Debt instrument, credit spread adjustment.

No definition available.

Name:	hca_DebtInstrumentCreditSpreadAdjustment
Namespace Prefix:	hca_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Senior unsecured revolving credit commitments term.

+ References

No definition available.

+ Details

Name:	hca_SeniorUnsecuredRevolvingCreditCommitmentsTerm
Namespace Prefix:	hca_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- 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.

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+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Indicates type of variable interest rate on debt instrument.

+ References

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Namespace Prefix:	us-gaap_
Data Type:	enum2:enumerationSetItemType
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Period Type:	duration

- Definition

Indicates type of variable interest rate of investment.

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Balance Type:	na
Period Type:	instant

- Definition

Maximum amount borrowed under the credit facility at any time during the period.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The carrying value as of the balance sheet date of the noncurrent portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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- Definition

Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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- Definition

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer).

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Debt - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended				9 Months Ended
	Sep. 30, 2025	Jun. 30, 2025	Apr. 30, 2025	Feb. 28, 2025	Oct. 30, 2025	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Debt Instrument [Line Items]
Repayments of debt						$ 5,834,000	$ 2,346,000
Commercial Paper [Member]
Debt Instrument [Line Items]
Debt instrument, principal amount		$ 4,000,000
Commercial paper outstanding	$ 1,910,000					1,910,000		$ 0
Commercial Paper [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt maturities, term		397 days
Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, principal amount				$ 5,250,000
Senior Notes [Member] \| Senior Secured Notes Due 2028 [Member]
Debt Instrument [Line Items]
Debt instrument, principal amount				$ 700,000
Debt instrument, stated interest				5.00%
Senior Notes [Member] \| Senior Secured Notes Due 2030 [Member]
Debt Instrument [Line Items]
Debt instrument, principal amount				$ 750,000,000
Debt instrument, stated interest				5.25%
Senior Notes [Member] \| Senior Secured Notes Due 2032 [Member]
Debt Instrument [Line Items]
Debt instrument, principal amount				$ 750,000,000
Debt instrument, stated interest				5.50%
Senior Notes [Member] \| Senior Secured Notes Due 2035 [Member]
Debt Instrument [Line Items]
Debt instrument, principal amount				$ 1,500,000
Debt instrument, stated interest				5.75%
Senior Notes [Member] \| Senior Secured Notes Due 2055 [Member]
Debt Instrument [Line Items]
Debt instrument, principal amount				$ 1,250,000
Debt instrument, stated interest				6.20%
Senior Notes [Member] \| Senior Notes Due 2025 [Member]
Debt Instrument [Line Items]
Debt instrument, stated interest				5.375%
Repayments of debt				$ 2,600,000
Floating Rate Senior Notes [Member] \| Senior Secured Notes Due 2028 [Member]
Debt Instrument [Line Items]
Debt instrument, principal amount				300,000,000
Senior Secured Asset-Based Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term line of credit				4,500,000
Senior Secured Term Loan Facilities [Member]
Debt Instrument [Line Items]
Senior secured debt	$ 0			1,238,000		0		$ 1,238,000
Senior Secured Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term line of credit				3,500,000
Senior Unsecured Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt instrument, stated interest		7.69%	5.25%
Repayments of debt		$ 291,000	$ 1,400,000
Senior unsecured				$ 8,000,000
Senior unsecured revolving credit commitments term				5 years
Total committed capacity of senior unsecured credit facility		$ 8,000
Borrowings outstanding						$ 0
Senior Unsecured Revolving Credit Facility [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Basis spread on variable interest rate (as percent)					1.25%
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]					Secured Overnight Financing Rate (SOFR) [Member]
Credit spread adjustment					0.10%
Investment, Variable Interest Rate, Type [Extensible Enumeration]					Secured Overnight Financing Rate (SOFR) [Member]
Medium Unsecured Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt instrument, stated interest	7.58%					7.58%
Repayments of debt	$ 125,000