Frequent Flyer And Passenger Revenue Accounting	3 Months Ended
Frequent Flyer And Passenger Revenue Accounting	Mar. 31, 2012
Frequent Flyer And Passenger Revenue Accounting	NOTE 1—FREQUENT FLYER AND PASSENGER REVENUE ACCOUNTING Frequent Flyer Awards. Effective January 1, 2012, the Company updated its estimated selling price for miles to the contractual rate at which we sell miles to our Star Alliance partners participating in reciprocal frequent flyer programs. This change in estimate has been applied prospectively effective January 1, 2012. United and Continental account for miles sold and awarded that will never be redeemed by program members, which the Company refers to as "breakage," using the redemption method. UAL reviews its breakage estimates annually based upon the latest available information regarding redemption and expiration patterns. The Company re-evaluated its population breakage estimates for OnePass miles, which were previously not subject to an expiration policy, and increased the estimate of miles in the population expected to ultimately expire. The Company's estimate of the expected expiration of miles requires significant management judgment. Current and future changes to expiration assumptions, the expiration policy, program rules or program redemption opportunities may result in material changes to the deferred revenue balance as well as recognized revenues from the programs. For the three months ended March 31, 2012, the combined net impact of these changes to UAL, United and Continental were not material.
United Airlines Inc [Member]
Frequent Flyer And Passenger Revenue Accounting	NOTE 1—FREQUENT FLYER AND PASSENGER REVENUE ACCOUNTING Frequent Flyer Awards. Effective January 1, 2012, the Company updated its estimated selling price for miles to the contractual rate at which we sell miles to our Star Alliance partners participating in reciprocal frequent flyer programs. This change in estimate has been applied prospectively effective January 1, 2012. United and Continental account for miles sold and awarded that will never be redeemed by program members, which the Company refers to as "breakage," using the redemption method. UAL reviews its breakage estimates annually based upon the latest available information regarding redemption and expiration patterns. The Company re-evaluated its population breakage estimates for OnePass miles, which were previously not subject to an expiration policy, and increased the estimate of miles in the population expected to ultimately expire. The Company's estimate of the expected expiration of miles requires significant management judgment. Current and future changes to expiration assumptions, the expiration policy, program rules or program redemption opportunities may result in material changes to the deferred revenue balance as well as recognized revenues from the programs. For the three months ended March 31, 2012, the combined net impact of these changes to UAL, United and Continental were not material.
Continental Airlines Inc [Member]
Frequent Flyer And Passenger Revenue Accounting	NOTE 1—FREQUENT FLYER AND PASSENGER REVENUE ACCOUNTING Frequent Flyer Awards. Effective January 1, 2012, the Company updated its estimated selling price for miles to the contractual rate at which we sell miles to our Star Alliance partners participating in reciprocal frequent flyer programs. This change in estimate has been applied prospectively effective January 1, 2012. United and Continental account for miles sold and awarded that will never be redeemed by program members, which the Company refers to as "breakage," using the redemption method. UAL reviews its breakage estimates annually based upon the latest available information regarding redemption and expiration patterns. The Company re-evaluated its population breakage estimates for OnePass miles, which were previously not subject to an expiration policy, and increased the estimate of miles in the population expected to ultimately expire. The Company's estimate of the expected expiration of miles requires significant management judgment. Current and future changes to expiration assumptions, the expiration policy, program rules or program redemption opportunities may result in material changes to the deferred revenue balance as well as recognized revenues from the programs. For the three months ended March 31, 2012, the combined net impact of these changes to UAL, United and Continental were not material.