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v3.20.1

Subsequent Events - Additional Information (Detail) - Subsequent Event [Member] - USD ($) $ in Millions |  | 1 Months Ended
--- | --- | ---
Apr. 24, 2020 | Apr. 30, 2020
Subsequent Event [Line Items] |  |
Proceeds from accelerated medicare payment requests |  | $ 4,300
Proceeds from CARES Act provider relief fund |  | 900
CARES Act provider relief fund |  | $ 50,000
Covid19 [Member] |  |
Subsequent Event [Line Items] |  |
Additional Appropriations To Uncertainities | $ 75,000 |

X
- Definition Additional appropriations to uncertainities. + References No definition available. + Details
Name: | hca_AppropriationsToUncertainities
Namespace Prefix: | hca_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition CARES Act provider relief fund. + References No definition available. + Details
Name: | hca_CaresActProviderReliefFund
Namespace Prefix: | hca_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Proceeds from accelerated medicare payment requests. + References No definition available. + Details
Name: | hca_ProceedsFromAcceleratedMedicarePaymentRequests
Namespace Prefix: | hca_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Proceeds from CARES act provider relief fund. + References No definition available. + Details
Name: | hca_ProceedsFromCaresActProviderReliefFund
Namespace Prefix: | hca_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_UnusualRiskOrUncertaintyByNatureAxis=hca_Covid19Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |