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Derivative Instruments (Narrative) (Detail) (USD $)
 9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Derivative [Line Items]    
Maximum amount of future guarantee payments $ 11,700,000,000  
Insured derivatives ceded under reinsurance agreements 27,000,000  
Cash collateral posted to derivative counterparties 60,000,000 160,000,000
Securities posted as collateral to derivative counterparties 123,000,000 42,000,000
Number of credit support annexes 1 1
Fair value of Credit Support Annex 4,000,000 4,000,000
Amount of counterparty netting 65,000,000 42,000,000
Derivative assets, after counterparty netting 12,000,000 13,000,000
Other assets and other assets of consolidated VIEs, after counterparty netting and embedded reclass 4,000,000 4,000,000
Counterparty netting 65,000,000 42,000,000
Derivative liabilities, after counterparty netting and posting of cash collateral 435,000,000 1,200,000,000
Derivative Liabilities [Member]
    
Derivative [Line Items]    
Cash collateral posted to derivative counterparties 44,000,000 123,000,000
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   21,000,000
Medium Term Notes And Other Investments [Member] | Embedded [Member]
    
Derivative [Line Items]    
Embedded derivative assets 8,000,000 9,000,000
Total derivative liabilities $ 23,000,000 $ 19,000,000