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Fair Value Financial Instruments Not Required to Be Carried at Fair Value (Detail) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Commercial mortgage loans, net $ 6,532 $ 6,802
Liabilities:    
Long-term borrowings 1,548 1,584
Off-balance sheet risk 1,638 1,530
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Commercial mortgage loans, net 0 0
Bank loan investments 0 0
Liabilities:    
Long-term borrowings 0 0
Investment contracts 0 0
Level 1 | Commitments to fund bank loan investments    
Liabilities:    
Off-balance sheet risk 0 0
Level 1 | Commitments to fund Private Placement Investments    
Liabilities:    
Off-balance sheet risk 0 0
Level 1 | Commitments to fund commercial mortgage loan investments    
Liabilities:    
Off-balance sheet risk   0
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Commercial mortgage loans, net 0 0
Bank loan investments 0 0
Liabilities:    
Long-term borrowings 1,474 1,413
Investment contracts 0 0
Level 2 | Commitments to fund bank loan investments    
Liabilities:    
Off-balance sheet risk 0 0
Level 2 | Commitments to fund Private Placement Investments    
Liabilities:    
Off-balance sheet risk 0 0
Level 2 | Commitments to fund commercial mortgage loan investments    
Liabilities:    
Off-balance sheet risk   0
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Commercial mortgage loans, net 6,168 6,291
Bank loan investments 566 520
Liabilities:    
Long-term borrowings 0 0
Investment contracts 4,767 5,372
Level 3 | Commitments to fund bank loan investments    
Liabilities:    
Off-balance sheet risk 0 0
Level 3 | Commitments to fund Private Placement Investments    
Liabilities:    
Off-balance sheet risk 0 0
Level 3 | Commitments to fund commercial mortgage loan investments    
Liabilities:    
Off-balance sheet risk   0
Carrying value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Commercial mortgage loans, net 6,532 6,802
Bank loan investments 568 529
Liabilities:    
Long-term borrowings 1,548 1,584
Investment contracts 4,686 5,346
Carrying value | Commitments to fund bank loan investments    
Liabilities:    
Off-balance sheet risk 0 0
Carrying value | Commitments to fund Private Placement Investments    
Liabilities:    
Off-balance sheet risk 0 0
Carrying value | Commitments to fund commercial mortgage loan investments    
Liabilities:    
Off-balance sheet risk   0
Fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Commercial mortgage loans, net 6,168 6,291
Bank loan investments 566 520
Liabilities:    
Long-term borrowings 1,474 1,413
Investment contracts 4,767 5,372
Fair value | Commitments to fund bank loan investments    
Liabilities:    
Off-balance sheet risk 0 0
Fair value | Commitments to fund Private Placement Investments    
Liabilities:    
Off-balance sheet risk 0 0
Fair value | Commitments to fund commercial mortgage loan investments    
Liabilities:    
Off-balance sheet risk   0
Notional amount | Commitments to fund bank loan investments    
Liabilities:    
Off-balance sheet risk 131 117
Notional amount | Commitments to fund Private Placement Investments    
Liabilities:    
Off-balance sheet risk $ 271 42
Notional amount | Commitments to fund commercial mortgage loan investments    
Liabilities:    
Off-balance sheet risk   $ 13