Equity-Based Compensation Plan (Tables) |
9 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||
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Sep. 30, 2015 | ||||||||||||||||||||||||||||||||||||||||||||||||||
| Phantom Units [Member] | ||||||||||||||||||||||||||||||||||||||||||||||||||
| Equity Transactions And Share Based Compensation [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] | The following is a summary of phantom unit award activity of MPLX LP common limited partner units for the nine months ended September 30, 2015:
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| Performance Shares [Member] | ||||||||||||||||||||||||||||||||||||||||||||||||||
| Equity Transactions And Share Based Compensation [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] | The following is a summary of the equity-classified performance unit award activity for the nine months ended September 30, 2015:
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