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Acquisitions Phantom (Details)	Feb. 01, 2016
BP Terminal Assets
Business Acquisition [Line Items]
Number of terminals wholly owned	1

X

- Definition

Number of terminals wholly owned

+ References

No definition available.

+ Details

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

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=kmi_BPTerminalAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: