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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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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.

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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.

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