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Supplemental Condensed Consolidating Financial Information and Other Collateral-Related Information - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
Nov. 22, 2010
Dec. 31, 2014
Dec. 06, 2012
Nov. 23, 2010
Supplemental Condensed Consolidating Financial Information [Line Items]        
Ownership percentage held by parent 100.00%hca_OwnershipPercentageByParent      
Senior Unsecured Notes Due 2021 [Member]        
Supplemental Condensed Consolidating Financial Information [Line Items]        
Debt instrument, principal amount   $ 1,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LineOfCreditFacilityAxis
= hca_SeniorUnsecuredNotesDueTwoThousandTwentyOneMember		 $ 1,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LineOfCreditFacilityAxis
= hca_SeniorUnsecuredNotesDueTwoThousandTwentyOneMember		 $ 1,525us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LineOfCreditFacilityAxis
= hca_SeniorUnsecuredNotesDueTwoThousandTwentyOneMember
Debt instrument, stated interest     6.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LineOfCreditFacilityAxis
= hca_SeniorUnsecuredNotesDueTwoThousandTwentyOneMember		 7.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LineOfCreditFacilityAxis
= hca_SeniorUnsecuredNotesDueTwoThousandTwentyOneMember