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Goodwill and Other Intangible Assets (Other Intangible Assets Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]      
Finite-lived intangible assets acquired during the year $ 112,000,000us-gaap_FinitelivedIntangibleAssetsAcquired1    
Finite-Lived Intangible Assets, Gross 76,000,000us-gaap_FiniteLivedIntangibleAssetsGross 51,000,000us-gaap_FiniteLivedIntangibleAssetsGross  
Finite-Lived Intangible Assets, Net 39,000,000us-gaap_FiniteLivedIntangibleAssetsNet 21,000,000us-gaap_FiniteLivedIntangibleAssetsNet  
Indefinite-Lived Intangible Assets (Excluding Goodwill) 131,000,000us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill 50,000,000us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill  
Capitalized Computer Software, Gross 1,500,000,000us-gaap_CapitalizedComputerSoftwareGross 972,000,000us-gaap_CapitalizedComputerSoftwareGross  
Capitalized Computer Software, Net 790,000,000us-gaap_CapitalizedComputerSoftwareNet 550,000,000us-gaap_CapitalizedComputerSoftwareNet  
Capitalized Computer Software, Development Stage Costs 53,000,000cyh_CapitalizedCostsForInternalUseSoftwareInDevelopmentStage    
Impairment of Intangible Assets, Finite-lived 24,000,000us-gaap_ImpairmentOfIntangibleAssetsFinitelived    
Amortization of software to be abandoned 75,000,000cyh_AmortizationOfSoftwareToBeAbandoned    
Finite-Lived Intangible Assets, Except Capitalized Internal-Use Software [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Weighted-Average Useful Life 4 years    
Acquired Finite-lived Intangible Asset, Residual Value 0us-gaap_AcquiredFiniteLivedIntangibleAssetResidualValue
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= cyh_FiniteLivedIntangibleAssetsExceptCapitalizedInternalUseSoftwareMember
   
Amortization expense 13,000,000us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= cyh_FiniteLivedIntangibleAssetsExceptCapitalizedInternalUseSoftwareMember
6,000,000us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= cyh_FiniteLivedIntangibleAssetsExceptCapitalizedInternalUseSoftwareMember
7,000,000us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= cyh_FiniteLivedIntangibleAssetsExceptCapitalizedInternalUseSoftwareMember
Amortization expense for 2015 14,000,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= cyh_FiniteLivedIntangibleAssetsExceptCapitalizedInternalUseSoftwareMember
   
Amortization expense for 2016 13,000,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= cyh_FiniteLivedIntangibleAssetsExceptCapitalizedInternalUseSoftwareMember
   
Amortization expense for 2017 3,000,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= cyh_FiniteLivedIntangibleAssetsExceptCapitalizedInternalUseSoftwareMember
   
Amortization expense for 2018 2,000,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= cyh_FiniteLivedIntangibleAssetsExceptCapitalizedInternalUseSoftwareMember
   
Amortization expense for 2019 2,000,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= cyh_FiniteLivedIntangibleAssetsExceptCapitalizedInternalUseSoftwareMember
   
Amortization expense thereafter 5,000,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= cyh_FiniteLivedIntangibleAssetsExceptCapitalizedInternalUseSoftwareMember
   
Capitalized Internal Use Software [Member]      
Finite-Lived Intangible Assets [Line Items]      
Acquired Finite-lived Intangible Asset, Residual Value 0us-gaap_AcquiredFiniteLivedIntangibleAssetResidualValue
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= cyh_CapitalizedInternalUseSoftwareMember
   
Amortization expense 260,000,000us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= cyh_CapitalizedInternalUseSoftwareMember
139,000,000us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= cyh_CapitalizedInternalUseSoftwareMember
99,000,000us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= cyh_CapitalizedInternalUseSoftwareMember
Amortization expense for 2015 178,000,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= cyh_CapitalizedInternalUseSoftwareMember
   
Amortization expense for 2016 149,000,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= cyh_CapitalizedInternalUseSoftwareMember
   
Amortization expense for 2017 117,000,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= cyh_CapitalizedInternalUseSoftwareMember
   
Amortization expense for 2018 74,000,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= cyh_CapitalizedInternalUseSoftwareMember
   
Amortization expense for 2019 67,000,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= cyh_CapitalizedInternalUseSoftwareMember
   
Amortization expense thereafter $ 205,000,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= cyh_CapitalizedInternalUseSoftwareMember
   
Capitalized Internal Use Software, Except Significant System Conversions [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Weighted-Average Useful Life 3 years    
Minimum [Member] | Capitalized Internal Use Software, Significant System Conversions [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Weighted-Average Useful Life 8 years    
Maximum [Member] | Capitalized Internal Use Software, Significant System Conversions [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Weighted-Average Useful Life 10 years