Other Liabilities - Summary (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Summary of other liabilities
Membership Rewards liability	$ 13,742	$ 12,789
Book overdraft balances	9,897	7,352
Deferred card and other fees, net	3,442	3,027
Employee-related liabilities	2,567	2,530
Card Member rebate and reward accruals	2,061	2,126
Income tax liability	1,275	1,651
Other	8,655	7,875
Total	41,639	37,350
Repatriation tax liability	$ 998	$ 1,012