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Net Investment Income (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Net Investment Income [Line Items] |  |  |  |
Gross investment income before expenses and fees | $ 833 | $ 809 | $ 1,638 | $ 1,618
Expenses and fees | (25) | (24) | (48) | (46)
Net investment income | 808 | 785 | 1,590 | 1,572
Fixed maturity securities—taxable |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income before expenses and fees | 571 | 567 | 1,125 | 1,128
Fixed maturity securities—non-taxable |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income before expenses and fees | 0 | 1 | 1 | 2
Equity Securities |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income before expenses and fees | 3 | 3 | 5 | 5
Commercial mortgage loans |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income before expenses and fees | 75 | 75 | 150 | 151
Policy Loans |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income before expenses and fees | 56 | 54 | 114 | 109
Limited partnerships |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income before expenses and fees | 36 | 17 | 56 | 45
Other invested assets |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income before expenses and fees | 67 | 70 | 135 | 138
Cash, cash equivalents, restricted cash and short-term investments |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income before expenses and fees | $ 25 | $ 22 | $ 52 | $ 40

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