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Select Quarterly Financial Data (Detail) - USD ($)
$ / shares in Units, $ 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
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.