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

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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

+ 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

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+ Details

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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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Balance Type:	na
Period Type:	duration

- 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.

+ References

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+ Details

Name:	us-gaap_LongTermLineOfCredit
Namespace Prefix:	us-gaap_
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.

+ References

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+ Details

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

- 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.

+ References

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+ Details

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

- 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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+ Details

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Balance Type:	credit
Period Type:	instant

- Details

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Balance Type:
Period Type:

- Details

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Period Type:

- Details

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- Details

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- Details

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- Details

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Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=hca_FloatingRateSeniorNotesMember
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Period Type:

- Details

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- Details

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- Details

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Long-Term Debt - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	Feb. 28, 2025	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Debt Instrument [Line Items]
Repayments of debt		$ 3,895	$ 2,066
Senior secured debt		1,022		$ 2,284
Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, principal amount	$ 5,250
Senior Notes [Member] \| Senior Secured Notes Due 2028 [Member]
Debt Instrument [Line Items]
Debt instrument, principal amount	$ 700
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
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
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
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
Debt instrument, stated interest	6.20%
Senior Notes [Member] \| Senior Secured Notes Due 2025 [Member]
Debt Instrument [Line Items]
Debt instrument, stated interest	5.375%
Repayments of debt	$ 2,600
Floating Rate Senior Notes [Member] \| Senior Secured Notes Due 2028 [Member]
Debt Instrument [Line Items]
Debt instrument, principal amount	300,000
Senior Secured Asset-Based Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term line of credit	4,500
Senior Secured Term Loan Facilities [Member]
Debt Instrument [Line Items]
Senior secured debt	1,238	$ 0		$ 1,238
Senior Secured Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term line of credit	3,500
Senior Unsecured Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Senior unsecured	$ 8,000
Senior unsecured revolving credit commitments term	5 years
Senior Unsecured Revolving Credit Facility [Member] \| SOFR [Member]
Debt Instrument [Line Items]
Basis spread on variable interest rate (as percent)	1.25%
Credit spread adjustment	0.10%