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Derivatives and Hedging Activities (Details 5) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Derivatives liabilities, credit risk related contingent features    
Aggregate fair value of all derivative instruments in a net liability position containing such credit risk features $ 364 $ 106
Aggregate fair value of assets posted as collateral 360 98
Additional fair value of assets needed to settle derivative liabilities 4 8
Derivative assets | Credit risk
   
Derivative assets, credit risk    
Cash and cash equivalents and corresponding liability in other liabilities for collateral 262 635
Fair market value of securities accepted as additional collateral 387 186
Maximum credit exposure related to derivative assets $ 29 $ 61