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Other Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Summary of other liabilities    
Membership Rewards liability $ 9,750 $ 8,892
Employee-related liablities 2,336 2,429
Card Member rebate and reward accruals 1,367 1,790
Income tax liability 943 1,122
Other 12,838 10,715
Total 27,234 24,948
Repatriation tax liability $ 1,012 $ 1,012