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Long-Term Debt - Schedule of Long-Term Debt (Parenthetical) (Detail)	3 Months Ended
	Mar. 31, 2018
Debt Instrument [Line Items]
Total debt average term	6 years 7 months 6 days
Total debt average rate	5.20%
Senior Secured Asset-Based Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Effective interest rate	3.30%
Senior Secured Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Effective interest rate	3.40%
Senior Secured Term Loan Facilities [Member]
Debt Instrument [Line Items]
Effective interest rate	3.50%
Senior Secured Notes [Member]
Debt Instrument [Line Items]
Effective interest rate	5.40%
Other Senior Secured Debt [Member]
Debt Instrument [Line Items]
Effective interest rate	5.80%
Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Effective interest rate	6.40%

X

- Definition

Long-term debt average term.

+ References

No definition available.

+ Details

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Namespace Prefix:	hca_
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Balance Type:	na
Period Type:	duration

X

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

+ Details

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Definition

Weighted average interest rate of long-term debt outstanding calculated at point in time.

+ References

No definition available.

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- Details

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- Details

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- Details

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- Details

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