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MPLX LP - Dropdowns to MPLX (Details) - MPLX LP - USD ($) shares in Thousands, $ in Millions | Mar. 01, 2017 | Sep. 01, 2016 | Mar. 31, 2016
--- | --- | --- | ---
Noncontrolling Interest [Line Items] |  |  |
Total fair value of consideration transferred | $ 2,000 |  |
Cash and Cash Equivalents |  |  |
Noncontrolling Interest [Line Items] |  |  |
Payments to acquire business, gross | $ 1,500 |  |
Limited Partner |  |  |
Noncontrolling Interest [Line Items] |  |  |
Units issued, number of units | 13,000 | 7,000 | 23,000
Equity interest issued, value assigned | $ 504 |  | $ 600
General Partner |  |  |
Noncontrolling Interest [Line Items] |  |  |
Units issued, number of units | 264 |  | 460

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