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Derivative Instruments (Credit Derivatives Sold) (Detail) - Insurance Operations [Member] - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Derivative [Line Items]    
Derivative notional amount $ 3,423 $ 4,043
Total fair value of credit derivatives $ (88) $ (66)
Credit Default Swap [Member]    
Derivative [Line Items]    
Weighted average remaining expected maturity 3 years 9 months 3 years 9 months
Derivative notional amount $ 530 $ 588
Total fair value of credit derivatives $ (86) $ (64)
Insured Swaps [Member]    
Derivative [Line Items]    
Weighted average remaining expected maturity 16 years 15 years 6 months
Derivative notional amount $ 2,893 $ 3,035
Total fair value of credit derivatives $ (2) $ (2)
Insured Swaps - Held for Sale [Member]    
Derivative [Line Items]    
Weighted average remaining expected maturity   14 years 3 months
Derivative notional amount $ 0 $ 420
Credit Rating Aaa [Member]    
Derivative [Line Items]    
Derivative notional amount 0 0
Total fair value of credit derivatives   0
Credit Rating Aaa [Member] | Credit Default Swap [Member]    
Derivative [Line Items]    
Derivative notional amount 0 0
Credit Rating Aaa [Member] | Insured Swaps [Member]    
Derivative [Line Items]    
Derivative notional amount   0
Credit Rating Aaa [Member] | Other Credit Derivatives [Member]    
Derivative [Line Items]    
Derivative notional amount   0
Credit Rating Aa [Member]    
Derivative [Line Items]    
Derivative notional amount 133 137
Total fair value of credit derivatives   0
Credit Rating Aa [Member] | Credit Default Swap [Member]    
Derivative [Line Items]    
Derivative notional amount   0
Credit Rating Aa [Member] | Insured Swaps [Member]    
Derivative [Line Items]    
Derivative notional amount 133 137
Credit Rating Aa [Member] | Other Credit Derivatives [Member]    
Derivative [Line Items]    
Derivative notional amount   0
Credit Rating A [Member]    
Derivative [Line Items]    
Derivative notional amount 2,124 2,261
Total fair value of credit derivatives (1) (1)
Credit Rating A [Member] | Credit Default Swap [Member]    
Derivative [Line Items]    
Derivative notional amount 115 115
Credit Rating A [Member] | Insured Swaps [Member]    
Derivative [Line Items]    
Derivative notional amount 2,009 2,146
Credit Rating A [Member] | Other Credit Derivatives [Member]    
Derivative [Line Items]    
Derivative notional amount   0
Credit Rating Bbb [Member]    
Derivative [Line Items]    
Derivative notional amount 731 1,152
Total fair value of credit derivatives (1) (1)
Credit Rating Bbb [Member] | Credit Default Swap [Member]    
Derivative [Line Items]    
Derivative notional amount   0
Credit Rating Bbb [Member] | Insured Swaps [Member]    
Derivative [Line Items]    
Derivative notional amount 731 732
Credit Rating Bbb [Member] | Insured Swaps - Held for Sale [Member]    
Derivative [Line Items]    
Derivative notional amount 0 420
Credit Rating Below Investment Grade [Member]    
Derivative [Line Items]    
Derivative notional amount 435 493
Total fair value of credit derivatives (86) (64)
Credit Rating Below Investment Grade [Member] | Credit Default Swap [Member]    
Derivative [Line Items]    
Derivative notional amount 415 473
Credit Rating Below Investment Grade [Member] | Insured Swaps [Member]    
Derivative [Line Items]    
Derivative notional amount $ 20 $ 20