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Investments - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Schedule of Investments [Line Items]    
Percentage of investment portfolio by which no other industry group exceeded 10.00%  
Percentage of stockholders' equity by which no single issuer of fixed maturity securities exceeded 10  
Commercial mortgage loans on nonaccrual status $ 0  
Total Assets 99,171 $ 105,747
Commercial mortgage loans, amortized cost 6,856 6,774
Commercial mortgage-backed    
Schedule of Investments [Line Items]    
Commercial mortgage loans,Allowance for credit losses 0  
Limited Partnerships | Variable interest Entity, not primary beneficiary    
Schedule of Investments [Line Items]    
Total Assets $ 1,829 1,018
Finance and insurance | Fixed maturity securities    
Schedule of Investments [Line Items]    
Percent of investment portfolio, greater than 10% 25.00%  
Utilities | Fixed maturity securities    
Schedule of Investments [Line Items]    
Percent of investment portfolio, greater than 10% 13.00%  
Consumer-non-cyclical | Fixed maturity securities    
Schedule of Investments [Line Items]    
Percent of investment portfolio, greater than 10% 15.00%  
Insurance [Member]    
Schedule of Investments [Line Items]    
Securities on deposit with various state government insurance departments $ 45 46
Technology and Communications [Member] | Fixed maturity securities    
Schedule of Investments [Line Items]    
Percent of investment portfolio, greater than 10% 11.00%  
Office    
Schedule of Investments [Line Items]    
Commercial mortgage loans, amortized cost $ 1,526 $ 1,567
Write-offs 8  
Office | 31 to 60 Past due    
Schedule of Investments [Line Items]    
Commercial mortgage loans, amortized cost $ 22