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Customer Deposits (Details 1) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
U.S. retail deposits:    
Savings accounts - Direct $ 29,023 $ 26,159
Certificates of deposit - Direct 281 333
Certificates of deposit - Third party 13,856 7,838
Sweep accounts - Third party 10,942 8,949
Non-U.S. deposits and U.S. non-interest bearing 183 173
Card Member credit balances - U.S. and non-U.S. 712 719
Total customer deposits $ 54,997 $ 44,171