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Customer Deposits (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
U.S.:    
Interest-bearing $ 41,295 $ 40,831
Non-interest-bearing 336 360
Non-U.S.:    
Interest-bearing 108 121
Non-interest-bearing 397 451
Total customer deposits 42,136 41,763
Card Member Credit Balances [Member]
    
U.S.:    
Non-interest-bearing 306 340
Non-U.S.:    
Non-interest-bearing $ 381 $ 437