Investments of Insurance Subsidiaries - Additional Information (Detail)	6 Months Ended
Jun. 30, 2022
Investments, Debt and Equity Securities [Abstract]
Available for sale securities expected maturity of debt securities	6 years
Available for sale securities average scheduled maturity	9 years

Available for sale securities expected maturity of debt securities (in years).

No definition available.

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