United entered into an agreement to purchase 25 new Embraer E175 aircraft with expected delivery dates scheduled in 2019. United also has an agreement to purchase 20 used Airbus A319 aircraft with expected delivery dates scheduled in 2020 and 2021.

The table below summarizes United's commitments as of June 30, 2018, which primarily relate to the acquisition of aircraft and related spare engines, aircraft improvements and include other capital purchase commitments. Any new firm aircraft orders, including through the exercise of purchase options and purchase rights, will increase the total future capital commitments of the Company.



	(in billions)
Last six months of 2018	$	1.7
2019	3.3
2020	3.0
2021	2.8
2022	1.8
After 2022	9.8
	$	22.4

Facility and Other Operating Leases. In March 2018, United entered into a new Airline Use and Lease Agreement at Chicago O'Hare International Airport ("Chicago O'Hare") with the City of Chicago with a lease term of approximately 15 years, effective May 12, 2018 through December 31, 2033. In the second quarter of 2018, United entered into several new ground and facility leases at Chicago O'Hare, effective May 12, 2018, for hangars, a ground equipment maintenance building, and employee parking with lease terms ranging from 15 years to 30 years.

The table below summarizes the Company's scheduled future minimum lease payments under facility operating leases having initial or remaining noncancelable lease terms of more than one year as of June 30, 2018 (in millions):



	Facility and Other Operating Leases
Last six months of 2018	$	689
2019	1,244
2020	1,338
2021	1,104
2022	966
After 2022	7,934
	$	13,275

Guarantees. As of June 30, 2018, United is the guarantor of approximately $2.0 billion in aggregate principal amount of tax-exempt special facilities revenue bonds and interest thereon. These bonds, issued by various airport municipalities, are payable solely from rentals paid under long-term agreements with the respective governing bodies. The leasing arrangements associated with approximately $1.4 billion of these obligations are accounted for as operating leases with the associated expense recorded on a straight-line basis resulting in ratable accrual of the lease obligation over the expected lease term. The leasing arrangements associated with approximately $454 million of these obligations are accounted for as capital leases. All of these bonds are due between 2019 and 2038.

As of June 30, 2018, United is the guarantor of $151 million of aircraft mortgage debt issued by one of United's regional carriers. The aircraft mortgage debt is subject to similar increased cost provisions as described above for the Company's debt, and the Company would potentially be responsible for those costs under the guarantees.

Increased Cost Provisions. In the Company's financing transactions that include loans, the Company typically agrees to reimburse lenders for any reduced returns with respect to the loans due to any change in capital requirements and, in the case of loans in which the interest rate is based on the London Interbank Offered Rate, for certain other increased costs that the lenders incur in carrying these loans as a result of any change in law, subject, in most cases, to obligations of the lenders to take certain limited steps to mitigate the requirement for, or the amount of, such increased costs. At June 30, 2018, the Company had $3.3 billion of floating rate debt and $44 million of fixed rate debt with remaining terms of up to 11 years that are subject to these increased cost provisions. In several financing transactions involving loans or leases from non-U.S. entities, with remaining terms of up to 11 years and an aggregate balance of $3.2 billion, the Company bears the risk of any change in tax laws that would subject loan or lease payments thereunder to non-U.S. entities to withholding taxes, subject to customary exclusions.

Labor Negotiations. As of June 30, 2018, United had approximately 91,400 employees, of whom approximately 80% were represented by various U.S. labor organizations. UNITE HERE is attempting to organize United's Catering Operations employees, who are currently unrepresented, and filed an application to do so with the National Mediation Board on January 24, 2018.

Debt

6 Months Ended

Jun. 30, 2018

Debt Disclosure [Abstract]

Debt

DEBT

As of June 30, 2018, a substantial portion of the Company's assets, principally aircraft, certain route authorities and airport slots, was pledged under various loan and other agreements. As of June 30, 2018, UAL and United were in compliance with their respective debt covenants. In May 2018, the Company's Amended and Restated Credit and Guaranty Agreement (as amended, the "2017 Credit Agreement") was amended to reduce the interest rate on the term loan by 0.25%. As of June 30, 2018, United had its entire capacity of $2.0 billion available under the revolving credit facility of the 2017 Credit Agreement.

EETCs. In February and May 2018, United created three new EETC pass-through trusts, each of which issued pass-through certificates. The proceeds of the issuance of the pass-through certificates are used to purchase equipment notes issued by United and secured by its aircraft. The Company records the debt obligation upon issuance of the equipment notes rather than upon the initial issuance of the pass-through certificates. The pass-through certificates represent fractional undivided interests in the respective pass-through trusts and are not obligations of United. The payment obligations under the equipment notes are those of United. Proceeds received from the sale of pass-through certificates are initially held by a depositary in escrow for the benefit of the certificate holders until United issues equipment notes to the trust, which purchases such notes with a portion of the escrowed funds. These escrowed funds are not guaranteed by United and are not reported as debt on our consolidated balance sheet because the proceeds held by the depositary are not United's assets. Certain details of the pass-through trusts with proceeds received from issuance of debt in 2018 are as follows (in millions, except stated interest rate):



EETC Date	Class	Principal		Final expected distribution date	Stated interest rate	Total proceeds received from issuance of debt during 2018 and recorded as debt as of June 30, 2018
February 2018	AA	$	677	March 2030	3.50%	$	677
February 2018	A	258		March 2030	3.70%	258
May 2018	B	226		March 2026	4.60%	226
		$	1,161			$	1,161

The table below presents the Company's contractual principal payments (not including debt discount or debt issuance costs) at June 30, 2018 under then-outstanding long-term debt agreements (in millions):



Last six months of 2018	$	394
2019	1,244
2020	1,242
2021	1,230
2022	1,565
After 2022	7,838
	$	13,513

Special Charges

6 Months Ended

Jun. 30, 2018

Other Income and Expenses [Abstract]

Special Charges

SPECIAL CHARGES

For the three and six months ended June 30, special charges consisted of the following (in millions):



	Three Months Ended June 30,						Six Months Ended June 30,
Operating:	2018			2017			2018			2017
Impairment of assets	$	111		$	—		$	134		$	—
Severance and benefit costs	11			41			25			78
(Gains) losses on sale of assets and other special charges	7			3			10			17
Special charges	129			44			169			95
Income tax benefit related to special charges	(29		)	(16		)	(38		)	(34		)
Total special charges, net of tax	$	100		$	28		$	131		$	61

In May 2018, the Brazil–United States open skies agreement was ratified, which provides air carriers with unrestricted access between the United States and Brazil. The Company determined that the approval of the open skies agreement impaired the entire value of its Brazil route authorities because the agreement removes all limitations or reciprocity requirements for flights between the United States and Brazil. Accordingly, the Company recorded a $105 million special charge ($82 million net of taxes) to write off the entire value of the intangible asset associated with its Brazil routes. This asset is not part of any collateral pledged against any of the Company's borrowings. The Company continues to maintain its slot assets related to Brazil since airport access is still restricted by slot allocations that are limited by airport facility constraints. For the three and six months ended June 30, 2018, the Company also recorded $6 million ($5 million net of taxes) and $29 million ($22 million net of taxes), respectively, of fair value adjustments related to aircraft purchased off lease and other impairments related to certain fleet types and international slots no longer in use.

During the three and six months ended June 30, 2018, the Company recorded severance and benefit costs related to a voluntary early-out program for its technicians and related employees represented by the International Brotherhood of Teamsters of $6 million ($4 million net of taxes) and $14 million ($11 million net of taxes), respectively. In the first quarter of 2017, approximately 1,000 technicians and related employees elected to voluntarily separate from the Company and will receive a severance payment, with a maximum value of $100,000 per participant, based on years of service, with retirement dates through 2018. Also during the three and six months ended June 30, 2018, the Company recorded other management severance of $5 million ($4 million net of taxes) and $11 million ($8 million net of taxes), respectively.

During the three and six months ended June 30, 2017, the Company recorded $36 million ($23 million net of taxes) and $57 million ($37 million net of taxes), respectively, of severance and benefit costs related to the voluntary early-out program for its technicians and related employees, and $5 million ($3 million net of taxes) and $21 million ($13 million net of taxes), respectively, of management severance.

During the three and six months ended June 30, 2018, the Company recorded $7 million ($5 million net of taxes) and $10 million ($8 million net of taxes), respectively, of other special charges related primarily to contract termination of regional aircraft operations in Guam.

Accrual Activity

The severance-related accrual as of June 30, 2018 is primarily related to severance and other compensation expense associated with voluntary employee early retirement programs and is expected to be mostly paid in the second half of 2018. The accrual balance for future lease payments on permanently grounded aircraft as of June 30, 2018 is expected to be mostly paid through 2025. Activity related to these accruals is as follows (in millions):



	Severance and Benefits			Permanently Grounded Aircraft
Balance at December 31, 2017	$	37		$	22
Accrual	25			—
Payments	(34		)	(2		)
Balance at June 30, 2018	$	28		$	20



	Severance and Benefits			Permanently Grounded Aircraft
Balance at December 31, 2016	$	14		$	41
Accrual	78			—
Payments	(65		)	(12		)
Balance at June 30, 2017	$	27		$	29

Recently Issued Accounting Standards (Tables)

6 Months Ended

Jun. 30, 2018

New Accounting Pronouncements and Changes in Accounting Principles [Abstract]

Schedule of Adoption of Accounting Standards and Expected Impact on Financial Statements

The table below presents the impact of the adoption of the New Revenue Standard and the New Retirement Standard on select accounts and captions of the statement of consolidated operations for the three months ended June 30, 2017 (in millions, except per share amounts):



	Three Months Ended June 30, 2017
	As Previously Reported			New Revenue Standard Adjustments			New Retirement Standard Adjustments			As Adjusted
Passenger revenue	$	8,622		$	529		$	—		$	9,151
Cargo	254			19			—			273
Other operating revenue	1,124			(540		)	—			584
Total operating revenue	10,000			8			—			10,008

Salaries and related costs	2,868			—			(26		)	2,842
Distribution expenses	362			23			—			385
Other operating expenses	1,408			(27		)	—			1,381
Total operating expenses	8,601			(4		)	(26		)	8,571

Operating income	1,399			12			26			1,437

Interest expense	(158		)	(9		)	—			(167		)
Miscellaneous, net	(1		)	—			(26		)	(27		)
Total nonoperating expense, net	(125		)	(9		)	(26		)	(160		)

Income before income taxes	1,274			3			—			1,277
Income tax expense	456			—			—			456
Net income	818			3			—			821

Earnings per share, basic	2.67			—			—			2.67
Earnings per share, diluted	2.66			0.01			—			2.67



	Six Months Ended June 30, 2017
	As Previously Reported			New Revenue Standard Adjustments			New Retirement Standard Adjustments			As Adjusted
Passenger revenue	$	15,796		$	1,008		$	—		$	16,804
Cargo	474			37			—			511
Other operating revenue	2,150			(1,031		)	—			1,119
Total operating revenue	18,420			14			—			18,434

Salaries and related costs	5,529			—			(51		)	5,478
Distribution expenses	669			35			—			704
Other operating expenses	2,740			(50		)	—			2,690
Total operating expenses	16,743			(15		)	(51		)	16,677

Operating income	1,677			29			51			1,757

Interest expense	(308		)	(21		)	—			(329		)
Miscellaneous, net	(18		)	—			(51		)	(69		)
Total nonoperating expense, net	(258		)	(21		)	(51		)	(330		)

Income before income taxes	1,419			8			—			1,427
Income tax expense	505			2			—			507
Net income	914			6			—			920

Earnings per share, basic	2.95			0.01			—			2.96
Earnings per share, diluted	2.94			0.02			—			2.96

The table below presents the impact of the adoption of the New Revenue Standard on UAL's balance sheet accounts and captions as of December 31, 2017 (in millions):



	At December 31, 2017
	As Previously Reported		New Revenue Standard Adjustments		As Adjusted
Prepaid expenses and other	$	1,051	$	20	$	1,071
Total current assets	7,113		20		7,133
Total assets	42,326		20		42,346



Advance ticket sales	3,876	64		3,940
Frequent flyer deferred revenue	2,176	16		2,192
Other	569	7		576
Total current liabilities	12,676	87		12,763

Frequent flyer deferred revenue - long-term	2,565	26		2,591
Deferred income taxes	225	(21	)	204
Total other liabilities and deferred credits	8,145	5		8,150

Retained earnings	4,621	(72	)	4,549
Total stockholders' equity	8,806	(72	)	8,734
Total liabilities and stockholders' equity	42,326	20		42,346

Revenue (Tables)

6 Months Ended

Jun. 30, 2018

Revenue from Contract with Customer [Abstract]

Summary of Roll Forward of Frequent Flyer Deferred Revenue

The table below presents a roll forward of Frequent flyer deferred revenue (in millions):



	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
Total Frequent flyer deferred revenue - beginning balance	$	4,937		$	4,940		$	4,783		$	4,889
Total miles awarded	607			531			1,210			1,019
Travel miles redeemed (Passenger revenue)	(519		)	(535		)	(928		)	(933		)
Non-travel miles redeemed (Other operating revenue)	(36		)	(45		)	(76		)	(84		)
Total Frequent flyer deferred revenue - ending balance	$	4,989		$	4,891		$	4,989		$	4,891

Summary of Passenger Revenue by Geographic Region and by Mainline Versus Regional

The following table presents passenger revenue by geographic region and by mainline versus regional for the three and six months ended June 30 (in millions):



	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Mainline	$	4,395	$	4,043	$	7,881	$	7,315
Regional	1,786		1,615		3,269		2,994
Domestic	6,181		5,658		11,150		10,309

Atlantic	1,824		1,615		3,076		2,732
Pacific	1,103		1,064		2,172		2,117
Latin America	772		814		1,632		1,646
International	3,699		3,493		6,880		6,495

Consolidated	$	9,880	$	9,151	$	18,030	$	16,804

Mainline	8,045		7,492		14,661		13,719
Regional	1,835		1,659		3,369		3,085
Consolidated	$	9,880	$	9,151	$	18,030	$	16,804

Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2018

Earnings Per Share [Abstract]

Computation of Earnings Per Share

The computations of UAL's basic and diluted earnings per share are set forth below (in millions, except per share amounts):



	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Earnings available to common stockholders	$	684	$	821	$	831	$	920

Basic weighted-average shares outstanding	274.7		306.9		279.3		310.3
Effect of employee stock awards	0.9		0.8		0.9		0.8
Diluted weighted-average shares outstanding	275.6		307.7		280.2		311.1

Earnings per share, basic	$	2.49	$	2.67	$	2.97	$	2.96
Earnings per share, diluted	$	2.48	$	2.67	$	2.96	$	2.96

Accumulated Other Comprehensive Income (Loss) (Tables)

6 Months Ended

Jun. 30, 2018

Equity [Abstract]

Components of Accumulated Other Comprehensive Income, Net of Tax

The tables below present the components of the Company's accumulated other comprehensive income (loss), net of tax ("AOCI") (in millions):



UAL	Pension and Other Postretirement Liabilities			Investments and Other			Income Taxes			Total
UAL	Pension and Other Postretirement Liabilities			Investments and Other			Income Taxes			Total
Balance at March 31, 2018	$	(1,063	)	$	(3	)	$	(48	)	$	(1,114	)
Changes in value	1			1			—			2
Amounts reclassified to earnings	14			—			(4		)	10
Net change	15			1			(4		)	12
Balance at June 30, 2018	$	(1,048	)	$	(2	)	$	(52	)	$	(1,102	)
Balance at December 31, 2017	$	(1,102	)	$	(6	)	$	(39	)	$	(1,147	)
Changes in value	24			(3		)	(6		)	15
Amounts reclassified to earnings	30			—			(7		)	23
Amounts reclassified to retained earnings	—			7			—			7
Net change	54			4			(13		)	45
Balance at June 30, 2018	$	(1,048	)	$	(2	)	$	(52	)	$	(1,102	)

Balance at March 31, 2017	$	(867	)	$	1		$	30		$	(836	)
Changes in value	(7		)	(17		)	8			(16		)
Amounts reclassified to earnings	14			—			(6		)	8
Net change	7			(17		)	2			(8		)
Balance at June 30, 2017	$	(860	)	$	(16	)	$	32		$	(844	)
Balance at December 31, 2016	$	(854	)	$	(1	)	$	26		$	(829	)
Changes in value	(33		)	(17		)	18			(32		)
Amounts reclassified to earnings	27			2			(12		)	17
Net change	(6		)	(15		)	6			(15		)
Balance at June 30, 2017	$	(860	)	$	(16	)	$	32		$	(844	)



Details for AOCI Components Reclassified to Income	Three Months Ended June 30,				Six Months Ended June 30,				Affected Line Item in the Statements of Consolidated Operations
	2018		2017		2018		2017
Pension and other postretirement liabilities
Amortization of unrecognized losses and prior service cost (a)	$	14	$	14	$	30	$	27	Miscellaneous, net
Investments and Other
Reclassifications of losses into earnings related to fuel derivative contracts	—		—		—		2		Aircraft fuel

Employee Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2018

Components of Net Periodic Benefit Cost

The Company's net periodic benefit cost includes the following components for the three months ended June 30 (in millions):



	Pension Benefits						Other Postretirement Benefits						Affected Line Item in the Statements of Consolidated Operations
	2018			2017			2018			2017
Service cost	$	57		$	49		$	3		$	4		Salaries and related costs
Interest cost	54			55			15			17			Miscellaneous, net
Expected return on plan assets	(73		)	(61		)	—			(1		)	Miscellaneous, net
Amortization of unrecognized (gain) loss and prior service cost (credit)	32			32			(18		)	(18		)	Miscellaneous, net
Settlement loss	—			1			—			—			Miscellaneous, net
Total	$	70		$	76		$	—		$	2

The Company's net periodic benefit cost includes the following components for the six months ended June 30 (in millions):



	Pension Benefits						Other Postretirement Benefits						Affected Line Item in the Statements of Consolidated Operations
	2018			2017			2018			2017
Service cost	$	114		$	98		$	6		$	6		Salaries and related costs
Interest cost	108			110			30			34			Miscellaneous, net
Expected return on plan assets	(146		)	(121		)	—			(1		)	Miscellaneous, net
Amortization of unrecognized (gain) loss and prior service cost (credit)	65			63			(35		)	(36		)	Miscellaneous, net
Settlement loss	—			2			—			—			Miscellaneous, net
Total	$	141		$	152		$	1		$	3

Share-Based Compensation Expense

The table below presents information related to share-based compensation (in millions):



	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Share-based compensation expense	$	27	$	33	$	44	$	56

	June 30, 2018		December 31, 2017
Unrecognized share-based compensation	$	86	$	53

Financial Instruments and Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2018

Fair Value Disclosures [Abstract]

Financial Assets and Liabilities Measured at Fair Value on Recurring Basis

The table below presents disclosures about the financial assets and liabilities measured at fair value on a recurring basis in UAL's financial statements (in millions):



	June 30, 2018								December 31, 2017
	Total		Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3
Cash and cash equivalents	$	2,884	$	2,884	$	—	$	—	$	1,482	$	1,482	$	—	$	—
Short-term investments:
Corporate debt	958		—		958		—		958		—		958		—
Asset-backed securities	722		—		722		—		753		—		753		—
U.S. government and agency notes	102		—		102		—		113		—		113		—
Certificates of deposit placed through an account registry service ("CDARS")	49		—		49		—		120		—		120		—
Other fixed-income securities	170		—		170		—		188		—		188		—
Other investments measured at net asset value ("NAV")	186		—		—		—		184		—		—		—
Restricted cash	107		107		—		—		109		109		—		—
Long-term investments:
Equity securities	147		147		—		—		99		99		—		—
Enhanced equipment trust certificates ("EETC")	19		—		—		19		22		—		—		22

Carrying Values and Estimated Fair Values of Financial Instruments

The table below presents the carrying values and estimated fair values of financial instruments not presented in the tables above (in millions):



	Fair Value of Debt by Fair Value Hierarchy Level
	June 30, 2018										December 31, 2017
	Carrying Amount		Fair Value								Carrying Amount		Fair Value
			Total		Level 1		Level 2		Level 3				Total		Level 1		Level 2		Level 3
Long-term debt	$	13,347	$	13,443	$	—	$	9,879	$	3,564	$	13,268	$	13,787	$	—	$	10,115	$	3,672

Fair value of the financial instruments included in the tables above was determined as follows:



Description		Fair Value Methodology
Cash and cash equivalents		The carrying amounts approximate fair value because of the short-term maturity of these assets.

Short-term investments, Equity securities, EETC and Restricted cash		Fair value is based on (a) the trading prices of the investment or similar instruments, (b) an income approach, which uses valuation techniques to convert future amounts into a single present amount based on current market expectations about those future amounts when observable trading prices are not available, or (c) broker quotes obtained by third-party valuation services.

Other investments measured at NAV		In accordance with the relevant accounting standards, certain investments that are measured at fair value using the NAV per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in the table above are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the statement of financial position. The investments measured using NAV are shares of mutual funds that invest in fixed-income instruments including bonds, debt securities, and other similar instruments issued by various U.S. and non-U.S. public- or private-sector entities. The Company can redeem its shares at any time at NAV subject to a three-day settlement period.

Long-term debt		Fair values were based on either market prices or the discounted amount of future cash flows using our current incremental rate of borrowing for similar liabilities.

Commitments and Contingencies (Tables)

6 Months Ended

Jun. 30, 2018

Commitments and Contingencies Disclosure [Abstract]

Schedule of Purchase Commitments



	(in billions)
Last six months of 2018	$	1.7
2019	3.3
2020	3.0
2021	2.8
2022	1.8
After 2022	9.8
	$	22.4

As of June 30, 2018, United had firm commitments and options to purchase aircraft from The Boeing Company ("Boeing") and Airbus S.A.S. ("Airbus") presented in the table below:



Aircraft Type		Number of Firm Commitments (a)
Airbus A350		45
Boeing 737 MAX		155
Boeing 777-300ER		1
Boeing 787		18
(a) United also has options, purchase and other rights for additional aircraft.

Future Minimum Lease Payments for Operating Leases



	Facility and Other Operating Leases
Last six months of 2018	$	689
2019	1,244
2020	1,338
2021	1,104
2022	966
After 2022	7,934
	$	13,275

Debt (Tables)

6 Months Ended

Jun. 30, 2018

Debt Disclosure [Abstract]

Details of Pass Through Trusts

Certain details of the pass-through trusts with proceeds received from issuance of debt in 2018 are as follows (in millions, except stated interest rate):



EETC Date	Class	Principal		Final expected distribution date	Stated interest rate	Total proceeds received from issuance of debt during 2018 and recorded as debt as of June 30, 2018
February 2018	AA	$	677	March 2030	3.50%	$	677
February 2018	A	258		March 2030	3.70%	258
May 2018	B	226		March 2026	4.60%	226
		$	1,161			$	1,161

Contractual Principal Payments



Last six months of 2018	$	394
2019	1,244
2020	1,242
2021	1,230
2022	1,565
After 2022	7,838
	$	13,513

Special Charges (Tables)

6 Months Ended

Jun. 30, 2018

Other Income and Expenses [Abstract]

Components of Special charges

For the three and six months ended June 30, special charges consisted of the following (in millions):



	Three Months Ended June 30,						Six Months Ended June 30,
Operating:	2018			2017			2018			2017
Impairment of assets	$	111		$	—		$	134		$	—
Severance and benefit costs	11			41			25			78
(Gains) losses on sale of assets and other special charges	7			3			10			17
Special charges	129			44			169			95
Income tax benefit related to special charges	(29		)	(16		)	(38		)	(34		)
Total special charges, net of tax	$	100		$	28		$	131		$	61

Accrual Activity

Activity related to these accruals is as follows (in millions):



	Severance and Benefits			Permanently Grounded Aircraft
Balance at December 31, 2017	$	37		$	22
Accrual	25			—
Payments	(34		)	(2		)
Balance at June 30, 2018	$	28		$	20



	Severance and Benefits			Permanently Grounded Aircraft
Balance at December 31, 2016	$	14		$	41
Accrual	78			—
Payments	(65		)	(12		)
Balance at June 30, 2017	$	27		$	29

Recently Issued Accounting Standards - Schedule of Adoption of ASC 606 and Expected Impact (Statement of Operations) (Details) - USD ($)
$ / shares in Units, $ in Millions

3 Months Ended

6 Months Ended

Jun. 30, 2018

Jun. 30, 2017

Jun. 30, 2018

Jun. 30, 2017

New Accounting Pronouncements or Change in Accounting Principle [Line Items]

$ 9,880

$ 9,151

^[1]

$ 18,030

$ 16,804

^[1]

314

273

^[1]

607

511

^[1]

583

584

^[1]

1,172

1,119

^[1]

10,777

10,008

^[1]

19,809

18,434

^[1]

2,878

2,842

^[1]

5,604

5,478

^[1]

393

385

^[1]

735

704

^[1]

1,428

1,381

^[1]

2,826

2,690

^[1]

9,616

8,571

^[1]

18,372

16,677

^[1]

1,161

1,437

^[1]

1,437

1,757

^[1]

(177)

(167)

^[1]

(353)

(329)

^[1]

(166)

(27)

^[1]

(118)

(69)

^[1]

(304)

(160)

^[1]

(396)

(330)

^[1]

857

1,277

^[1]

1,041

1,427

^[1]

173

456

^[1]

210

507

^[1]

$ 684

$ 821

^[1],[2]

$ 831

$ 920

^[1],[2]

$ 2.49

$ 2.67

^[1]

$ 2.97

$ 2.96

^[1]

New Accounting Pronouncements or Change in Accounting Principle [Line Items]

$ 2.48

$ 2.67

^[1]

$ 2.96

^[1]

As Previously Reported

$ 8,622

$ 15,796

254

474

1,124

2,150

10,000

18,420

2,868

5,529

362

669

1,408

2,740

8,601

16,743

1,399

1,677

(158)

(308)

(1)

(18)

(125)

(258)

1,274

1,419

456

505

$ 818

$ 914

$ 2.67

$ 2.95

Restatement Adjustment | Accounting Standards Update 2014-09

$ 2.66

$ 2.94

New Accounting Pronouncements or Change in Accounting Principle [Line Items]

$ 529

$ 1,008

(540)

(1,031)

(27)

(50)

(4)

(15)

(9)

(21)

(9)

(21)

$ 3

$ 6

$ 0.00

$ 0.01

Restatement Adjustment | Accounting Standards Update 2017-06

$ 0.01

$ 0.02

New Accounting Pronouncements or Change in Accounting Principle [Line Items]

$ 0

(26)

(51)

(26)

(51)

(26)

(51)

(26)

(51)

$ 0

$ 0.00

New Accounting Pronouncements or Change in Accounting Principle [Line Items]

$ 0.00

[1]	Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606) and Accounting Standards Update No. 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.
[2]	Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606) and Accounting Standards Update No. 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.

Recently Issued Accounting Standards - Schedule of Adoption of ASC 606 and Expected Impact (Consolidated Balance Sheets) (Details) - USD ($)
$ in Millions

Jun. 30, 2018

Dec. 31, 2017

$ 1,028

$ 1,071

^[1]

8,881

7,133

^[1]

44,691

42,346

^[1]

5,826

3,940

^[1]

2,206

2,192

^[1]

571

576

^[1]

Frequent flyer deferred revenue - long term

14,092

12,763

^[1]

2,783

2,591

^[1]

204

8,461

8,150

^[1]

5,367

4,549

^[1]

8,639

8,734

^[1]

New Accounting Pronouncements or Change in Accounting Principle [Line Items]

$ 44,691

42,346

^[1]

As Previously Reported

1,051

7,113

42,326

3,876

2,176

569

Frequent flyer deferred revenue - long term

12,676

2,565

225

8,145

4,621

8,806

Restatement Adjustment | Accounting Standards Update 2014-09

42,326

New Accounting Pronouncements or Change in Accounting Principle [Line Items]

Frequent flyer deferred revenue - long term

(21)

(72)

(72)

$ 20

[1]	Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.

Recently Issued Accounting Standards - Narrative (Details) $ in Millions	Jan. 01, 2018 USD ($)
Retained Earnings \| Accounting Standards Update 2016-01
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of new accounting principle	$ (7)

Revenue - Additional Information (Detail) - USD ($)
$ in Millions

3 Months Ended

6 Months Ended

Jun. 30, 2018

Jun. 30, 2017

Jun. 30, 2018

Jun. 30, 2017

Refundable tickets expiration period

1 year

Frequent flyer mileage program expiration period after member account inactivity

$ 9,880

$ 9,151

^[1]

$ 18,030

$ 16,804

^[1]

18 months

Frequent flyer mileage program period in which miles redeemed

2 years

Chase and Other Partner Agreements

583

584

^[1]

$ 1,172

1,119

^[1]

Deferred Revenue for Miles in Loyalty Program

480

459

974

873

Advance tickets expiration period

2,700

$ 2,600

$ 2,200

2,200

12 months

Deferred revenue, period to be recognized

12 months

Minimum

Frequent flyer mileage program expiration period

1 year

Maximum

Frequent flyer mileage program expiration period

8 years

Passenger Revenue

Ancillary fees

$ 555

$ 524

$ 1,052

$ 1,002

[1]

Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606) and Accounting Standards Update No. 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.

Revenue - Summary of Roll Forward of Frequent Flyer Deferred Revenue (Details) - Deferred Revenue for Miles in Loyalty Program - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Movement in Deferred Revenue [Roll Forward]
Total Frequent flyer deferred revenue - beginning balance	$ 4,937	$ 4,940	$ 4,783	$ 4,889
Total miles awarded	607	531	1,210	1,019
Travel miles redeemed (Passenger revenue)	(519)	(535)	(928)	(933)
Non-travel miles redeemed (Other operating revenue)	(36)	(45)	(76)	(84)
Total Frequent flyer deferred revenue - ending balance	$ 4,989	$ 4,891	$ 4,989	$ 4,891

Revenue - Summary of Passenger Revenue by Geographic Region and by Mainline Versus Regional (Details) - USD ($)
$ in Millions

3 Months Ended

6 Months Ended

Jun. 30, 2018

Jun. 30, 2017

Jun. 30, 2018

Jun. 30, 2017

Mainline

$ 8,045

$ 7,492

$ 14,661

$ 13,719

Regional

1,835

1,659

3,369

3,085

9,880

9,151

^[1]

18,030

16,804

^[1]

International

3,699

3,493

6,880

6,495

Domestic

Mainline

4,395

4,043

7,881

7,315

Regional

1,786

1,615

3,269

2,994

6,181

5,658

11,150

10,309

Atlantic

1,824

1,615

3,076

2,732

Pacific

1,103

1,064

2,172

2,117

Latin America

Earnings available to common stockholders

$ 772

$ 814

$ 1,632

$ 1,646

[1]

Earnings Per Share - Computation of Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions

3 Months Ended

6 Months Ended

Jun. 30, 2018

Jun. 30, 2017

Jun. 30, 2018

Jun. 30, 2017

Earnings Per Share [Abstract]

$ 684

$ 821

$ 831

$ 920

Basic weighted-average shares outstanding (in shares)

274.7

306.9

279.3

310.3

Effect of employee stock awards (in shares)

0.9

0.8

0.9

0.8

Diluted weighted-average shares outstanding (in shares)

275.6

307.7

280.2

311.1

$ 2.49

$ 2.67

^[1]

$ 2.97

$ 2.96

^[1]

AOCI Attributable To Parent, Tax [Roll Forward]

$ 2.48

$ 2.67

^[1]

$ 2.96

^[1]

[1]

Earnings Per Share - Additional Information (Detail) shares in Millions, $ in Billions	3 Months Ended	6 Months Ended
	Jun. 30, 2018 USD ($) shares	Jun. 30, 2018 USD ($) shares
Earnings Loss Per Share [Line Items]
Amount remaining under repurchase programs	$ 2.0	$ 2.0
Open Market Repurchase Program
Earnings Loss Per Share [Line Items]
Number of shares repurchased \| shares	5.9	14.3
Repurchases of common stock	$ 0.4	$ 1.0

Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income, Net of Tax (Details) - USD ($)
$ in Millions

3 Months Ended

6 Months Ended

Jun. 30, 2018

Jun. 30, 2017

Jun. 30, 2018

Jun. 30, 2017

Beginning Balance, income taxes

$ (48)

$ 30

$ (39)

$ 26

Changes in value, income taxes

(6)

Amounts reclassified to earnings, income taxes

(4)

(6)

(7)

(12)

Amounts reclassified to retained earnings, income taxes

Net change, income taxes

(4)

(13)

Ending Balance, income taxes

(52)

AOCI Attributable to Parent, Net of Tax [Roll Forward]

Beginning Balance, net of tax

^[1]

8,734

Ending Balance, net of tax

(8)

^[2]

(15)

^[2]

8,639

Pension and Other Postretirement Liabilities

AOCI Attributable To Parent, Before Tax [Roll Forward]

Beginning Balance, before tax

(1,063)

(867)

(1,102)

(854)

Changes in value, before tax

(7)

(33)

Amounts reclassified to earnings, before tax

Amounts reclassified to retained earnings, before tax

Net change, before tax

(6)

Ending Balance, before tax

(1,048)

(860)

(1,048)

(860)

Investments and Other

AOCI Attributable To Parent, Before Tax [Roll Forward]

Beginning Balance, before tax

(3)

(6)

(1)

Changes in value, before tax

(17)

(3)

(17)

Amounts reclassified to earnings, before tax

Amounts reclassified to retained earnings, before tax

Net change, before tax

(17)

(15)

Ending Balance, before tax

(2)

(16)

(2)

(16)

Accumulated Other Comprehensive Income (Loss)

AOCI Attributable to Parent, Net of Tax [Roll Forward]

Beginning Balance, net of tax

(1,114)

(836)

(1,147)

(829)

Changes in value, net of tax

(16)

(32)

Amounts reclassified to earnings, net of tax

Amounts reclassified to retained earnings, net of tax