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Revenue - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Residual travel funds	9.00%		16.00%	2.00%
Remaining customer travel funds	$ 1,200
Loyalty points, redemption period (in years)	2 years
Total operating revenues	$ 4,694	$ 2,052
Chase Bank USA Agreement
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Total operating revenues	$ 486	$ 280

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Contract With Customer Liability, Air Traffic Liability, Loyalty Program, Customer Funds Expiring

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