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Summary of Significant Accounting Policies Property, Plant and Equipment (Details) | 12 Months Ended
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Dec. 31, 2017
Property, Plant and Equipment [Line Items] |
Composite depreciation rate, low | 1.09%
Composite depreciation rate, high | 23.00%

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- Definition Composite depreciation rate, high + References No definition available. + Details
Name: | kmi_CompositeDepreciationRateHigh
Namespace Prefix: | kmi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Composite depreciation rate, low + References No definition available. + Details
Name: | kmi_CompositeDepreciationRateLow
Namespace Prefix: | kmi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- 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_PropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration