Acquisitions and Divestitures (Schedule of Consolidated Pro Forma Operating Results) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Acquisitions And Divestitures [Abstract]
Pro forma net operating revenues	$ 19,269	$ 18,925
Pro forma net income (loss) attributable to Community Health Systems, Inc. stockholders	$ 87	$ (292)
Pro forma net income (loss) per share attributable to Community Health Systems, Inc. common stockholders:
Basic	$ 0.77	$ (2.63)
Diluted	$ 0.76	$ (2.63)

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- Definition

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(2)-(3)

-URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463

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The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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