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Fair Value Measurements - Fair Value Option (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |
Fixed maturities, at fair value using the fair value option ("FVO Securities") | $ 308 | $ 327 |
Changes in fair value of assets using fair value option | (5) | 5 | $ (28)
Fair Value, Option Residual Interest of Securitizations | $ 197 |  |
Collateralized Loan Obligations [Member] |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |
Fixed maturities, at fair value using the fair value option ("FVO Securities") |  | 327 |
Fair Value, Option Residual Interest of Securitizations |  | $ 167 |

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