Revenue - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Deferred Revenue Arrangement [Line Items]
Residual Travel Funds	22.00%		28.00%
Operating Revenue	$ 2,052	$ 4,234
Chase And Other Partner Agreements
Deferred Revenue Arrangement [Line Items]
Operating Revenue	$ 280	$ 321

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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+ Details