v2.4.0.6

General (Details) (USD $)	3 Months Ended
	Mar. 31, 2013 Terminals mi	Mar. 31, 2013 Kinder Morgan Energy Partners, L.P. [Member]	Mar. 31, 2013 El Paso Corporation [Member]	Mar. 31, 2013 Kinder Morgan Energy Partners, L.P. [Member]	Dec. 31, 2012 Rockies Express Pipeline LLC [Member] KMP’s FTC Natural Gas Pipelines [Member]	Nov. 01, 2012 Energy Transfers Partners LP [Member] KMP’s FTC Natural Gas Pipelines [Member]
Schedule of Equity Method Investments [Line Items]
Enterprise Market Value	$ 115,000,000,000
Miles of pipeline	73,000
Number of pipeline terminals	180
Ownership interest		11.00%			50.00%
Limited partnership ownership percentage	41.00%
General partnership ownership interest	2.00%
Percentage of ownership to classify as equity method investment	50.00%
Indemnification of KMP debt			470,000,000	5,900,000,000
Proceeds from sale of disposal group						1,800,000,000
Business Acquisition, Purchase Price Allocation, Liabilities Assumed						$ 3,300,000,000

X

- Definition

Enterprise Market Value

+ References

No definition available.

+ Details

Name:	kmi_EnterpriseMarketValue
Namespace Prefix:	kmi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Equity Investment, Classify as Equity Method, Percentage

+ References

No definition available.

+ Details

Name:	kmi_EquityInvestmentClassifyAsEquityMethodPercentage
Namespace Prefix:	kmi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Indemnification Of Debt

+ References

No definition available.

+ Details

Name:	kmi_IndemnificationOfDebt
Namespace Prefix:	kmi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Miles Of Pipeline

+ References

No definition available.

+ Details

Name:	kmi_MilesOfPipeline
Namespace Prefix:	kmi_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number Of Pipeline Terminals Owned Interest In And Or Operated

+ References

No definition available.

+ Details

Name:	kmi_NumberOfPipelineTerminalsOwnedInterestInAndOrOperated
Namespace Prefix:	kmi_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Proceeds from sale of disposal group

+ References

No definition available.

+ Details

Name:	kmi_ProceedsFromSaleOfDisposalGroup
Namespace Prefix:	kmi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of acquisition cost of a business combination allocated to liabilities assumed.

+ References

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

-Publisher FASB

-Name Emerging Issues Task Force (EITF)

-Number 98-1

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 37

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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

X

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 159

-Paragraph 18

-Subparagraph f

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571



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

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 18

-Paragraph 20

-Subparagraph a (1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Name:	us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The number of units or percentage investment held by the managing member or general partner of the LLC or LP.

+ References

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

-Publisher AICPA

-Name Practice Bulletin (PB)

-Number 14

-Paragraph 15

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 272

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055

+ Details

Name:	us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number of units or percentage investment held by one or more members or limited partners of the LLC or LP.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 272

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055

+ Details

Name:	us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

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