Share Repurchase Transactions and Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Parenthetical) (Detail) $ in Millions	9 Months Ended
Sep. 30, 2023 USD ($)
Equity [Abstract]
Unrealized losses on available-for-sale securities, tax benefit	$ 1
Foreign currency translation adjustments, income tax expense	$ 1

Other comprehensive income unrealized holding loss on debt securities arising during period tax benefit.

No definition available.

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