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Fair Value Measurements - Fair Value Hierarchy for Assets Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Fixed maturities, at fair value | $ 17,077 | $ 16,182
Fair value of asset | 29,841 | 28,628
Separate accounts | 991 | 952
Top Hat savings plan mutual funds and common equity (included in Other assets) | 94 | 87
Short-Term Investments | 100 | 298
Corporate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Fixed maturities, at fair value | 8,987 | 8,380
States, municipalities and political subdivisions |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Fixed maturities, at fair value | 4,708 | 4,721
Government-sponsored enterprises |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Fixed maturities, at fair value | 2,447 | 2,274
Asset-backed |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Fixed maturities, at fair value | 732 | 551
United States government |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Fixed maturities, at fair value | 183 | 226
Foreign government |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Fixed maturities, at fair value | 20 | 30
Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Fixed maturities, at fair value | 183 | 226
Fair value of asset | 11,705 | 11,447
Top Hat savings plan mutual funds and common equity (included in Other assets) | 94 | 87
Short-Term Investments | 100 | 298
Level 1 | Corporate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Fixed maturities, at fair value | 0 | 0
Level 1 | States, municipalities and political subdivisions |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Fixed maturities, at fair value | 0 | 0
Level 1 | Government-sponsored enterprises |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Fixed maturities, at fair value | 0 | 0
Level 1 | Asset-backed |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Fixed maturities, at fair value | 0 | 0
Level 1 | United States government |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Fixed maturities, at fair value | 183 | 226
Level 1 | Foreign government |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Fixed maturities, at fair value | 0 | 0
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Fixed maturities, at fair value | 16,894 | 15,956
Fair value of asset | 18,136 | 17,181
Top Hat savings plan mutual funds and common equity (included in Other assets) | 0 | 0
Short-Term Investments | 0 | 0
Level 2 | Corporate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Fixed maturities, at fair value | 8,987 | 8,380
Level 2 | States, municipalities and political subdivisions |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Fixed maturities, at fair value | 4,708 | 4,721
Level 2 | Government-sponsored enterprises |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Fixed maturities, at fair value | 2,447 | 2,274
Level 2 | Asset-backed |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Fixed maturities, at fair value | 732 | 551
Level 2 | United States government |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Fixed maturities, at fair value | 0 | 0
Level 2 | Foreign government |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Fixed maturities, at fair value | 20 | 30
Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Fixed maturities, at fair value | 0 | 0
Fair value of asset | 0 | 0
Top Hat savings plan mutual funds and common equity (included in Other assets) | 0 | 0
Short-Term Investments | 0 | 0
Level 3 | Corporate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Fixed maturities, at fair value | 0 | 0
Level 3 | States, municipalities and political subdivisions |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Fixed maturities, at fair value | 0 | 0
Level 3 | Government-sponsored enterprises |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Fixed maturities, at fair value | 0 | 0
Level 3 | Asset-backed |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Fixed maturities, at fair value | 0 | 0
Level 3 | United States government |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Fixed maturities, at fair value | 0 | 0
Level 3 | Foreign government |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Fixed maturities, at fair value | 0 | 0
Equity securities | Common equities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Fair value of asset | 11,309 | 10,836
Equity securities | Nonredeemable preferred equities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Fair value of asset | 340 | 349
Equity securities | Level 1 | Common equities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Fair value of asset | 11,309 | 10,836
Equity securities | Level 1 | Nonredeemable preferred equities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Fair value of asset | 0 | 0
Equity securities | Level 2 | Common equities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Fair value of asset | 0 | 0
Equity securities | Level 2 | Nonredeemable preferred equities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Fair value of asset | 340 | 349
Equity securities | Level 3 | Common equities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Fair value of asset | 0 | 0
Equity securities | Level 3 | Nonredeemable preferred equities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Fair value of asset | 0 | 0
Separate accounts taxable fixed maturities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Separate accounts | 921 | 876
Separate accounts taxable fixed maturities | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Separate accounts | 19 | 0
Separate accounts taxable fixed maturities | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Separate accounts | 902 | 876
Separate accounts taxable fixed maturities | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Separate accounts | $ 0 | $ 0

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