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Goodwill and Other Intangibles - Narrative (Details) - USD ($)	3 Months Ended			12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Goodwill [Line Items]
Goodwill impairment		$ 0	$ 0	$ 431,000,000	$ 0	$ 0
Goodwill				79,121,000,000	79,552,000,000	$ 79,749,000,000
Cumulative goodwill impairments				6,600,000,000	$ 6,100,000,000
Long-Term Care Reporting Unit
Goodwill [Line Items]
Goodwill impairment	$ 431,000,000
Goodwill				0
Long-Term Care Reporting Unit \| Customer Lists
Goodwill [Line Items]
Intangible assets related to customer lists				$ 2,700,000,000