Value of revenue deferred or cost to provide future products or services, primarily air transportation, associated with programs used by airlines to encourage passenger loyalty by providing rewards geared to the frequency of travel on the sponsoring airline, typically in the form of frequent flyer miles, points, or segments that can be accumulated and converted into free or discounted travel or other redemption options.

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Revenue Recognition (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
Revenue Recognition (Details) - USD ($) $ in Millions	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue from Contract with Customer [Abstract]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	3 years								3 years
Air Traffic Liability	$ 661				$ 580				$ 661	$ 580	$ 502
Contract with Customer, Liability, Revenue Recognized									878	823
Air Traffic Liability - Passenger Travel	929				892				929	892
Passenger Travel Revenue									7,395	7,061	6,508
Passenger Revenue - Loyalty Air Travel									391	320	253
Other Revenue - Loyalty									201	168	140
Other Revenue - Non Loyalty									107	109	111
Revenue from Contract with Customer, Excluding Assessed Tax	2,031	$ 2,086	$ 2,105	$ 1,871	1,968	$ 2,008	$ 1,928	$ 1,754	8,094	7,658	$ 7,012
Air Traffic Liability - Loyalty Program (Air Transportation)	661				580				661	580
Other Deferred Revenue	10				10				10	10
Contract with Customer, Liability	$ 1,600				$ 1,482				1,600	1,482
Increase (Decrease) to Air Traffic Liability - Points Redeemed									(391)	(320)
Increase (Decrease) to Air Traffic Liability - Points Earned									$ 472	$ 398