Goodwill and Other Intangibles - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Changes in the goodwill			$ 0
Goodwill	$ 246,000,000		246,000,000		$ 246,000,000
Amortizable intangible assets related to property and casualty insurance acquisitions	111,000,000		111,000,000		106,000,000
Accumulated amortization	20,000,000		20,000,000		$ 67,000,000
Amortization of intangible assets	$ 2,000,000	$ 1,000,000	$ 7,000,000	$ 5,000,000