Stockholders' Deficit - Schedule of Impact of Noncontrolling Interest to Stockholders' Deficit (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Equity [Abstract]
Net income (loss) attributable to Community Health Systems, Inc. stockholders	$ 112	$ (17)	$ 200	$ (302)
Net increase in Community Health Systems, Inc. paid-in-capital for purchase of subsidiary partnership interests		2		1
Net transfers to the noncontrolling interests		2		1
Change to Community Health Systems, Inc. stockholders' deficit from net income (loss) attributable to Community Health Systems, Inc. stockholders and transfers to noncontrolling interests	$ 112	$ (15)	$ 200	$ (301)