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Investments - Additional Information (Detail) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2024 | Dec. 31, 2023
Schedule of Investments [Line Items] |  |
Percentage of investment portfolio by which no other industry group exceeded | 10.00% |
Percentage of stockholders' equity by which no single issuer of fixed maturity securities exceeded | 10 |
Commercial mortgage loans on nonaccrual status | $ 0 | $ 0
Commercial mortgage loans, amortized cost | $ 6,692 | 6,829
Finance and insurance | Fixed maturity securities |  |
Schedule of Investments [Line Items] |  |
Percent of investment portfolio, greater than 10% | 27.00% |
Utilities | Fixed maturity securities |  |
Schedule of Investments [Line Items] |  |
Percent of investment portfolio, greater than 10% | 14.00% |
Consumer-non-cyclical | Fixed maturity securities |  |
Schedule of Investments [Line Items] |  |
Percent of investment portfolio, greater than 10% | 14.00% |
Technology and Communications | Fixed maturity securities |  |
Schedule of Investments [Line Items] |  |
Percent of investment portfolio, greater than 10% | 10.00% |
Industrial |  |
Schedule of Investments [Line Items] |  |
Commercial mortgage loans, amortized cost | $ 1,400 | $ 1,440
Industrial | Commercial mortgage loans | 61 to 90 Days Past Due |  |
Schedule of Investments [Line Items] |  |
Commercial mortgage loans, amortized cost | $ 11 |

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