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Fair Value Measurements - Gains or Losses Recorded Related to Fair Value Option (Details) - Fair Value Option - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Fair Value, Option, Quantitative Disclosures |  |  |
Fair value option gain (loss) | $ 715 | $ 266 | $ (136)
Other bond securities |  |  |
Fair Value, Option, Quantitative Disclosures |  |  |
Fair value option gain (loss) | 19 | 46 | (374)
Alternative investments |  |  |
Fair Value, Option, Quantitative Disclosures |  |  |
Fair value option gain (loss) | 257 | 220 | 32
Retained investment in Corebridge |  |  |
Fair Value, Option, Quantitative Disclosures |  |  |
Fair value option gain (loss) | $ 439 | $ 0 | $ 0

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