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Net Investment Allowance for Credit Losses (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]        
Beginning Balance $ 15 $ 7 $ 0  
Increase from securities without allowance in previous periods 0 0 15  
Increase (decrease) from securities with allowance in previous periods 0 0 0  
Securities Sold (9) (7) (9)  
Decrease due to change in intent or requirement to sell 0 0 0  
Write-offs (2) 0 (2)  
Recoveries 0 0 0  
Ending Balance $ 4 $ 0 $ 4  
Investment, Type [Extensible Enumeration] Fixed Maturities [Member] Fixed Maturities [Member] Fixed Maturities [Member] Fixed Maturities [Member]
U.S. corporate        
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]        
Beginning Balance $ 9 $ 0 $ 0  
Increase from securities without allowance in previous periods 0   9  
Increase (decrease) from securities with allowance in previous periods 0   0  
Securities Sold (7)   (7)  
Decrease due to change in intent or requirement to sell 0   0  
Write-offs (2)   (2)  
Recoveries 0   0  
Ending Balance 0 0 0  
Commercial mortgage-backed        
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]        
Beginning Balance 6 7 0  
Increase from securities without allowance in previous periods 0 0 6  
Increase (decrease) from securities with allowance in previous periods 0 0 0  
Securities Sold (2) (7) (2)  
Decrease due to change in intent or requirement to sell 0 0 0  
Write-offs 0 0 0  
Recoveries 0 0 0  
Ending Balance $ 4 $ 0 $ 4