Share Repurchase Transactions and Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Parenthetical) (Detail) $ in Millions	9 Months Ended
Sep. 30, 2024 USD ($)
Equity [Abstract]
Unrealized gains on available-for-sale securities, tax expense	$ 2
Foreign currency translation adjustments, income tax benefit	$ 8

Other comprehensive income unrealized holding gain on debt securities arising during period tax expense.

No definition available.

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