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Derivative Instruments (Narrative) (Detail)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
Derivative [Line Items]    
Maximum amount of future guarantee payments $ 3,500  
Cash collateral posted to derivative counterparties 80 $ 12
Securities posted as collateral to derivative counterparties $ 245 $ 198
Number of credit support annexes 1 1
Fair value of Credit Support Annex $ 3 $ 2
Amount of counterparty netting 1 81
Derivative assets, after counterparty netting 15 10
Other assets and other assets of consolidated VIEs, after counterparty netting and embedded reclass 9 2
Counterparty netting 1 81
Derivative liabilities, after counterparty netting and posting of cash collateral 411 456
Derivative liabilities and derivative liabilities of consolidated VIEs, after counterparty netting and embedded reclass 396 437
Derivative Liabilities [Member]    
Derivative [Line Items]    
Cash collateral posted to derivative counterparties 61 0
Other Liabilities [Member]    
Derivative [Line Items]    
Cash collateral posted to derivative counterparties 19 12
Other Assets [Member]    
Derivative [Line Items]    
Cash collateral posted to derivative counterparties   0
Medium Term Notes And Other Investments [Member] | Embedded [Member]    
Derivative [Line Items]    
Embedded derivative assets 6 8
Total derivative liabilities $ 15 $ 19