XML 130 R89.htm IDEA: XBRL DOCUMENT
v3.25.4

Property, Plant and Equipment (Summary of Property, Plant and Equipment) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, gross | $ 31,759 | $ 28,404 |
Less accumulated depreciation | 10,061 | 9,250 |
Property, plant and equipment, net | 21,698 | 19,154 |
Capitalized interest | 42 | 19 | $ 15
Crude Oil and Products Logistics [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, gross | 13,809 | 13,189 |
Natural Gas & NGL Services [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, gross | 17,950 | 15,215 |
Pipelines And Related Assets [Member] | Crude Oil and Products Logistics [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, gross | 6,908 | 6,627 |
Refining Logistics and related assets [Member] | Crude Oil and Products Logistics [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, gross | 1,990 | 1,867 |
Terminals and related assets [Member] | Crude Oil and Products Logistics [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, gross | 1,869 | 1,726 |
Marine [Member] | Crude Oil and Products Logistics [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, gross | 1,188 | 1,149 |
Land Building Office Equipment And Other [Member] | Crude Oil and Products Logistics [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, gross | 1,627 | 1,619 |
Land Building Office Equipment And Other [Member] | Natural Gas & NGL Services [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, gross | 437 | 541 |
Gas Gathering And Transportation [Member] | Natural Gas & NGL Services [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, gross | 9,379 | 7,789 |
Processing and fractionation [Member] | Natural Gas & NGL Services [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, gross | 6,896 | 6,611 |
Construction-in-progress | Crude Oil and Products Logistics [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, gross | 227 | 201 |
Construction-in-progress | Natural Gas & NGL Services [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, gross | $ 1,238 | $ 274 |
Minimum | Pipelines And Related Assets [Member] | Crude Oil and Products Logistics [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful lives | 15 years |  |
Minimum | Refining Logistics and related assets [Member] | Crude Oil and Products Logistics [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful lives | 15 years |  |
Minimum | Terminals and related assets [Member] | Crude Oil and Products Logistics [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful lives | 15 years |  |
Minimum | Marine [Member] | Crude Oil and Products Logistics [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful lives | 15 years |  |
Minimum | Land Building Office Equipment And Other [Member] | Crude Oil and Products Logistics [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful lives | 5 years |  |
Minimum | Land Building Office Equipment And Other [Member] | Natural Gas & NGL Services [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful lives | 5 years |  |
Minimum | Gas Gathering And Transportation [Member] | Natural Gas & NGL Services [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful lives | 5 years |  |
Minimum | Processing and fractionation [Member] | Natural Gas & NGL Services [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful lives | 10 years |  |
Maximum | Pipelines And Related Assets [Member] | Crude Oil and Products Logistics [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful lives | 50 years |  |
Maximum | Refining Logistics and related assets [Member] | Crude Oil and Products Logistics [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful lives | 20 years |  |
Maximum | Terminals and related assets [Member] | Crude Oil and Products Logistics [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful lives | 40 years |  |
Maximum | Marine [Member] | Crude Oil and Products Logistics [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful lives | 20 years |  |
Maximum | Land Building Office Equipment And Other [Member] | Crude Oil and Products Logistics [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful lives | 50 years |  |
Maximum | Land Building Office Equipment And Other [Member] | Natural Gas & NGL Services [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful lives | 40 years |  |
Maximum | Gas Gathering And Transportation [Member] | Natural Gas & NGL Services [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful lives | 40 years |  |
Maximum | Processing and fractionation [Member] | Natural Gas & NGL Services [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful lives | 40 years |  |

X
- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(8)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(14)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482099/360-10-50-1 + Details
Name: | us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of interest capitalized during the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 835 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483013/835-20-50-1 + Details
Name: | us-gaap_InterestCostsCapitalized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(8)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 360 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482099/360-10-50-1 + Details
Name: | us-gaap_PropertyPlantAndEquipmentGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-7A + Details
Name: | us-gaap_PropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 10 -Topic 360 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482099/360-10-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-7A Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 852 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481372/852-10-55-10 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(8)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 360 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478451/942-360-50-1 + Details
Name: | us-gaap_PropertyPlantAndEquipmentNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=mplx_CrudeOilAndProductsLogisticsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=mplx_NaturalGasAndNGLServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=mplx_PipelinesAndRelatedAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=mplx_RefiningLogisticsAndRelatedAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=mplx_TerminalsandrelatedassetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=mplx_BargesandtowingvesselsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=mplx_LandBuildingOfficeEquipmentAndOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=mplx_GasGatheringAndTransmissionEquipmentAndFacilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=mplx_ProcessingFractionationAndStorageFacilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_AssetUnderConstructionMember
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: |