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Segment and Geographic Information - Additional Information (Detail) | 9 Months Ended
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Sep. 30, 2018 Hospital
Segment Reporting Information [Line Items] |
Number of geographically organized groups | 2
Number of owned and operated hospitals | 179
Reorganization Group [Member] | National Group [Member] |
Segment Reporting Information [Line Items] |
Number of owned and operated hospitals | 88
Reorganization Group [Member] | American Group [Member] |
Segment Reporting Information [Line Items] |
Number of owned and operated hospitals | 85
Reorganization Group [Member] | Corporate and Other [Member] |
Segment Reporting Information [Line Items] |
Number of owned and operated hospitals | 6

X
- Definition Number of owned and operated hospitals. + References No definition available. + Details
Name: | hca_NumberOfOwnedAndOperatedHospitals
Namespace Prefix: | hca_
Data Type: | xbrli:positiveIntegerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementOperatingActivitiesSegmentAxis=hca_ReorganizationGroupUnitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=hca_NationalGroupMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=hca_AmericanGroupMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=us-gaap_CorporateAndOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |