Fair Value Measurements - Gains or losses recorded related to fair value option (Details) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Mar. 31, 2024 |
Mar. 31, 2023 |
|
| Fair Value, Option, Quantitative Disclosures | ||
| Total gain (loss) | $ 136 | $ 115 |
| Total liabilities | ||
| Fair Value, Option, Quantitative Disclosures | ||
| Total gain (loss) | 1 | (1) |
| Policyholder contract deposits | ||
| Fair Value, Option, Quantitative Disclosures | ||
| Total gain (loss) | 1 | (1) |
| Total assets | ||
| Fair Value, Option, Quantitative Disclosures | ||
| Total gain (loss) | 135 | 116 |
| Other bond securities | ||
| Fair Value, Option, Quantitative Disclosures | ||
| Total gain (loss) | 84 | 115 |
| Alternative investments | ||
| Fair Value, Option, Quantitative Disclosures | ||
| Total gain (loss) | $ 51 | $ 1 |