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Financial Instruments (Counterparty credit risk) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Counterparty credit risk    
Exposure To Counter Parties $ 822  
Securities Held as Collateral, at Fair Value 9,970  
Fair value of collateral posted to counterparties for derivataive obligations 477  
Derivative Liability, Fair Value, Amount Offset Against Collateral 563  
Cash [Member]
   
Counterparty credit risk    
Securities Held as Collateral, at Fair Value 3,215  
Securities Held By Third Parties [Member]
   
Counterparty credit risk    
Securities Held as Collateral, at Fair Value $ 6,755 $ 10,574