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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, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Fair Value, Option, Quantitative Disclosures |  |  |  |
Fair value option gain (loss) | $ 98 | $ 43 | $ 180 | $ 139
Other bond securities |  |  |  |
Fair Value, Option, Quantitative Disclosures |  |  |  |
Fair value option gain (loss) | 5 | (11) | 7 | 9
Alternative investments |  |  |  |
Fair Value, Option, Quantitative Disclosures |  |  |  |
Fair value option gain (loss) | 28 | 54 | 108 | 130
All other investments |  |  |  |
Fair Value, Option, Quantitative Disclosures |  |  |  |
Fair value option gain (loss) | $ 65 | $ 0 | $ 65 | $ 0

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