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Derivatives and Hedging Activities (Details 5) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Credit Risk    
Cash and cash equivalents and corresponding liability in other liabilities for collateral $ 802 $ 98
Fair market value of securities accepted as additional collateral 186 23
Maximum credit exposure related to derivative assets 72 45
Aggregate fair value of all derivative instruments containing credit risk features 112 412
Aggregate fair value of assets posted as collateral 103 406
Additional fair value of assets needed to settle these derivative liabilities $ 9 $ 6