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Investments of Insurance Subsidiaries - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2017
Investments, Debt and Equity Securities [Abstract]
Available for sale securities expected maturity of debt securities	4 years
Available for sale securities average scheduled maturity	5 years 6 months

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- Definition

Available-for-sale securities average scheduled maturity period.

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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

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- References

No definition available.

+ Details

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