Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Trading Arrangement: Trading Arrangement [Axis] Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Statistical Measurement [Domain] Statistical Measurement [Domain] Title of 12(b) Security Title of 12(b) Security Carrying Amount Reported Value Measurement [Member] Subsequent Event Subsequent Event [Member] Document Fiscal Year Focus Document Fiscal Year Focus Miles earned Frequent Flyer Mileage Miles Awarded in Period Frequent flyer mileage miles awarded in period. Adjustment to Compensation, Amount Adjustment to Compensation Amount Aircraft rent Airline, Aircraft Rent Expense Republic Airways Republic Airways Holdings Inc. [Member] Republic Airways Holdings Inc. [Member] Common stock at par, $0.01 par value; authorized 1,000,000,000 shares; outstanding 324,583,772 and 323,470,682 shares at June 30, 2026 and December 31, 2025, respectively Common stock at par, $0.01 par value; authorized 1,000 shares; issued and outstanding 1,000 shares at both June 30, 2026 and December 31, 2025 Common Stock, Value, Issued Accrued salaries and benefits Employee-related Liabilities, Current Regional capacity purchase Airline, Capacity Purchase Arrangement Expense PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS Retirement Benefits [Text Block] Frequent flyer deferred revenue Contract With Customer, Liability, Current, Frequent Flyer Contract With Customer, Liability, Current, Frequent Flyer Passenger revenue Passenger revenue Passenger [Member] Restatement Determination Date Restatement Determination Date Proceeds from sale of short-term and other investments Proceeds from Sale, Maturity and Collection of Investments Expected return on plan assets Defined Benefit 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[Member] Mesa Airlines Inc. 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[Member] Azul Linhas Aereas Brasileiras S.A. 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Schedule of Components of Special Charges (Credits) Restructuring and Related Costs [Table Text Block] Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Equity method investments Equity Method Investments Equity Component [Domain] Equity Component [Domain] PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Secured Debt Secured Debt [Member] Total operating expense Costs and Expenses Adoption Date Trading Arrangement Adoption Date Counterparty Name [Domain] Counterparty Name [Domain] Interest rate Debt Instrument, Interest Rate, Stated Percentage Total stockholders' equity Balance beginning Balance ending Equity, Attributable to Parent Total nonoperating expense, net Nonoperating Income (Expense) Equity securities Equity Securities, FV-NI, Current ASSETS Assets [Abstract] United Airlines, Inc. United Air Lines Inc [Member] United Airlines, Inc. 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[Abstract] 2027 Unrecorded Unconditional Purchase Obligation, to be Paid, Year One Equity Awards Adjustments Equity Awards Adjustments [Member] Operating leases converted to finance leases Operating Leases Converted To Finance Leases Operating Leases Converted To Finance Leases Non-travel miles redeemed Non-Travel Miles Redemption, Frequent Flyer Deferred Revenue Non-travel miles redemption, frequent flyer deferred revenue. 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Investments Name Awards Close in Time to MNPI Disclosures, Individual Name Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Receivables, net Receivables, net Receivables, Net, Current Percentage of employees represented by various U.S. labor organizations Percentage Of Employees Represented By Labor Organizations Percentage of employees represented by labor organizations Preferred stock Preferred Stock, Value, Issued Adjustment to Compensation: Adjustment to Compensation [Axis] Advance ticket sales Contract With Customer, Liability, Current, Advance Ticket Sales Contract With Customer, Liability, Current, Advance Ticket Sales Property and equipment acquired through the issuance or modification of debt, finance leases and other financial liabilities Noncash Or Part Noncash Acquisition, Fixed Assets Acquired, Net Of Vendor Credits Noncash Or Part Noncash Acquisition, Fixed Assets Acquired, Net Of Vendor Credits Class of Stock [Domain] Class of Stock [Domain] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Capital expenditures, net of flight equipment purchase deposit returns Payments to Acquire Productive Assets Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Total borrowing commitment Other Commitment Revenue From Contract With Customer [Line Items] Revenue From Contract With Customer [Line Items] [Line Items] for Revenue From Contract With Customer [Table] [Table] 2026 Notes 4.375% Secured Notes Due 2026 [Member] 4.375% Secured Notes Due 2026 Credit Facility [Axis] Credit Facility [Axis] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Long-term debt, finance leases, and other financial liabilities Long-Term Debt and Lease Obligation Name Measure Name INCOME TAXES Income Tax Disclosure [Text Block] Accounts payable Accounts Payable, Current Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Debt Instrument [Line Items] Debt Instrument [Line Items] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Retirement Plan Type [Domain] Retirement Plan Type [Domain] Additional Capital Invested Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Short-term investments Short-Term Investments Subscribed equity investments in connection with reorganization process Equity Securities, Restructuring Agreement, Committed Investment Amount Equity Securities, Restructuring Agreement, Maximum Investment Name Trading Arrangement, Individual Name Pacific Pacific Destination [Member] Cash and cash equivalents Cash and cash equivalents Cash and Cash Equivalent Distribution expenses Selling Expense Company Selected Measure Amount Company Selected Measure Amount Depreciation and amortization Depreciation, Depletion and Amortization 2030 Unrecorded Unconditional Purchase Obligation, to be Paid, Year Four Number of employees Entity Number of Employees Secured Overnight Financing Rate (SOFR) Secured Overnight Financing Rate (SOFR) [Member] Pension and postretirement benefit liability Liability, Retirement and Postemployment Benefits Stock issued for share-based awards, net of shares withheld for tax (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Schedule of Stock by Class [Table] Stock, Class of Stock [Table] CommuteAir CommuteAir LLC [Member] CommuteAir LLC [Member] UAL And United UAL And United [Member] UAL And United [Member] Non-PEO NEO Non-PEO NEO [Member] Senior Notes Senior Notes [Member] Entity Address, Address Line One Entity Address, Address Line One Fund United Airlines Ventures Sustainable Flight Fund [Member] United Airlines Ventures Sustainable Flight Fund [Member] Right-of-use assets acquired or modified through operating leases Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Income tax expense Income Tax Expense (Benefit) Ancillary Services Passenger, Ancillary Fees [Member] Passenger - Ancillary Fees [Member] Award Timing Method Award Timing Method [Text Block] Net increase in cash, cash equivalents and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Other operating revenue Product and Service, Other [Member] Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Term Loan Credit and guaranty Agreement Term Loan Due 2024 [Member] Term Loan Due 2024 Travel miles redeemed Travel Miles Redemption, Frequent Flyer Deferred Revenue Travel miles redemption, frequent flyer deferred revenue. Amortization of unrecognized gain Defined Benefit Plan, Amortization of Gain (Loss) Aircraft fuel Fuel Costs Total AOCI Attributable to Parent, Net of Tax [Roll Forward] Net income Net income Net Income (Loss) Attributable to Parent Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Proceeds from sale of property and equipment Proceeds from Sale of Property, Plant, and Equipment Statement [Table] Statement [Table] Restatement Determination Date: Restatement Determination Date [Axis] Schedule of Components of Accumulated Other Comprehensive Income (Loss), Net of Tax Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Interest income Investment Income, Interest Schedule of Roll Forward of Frequent Flyer Deferred Revenue Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Operating revenue: Operating revenue: Revenues [Abstract] Last Six Months of 2026 Unrecorded Unconditional Purchase Obligation, to be Paid, Remainder of Fiscal Year Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block]