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Fair Value Measurements - Fair Value Option (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |
Fixed maturities, at fair value using the fair value option ("FVO Securities") | $ 181 |  | $ 181 |  | $ 308
Changes in fair value of assets using fair value option | (13) | $ (1) | (17) | $ 3 |
Collateralized Loan Obligations [Member] |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |
Fixed maturities, at fair value using the fair value option ("FVO Securities") | 181 |  | 181 |  | 308
Fair Value, Option, Residual Interest of Securitizations | $ 181 |  | $ 181 |  | $ 197

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