Goodwill and Specifically Identifiable Intangible Assets - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2023	Dec. 31, 2022
Goodwill [Line Items]
Future sales volume and product mix used to forecast		10 years
Goodwill impairment loss		$ 0	$ 634
Life Insurance
Goodwill [Line Items]
Goodwill impairment loss	$ 634		$ 634