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Fair Value Measurements - Gains or Losses Recorded Related to Fair Value Option (Details) - Fair Value Option - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Fair Value, Option, Quantitative Disclosures |  |
Fair value option gain (loss) | $ 244 | $ 82
Other bond securities |  |
Fair Value, Option, Quantitative Disclosures |  |
Fair value option gain (loss) | 11 | 2
Alternative investments |  |
Fair Value, Option, Quantitative Disclosures |  |
Fair value option gain (loss) | 24 | 80
Retained investment in Corebridge |  |
Fair Value, Option, Quantitative Disclosures |  |
Fair value option gain (loss) | $ 209 | $ 0

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