Employee Benefit Plans - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Contribution Benefit Plans [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Percentage of employer contribution to match participant contribution in defined contribution plan, net	100.00%
Benefits expense of defined benefit plans	$ 606	$ 560	$ 552
Defined benefit plan cost (credit)	(11)	4	8
Defined benefit plan, assets	$ 9
Defined benefit plan obligation		9
Defined Contribution Benefit Plans [Member] \| Minimum [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Percentage of employer contribution to match participant contribution in defined contribution plan	3.00%
Defined Contribution Benefit Plans [Member] \| Maximum [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Percentage of employer contribution to match participant contribution in defined contribution plan	9.00%
Restoration Plan [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Number of hours of service required to qualify for the plan	1,000 or more
Noncontributory and nonqualified plan, benefit expense	$ (27)	38	35
Noncontributory and nonqualified plan, accrued benefits liabilities	210	258
Supplemental Executive Retirement Plan [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Defined benefit plan cost (credit)	22	22	$ 24
Defined benefit plan obligation	$ 137	$ 201

Defined benefit plan accumulated cost asset.

No definition available.

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Namespace Prefix:	hca_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

No of hours of service required to qualify for the plan.

+ References

No definition available.

+ Details

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

- Definition

Noncontributory, nonqualified plan, accumulated benefit obligation.

+ References

No definition available.

+ Details

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Namespace Prefix:	hca_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Noncontributory, nonqualified plan, benefit cost.

+ References

No definition available.

+ Details

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

- Definition

Pension Plans, Postretirement and Other Employee Benefits [Line Items]

+ References

No definition available.

+ Details

Name:	hca_PensionPlansPostretirementAndOtherEmployeeBenefitsLineItems
Namespace Prefix:	hca_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (e)
-URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

+ Details

Name:	us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of net periodic benefit cost (credit) for defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 6
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e2709-114920

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
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-Publisher FASB
-Name Accounting Standards Codification
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-Publisher FASB
-Name Accounting Standards Codification
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-URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage employer matches of the employee's percentage contribution matched.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Period Type:	duration

- Details

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- Details

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- Details

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- Details

Name:	us-gaap_RetirementPlanTypeAxis=hca_RestorationPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: