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Customer Deposits (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
U.S.:    
Interest-bearing $ 40,786 $ 39,649
Non-interest-bearing 174 10
Non-U.S.:    
Interest-bearing 126 135
Non-interest-bearing 215 9
Total customer deposits 41,301 39,803
Cardmember Credit Balances [Member]
    
U.S.:    
Non-interest-bearing 155  
Non-U.S.:    
Non-interest-bearing $ 206