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Derivatives and Hedging Activities (Details 6) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Derivatives liabilities, credit risk related contingent features    
Aggregate fair value of all derivative instruments containing credit risk features $ 300 $ 112
Aggregate fair value of assets posted as collateral 272 103
Additional fair value of assets needed to settle these derivative liabilities 28 9
Derivative assets | Credit risk
   
Derivative assets, credit risk    
Cash and cash equivalents and corresponding liability in other liabilities for collateral (272) (802)
Fair market value of securities accepted as additional collateral 121 186
Maximum credit exposure related to derivative assets $ 23 $ 72