v2.4.0.6
Document And Entity Information (USD $)
12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2011
Feb. 16, 2012
UAL [Member]
Jun. 30, 2011
UAL [Member]
Dec. 31, 2011
United Airlines Inc [Member]
Feb. 16, 2012
United Airlines Inc [Member]
Dec. 31, 2011
Continental Airlines Inc [Member]
Feb. 16, 2012
Continental Airlines Inc [Member]
Document Type 10-K            
Amendment Flag false            
Document Period End Date Dec. 31, 2011            
Document Fiscal Year Focus 2011            
Document Fiscal Period Focus FY            
Entity Registrant Name United Continental Holdings, Inc.     United Air Lines Inc.   Continental Airlines Inc./ DE/  
Trading Symbol ual            
Entity Central Index Key 0000100517     0000101001   0000319687  
Current Fiscal Year End Date --12-31     --12-31   --12-31  
Entity Filer Category Large Accelerated Filer     Non-accelerated Filer   Non-accelerated Filer  
Entity Common Stock, Shares Outstanding   332,066,655     205   1,000
Entity Well-known Seasoned Issuer Yes            
Entity Voluntary Filers No            
Entity Current Reporting Status Yes            
Entity Public Float     $ 7,461,888,499