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Acquisitions (Acquisition of HST, WHC & MPLXT) (Details)
bbl in Millions, $ in Millions
12 Months Ended
Feb. 01, 2018
Mar. 01, 2017
USD ($)
mi
shares
bbl
Mar. 31, 2016
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
shares
Business Acquisition [Line Items]            
Units, acquisitions           22,993,880
Aggregate percentage of general partner interest 2.00% 2.00% 2.00% 2.00%    
Contribution from MPC | $       $ 1,046 $ 675 $ 225
Number of natural gas liquids storage caverns   8        
Number of light product terminals   62        
Wholly Owned Properties            
Business Acquisition [Line Items]            
Number of light product terminals   59        
Property Subject to Operating Lease            
Business Acquisition [Line Items]            
Number of light product terminals   1        
Partially Owned Properties            
Business Acquisition [Line Items]            
Number of light product terminals   2        
Natural gas liquids storage caverns            
Business Acquisition [Line Items]            
Storage Capacity | bbl   1.8        
Light-product terminal            
Business Acquisition [Line Items]            
Storage Capacity | bbl   23.6        
Crude Oil            
Business Acquisition [Line Items]            
Miles of pipeline | mi   174        
Refined products            
Business Acquisition [Line Items]            
Miles of pipeline | mi   430        
MPC            
Business Acquisition [Line Items]            
Contribution from MPC | $   $ 6 $ 15      
Limited Partners Common Units            
Business Acquisition [Line Items]            
Units, acquisitions           22,534,002
Limited Partners Common Units | MPC            
Business Acquisition [Line Items]            
Contribution from MPC | $       $ 0 $ 0 $ 84
General Partner Units            
Business Acquisition [Line Items]            
Units, acquisitions [1]           459,878
HST & WHC & MPLXT            
Business Acquisition [Line Items]            
Equity interest issued or issuable, value assigned | $   504        
Equity interest issued or issuable, fair value assigned | $   $ 503        
Units, acquisitions         13,224,873  
HST & WHC & MPLXT | General Partner Common Units            
Business Acquisition [Line Items]            
Units, acquisitions   9,197,900        
HST & WHC & MPLXT | Limited Partners Common Units            
Business Acquisition [Line Items]            
Units, acquisitions         12,960,376  
HST & WHC & MPLXT | Limited Partners Common Units | MPLX Logistics LLC            
Business Acquisition [Line Items]            
Units, acquisitions   2,630,427        
HST & WHC & MPLXT | Limited Partners Common Units | MPLX Holdings Inc            
Business Acquisition [Line Items]            
Units, acquisitions   1,132,049        
HST & WHC & MPLXT | General Partner Units            
Business Acquisition [Line Items]            
Units, acquisitions   264,497     264,497 [1]  
HST & WHC & MPLXT | Cash and Cash Equivalents [Member]            
Business Acquisition [Line Items]            
Payments to Acquire Businesses, Gross | $   $ 1,500        
[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.