Goodwill and Other Intangible Assets - Schedule of Goodwill (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Goodwill [Roll Forward]
Goodwill Gross, Balance, beginning period	$ 7,039	$ 7,142
Accumulated impairment losses, Balance, beginning of period	(2,814)	$ (2,814)
Goodwill, Balance, beginning of period	4,328
Goodwill allocated to hospitals held for sale	(103)
Goodwill, Balance, end of period	$ 4,225