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Customer Deposits (Details 1) (USD $)
In Millions
Jun. 30, 2011
Dec. 31, 2010
Deposits By Type    
Other deposits $ 711 $ 674
Total customer deposits 32,291 29,727
United States [Member]
   
Deposits By Type    
Savings accounts - Direct 12,965 7,725
Certificates of deposit - Direct 926 1,052
Certificates of deposit - Third party 8,640 11,411
Sweep accounts - Third party $ 9,049 $ 8,865