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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.