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Customer Deposits (Details 1) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
U.S. retail deposits:    
Savings accounts - Direct $ 30,980 $ 29,023
Certificates of deposit - Direct 291 281
Certificates of deposit - Third party 11,925 13,856
Sweep accounts - Third party 9,120 10,942
Non-U.S. deposits and U.S. non-interest bearing 110 183
Card Member credit balances - U.S. and non-U.S. 616 712
Total customer deposits $ 53,042 $ 54,997