Business acquisition percent of consideration through equity issuance

No definition available.

Name:	kmr_BusinessAcquisitionPercentConsiderationEquity
Namespace Prefix:	kmr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Business acquisition, unit exchange ratio

+ References

No definition available.

+ Details

Name:	kmr_BusinessAcquisitionUnitExchangeRatio
Namespace Prefix:	kmr_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

Equity investee's equity interest of investment included in asset disposal group related to verbal agreement with the U.S. Federal Trade Commission to receive regulatory approval for related party's acquisition.

+ References

No definition available.

+ Details

Name:	kmr_EquityInvesteesEquityInterestOfInvestmentIncludedInAssetDisposalGroup
Namespace Prefix:	kmr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Miles of pipe of combined entity

+ References

No definition available.

+ Details

Name:	kmr_MilesOfPipeOfCombinedEntity
Namespace Prefix:	kmr_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number Of Pipeline Terminals Owned Interest In And Or Operated

+ References

No definition available.

+ Details

Name:	kmr_NumberOfPipelineTerminalsOwnedInterestInAndOrOperated
Namespace Prefix:	kmr_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 51

-Subparagraph d

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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_BusinessAcquisitionCostOfAcquiredEntityPurchasePrice
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- 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

- 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

- 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

- Definition

The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3179-108585

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 15, 16

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

- Details

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

General (Details) (USD $) In Billions, unless otherwise specified	12 Months Ended			12 Months Ended			12 Months Ended
	Dec. 31, 2012 Rockies Express [Member]	Dec. 31, 2012 El Paso Natural Gas [Member]	Dec. 31, 2012 KMP [Member]	Dec. 31, 2012 El Paso [Member] Kinder Morgan Inc [Member]	Aug. 01, 2012 Tennessee Gas Pipeline [Member]	Jan. 29, 2013 Significant Acquisitions and Disposals, Transaction [Domain] Copano Energy LLC [Member] KMP [Member]	Dec. 31, 2012 KMP's FTC Disposal Group [Member] Kinder Morgan Inc [Member]
Significant Acquisitions and Disposals [Line Items
Limited partners, ownership interest				41.00%
General partner, ownership interest				2.00%
Miles of pipe of combined entity				75,000
Number of pipeline terminals				180
Proceeds from Divestiture of Businesses							$ 1.8
Equity investees equity interest of investment included in asset disposal group	50.00%	50.00%
Business Acquisition, Cost of Acquired Entity, Purchase Price					$ 6.2	$ 5.0
Equity Method Investment, Ownership Percentage			30.80%
Business acquisition percent consideration equity						100.00%
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares						0.4563