XML 67 R50.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Summary of Significant Accounting Policies Property, Plant and Equipment (Details) | 12 Months Ended
--- | ---
Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Composite depreciation rate, low | 1.01%
Composite depreciation rate, high | 23.00%

X
- 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

X
- 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

X
- References No definition available. + Details
Name: | us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration