Fair Value Measurements - Gains or losses recorded related to fair value option (Details) - 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 | ||||
| Total gain (loss) | $ 151 | $ 97 | $ 287 | $ 212 |
| Total liabilities | ||||
| Fair Value, Option, Quantitative Disclosures | ||||
| Total gain (loss) | 2 | 3 | 3 | 2 |
| Policyholder contract deposits | ||||
| Fair Value, Option, Quantitative Disclosures | ||||
| Total gain (loss) | 2 | 3 | 3 | 2 |
| Total assets | ||||
| Fair Value, Option, Quantitative Disclosures | ||||
| Total gain (loss) | 149 | 94 | 284 | 210 |
| Other bond securities | ||||
| Fair Value, Option, Quantitative Disclosures | ||||
| Total gain (loss) | 91 | 14 | 175 | 129 |
| Alternative investments | ||||
| Fair Value, Option, Quantitative Disclosures | ||||
| Total gain (loss) | $ 58 | $ 80 | $ 109 | $ 81 |