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Revenue - Passenger Revenue Breakout (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Disaggregation of Revenue [Line Items]
Operating revenue	$ 6,220	$ 4,679	$ 17,642	$ 10,739
Passenger
Disaggregation of Revenue [Line Items]
Operating revenue	5,613	4,227	15,867	9,508
Passenger non-loyalty
Disaggregation of Revenue [Line Items]
Operating revenue	4,630	3,443	13,112	7,672
Passenger loyalty - air transportation
Disaggregation of Revenue [Line Items]
Operating revenue	791	621	2,236	1,448
Passenger ancillary sold separately
Disaggregation of Revenue [Line Items]
Operating revenue	$ 192	$ 163	$ 519	$ 388

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