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Customer Deposits (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
U.S.:    
Interest-bearing $ 46,334 $ 43,279
Non-interest-bearing 354 418
Non-U.S.:    
Interest-bearing 123 115
Non-interest-bearing 355 359
Total customer deposits 47,166 44,171
Card Member Credit Balances [Member]    
U.S.:    
Non-interest-bearing 314 372
Non-U.S.:    
Non-interest-bearing $ 343 $ 347