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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Fair Value, Option, Quantitative Disclosures |  |  |  |
Fair value option gain (loss) | $ (240) | $ 61 | $ 538 | $ 241
Other bond securities |  |  |  |
Fair Value, Option, Quantitative Disclosures |  |  |  |
Fair value option gain (loss) | 10 | 20 | 37 | 27
Alternative investments |  |  |  |
Fair Value, Option, Quantitative Disclosures |  |  |  |
Fair value option gain (loss) | 98 | 76 | 185 | 184
Retained investment in Corebridge |  |  |  |
Fair Value, Option, Quantitative Disclosures |  |  |  |
Fair value option gain (loss) | $ (348) | $ (35) | $ 316 | $ 30

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