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Customer Deposits (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
U.S.:    
Interest-bearing $ 52,316 $ 54,102
Non-interest-bearing 367 478
Non-U.S.:    
Interest-bearing 58 82
Non-interest-bearing 301 335
Total customer deposits 53,042 54,997
Card Member Credit Balances [Member]    
U.S.:    
Non-interest-bearing 331 389
Non-U.S.:    
Non-interest-bearing $ 285 $ 323