XML 108 R87.htm IDEA: XBRL DOCUMENT
v3.24.0.1

Share-based Compensation and Employee Benefits - Target Asset Allocation (Details) | Dec. 31, 2023
--- | ---
Pension Benefits | Equities | Minimum |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
Target allocation percentage | 42.00%
Pension Benefits | Equities | Maximum |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
Target allocation percentage | 52.00%
Pension Benefits | Fixed Income Securities | Minimum |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
Target allocation percentage | 37.00%
Pension Benefits | Fixed Income Securities | Maximum |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
Target allocation percentage | 47.00%
Pension Benefits | Real Estate | Minimum |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
Target allocation percentage | 2.00%
Pension Benefits | Real Estate | Maximum |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
Target allocation percentage | 12.00%
Pension Benefits | Company Securities | Minimum |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
Target allocation percentage | 0.00%
Pension Benefits | Company Securities | Maximum |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
Target allocation percentage | 10.00%
OPEB | Cash | Minimum |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
Target allocation percentage | 0.00%
OPEB | Cash | Maximum |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
Target allocation percentage | 23.00%
OPEB | Equities | Minimum |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
Target allocation percentage | 43.00%
OPEB | Equities | Maximum |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
Target allocation percentage | 71.00%
OPEB | Fixed Income Securities | Minimum |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
Target allocation percentage | 26.00%
OPEB | Fixed Income Securities | Maximum |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
Target allocation percentage | 50.00%

X
- Definition Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
Name: | us-gaap_DefinedBenefitPlanPlanAssetsTargetAllocationPercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
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_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=us-gaap_PensionPlansDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_EquitySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_FixedIncomeSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_DefinedBenefitPlanRealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=kmi_CompanySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_CashMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |