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Revenue - Air Traffic Liability - Loyalty Program Rollforward (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Change in Contract With Customer, Liability [Roll Forward]
Beginning balance	$ 4,841	$ 4,987	$ 4,849	$ 4,916
Amounts deferred associated with points awarded	748	901	1,565	1,794
Ending balance	4,693	4,962	4,693	4,962
Passenger Customer
Change in Contract With Customer, Liability [Roll Forward]
Revenue recognized from points redeemed	(870)	(895)	(1,670)	(1,694)
Other
Change in Contract With Customer, Liability [Roll Forward]
Revenue recognized from points redeemed	$ (26)	$ (31)	$ (51)	$ (54)