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Revenue - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Flight credits (as a percent)	6.00%		6.00%		8.00%
Total operating revenues	$ 7,244	$ 7,354	$ 13,672	$ 13,683
Chase Bank USA Agreement
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Total operating revenues	$ 567	$ 556	$ 1,100	$ 1,100

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