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Other Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Summary of other liabilities    
Membership Rewards liability $ 7,060 $ 6,721
Employee-related liablities 2,055 2,097
Rebate and reward accruals 1,382 2,238
Deferred card and other fees, net 1,411 1,343
Book overdraft balances 2,255 409
Other 4,614 4,764
Total $ 18,777 $ 17,572