Name:	kmi_BusinessCombinationConsiderationTransferredEquityInterestsIssuedandIssuablePercentofTransactionUnitforUnit
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Data Type:	num:percentItemType
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Business Combination, Consideration Transferred, Equity Interests Issued and Issuable,Unit for Unit Exchange Ratio

No definition available.

Name:	kmi_BusinessCombinationConsiderationTransferredEquityInterestsIssuedandIssuableUnitforUnitExchangeRatio
Namespace Prefix:	kmi_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Investments

No definition available.

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

Gas Processing Capacity

No definition available.

Name:	kmi_GasProcessingCapacity
Namespace Prefix:	kmi_
Data Type:	num:volumeItemType
Balance Type:	na
Period Type:	instant

Miles Of Pipeline

No definition available.

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

Natural gas transportation capacity

No definition available.

Name:	kmi_NaturalGasTransportationCapacity
Namespace Prefix:	kmi_
Data Type:	num:volumeItemType
Balance Type:	na
Period Type:	instant

Number of equity method investments acquired

No definition available.

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

Number of Processing Plants

No definition available.

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

Treating Capacity

No definition available.

Name:	kmi_TreatingCapacity
Namespace Prefix:	kmi_
Data Type:	num:volumeItemType
Balance Type:	na
Period Type:	instant

Number of shares of equity interests issued or issuable to acquire entity.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (b)(4)

-URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e6927-128479

Name:	us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_BusinessAcquisitionLineItems
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Data Type:	xbrli:stringItemType
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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463

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

Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination.

No definition available.

Name:	us-gaap_BusinessAcquisitionSharePrice
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 30

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 30

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (b)

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Name:	us-gaap_BusinessCombinationConsiderationTransferred1
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Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination.

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Data Type:	xbrli:monetaryItemType
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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

Percentage of equity in the acquiree held by the acquirer immediately before the acquisition date in a business combination.

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
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Period Type:	instant

In a business combination achieved in stages, this element represents the amount of net gain (loss) recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (g)(2)

-URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463

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Amount of deferred tax liability attributable to taxable temporary differences from goodwill.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 6

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 25

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 740

-Section 25

-Paragraph 9

-URI http://asc.fasb.org/extlink&oid=6912350&loc=d3e9979-128506

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 740

-Section 25

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=6912350&loc=d3e9972-128506

Name:	us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill
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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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 210.5-02.12)

-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 323

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=16385135&loc=d3e33749-111570

Name:	us-gaap_EquityMethodInvestments
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Data Type:	xbrli:monetaryItemType
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Fair value portion of investments accounted under the equity method.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 25

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6903542&loc=d3e32014-111567

Name:	us-gaap_EquityMethodInvestmentsFairValueDisclosure
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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

Remaining amortization period of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.