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Fair Value Measurements - Fair Value Option (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Fair Value Disclosures [Abstract] |  |  |
Fixed maturities, at fair value using the fair value option ("FVO Securities") | $ 292 |  | $ 327
Changes in fair value of assets using fair value option | 4 | $ (8) |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |
Fixed maturities, at fair value using the fair value option ("FVO Securities") | 292 |  | 327
Collateralized Loan Obligations [Member] |  |  |
Fair Value Disclosures [Abstract] |  |  |
Fixed maturities, at fair value using the fair value option ("FVO Securities") | 167 |  | 167
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |
Fixed maturities, at fair value using the fair value option ("FVO Securities") | $ 167 |  | $ 167

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