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Derivative Instruments (Narrative) (Detail)
$ in Millions
Sep. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Derivative [Line Items]    
Cash collateral posted to derivative counterparties $ 0 $ 0
Securities posted as collateral to derivative counterparties $ 237 $ 181
Number of credit support annexes 1 1
Fair value of Credit Support Annex $ 1 $ 1
Derivative Instrument [Member] | Not Designated as Hedging Instrument [Member]    
Derivative [Line Items]    
Insured swaps 2,566 2,737
Insured Swaps [Member] | Derivative Instrument [Member] | Not Designated as Hedging Instrument [Member]    
Derivative [Line Items]    
Insured swaps   1,925
Insurance Operations [Member]    
Derivative [Line Items]    
Insured swaps 1,785 1,957
Insurance Operations [Member] | Insured Swaps [Member]    
Derivative [Line Items]    
Insured swaps 1,762 1,925 [1]
Insurance Operations [Member] | Credit Rating Aa [Member]    
Derivative [Line Items]    
Insured swaps 59 121
Insurance Operations [Member] | Credit Rating Aa [Member] | Insured Swaps [Member]    
Derivative [Line Items]    
Insured swaps 59 121 [2]
Insurance Operations [Member] | Credit Rating A [Member]    
Derivative [Line Items]    
Insured swaps 1,341 1,371
Insurance Operations [Member] | Credit Rating A [Member] | Insured Swaps [Member]    
Derivative [Line Items]    
Insured swaps 1,341 1,371 [3]
Insurance Operations [Member] | Credit Rating Bbb [Member]    
Derivative [Line Items]    
Insured swaps 362 433
Insurance Operations [Member] | Credit Rating Bbb [Member] | Insured Swaps [Member]    
Derivative [Line Items]    
Insured swaps $ 362 433 [4]
Previously Reported [Member] | Insured Swaps [Member] | Derivative Instrument [Member] | Not Designated as Hedging Instrument [Member]    
Derivative [Line Items]    
Insured swaps   1,795
Previously Reported [Member] | Insurance Operations [Member] | Insured Swaps [Member]    
Derivative [Line Items]    
Insured swaps   1,795
Previously Reported [Member] | Insurance Operations [Member] | Credit Rating Aa [Member] | Insured Swaps [Member]    
Derivative [Line Items]    
Insured swaps   66
Previously Reported [Member] | Insurance Operations [Member] | Credit Rating A [Member] | Insured Swaps [Member]    
Derivative [Line Items]    
Insured swaps   1,284
Previously Reported [Member] | Insurance Operations [Member] | Credit Rating Bbb [Member] | Insured Swaps [Member]    
Derivative [Line Items]    
Insured swaps   $ 445
[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.