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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 ($)
mi
shares
bbl
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
shares
Business Acquisition [Line Items]          
Aggregate percentage of general partner interest 2.00% 2.00% 2.00%    
Contribution from MPC | $     $ 346 $ 11,980 $ 675
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      
Limited Partners Common Units | MPC          
Business Acquisition [Line Items]          
Contribution from MPC | $     $ 315 $ 0 $ 0
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 | shares         13,224,873
HST & WHC & MPLXT | General Partner Common Units          
Business Acquisition [Line Items]          
Units, acquisitions | shares   9,197,900      
HST & WHC & MPLXT | Limited Partners Common Units          
Business Acquisition [Line Items]          
Units, acquisitions | shares         12,960,376
HST & WHC & MPLXT | Limited Partners Common Units | MPLX Logistics LLC          
Business Acquisition [Line Items]          
Units, acquisitions | shares   2,630,427      
HST & WHC & MPLXT | Limited Partners Common Units | MPLX Holdings Inc          
Business Acquisition [Line Items]          
Units, acquisitions | shares   1,132,049      
HST & WHC & MPLXT | General Partner Units          
Business Acquisition [Line Items]          
Units, acquisitions | shares   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.