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

Revenue - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Revenue - Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Residual travel funds	17.00%		17.00%		28.00%	2.00%
Remaining customer travel funds	$ 1,400		$ 1,400
Loyalty points, redemption period (in years)			2 years
Total operating revenues	4,679	$ 1,793	$ 10,739	$ 7,035
Chase Bank USA Agreement
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Total operating revenues	$ 355	$ 282	$ 987	$ 859