Goodwill and Other Intangible Assets - Schedule of Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Goodwill [Roll Forward]
Goodwill	$ 7,033	$ 7,033	$ 7,142
Accumulated impairment losses	(2,814)	(2,814)	(2,814)
Goodwill, total	4,219	4,219	$ 4,328
Goodwill acquired as part of acquisitions during current year	5	1
Goodwill allocated to hospitals divested or held for sale	$ (5)	$ (110)