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Goodwill and Other Intangibles - Narrative (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2026 | Mar. 31, 2025 | Dec. 31, 2025
Goodwill and Intangible Assets Disclosure [Abstract] |  |  |
Changes in the goodwill | $ 0 |  |
Goodwill | 327,000,000 |  | $ 327,000,000
Amortizable intangible assets related to property and casualty insurance acquisitions | 184,000,000 |  | 189,000,000
Accumulated amortization | 80,000,000 |  | $ 75,000,000
Amortization of intangible assets | $ 5,000,000 | $ 5,000,000 |

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