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Derivative Instruments (Credit Derivatives Sold) (Detail) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Credit Default Swap [Member]    
Derivative [Line Items]    
Weighted average remaining expected maturity 2 years 1 month 6 days 1 year 7 months 6 days
Insured Swaps [Member]    
Derivative [Line Items]    
Weighted average remaining expected maturity 16 years 8 months 12 days 16 years 8 months 12 days
Insurance Operations [Member]    
Derivative [Line Items]    
Derivative notional amount $ 7,146 $ 13,525
Total fair value of credit derivatives (124) (246)
Insurance Operations [Member] | Credit Default Swap [Member]    
Derivative [Line Items]    
Derivative notional amount 3,318 9,481
Total fair value of credit derivatives (121) (244)
Insurance Operations [Member] | Insured Swaps [Member]    
Derivative [Line Items]    
Derivative notional amount 3,828 4,044
Total fair value of credit derivatives (3) (2)
Insurance Operations [Member] | Other Credit Derivatives [Member]    
Derivative [Line Items]    
Derivative notional amount 0 0
Total fair value of credit derivatives 0 0
Credit Rating Aaa [Member] | Insurance Operations [Member]    
Derivative [Line Items]    
Derivative notional amount 2,018 6,914
Total fair value of credit derivatives 0 (2)
Credit Rating Aaa [Member] | Insurance Operations [Member] | Credit Default Swap [Member]    
Derivative [Line Items]    
Derivative notional amount 2,018 6,914
Credit Rating Aaa [Member] | Insurance Operations [Member] | Insured Swaps [Member]    
Derivative [Line Items]    
Derivative notional amount 0 0
Credit Rating Aaa [Member] | Insurance Operations [Member] | Other Credit Derivatives [Member]    
Derivative [Line Items]    
Derivative notional amount 0 0
Credit Rating Aa [Member] | Insurance Operations [Member]    
Derivative [Line Items]    
Derivative notional amount 111 363
Total fair value of credit derivatives 0 0
Credit Rating Aa [Member] | Insurance Operations [Member] | Credit Default Swap [Member]    
Derivative [Line Items]    
Derivative notional amount 0 246
Credit Rating Aa [Member] | Insurance Operations [Member] | Insured Swaps [Member]    
Derivative [Line Items]    
Derivative notional amount 111 117
Credit Rating Aa [Member] | Insurance Operations [Member] | Other Credit Derivatives [Member]    
Derivative [Line Items]    
Derivative notional amount 0 0
Credit Rating A [Member] | Insurance Operations [Member]    
Derivative [Line Items]    
Derivative notional amount 3,043 3,903
Total fair value of credit derivatives (3) (2)
Credit Rating A [Member] | Insurance Operations [Member] | Credit Default Swap [Member]    
Derivative [Line Items]    
Derivative notional amount 304 968
Credit Rating A [Member] | Insurance Operations [Member] | Insured Swaps [Member]    
Derivative [Line Items]    
Derivative notional amount 2,739 2,935
Credit Rating A [Member] | Insurance Operations [Member] | Other Credit Derivatives [Member]    
Derivative [Line Items]    
Derivative notional amount 0 0
Credit Rating Bbb [Member] | Insurance Operations [Member]    
Derivative [Line Items]    
Derivative notional amount 957 1,163
Total fair value of credit derivatives (2) (2)
Credit Rating Bbb [Member] | Insurance Operations [Member] | Credit Default Swap [Member]    
Derivative [Line Items]    
Derivative notional amount 0 193
Credit Rating Bbb [Member] | Insurance Operations [Member] | Insured Swaps [Member]    
Derivative [Line Items]    
Derivative notional amount 957 970
Credit Rating Bbb [Member] | Insurance Operations [Member] | Other Credit Derivatives [Member]    
Derivative [Line Items]    
Derivative notional amount 0 0
Credit Rating Below Investment Grade [Member] | Insurance Operations [Member]    
Derivative [Line Items]    
Derivative notional amount 1,017 1,182
Total fair value of credit derivatives (119) (240)
Credit Rating Below Investment Grade [Member] | Insurance Operations [Member] | Credit Default Swap [Member]    
Derivative [Line Items]    
Derivative notional amount 996 1,160
Credit Rating Below Investment Grade [Member] | Insurance Operations [Member] | Insured Swaps [Member]    
Derivative [Line Items]    
Derivative notional amount 21 22
Credit Rating Below Investment Grade [Member] | Insurance Operations [Member] | Other Credit Derivatives [Member]    
Derivative [Line Items]    
Derivative notional amount $ 0 $ 0