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Share Repurchase Transactions and Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Parenthetical) (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2025 USD ($)
Equity [Abstract]
Unrealized losses on available-for-sale securities, net of income taxes	$ 3
Foreign currency translation adjustments, net of income taxes	$ 10

X

- Definition

Other comprehensive income foreign currency translation adjustment tax expense.

+ References

No definition available.

+ Details

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Namespace Prefix:	hca_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

OtherComprehensiveIncomeUnrealizedHoldingLossOnDebtSecuritiesArisingDuringPeriodTaxExpense

+ References

No definition available.

+ Details

Name:	hca_Othercomprehensiveincomeunrealizedholdinglossondebtsecuritiesarisingduringperiodtaxexpense
Namespace Prefix:	hca_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_EquityAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration