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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Fair Value, Option, Quantitative Disclosures |  |  |  |
Fair value option gain (loss) | $ 534 | $ 98 | $ 778 | $ 180
Other bond securities |  |  |  |
Fair Value, Option, Quantitative Disclosures |  |  |  |
Fair value option gain (loss) | 16 | 5 | 27 | 7
Alternative investments |  |  |  |
Fair Value, Option, Quantitative Disclosures |  |  |  |
Fair value option gain (loss) | 63 | 28 | 87 | 108
Retained investment in Corebridge |  |  |  |
Fair Value, Option, Quantitative Disclosures |  |  |  |
Fair value option gain (loss) | $ 455 | $ 65 | $ 664 | $ 65

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