Health care organization uninsured revenue.

No definition available.

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

- Definition

Other revenues ratio.

+ References

No definition available.

+ Details

Name:	hca_OtherRevenuesRatio
Namespace Prefix:	hca_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Provision for doubtful accounts ratio.

+ References

No definition available.

+ Details

Name:	hca_ProvisionForDoubtfulAccountsRatio
Namespace Prefix:	hca_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Revenue ratio.

+ References

No definition available.

+ Details

Name:	hca_RevenueRatio
Namespace Prefix:	hca_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Revenues before provision for doubtful accounts ratio.

+ References

No definition available.

+ Details

Name:	hca_RevenuesBeforeProvisionForDoubtfulAccountsRatio
Namespace Prefix:	hca_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Revenues from third party payers.

+ References

No definition available.

+ Details

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

- Details

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

- Definition

Revenues from third party payers ratio.

+ References

No definition available.

+ Details

Name:	hca_RevenuesFromThirdPartyPayersRatio
Namespace Prefix:	hca_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Uninsured revenues ratio.

+ References

No definition available.

+ Details

Name:	hca_UninsuredRevenuesRatio
Namespace Prefix:	hca_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Revenues from the sale of other goods or rendering of other services, not elsewhere specified in the taxonomy; net of (reduced by) sales adjustments, returns, allowances, and discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1(a),(d))

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

+ Details

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

- Definition

Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.5)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 5

-Article 5

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Aggregate revenue during the period for services rendered in the normal course of business (before deducting allowances and discounts) which are not otherwise defined in the taxonomy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1(d))

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

+ Details

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

- Definition

Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1(d))

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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

- Details

Name:	us-gaap_ProductOrServiceAxis=hca_InternationalMember
Namespace Prefix:
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- Details

Name:	us-gaap_ProductOrServiceAxis=hca_ManagedCareAndOtherInsurersMember
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- Details

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Accounting Policies - Schedule of Revenues from Third Party Payers and Uninsured (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues From Third Party Payers [Line Items]
Revenues from third party payers									$ 37,116hca_RevenuesFromThirdPartyPayers	$ 34,109hca_RevenuesFromThirdPartyPayers	$ 33,272hca_RevenuesFromThirdPartyPayers
Uninsured									1,494	2,677	2,580
Other									1,477us-gaap_OtherSalesRevenueNet	1,254us-gaap_OtherSalesRevenueNet	931us-gaap_OtherSalesRevenueNet
Revenues before provision for doubtful accounts									40,087us-gaap_SalesRevenueServicesGross	38,040us-gaap_SalesRevenueServicesGross	36,783us-gaap_SalesRevenueServicesGross
Provision for doubtful accounts									(3,169)us-gaap_ProvisionForDoubtfulAccounts	(3,858)us-gaap_ProvisionForDoubtfulAccounts	(3,770)us-gaap_ProvisionForDoubtfulAccounts
Revenues	9,636us-gaap_SalesRevenueServicesNet	9,220us-gaap_SalesRevenueServicesNet	9,230us-gaap_SalesRevenueServicesNet	8,832us-gaap_SalesRevenueServicesNet	8,836us-gaap_SalesRevenueServicesNet	8,456us-gaap_SalesRevenueServicesNet	8,450us-gaap_SalesRevenueServicesNet	8,440us-gaap_SalesRevenueServicesNet	36,918us-gaap_SalesRevenueServicesNet	34,182us-gaap_SalesRevenueServicesNet	33,013us-gaap_SalesRevenueServicesNet
Revenues from third party payers, Ratio									100.60%hca_RevenuesFromThirdPartyPayersRatio	99.80%hca_RevenuesFromThirdPartyPayersRatio	100.70%hca_RevenuesFromThirdPartyPayersRatio
Uninsured, Ratio									4.00%hca_UninsuredRevenuesRatio	7.80%hca_UninsuredRevenuesRatio	7.80%hca_UninsuredRevenuesRatio
Other, Ratio									4.00%hca_OtherRevenuesRatio	3.70%hca_OtherRevenuesRatio	2.80%hca_OtherRevenuesRatio
Revenues before provision for doubtful accounts, Ratio									108.60%	111.30%	111.30%
Revenues before provision for doubtful accounts, Ratio									108.60%	111.30%	111.30%
Provision for doubtful accounts, Ratio									(8.60%)hca_ProvisionForDoubtfulAccountsRatio	(11.30%)hca_ProvisionForDoubtfulAccountsRatio	(11.30%)hca_ProvisionForDoubtfulAccountsRatio
Revenues ratio from third party payers									100.00%hca_RevenueRatio	100.00%hca_RevenueRatio	100.00%hca_RevenueRatio
Medicare [Member]
Revenues From Third Party Payers [Line Items]
Revenues from third party payers									8,354	7,951	8,292
Revenues from third party payers, Ratio									22.60%	23.30%	25.10%
Managed Medicare [Member]
Revenues From Third Party Payers [Line Items]
Revenues from third party payers									3,614	3,279	2,954
Revenues from third party payers, Ratio									9.80%	9.60%	8.90%
Medicaid [Member]
Revenues From Third Party Payers [Line Items]
Revenues from third party payers									1,848	1,480	1,464
Revenues from third party payers, Ratio									5.00%	4.30%	4.40%
Managed Medicaid [Member]
Revenues From Third Party Payers [Line Items]
Revenues from third party payers									1,923	1,570	1,504
Revenues from third party payers, Ratio									5.20%	4.60%	4.60%
Managed Care and Other Insurers [Member]
Revenues From Third Party Payers [Line Items]
Revenues from third party payers									20,066	18,654	17,998
Revenues from third party payers, Ratio									54.40%	54.60%	54.50%
International (Managed Care and Other Insurers) [Member]
Revenues From Third Party Payers [Line Items]
Revenues from third party payers									$ 1,311	$ 1,175	$ 1,060
Revenues from third party payers, Ratio									3.60%	3.40%	3.20%