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Consolidations and Transfers of Financial Assets Qualifying Sales of Portfolio Securitizations (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Transfers and Servicing [Abstract]        
Proceeds from the initial sale of securities from portfolio securitizations $ 163 $ 513 $ 296 $ 621
Proceeds from portfolio securitizations accounted for as secured borrowings     421 0
Fair value of trading securities underlying the portfolio securitizations accounted for as secured borrowings 201   201  
Unpaid principal balance of mortgage loans of consolidated trusts underlying the portfolio securitizations accounted for as secured borrowings $ 227   $ 227