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Derivative Instruments (Credit Derivatives Sold) (Detail) - Insurance Operations [Member] - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Derivative [Line Items]    
Derivative notional amount $ 1,785 $ 1,957
Total fair value of credit derivatives $ (10) $ (9)
Credit Default Swap [Member]    
Derivative [Line Items]    
Weighted average remaining expected maturity 3 months 18 days 1 year
Derivative notional amount $ 23 $ 32
Total fair value of credit derivatives $ (8) $ (7)
Insured Swaps [Member]    
Derivative [Line Items]    
Weighted average remaining expected maturity 14 years 1 month 6 days 14 years
Derivative notional amount $ 1,762 $ 1,925 [1]
Total fair value of credit derivatives (2) (2)
Credit Rating Aaa [Member]    
Derivative [Line Items]    
Derivative notional amount 0 0
Total fair value of credit derivatives 0 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 0
Credit Rating Aa [Member]    
Derivative [Line Items]    
Derivative notional amount 59 121
Total fair value of credit derivatives 0 0
Credit Rating Aa [Member] | Credit Default Swap [Member]    
Derivative [Line Items]    
Derivative notional amount 0 0
Credit Rating Aa [Member] | Insured Swaps [Member]    
Derivative [Line Items]    
Derivative notional amount 59 121 [2]
Credit Rating A [Member]    
Derivative [Line Items]    
Derivative notional amount 1,341 1,371
Total fair value of credit derivatives (1) (1)
Credit Rating A [Member] | Credit Default Swap [Member]    
Derivative [Line Items]    
Derivative notional amount 0 0
Credit Rating A [Member] | Insured Swaps [Member]    
Derivative [Line Items]    
Derivative notional amount 1,341 1,371 [3]
Credit Rating Bbb [Member]    
Derivative [Line Items]    
Derivative notional amount 362 433
Total fair value of credit derivatives (1) (1)
Credit Rating Bbb [Member] | Credit Default Swap [Member]    
Derivative [Line Items]    
Derivative notional amount 0 0
Credit Rating Bbb [Member] | Insured Swaps [Member]    
Derivative [Line Items]    
Derivative notional amount 362 433 [4]
Credit Rating Below Investment Grade [Member]    
Derivative [Line Items]    
Derivative notional amount 23 32
Total fair value of credit derivatives (8) (7)
Credit Rating Below Investment Grade [Member] | Credit Default Swap [Member]    
Derivative [Line Items]    
Derivative notional amount 23 32
Credit Rating Below Investment Grade [Member] | Insured Swaps [Member]    
Derivative [Line Items]    
Derivative notional amount $ 0 $ 0
[1] The Company revised its previously reported amount of $1,795 million to $1,925 million.
[2] The Company revised its previously reported amount of $66 million to $121 million.
[3] The Company revised its previously reported amount of $1,284 million to $1,371 million.
[4] The Company revised its previously reported amount of $445 million to $433 million.