Goodwill and Other Intangibles - Narrative (Details) - USD ($) |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
Dec. 31, 2024 |
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| Goodwill and Intangible Assets Disclosure [Abstract] | |||||
| Changes in the goodwill | $ 0 | ||||
| Goodwill | $ 305,000,000 | 305,000,000 | $ 305,000,000 | ||
| Amortizable intangible assets related to property and casualty insurance acquisitions | 193,000,000 | 193,000,000 | 203,000,000 | ||
| Accumulated amortization | 69,000,000 | 69,000,000 | $ 59,000,000 | ||
| Amortization of intangible assets | $ 5,000,000 | $ 4,000,000 | $ 10,000,000 | $ 9,000,000 | |
| X | ||||||||||
- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- References No definition available.
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- Definition Amount of increase (decrease) of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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