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Fair Value Financial Instruments Not Required to Be Carried at Fair Value (Detail) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Commercial mortgage loans, net $ 6,662 $ 6,802
Liabilities:    
Long-term borrowings 1,564 1,584
Off-balance sheet risk 1,529 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 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 1,438 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 0
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Commercial mortgage loans, net 6,094 6,291
Bank loan investments 556 520
Liabilities:    
Long-term borrowings 0 0
Investment contracts 4,804 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 0
Carrying value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Commercial mortgage loans, net 6,662 6,802
Bank loan investments 560 529
Liabilities:    
Long-term borrowings 1,564 1,584
Investment contracts 4,870 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 0
Fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Commercial mortgage loans, net 6,094 6,291
Bank loan investments 556 520
Liabilities:    
Long-term borrowings 1,438 1,413
Investment contracts 4,804 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 0
Notional amount | Commitments to fund bank loan investments    
Liabilities:    
Off-balance sheet risk 150 117
Notional amount | Commitments to fund Private Placement Investments    
Liabilities:    
Off-balance sheet risk 5 42
Notional amount | Commitments to fund commercial mortgage loan investments    
Liabilities:    
Off-balance sheet risk $ 11 $ 13