Stockholders' Deficit - Schedule of Impact of Noncontrolling Interest to Stockholders' Deficit (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Equity [Abstract]
Net income (loss) attributable to Community Health Systems, Inc. stockholders	$ 6	$ 70	$ (58)	$ 87
Net increase in Community Health Systems, Inc. paid-in-capital for purchase of subsidiary partnership interests		1
Net transfers to the noncontrolling interests		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	$ 6	$ 71	$ (58)	$ 87