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Customer Deposits (Details) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
U.S.:    
Interest-bearing $ 48,513 $ 43,279
Non-interest-bearing 356 418
Non-U.S.:    
Interest-bearing 106 115
Non-interest-bearing 326 359
Total customer deposits 49,301 44,171
Card Member Credit Balances [Member]    
U.S.:    
Non-interest-bearing 312 372
Non-U.S.:    
Non-interest-bearing $ 314 $ 347