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Acquisition of HST, WHC & MPLXT (Details)
bbl in Millions, $ in Millions
3 Months Ended
Sep. 01, 2017
Mar. 01, 2017
USD ($)
mi
shares
bbl
Mar. 31, 2018
USD ($)
shares
Sep. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Business Acquisition [Line Items]          
Units acquired [1]     113,888,889    
General partner ownership interest 2.00% 2.00% 2.00%    
Contribution from MPC | $     $ 1,046   $ 12
Number of natural gas liquids storage caverns   8      
Number of light product terminals   62      
General Partner Units          
Business Acquisition [Line Items]          
Units acquired [1]     2,277,778    
Limited Partners Common Units          
Business Acquisition [Line Items]          
Units acquired [1]     111,611,111    
HST & WHC & MPLXT          
Business Acquisition [Line Items]          
Equity interest issued or issuable, value assigned | $   $ 504      
Equity interest issued or issuable, fair value assigned | $   503      
HST & WHC & MPLXT | Cash and Cash Equivalents [Member]          
Business Acquisition [Line Items]          
Payments to acquire businesses, gross | $   $ 1,500      
HST & WHC & MPLXT | General Partner Units          
Business Acquisition [Line Items]          
Units acquired   264,497      
HST & WHC & MPLXT | General Partner Common Units          
Business Acquisition [Line Items]          
Units acquired   9,197,900      
MPLX Logistics LLC | HST & WHC & MPLXT | Limited Partners Common Units          
Business Acquisition [Line Items]          
Units acquired   2,630,427      
MPLX Holdings Inc | HST & WHC & MPLXT | Limited Partners Common Units          
Business Acquisition [Line Items]          
Units acquired   1,132,049      
Natural gas liquids storage caverns [Member]          
Business Acquisition [Line Items]          
Storage Capacity | bbl   1.8      
Light-product terminal [Member]          
Business Acquisition [Line Items]          
Storage Capacity | bbl   23.6      
Refined Products [Member]          
Business Acquisition [Line Items]          
Miles of pipeline | mi   430      
Crude Oil [Member]          
Business Acquisition [Line Items]          
Miles of pipeline | mi   174      
Wholly Owned Properties [Member]          
Business Acquisition [Line Items]          
Number of light product terminals   59      
Property Subject to Operating Lease [Member]          
Business Acquisition [Line Items]          
Number of light product terminals   1      
Partially Owned Properties [Member]          
Business Acquisition [Line Items]          
Number of light product terminals   2      
MPC          
Business Acquisition [Line Items]          
Contribution from MPC | $   $ 6   $ 10  
[1] MPC agreed to waive approximately one-third of the first quarter 2018 distributions on the common units issued in connection with this transaction. As a result of this waiver, MPC will not receive $23.7 million of the distributions that would have otherwise accrued on such common units with respect to the first quarter 2018. See Note 4 for information regarding this acquisition.