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Equity (Net Income Allocation) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to MPLX LP | $ 434 | $ 510 | $ 453 | $ 421 | $ 238 | $ 216 | $ 190 | $ 150 | $ 1,818 | [1] | $ 794 | [1] | $ 233 | [1]
Distributions to preferred unitholders |  |  |  |  |  |  |  |  | (75) |  | (65) |  | (41) |
General partner's IDRs and other |  |  |  |  |  |  |  |  |  |  | 310 |  | 191 |
Net income attributable to MPLX LP available to general and limited partners |  |  |  |  |  |  |  |  |  |  | 419 |  | 1 |
General partner's two percent GP Interest in net income attributable to MPLX LP |  |  |  |  |  |  |  |  |  |  | 8 |  | 0 |
General partner's GP Interest in net income attributable to MPLX LP |  |  |  |  |  |  |  |  | $ 0 |  | $ 318 |  | $ 191 |
[1] | Allocation of net income/(loss) attributable to MPLX LP assumes all earnings for the period were distributed based on the current period distribution priorities.

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- Definition Amount of incentive distribution rights earned in cash or stock during the period by a limited partnership general partner, as well as other items to be deducted from net income before calculating the general partner's two percent interest. + References No definition available. + Details
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