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Related Party Agreements and Transactions (Tables) | 12 Months Ended
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Dec. 31, 2018
Related Party Transactions [Abstract] |
Revenue from Related Parties | Revenue received from related parties related to service, rental, and product sales were as follows:
(In millions) |  | 2018 |  | 2017 |  | 2016
Service revenue |  |  |  |  |  |
MPC |  | $ | 2,159 |  |  | $ | 1,082 |  |  | $ | 936 |
Rental income |  |  |  |  |  |
MPC |  | 718 |  |  | 279 |  |  | 235 |
Product sales(1) |  |  |  |  |  |
MPC |  | $ | 49 |  |  | $ | 8 |  |  | $ | 11 |
(1) | There were additional product sales to MPC that net to zero within the consolidated financial statements as the transactions are recorded net due to the terms of the agreements under which such product was sold. For 2018, 2017, and 2016, these sales totaled $440 million, $254 million and $46 million, respectively
Summary of Fees Received for Operating Pipelines for Related Parties Included in Other Income - Related Parties | MPLX has operating agreements with MPC under which it receives a fee for operating MPC’s retained pipeline assets, a fixed annual fee for providing oversight and management services required to run the marine business and is also reimbursed for personnel services. MPLX also receives management fee revenue for engineering, construction and administrative services for operating certain of its equity method investments. The revenue received from these related parties, included in “Other income - related parties” on the Consolidated Statements of Income, was as follows:
(In millions) |  | 2018 |  | 2017 |  | 2016
MPC |  | $ | 41 |  |  | $ | 40 |  |  | $ | 45 |
MarkWest Utica EMG |  | 17 |  |  | 17 |  |  | 16 |
Ohio Gathering |  | 16 |  |  | 16 |  |  | 15 |
Jefferson Dry Gas |  | 6 |  |  | 6 |  |  | 3 |
Sherwood Midstream |  | 12 |  |  | 8 |  |  | — |
Other |  | 7 |  |  | 5 |  |  | 7 |
Total |  | $ | 99 |  |  | $ | 92 |  |  | $ | 86 |
Schedule of Entity Wide Information Allocated Related Party Omnibus Agreement Costs by Income Stmt Line | MPC provides executive management services and certain general and administrative services to MPLX under the terms of an omnibus agreement. Expenses incurred under this agreement are shown in the table below by the income statement line where they were recorded. Charges for services included in “Purchases - related parties” primarily relate to services that support MPLX’s operations and maintenance activities, as well as compensation expenses. Charges for services included in “General and administrative expenses” primarily relate to services that support MPLX’s executive management, accounting and human resources activities. These charges were as follows:
(In millions) |  | 2018 |  | 2017 |  | 2016
Rental cost of sales - related parties |  | $ | 2 |  |  | $ | 1 |  |  | $ | 1 |
Purchases - related parties |  | 164 |  |  | 67 |  |  | 39 |
General and administrative expenses |  | 68 |  |  | 37 |  |  | 45 |
Total |  | $ | 234 |  |  | $ | 105 |  |  | $ | 85 |
Summary of Related Party Costs Added to Property, Plant and Equipment | Also under terms of the omnibus and employee services agreements, some service costs related to engineering services are associated with assets under construction. These costs added to “Property, plant and equipment, net” were as follows:
(In millions) |  | 2018 |  | 2017 |  | 2016
MPC |  | $ | 151 |  |  | $ | 42 |  |  | $ | 47 |
Summary of Allocated Related Party Employee Benefit Costs by Income Statement Line Item |
(In millions) |  | 2018 |  | 2017 |  | 2016
Rental cost of sales - related parties |  | $ | 3 |  |  | $ | 1 |  |  | $ | — |
Purchases - related parties |  | 528 |  |  | 385 |  |  | 349 |
General and administrative expenses |  | 109 |  |  | 101 |  |  | 100 |
Total |  | $ | 640 |  |  | $ | 487 |  |  | $ | 449 |
Schedule of Entity Wide Information Purchases from Related Parties | Purchases of products from MPC are classified as “Purchases - related parties.” These purchases include product purchases, payments made to MPC in its capacity as general contractor to MPLX, and certain rent and lease agreements. These purchases were as follows:
(In millions) |  | 2018 |  | 2017 |  | 2016
MPC |  | $ | 168 |  |  | $ | 3 |  |  | $ | — |
Receivables from Related Parties | Receivables from related parties were as follows:
|  | December 31,
(In millions) |  | 2018 |  | 2017
MPC |  | $ | 281 |  |  | $ | 153 |
Other |  | 8 |  |  | 7 |
Total |  | $ | 289 |  |  | $ | 160 |
Schedule of Long Term Receivables with Related Parties | Long-term receivables with related parties, which includes straight-line rental income, were as follows:
| December 31,
(In millions) | 2018 |  | 2017
MPC | $ | 24 |  |  | $ | 20 |
Payables to Related Parties | Payables to related parties were as follows:
|  | December 31,
(In millions) |  | 2018 |  | 2017
MPC(1) |  | $ | 131 |  |  | $ | 470 |
MarkWest Utica EMG |  | 51 |  |  | 29 |
Ohio Gathering |  | 5 |  |  | 8 |
Sherwood Midstream |  | 16 |  |  | 8 |
Other |  | — |  |  | 1 |
Total |  | $ | 203 |  |  | $ | 516 |
(1) | Balance includes $386 million related to the MPC Loan Agreement as of December 31, 2017.
Schedule Of Related Party Deferred Revenue Table | The “Deferred revenue-related parties” balance associated with the minimum volume deficiencies and project reimbursements were as follows:
| December 31,
(In millions) | 2018 |  | 2017
Minimum volume deficiencies - MPC | $ | 44 |  |  | $ | 53 |
Project reimbursements - MPC | 50 |  |  | 33 |
Total | $ | 94 |  |  | $ | 86 |

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