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Revenue - Passenger Revenue Breakout (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Operating revenue	$ 6,525	$ 6,220	$ 19,268	$ 17,642
Passenger
Disaggregation of Revenue [Line Items]
Operating revenue	5,912	5,613	17,426	15,867
Passenger non-loyalty
Disaggregation of Revenue [Line Items]
Operating revenue	4,758	4,630	14,023	13,112
Passenger loyalty - air transportation
Disaggregation of Revenue [Line Items]
Operating revenue	916	791	2,730	2,236
Passenger ancillary sold separately
Disaggregation of Revenue [Line Items]
Operating revenue	$ 238	$ 192	$ 673	$ 519

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