Other Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Summary of other liabilities
Membership Rewards liability	$ 8,892	$ 8,414
Employee-related liablities	2,429	2,164
Card Member rebate and reward accruals	1,790	1,596
Income tax liability	1,122	1,079
Other	10,715	9,321
Total	24,948	22,574
Repatriation tax liability	$ 1,012	$ 1,689