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Customer Deposits (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
U.S.:    
Interest-bearing $ 40,831 $ 39,649
Non-interest-bearing 360 10
Non-U.S.:    
Interest-bearing 121 135
Non-interest-bearing 451 9
Total customer deposits 41,763 39,803
Card Member Credit Balances [Member]
    
U.S.:    
Non-interest-bearing 340 0
Non-U.S.:    
Non-interest-bearing $ 437 $ 0