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Revenue - Passenger Revenue Breakout (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Operating revenue	$ 6,728	$ 4,008	$ 11,422	$ 6,060
Passenger
Disaggregation of Revenue [Line Items]
Operating revenue	6,119	3,569	10,254	5,282
Passenger non-loyalty
Disaggregation of Revenue [Line Items]
Operating revenue	5,118	2,875	8,482	4,230
Passenger loyalty - air transportation
Disaggregation of Revenue [Line Items]
Operating revenue	821	549	1,445	826
Passenger ancillary sold separately
Disaggregation of Revenue [Line Items]
Operating revenue	$ 180	$ 145	$ 327	$ 226

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