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Equity-Based Compensation Plan | 6 Months Ended
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Jun. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Equity-Based Compensation Plan | Equity-Based Compensation Phantom Units – The following is a summary of phantom unit award activity of MPLX LP common units for the six months ended June 30, 2017:
| Number of Units |  | Weighted Average Fair Value
Outstanding at December 31, 2016 | 1,173,411 |  |  | $ | 33.09 |
Granted | 529,434 |  |  | 36.86 |
Settled | (268,154 | ) |  | 33.47 |
Forfeited | (62,852 | ) |  | 34.66 |
Outstanding at June 30, 2017 | 1,371,839 |  |  | 34.40 |
Performance Units – The Partnership grants performance units under the MPLX LP 2012 Incentive Compensation Plan to certain officers of the general partner and certain eligible MPC officers who make significant contributions to its business. These performance units pay out 75 percent in cash and 25 percent in MPLX LP common units. The performance units paying out in units are accounted for as equity awards. The performance units granted in 2017 are hybrid awards having a three-year performance period of January 1, 2017 through December 31, 2019. The payout of the award is dependent on two independent conditions, each constituting 50 percent of the overall target units granted. The awards have a performance condition based on MPLX LP’s distributable cash flow during the last twelve months of the performance period, and a market condition based on MPLX LP’s total unitholder return over the entire three-year performance period. The market condition was valued using a Monte Carlo valuation, with the result being combined with the expected payout of the performance condition as of the grant date, resulting in a grant date fair value of $0.90 for the 2017 equity-classified performance units. The following is a summary of the equity-classified performance unit award activity for the six months ended June 30, 2017:
| Number of Units
Outstanding at December 31, 2016 | 1,799,249 |
Granted | 1,407,062 |
Settled | (464,500 | )
Forfeited | (15,312 | )
Outstanding at June 30, 2017 | 2,726,499 |

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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