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Guarantee of Securities of Subsidiaries Guarantee of Securities of Subsidiaries (Details) $ in Millions	Dec. 31, 2018 USD ($)
Parent Issuer and Guarantor
Total debt - KMI and Subsidiaries	$ 15,192
Subsidiary Issuer and Guarantor - KMP
Total debt - KMI and Subsidiaries	17,910
Subsidiary Guarantors
Total debt - KMI and Subsidiaries	2,535
Capitalized Lease Debt Not Subject to Cross Guarantee Agreement	$ 159

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- Definition

Capitalized Lease Debt Not Subject to Cross Guarantee Agreement

+ References

No definition available.

+ Details

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

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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

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- Details

Name:	srt_ConsolidatedEntitiesAxis=srt_ParentCompanyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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- Details

Name:	srt_ConsolidatedEntitiesAxis=kmi_KMPMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ConsolidatedEntitiesAxis=kmi_GuarantorSubsidiariesOtherMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: