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Allowance for Credit Losses Related To Commercial Mortgage Loans (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance     $ 27  
Ending balance $ 30   30  
Allowance for Credit Losses        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 29 $ 24 27 $ 22
Provision 1 0 3 2
Write-offs 0 0 0 0
Recoveries 0 0 0 0
Ending balance $ 30 $ 24 $ 30 $ 24