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Long-Term Debt - Additional Information (Detail) (USD $)
 0 Months Ended 3 Months Ended 12 Months Ended
Nov. 30, 2014
Apr. 30, 2014
Dec. 31, 2014
Jun. 30, 2014
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Oct. 31, 2014
Jan. 31, 2015
Nov. 30, 2013
Dec. 06, 2012
Nov. 23, 2010
Debt Instrument [Line Items]                            
Pretax loss on retirement of debt $ 109,000,000us-gaap_GainsLossesOnExtinguishmentOfDebt $ 226,000,000us-gaap_GainsLossesOnExtinguishmentOfDebt $ (68,000,000)us-gaap_GainsLossesOnExtinguishmentOfDebt $ 143,000,000us-gaap_GainsLossesOnExtinguishmentOfDebt $ (49,000,000)us-gaap_GainsLossesOnExtinguishmentOfDebt $ 17,000,000us-gaap_GainsLossesOnExtinguishmentOfDebt $ 335,000,000us-gaap_GainsLossesOnExtinguishmentOfDebt $ 17,000,000us-gaap_GainsLossesOnExtinguishmentOfDebt            
Debt instrument, repayment amount             5,164,000,000us-gaap_RepaymentsOfLongTermDebt 1,662,000,000us-gaap_RepaymentsOfLongTermDebt 2,441,000,000us-gaap_RepaymentsOfLongTermDebt          
Capital leases and other secured debt     573,000,000us-gaap_DebtAndCapitalLeaseObligations       573,000,000us-gaap_DebtAndCapitalLeaseObligations              
Maturity of long-term debt in 2016     2,306,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo       2,306,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo              
Maturity of long-term debt in 2017     2,053,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree       2,053,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree              
Maturity of long-term debt in 2018     2,830,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour       2,830,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour              
Maturity of long-term debt in 2019     2,137,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive       2,137,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive              
Minimum [Member]                            
Debt Instrument [Line Items]                            
Debt instrument, maturities range             2016              
Maximum [Member]                            
Debt Instrument [Line Items]                            
Debt instrument, maturities range             2019              
Interest Rate Swaps [Member]                            
Debt Instrument [Line Items]                            
Notional amount, total     4,000,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember		       4,000,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember		              
Federal Fund Rate [Member]                            
Debt Instrument [Line Items]                            
Debt instrument basis spread             0.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_VariableRateAxis
= hca_FederalFundRateMember		              
Senior Secured Notes Due 2019 [Member]                            
Debt Instrument [Line Items]                            
Debt instrument, principal amount     1,500,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= hca_SeniorSecuredNotesDueTwoThousandNineteenMember		   1,500,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= hca_SeniorSecuredNotesDueTwoThousandNineteenMember		   1,500,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= hca_SeniorSecuredNotesDueTwoThousandNineteenMember		     600,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= hca_SeniorSecuredNotesDueTwoThousandNineteenMember		        
Debt instrument, stated interest   8.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= hca_SeniorSecuredNotesDueTwoThousandNineteenMember		 3.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= hca_SeniorSecuredNotesDueTwoThousandNineteenMember		   3.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= hca_SeniorSecuredNotesDueTwoThousandNineteenMember		   3.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= hca_SeniorSecuredNotesDueTwoThousandNineteenMember		     4.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= hca_SeniorSecuredNotesDueTwoThousandNineteenMember		        
Redemption of aggregate principal amount   1,500,000,000hca_DebtInstrumentRedemptionAmount
/ us-gaap_LongtermDebtTypeAxis
= hca_SeniorSecuredNotesDueTwoThousandNineteenMember		                        
Senior Secured Notes Due 2019 [Member] | Minimum [Member]                            
Debt Instrument [Line Items]                            
Debt instrument, principal amount     600,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= hca_SeniorSecuredNotesDueTwoThousandNineteenMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		       600,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= hca_SeniorSecuredNotesDueTwoThousandNineteenMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		              
Debt instrument, stated interest     4.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= hca_SeniorSecuredNotesDueTwoThousandNineteenMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		       4.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= hca_SeniorSecuredNotesDueTwoThousandNineteenMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		              
Senior Secured Notes Due 2025 [Member]                            
Debt Instrument [Line Items]                            
Debt instrument, principal amount                   1,400,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= hca_SeniorSecuredNotesDueTwoThousandAndTwentyFiveMember		        
Debt instrument, stated interest                   5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= hca_SeniorSecuredNotesDueTwoThousandAndTwentyFiveMember		        
Senior Secured Notes Due 2025 [Member] | Subsequent Event [Member]                            
Debt Instrument [Line Items]                            
Debt instrument, principal amount                     1,000,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= hca_SeniorSecuredNotesDueTwoThousandAndTwentyFiveMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		      
Debt instrument, stated interest                     5.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= hca_SeniorSecuredNotesDueTwoThousandAndTwentyFiveMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		      
Senior Secured Notes Due 2020 [Member]                            
Debt Instrument [Line Items]                            
Debt instrument, stated interest 7.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= hca_SeniorSecuredNotesDueTwoThousandAndTwentyMember		 7.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= hca_SeniorSecuredNotesDueTwoThousandAndTwentyMember		                        
Redemption of aggregate principal amount 1,400,000,000hca_DebtInstrumentRedemptionAmount
/ us-gaap_LongtermDebtTypeAxis
= hca_SeniorSecuredNotesDueTwoThousandAndTwentyMember		 1,250,000,000hca_DebtInstrumentRedemptionAmount
/ us-gaap_LongtermDebtTypeAxis
= hca_SeniorSecuredNotesDueTwoThousandAndTwentyMember		                        
Senior Unsecured Notes Due 2015 [Member] | Subsequent Event [Member]                            
Debt Instrument [Line Items]                            
Debt instrument, principal amount                     750,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= hca_SeniorUnsecuredNotesDueTwoThousandFifteenMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		      
Debt instrument, stated interest                     6.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= hca_SeniorUnsecuredNotesDueTwoThousandFifteenMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		      
Senior Secured Notes Due 2024 [Member]                            
Debt Instrument [Line Items]                            
Debt instrument, principal amount     2,000,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= hca_SeniorSecuredNotesDueTwoThousandTwentyFourMember		   2,000,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= hca_SeniorSecuredNotesDueTwoThousandTwentyFourMember		   2,000,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= hca_SeniorSecuredNotesDueTwoThousandTwentyFourMember		              
Debt instrument, stated interest     5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= hca_SeniorSecuredNotesDueTwoThousandTwentyFourMember		   5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= hca_SeniorSecuredNotesDueTwoThousandTwentyFourMember		   5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= hca_SeniorSecuredNotesDueTwoThousandTwentyFourMember		              
Senior Unsecured Notes Due 2014 [Member]                            
Debt Instrument [Line Items]                            
Debt instrument, stated interest         5.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= hca_SeniorUnsecuredNotesDueTwoThousandFourteenMember		                  
Debt instrument, repayment amount         500,000,000us-gaap_RepaymentsOfLongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= hca_SeniorUnsecuredNotesDueTwoThousandFourteenMember		                  
Senior Secured Second Lien Notes Due 2017 [Member]                            
Debt Instrument [Line Items]                            
Debt instrument, stated interest           9.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= hca_SeniorSecuredSecondLienNotesDueTwoThousandSeventeenMember		                
Redemption of aggregate principal amount           201,000,000us-gaap_DebtInstrumentAnnualPrincipalPayment
/ us-gaap_LongtermDebtTypeAxis
= hca_SeniorSecuredSecondLienNotesDueTwoThousandSeventeenMember		                
Senior Secured Term Loan Facilities [Member]                            
Debt Instrument [Line Items]                            
Loan facility amount matured                       329,000,000hca_TermLoanFacilityAmountMaturedAtMaturityDate
/ us-gaap_LongtermDebtTypeAxis
= hca_SeniorSecuredTermLoanFacilitiesMember		    
Senior Secured Notes Due Two 2020 [Member]                            
Debt Instrument [Line Items]                            
Debt instrument, principal amount     3,000,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= hca_SeniorSecuredNotesDueTwoThousandTwentyMember		       3,000,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= hca_SeniorSecuredNotesDueTwoThousandTwentyMember		              
Debt instrument, stated interest     6.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= hca_SeniorSecuredNotesDueTwoThousandTwentyMember		       6.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= hca_SeniorSecuredNotesDueTwoThousandTwentyMember		              
Senior Secured Notes Due 2022 [Member]                            
Debt Instrument [Line Items]                            
Debt instrument, principal amount     1,350,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= hca_SeniorSecuredNotesDueTwoThousandTwentyTwoMember		       1,350,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= hca_SeniorSecuredNotesDueTwoThousandTwentyTwoMember		              
Debt instrument, stated interest     5.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= hca_SeniorSecuredNotesDueTwoThousandTwentyTwoMember		       5.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= hca_SeniorSecuredNotesDueTwoThousandTwentyTwoMember		              
Senior Secured Notes Due 2023 [Member]                            
Debt Instrument [Line Items]                            
Debt instrument, principal amount     1,250,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= hca_SeniorSecuredNotesDueTwoThousandTwentyThreeMember		       1,250,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= hca_SeniorSecuredNotesDueTwoThousandTwentyThreeMember		              
Debt instrument, stated interest     4.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= hca_SeniorSecuredNotesDueTwoThousandTwentyThreeMember		       4.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= hca_SeniorSecuredNotesDueTwoThousandTwentyThreeMember		              
Senior Secured Notes Due 2025 [Member]                            
Debt Instrument [Line Items]                            
Debt instrument, principal amount     1,400,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= hca_SeniorSecuredNotesDueTwoThousandTwentyFiveMember		       1,400,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= hca_SeniorSecuredNotesDueTwoThousandTwentyFiveMember		              
Debt instrument, stated interest     5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= hca_SeniorSecuredNotesDueTwoThousandTwentyFiveMember		       5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= hca_SeniorSecuredNotesDueTwoThousandTwentyFiveMember		              
Asset-Based Revolving Credit Facility Maturing on March 7, 2019 [Member]                            
Debt Instrument [Line Items]                            
Long-term line of credit     3,250,000,000us-gaap_LineOfCredit
/ us-gaap_LineOfCreditFacilityAxis
= hca_AssetBasedRevolvingCreditFacilityMaturingOnMarchSevenTwoThousandNineteenMember		       3,250,000,000us-gaap_LineOfCredit
/ us-gaap_LineOfCreditFacilityAxis
= hca_AssetBasedRevolvingCreditFacilityMaturingOnMarchSevenTwoThousandNineteenMember		              
Debt instrument maturity date             Mar. 07, 2019              
Percentage of senior secured credit facility over eligible accounts receivable     85.00%hca_PercentageOfSeniorSecuredCreditFacilityOverEligibleAccountsReceivable
/ us-gaap_LineOfCreditFacilityAxis
= hca_AssetBasedRevolvingCreditFacilityMaturingOnMarchSevenTwoThousandNineteenMember		       85.00%hca_PercentageOfSeniorSecuredCreditFacilityOverEligibleAccountsReceivable
/ us-gaap_LineOfCreditFacilityAxis
= hca_AssetBasedRevolvingCreditFacilityMaturingOnMarchSevenTwoThousandNineteenMember		              
Line of credit outstanding     2,880,000,000hca_LineOfCreditAmountOutstanding
/ us-gaap_LineOfCreditFacilityAxis
= hca_AssetBasedRevolvingCreditFacilityMaturingOnMarchSevenTwoThousandNineteenMember		       2,880,000,000hca_LineOfCreditAmountOutstanding
/ us-gaap_LineOfCreditFacilityAxis
= hca_AssetBasedRevolvingCreditFacilityMaturingOnMarchSevenTwoThousandNineteenMember		              
Senior Secured Revolving Credit Facility Maturing On February 26, 2019 [Member]                            
Debt Instrument [Line Items]                            
Long-term line of credit     2,000,000,000us-gaap_LineOfCredit
/ us-gaap_LineOfCreditFacilityAxis
= hca_SeniorSecuredRevolvingCreditFacilityMaturingOnFebruaryTwentySixTwoThousandNineteenMember		       2,000,000,000us-gaap_LineOfCredit
/ us-gaap_LineOfCreditFacilityAxis
= hca_SeniorSecuredRevolvingCreditFacilityMaturingOnFebruaryTwentySixTwoThousandNineteenMember		              
Debt instrument maturity date             Feb. 26, 2019              
Line of credit outstanding     0hca_LineOfCreditAmountOutstanding
/ us-gaap_LineOfCreditFacilityAxis
= hca_SeniorSecuredRevolvingCreditFacilityMaturingOnFebruaryTwentySixTwoThousandNineteenMember		       0hca_LineOfCreditAmountOutstanding
/ us-gaap_LineOfCreditFacilityAxis
= hca_SeniorSecuredRevolvingCreditFacilityMaturingOnFebruaryTwentySixTwoThousandNineteenMember		              
Senior Secured Term Loan A-2 Facility Maturing on May 2, 2016 [Member]                            
Debt Instrument [Line Items]                            
Long-term line of credit     482,000,000us-gaap_LineOfCredit
/ us-gaap_LineOfCreditFacilityAxis
= hca_SeniorSecuredTermLoanTwoFacilityMaturingOnMayTwoTwoThousandSixteenMember		       482,000,000us-gaap_LineOfCredit
/ us-gaap_LineOfCreditFacilityAxis
= hca_SeniorSecuredTermLoanTwoFacilityMaturingOnMayTwoTwoThousandSixteenMember		              
Debt instrument maturity date             May 02, 2016              
Senior Secured Term Loan A-3 Facility Maturing on February 2, 2016 [Member]                            
Debt Instrument [Line Items]                            
Long-term line of credit     717,000,000us-gaap_LineOfCredit
/ us-gaap_LineOfCreditFacilityAxis
= hca_SeniorSecuredTermLoanThreeFacilityMaturingOnFebruaryTwoTwoThousandSixteenMember		       717,000,000us-gaap_LineOfCredit
/ us-gaap_LineOfCreditFacilityAxis
= hca_SeniorSecuredTermLoanThreeFacilityMaturingOnFebruaryTwoTwoThousandSixteenMember		              
Debt instrument maturity date             Feb. 02, 2016              
Senior Secured Term Loan B-3 Facility Maturing on May 1, 2018 [Member]                            
Debt Instrument [Line Items]                            
Long-term line of credit     2,343,000,000us-gaap_LineOfCredit
/ us-gaap_LineOfCreditFacilityAxis
= hca_SeniorSecuredTermLoanBThreeFacilityMaturingOnMayOneTwoThousandEighteenMember		       2,343,000,000us-gaap_LineOfCredit
/ us-gaap_LineOfCreditFacilityAxis
= hca_SeniorSecuredTermLoanBThreeFacilityMaturingOnMayOneTwoThousandEighteenMember		              
Debt instrument maturity date             May 01, 2018              
Senior Secured Term Loan B-2 Facility Maturing on March 31, 2017 [Member]                            
Debt Instrument [Line Items]                            
Long-term line of credit     1,975,000,000us-gaap_LineOfCredit
/ us-gaap_LineOfCreditFacilityAxis
= hca_SeniorSecuredTermLoanBTwoFacilityMaturingOnMarchThirtyOneTwoThousandSeventeenMember		       1,975,000,000us-gaap_LineOfCredit
/ us-gaap_LineOfCreditFacilityAxis
= hca_SeniorSecuredTermLoanBTwoFacilityMaturingOnMarchThirtyOneTwoThousandSeventeenMember		              
Debt instrument maturity date             Mar. 31, 2017              
Maturities Ranging 2016 To 2033 [Member]                            
Debt Instrument [Line Items]                            
Debt instrument, principal amount     6,041,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LineOfCreditFacilityAxis
= hca_MaturitiesRangingTwoThousandSixteenToTwoThousandThirtyThreeMember		       6,041,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LineOfCreditFacilityAxis
= hca_MaturitiesRangingTwoThousandSixteenToTwoThousandThirtyThreeMember		              
Maturities Ranging 2016 To 2033 [Member] | Minimum [Member]                            
Debt Instrument [Line Items]                            
Debt instrument, maturities range             2016              
Maturities Ranging 2016 To 2033 [Member] | Maximum [Member]                            
Debt Instrument [Line Items]                            
Debt instrument, maturities range             2033              
Maturities Ranging 2015 To 2095 [Member]                            
Debt Instrument [Line Items]                            
Debentures, principal amount     886,000,000hca_DebenturesPrincipalAmount
/ us-gaap_LineOfCreditFacilityAxis
= hca_MaturitiesRangingTwoThousandFifteenToTwoThousandNinetyFiveMember		       886,000,000hca_DebenturesPrincipalAmount
/ us-gaap_LineOfCreditFacilityAxis
= hca_MaturitiesRangingTwoThousandFifteenToTwoThousandNinetyFiveMember		              
Maturities Ranging 2015 To 2095 [Member] | Minimum [Member]                            
Debt Instrument [Line Items]                            
Debt instrument, maturities range             2015              
Maturities Ranging 2015 To 2095 [Member] | Maximum [Member]                            
Debt Instrument [Line Items]                            
Debt instrument, maturities range             2095              
Maturity Year 2025 [Member]                            
Debt Instrument [Line Items]                            
Debt instrument, principal amount     125,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LineOfCreditFacilityAxis
= hca_MaturityYearTwoThousandTwentyFiveMember		       125,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LineOfCreditFacilityAxis
= hca_MaturityYearTwoThousandTwentyFiveMember		              
Senior Unsecured Notes Due 2021 [Member]                            
Debt Instrument [Line Items]                            
Debt instrument, principal amount     1,000,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LineOfCreditFacilityAxis
= hca_SeniorUnsecuredNotesDueTwoThousandTwentyOneMember		       1,000,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LineOfCreditFacilityAxis
= hca_SeniorUnsecuredNotesDueTwoThousandTwentyOneMember		           1,000,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LineOfCreditFacilityAxis
= hca_SeniorUnsecuredNotesDueTwoThousandTwentyOneMember		 1,525,000,000us-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
Senior unsecured notes     1,525,000,000us-gaap_UnsecuredDebt
/ us-gaap_LineOfCreditFacilityAxis
= hca_SeniorUnsecuredNotesDueTwoThousandTwentyOneMember		       1,525,000,000us-gaap_UnsecuredDebt
/ us-gaap_LineOfCreditFacilityAxis
= hca_SeniorUnsecuredNotesDueTwoThousandTwentyOneMember		              
Senior Unsecured Notes Unamortized Debt Discounts [Member]                            
Debt Instrument [Line Items]                            
Debt instrument, unamortized discount     $ 2,000,000us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_LineOfCreditFacilityAxis
= hca_SeniorUnsecuredNotesUnamortizedDebtDiscountsMember		       $ 2,000,000us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_LineOfCreditFacilityAxis
= hca_SeniorUnsecuredNotesUnamortizedDebtDiscountsMember