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Goodwill and Other Intangibles - 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
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$ 327		$ 327		$ 305
Changes in the goodwill			22
Amortizable intangible assets related to property and casualty insurance acquisitions	192		192		203
Accumulated amortization	69		69		$ 59
Amortization of intangible assets	5	$ 5	$ 15	$ 14
Write-off of amortizable intangible assets	$ 2

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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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