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Goodwill and Other Intangibles - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Goodwill [Line Items]
Goodwill impairment	$ 431	$ 0	$ 431	$ 0
Goodwill	79,121		79,121		$ 79,552
Cumulative goodwill impairments	6,600		6,600		6,100
Long-Term Care Reporting Unit
Goodwill [Line Items]
Goodwill impairment	431
Goodwill	0		0
Retail/ LTC
Goodwill [Line Items]
Goodwill impairment			431
Goodwill	$ 10,376		$ 10,376		$ 10,807