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Derivative Instruments (Narrative) (Details) (USD $)
Mar. 31, 2012
Dec. 31, 2011
Derivative Instruments [Abstract]    
Maximum amount of future guarantee payments $ 65,500,000,000  
Insured derivatives ceded under reinsurance agreements 713,000,000  
Derivative assets, after counterparty netting 463,000,000 459,000,000
Derivative assets and Derivative assets - VIEs, after counterparty netting 457,000,000 452,000,000
Derivative liabilities, after counterparty netting 5,700,000,000 6,000,000,000
Fair value of derivative liabilities reported in derivative liabilities and derivative liabilities VIEs Net of Counterparty 5,600,000,000  
Fair value of derivative assets, before counterparty netting 539,000,000 552,000,000
Fair value of derivative liabilities, before counterparty netting 5,700,000,000 6,100,000,000
Fair value of securities, posted to derivative counterparties 435,000,000 470,000,000
Fair value of Credit Support Annex $ 2,000,000 $ 2,000,000