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Revenue - Passenger Revenue Breakout (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Disaggregation of Revenue [Line Items]
Total passenger revenues	$ 7,244	$ 7,354	$ 13,672	$ 13,683
Passenger
Disaggregation of Revenue [Line Items]
Total passenger revenues	6,627	6,712	12,438	12,424
Passenger non-loyalty
Disaggregation of Revenue [Line Items]
Total passenger revenues	5,448	5,544	10,214	10,224
Passenger loyalty - air transportation
Disaggregation of Revenue [Line Items]
Total passenger revenues	870	895	1,670	1,694
Passenger ancillary sold separately
Disaggregation of Revenue [Line Items]
Total passenger revenues	$ 309	$ 273	$ 554	$ 506

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