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Investments - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
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  
Modified or extended troubled debt restructurings $ 0 $ 0
Investments in partnerships or similar entities generally considered VIEs 654 616
Fixed Rate Commercial Mortgage Loans    
Schedule of Investments [Line Items]    
Commercial mortgage loans on nonaccrual status $ 0 $ 0
Finance and insurance | Fixed maturity securities    
Schedule of Investments [Line Items]    
Percent of investment portfolio, greater than 10% 23.00%  
Utilities | Fixed maturity securities    
Schedule of Investments [Line Items]    
Percent of investment portfolio, greater than 10% 14.00%  
Consumer-non-cyclical | Fixed maturity securities    
Schedule of Investments [Line Items]    
Percent of investment portfolio, greater than 10% 15.00%  
Technology and Communications [Member] | Fixed maturity securities    
Schedule of Investments [Line Items]    
Percent of investment portfolio, greater than 10% 11.00%