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Customer Deposits (Details) (USD $)
In Millions
Jun. 30, 2011
Dec. 31, 2010
U.S.:    
Interest-bearing $ 31,580 $ 29,053
Non-interest-bearing 4 17
Non-U.S.:    
Interest-bearing 682 640
Non-interest-bearing 25 17
Total customer deposits $ 32,291 $ 29,727