Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 37	$ 93	$ 2	$ 126
Other comprehensive income (loss), net of income taxes:
Net change in fair value of available-for-sale debt securities, net of tax	1	2	(3)	4
Amortization and recognition of unrecognized pension cost components, net of tax			1
Other comprehensive income (loss)	1	2	(2)	4
Comprehensive income	38	95		130
Less: Comprehensive income attributable to noncontrolling interests	31	23	60	39
Comprehensive income (loss) attributable to Community Health Systems, Inc. stockholders	$ 7	$ 72	$ (60)	$ 91