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Income Taxes - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Net Investment Income [Line Items] |  |  |  |  |
Effective tax rate | 11.40% | 15.50% | 12.60% | 8.50% |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% | 21.00% | 21.00% | 21.00% |
Accumulated other comprehensive income (loss) | $ (1,778) | $ (1,812) | $ (1,778) | $ (1,812) | $ (2,462)
Fixed maturities |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |
Accumulated other comprehensive income (loss) | $ (1,600) |  | $ (1,600) |  |

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