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Derivative Instruments (Narrative) (Detail) (USD $)
Sep. 30, 2012
Dec. 31, 2011
Derivative [Line Items]    
Maximum amount of future guarantee payments $ 53,100,000,000  
Insured derivatives ceded under reinsurance agreements 393,000,000  
Derivative assets, after counterparty netting 12,000,000 459,000,000
Other Assets and Derivative Assets - VIEs, after counterparty netting and embedded reclass 4,000,000 452,000,000
Derivative liabilities, after counterparty netting 3,500,000,000 6,000,000,000
Fair value of derivative assets, before counterparty netting 108,000,000 552,000,000
Derivative liabilities, before counterparty netting and posting of cash collateral 3,900,000,000 6,108,000,000
Cash collateral posted derivative counterparties 298,000,000  
Fair value of securities, posted to derivative counterparties   470,000,000
Fair value of Credit Support Annex 3,000,000 2,000,000
Derivative Liabilities [Member]
    
Derivative [Line Items]    
Derivative liabilities, before counterparty netting and posting of cash collateral 3,853,000,000 [1] 6,108,000,000 [1]
Cash collateral posted derivative counterparties 215,000,000  
Other Liabilities [Member]
    
Derivative [Line Items]    
Cash collateral posted derivative counterparties 17,000,000  
Other Assets [Member]
    
Derivative [Line Items]    
Cash collateral posted derivative counterparties $ 66,000,000  
[1] In accordance with the accounting guidance for derivative instruments and hedging activities, the balance sheet location of the Company's embedded derivative instruments is determined by the location of the related host contract.