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Select Quarterly Financial Data (Detail) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
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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
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues and other income |  | $ 1,715 | $ 1,712 | $ 1,578 | $ 1,420 | $ 1,085 | $ 980 | $ 916 | $ 886 | $ 6,425 |  | $ 3,867 |  | $ 3,029 |
Income from operations |  | 666 | 672 | 608 | 557 | 335 | 311 | 280 | 265 | 2,503 |  | 1,191 |  | 683 |
Net income |  | 439 | 516 | 456 | 423 | 241 | 217 | 191 | 187 | 1,834 |  | 836 |  | 434 |
Net income (loss) attributable to MPLX LP |  | 434 | 510 | 453 | 421 | 238 | 216 | 190 | 150 | 1,818 | [1] | 794 | [1] | 233 | [1]
Distributions declared: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total cash distributions declared |  |  |  |  |  |  |  |  |  | 2,060 |  | 1,288 |  | 938 |
Distribution declared, general partner |  |  |  |  |  |  |  |  |  |  |  | (32) |  |  |
Incentive distribution, subsequent distribution amount |  |  |  |  |  |  |  |  |  | 0 |  | 303 |  | 187 |
Total distributions declared |  | $ 534 | $ 526 | $ 517 | $ 483 | $ 362 | $ 336 | $ 311 | $ 279 |  |  |  |  |  |
Limited Partners Common Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to MPLX LP | [1] |  |  |  |  |  |  |  |  | $ 1,743 |  | $ 411 |  | $ 1 |
Net income (loss) attributable to MPLX LP per limited partner unit: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common - basic (in USD per unit) |  | $ 0.52 | $ 0.62 | $ 0.55 | $ 0.61 | $ 0.31 | $ 0.29 | $ 0.26 | $ 0.20 | $ 2.29 |  | $ 1.07 |  | $ 0.00 |
Common - diluted (in USD per unit) |  | 0.52 | 0.62 | 0.55 | 0.61 | 0.31 | 0.29 | 0.26 | 0.19 | 2.29 |  | 1.06 |  | $ 0.00 |
Cash distributions declared per limited partner common unit |  | 0.6475 | 0.6375 | 0.6275 | 0.6175 | 0.6075 | 0.5875 | 0.5625 | 0.5400 | $ 2.5300 |  | $ 2.2975 |  |  |
Distributions declared: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total cash distributions declared | [2] |  |  |  |  |  |  |  |  | $ 1,985 |  | $ 895 |  | $ 692 |
Limited Partners Subordinated Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to MPLX LP per limited partner unit: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subordinated - basic and diluted (in USD per unit) |  | $ 0.00 | $ 0.00 | $ 0.00 | $ 0.00 | $ 0.00 | $ 0.00 | $ 0.00 | $ 0.00 |  |  |  |  |  |
Redeemable Preferred Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to MPLX LP |  |  |  |  |  |  |  |  |  | 75 | [1] | 65 | [1] | 41 |
Distributions declared: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total cash distributions declared |  | $ 20 | $ 19 | $ 20 | $ 16 | $ 16 | $ 16 | $ 17 | $ 16 | $ 75 | [2] | 65 | [2] | $ 41 | [2]
Public | Limited Partners Common Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions declared: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total cash distributions declared |  | 187 | 185 | 181 | 179 | 175 | 170 | 162 | 149 |  |  |  |  |  |
Distribution declared, general partner |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |
MPC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions declared: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution declared, general partner |  | 0 | 0 | 0 | 0 | 0 | 7 | 6 | 5 |  |  |  |  |  |
Incentive distribution, subsequent distribution amount |  | 0 | 0 | 0 | 0 | 0 | 81 | 70 | 60 |  |  |  |  |  |
MPC | Limited Partners Common Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions declared: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total cash distributions declared |  | $ 327 | $ 322 | $ 316 | $ 288 | $ 171 | $ 62 | $ 56 | $ 49 |  |  |  |  |  |
Distribution declared, general partner |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |
[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.
[2] | See Note 8 for distribution information.

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