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Acquisitions Acquisitions (Refining Logistics and Fuels Distribution) (Details) bbl in Millions, $ in Millions |  |  |  |  | 3 Months Ended | 11 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 01, 2018 USD ($) Tank shares bbl | Sep. 01, 2017 USD ($) shares | Mar. 01, 2017 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) shares
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Partners' Capital Account, Units, Acquisitions | shares |  |  |  |  |  |  |  |  |  | 22,993,880
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest |  | 2.00% |  | 2.00% | 2.00% |  |  | 2.00% |  |
Contribution from MPC |  |  |  |  |  |  |  | $ 1,046.0 | $ 675.0 | $ 225.0
Property, plant and equipment, net |  |  |  |  |  | $ 12,187.0 | $ 14,639.0 | 14,639.0 | 12,187.0 |
Goodwill |  |  |  |  |  | 2,245.0 | 2,586.0 | $ 2,586.0 | 2,245.0 | $ 2,245.0
Number of storage tanks | Tank |  | 619 |  |  |  |  |  |  |  |
Number of rail and truck racks |  | 32 |  |  |  |  |  |  |  |
Number of docks and gasoline blenders |  | 18 |  |  |  |  |  |  |  |
Refining Logistics & Fuels Distribution [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual |  |  |  |  |  |  | 1,359.0 |  |  |
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual |  |  |  |  |  |  | $ 874.0 |  |  |
Payments to Acquire Businesses, Gross |  | $ 4,100.0 |  |  |  |  |  |  |  |
Partners' Capital Account, Units, Acquisitions | shares |  |  |  |  |  |  |  | 113,888,889 |  |
Equity interest issued or issuable, fair value assigned |  | 4,300.0 |  |  |  |  |  |  |  |
Business Acquisition, Total Consideration, Fair Value Assigned |  | 8,400.0 |  |  |  |  |  |  |  |
Property, plant and equipment, net |  | 830.0 |  |  |  |  |  |  |  |
Refining Logistics [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill |  | 85.0 |  |  |  |  |  |  |  |
Fuels Distribution [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill |  | $ 130.0 |  |  |  |  |  |  |  |
Limited Partners Common Units |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Partners' Capital Account, Units, Acquisitions | shares |  |  |  |  |  |  |  |  |  | 22,534,002
Limited Partners Common Units | Refining Logistics & Fuels Distribution [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Partners' Capital Account, Units, Acquisitions | shares |  |  |  |  |  |  |  | 111,611,111 |  |
Limited Partners Common Units | MPLX LP [Member] | Refining Logistics & Fuels Distribution [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Partners' Capital Account, Units, Acquisitions | shares |  | 111,611,111 |  |  |  |  |  |  |  |
Limited Partners Common Units | MPLX Logistics LLC | Refining Logistics & Fuels Distribution [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Partners' Capital Account, Units, Acquisitions | shares |  | 18,176,666 |  |  |  |  |  |  |  |
Limited Partners Common Units | MPLX Holdings Inc | Refining Logistics & Fuels Distribution [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Partners' Capital Account, Units, Acquisitions | shares |  | 7,824,167 |  |  |  |  |  |  |  |
General Partner Units |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Partners' Capital Account, Units, Acquisitions | shares | [1] |  |  |  |  |  |  |  |  | 459,878
General Partner Units | Refining Logistics & Fuels Distribution [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Partners' Capital Account, Units, Acquisitions | shares | [1] |  |  |  |  |  |  | 2,277,778 |  |
General Partner Units | MPLX LP [Member] | Refining Logistics & Fuels Distribution [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Partners' Capital Account, Units, Acquisitions | shares |  | 2,277,778 |  |  |  |  |  |  |  |
General Partner Common Units | Refining Logistics & Fuels Distribution [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Partners' Capital Account, Units, Acquisitions | shares |  | 85,610,278 |  |  |  |  |  |  |  |
LOOP LOCAP SAX and Explorer |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Partners' Capital Account, Units, Acquisitions | shares |  |  |  |  |  |  |  | 264,413,309 |  |
Equity interest issued or issuable, fair value assigned |  |  | $ 653.0 |  |  |  |  |  |  |
Business Acquisition, Total Consideration, Fair Value Assigned |  |  | $ 1,070.0 |  |  |  |  |  |  |
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest |  |  | 2.00% |  |  |  |  |  |  |
LOOP LOCAP SAX and Explorer | Limited Partners Common Units | MPLX Logistics LLC |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Partners' Capital Account, Units, Acquisitions | shares |  |  | 3,350,893 |  |  |  |  |  |  |
LOOP LOCAP SAX and Explorer | Limited Partners Common Units | MPLX Holdings Inc |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Partners' Capital Account, Units, Acquisitions | shares |  |  | 1,441,224 |  |  |  |  |  |  |
LOOP LOCAP SAX and Explorer | General Partner Units |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Partners' Capital Account, Units, Acquisitions | shares |  |  | 377,778 |  |  |  |  |  |  |
LOOP LOCAP SAX and Explorer | General Partner Common Units |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Partners' Capital Account, Units, Acquisitions | shares |  |  | 13,719,017 |  |  |  |  |  |  |
Marathon Petroleum Corporation [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Contribution from MPC |  |  |  | $ 6.0 | $ 15.0 |  |  |  |  |
Marathon Petroleum Corporation [Member] | Refining Logistics & Fuels Distribution [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Contribution from MPC |  | $ 23.7 |  |  |  |  |  |  |  |
Marathon Petroleum Corporation [Member] | Limited Partners Common Units |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Contribution from MPC |  |  |  |  |  |  |  | $ 0.0 | $ 0.0 | $ 84.0
Marathon Petroleum Corporation [Member] | LOOP LOCAP SAX and Explorer |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Contribution from MPC |  |  |  |  |  | $ 10.0 |  |  |  |
Crude Oil |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Storage Capacity | bbl |  | 56 |  |  |  |  |  |  |  |
[1] | Changes to the number of general partner units outstanding, other than changes due to contributions made to MPC for the acquisitions of HSM, HST, WHC, MPLXT, the Joint-Interest Acquisition and Refining Logistics and Fuels Distribution, are the result of cash contributions made by the general partner in order to maintain its two percent GP Interest.

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