Condensed Consolidated Statements of Comprehensive (Loss) Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net (loss) income	$ (35)	$ 34
Other comprehensive (loss) income, net of income taxes:
Net change in fair value of available-for-sale debt securities, net of tax	(3)	2
Other comprehensive (loss) income	(3)	2
Comprehensive (loss) income	(38)	36
Less: Comprehensive income attributable to noncontrolling interests	29	16
Comprehensive (loss) income attributable to Community Health Systems, Inc. stockholders	$ (67)	$ 20