Stockholders' Deficit - Schedule of Impact of Noncontrolling Interest to Stockholders' Deficit (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Equity [Abstract]
Net (loss) income attributable to Community Health Systems, Inc. stockholders	$ (64)	$ 18
Net increase in Community Health Systems, Inc. paid-in-capital for purchase of subsidiary partnership interests		(1)
Net transfers to noncontrolling interests		(1)
Change to Community Health Systems, Inc. stockholders' deficit from net (loss) income attributable to Community Health Systems, Inc. stockholders and transfers to noncontrolling interests	$ (64)	$ 17