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Accounts Payable and Other Liabilities (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Components of Accounts Payable and Other Liabilities    
Brokerage payables $ 108,398 $ 121,353
Accounts payable and other liabilities 86,842 81,542
Total 195,240 202,895
Fair Value, Measurements, Recurring [Member] | Fair value
   
Components of Accounts Payable and Other Liabilities    
Accounts payable and other liabilities $ 36 $ 51