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Revenue - Passenger Revenue Breakout (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Disaggregation of Revenue [Line Items]
Operating revenue	$ 4,694	$ 2,052
Passenger
Disaggregation of Revenue [Line Items]
Operating revenue	4,135	1,712
Passenger non-loyalty
Disaggregation of Revenue [Line Items]
Operating revenue	3,364	1,354
Passenger loyalty - air transportation
Disaggregation of Revenue [Line Items]
Operating revenue	624	278
Passenger ancillary sold separately
Disaggregation of Revenue [Line Items]
Operating revenue	$ 147	$ 80

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