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Derivative Instruments (Narrative) (Detail) (USD $)
 9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Derivative [Line Items]    
Maximum amount of future guarantee payments $ 26,400,000,000  
Insured derivatives ceded under reinsurance agreements 67,000,000  
Cash collateral posted to derivative counterparties 219,000,000 285,000,000
Number of credit support annexes 1 1
Fair value of Credit Support Annex 4,000,000 4,000,000
Amount of counterparty netting 53,000,000 90,000,000
Derivative assets, after counterparty netting 13,000,000 12,000,000
Other assets and other assets of consolidated VIEs, after counterparty netting and embedded reclass 4,000,000 4,000,000
Counterparty netting 53,000,000 90,000,000
Derivative liabilities, after counterparty netting and posting of cash collateral 1,400,000,000 3,100,000,000
Derivative Liabilities [Member]
    
Derivative [Line Items]    
Cash collateral posted to derivative counterparties 143,000,000 203,000,000
Embedded derivative liabilities 1,597,000,000 [1] 3,425,000,000 [1]
Other Liabilities [Member]
    
Derivative [Line Items]    
Cash collateral posted to derivative counterparties 16,000,000 16,000,000
Other Assets [Member]
    
Derivative [Line Items]    
Cash collateral posted to derivative counterparties 60,000,000 66,000,000
Medium Term Notes And Other Investments [Member]
    
Derivative [Line Items]    
Embedded derivative assets 9,000,000 8,000,000
Embedded derivative liabilities $ 16,000,000 $ 36,000,000
[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 determinedby the location of the related host contract.