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Subsequent Event (Details) - Jul. 11, 2015 - MPLX - Partnership - Subsequent Event
$ in Millions
USD ($)
director
shares
Common Units | M & R  
Subsequent Event  
Partnership interest held by counterparty and subject to Voting Agreement (in units) | shares 7,352,691
Partnership interest held by VIE and subject to Voting Agreement (as a percent) 3.84%
Forecast  
Subsequent Event  
Contribution to be made by MPC to MPLX $ 675
Common equity cash consideration 675
Cash termination fee $ 625
Number of directors the Partnership is to identify for MPLX GP's board | director 2
Number of directors the Partnership is to identify for MPC's board | director 1
Period of Lock-Up Agreement 6 months
Forecast | Common Units  
Subsequent Event  
Unit conversion ratio 1.09
Forecast | Class B Units  
Subsequent Event  
Unit conversion ratio 1