Summarized Financial Information (Summarized Statements of Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Condensed Financial Statements, Captions [Line Items]
Net operating revenues	$ 3,025	$ 3,376
Income from operations	110	189
Net income	34	(101)
Net income attributable to Community Health Systems, Inc. Stockholders	18	$ (118)
Parent Company, Subsidiary Issuer And Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net operating revenues	1,996
Income from operations	249
Net income	86
Net income attributable to Community Health Systems, Inc. Stockholders	$ 86