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Related Party Agreements and Transactions
 9 Months Ended
Sep. 30, 2025
Related Party Transactions [Abstract]  
Related Party Agreements and Transactions Related Party Agreements and Transactions
MPLX engages in transactions with both MPC and certain of its equity method investments as part of its normal business; however, transactions with MPC make up the majority of MPLX’s related party transactions. Transactions with related parties are further described below.
MPLX has various long-term, fee-based commercial agreements with MPC. Under these agreements, MPLX provides transportation, gathering, terminal, fuels distribution, marketing, storage, management, operational and other services to MPC. MPC has committed to provide MPLX with minimum quarterly throughput volumes on crude oil and refined products and other fees for storage capacity; operating and management fees; and reimbursements for certain direct and indirect costs. MPC has also committed to provide a fixed fee for 100 percent of available capacity for boats, barges and third-party chartered equipment under the marine transportation service agreements. In addition, MPLX has obligations to MPC for services provided to MPLX by MPC under omnibus and employee services agreements as well as various other agreements. MPLX also had a keep-whole commodity agreement with MPC under which MPC paid us a processing fee for NGLs related to keep-whole agreements and we paid MPC a marketing fee in exchange for assuming the commodity risk. This agreement expired in March 2025.
Related Party Loan
MPLX is party to a loan agreement (the “MPC Loan Agreement”) with MPC. Under the terms of the MPC Loan Agreement, MPC extends loans to MPLX on a revolving basis as requested by MPLX and as agreed to by MPC. The borrowing capacity of the MPC Loan Agreement is $1.5 billion aggregate principal amount of all loans outstanding at any one time. The MPC Loan Agreement is scheduled to expire, and borrowings under the loan agreement are scheduled to mature and become due and payable, on July 31, 2029, provided that MPC may demand payment of all or any portion of the outstanding principal amount of the loan, together with all accrued and unpaid interest and other amounts (if any), at any time prior to maturity. Borrowings under the MPC Loan Agreement bear interest at one-month term SOFR adjusted upward by 0.10 percent plus 1.25 percent or such lower rate as would be applicable to such loans under the MPLX Credit Agreement as discussed in Note 12.
Activity on the MPC Loan Agreement for the nine months ended September 30, 2025 is summarized in the table below. There was no activity on the MPC Loan Agreement for the nine months ended September 30, 2024.
Nine Months Ended 
September 30,
(In millions, except %)2025
Borrowings$50 
Weighted average interest rate of borrowings5.68 %
Repayments$50 
Outstanding balance at end of period$— 
Related Party Revenue and Other Income
Related party revenue consists primarily of revenue recognized from commercial agreements with MPC as well as fees charged under operating agreements with MPC and our equity affiliates as discussed above.
Certain product sales to MPC and other related parties 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 the three and nine months ended September 30, 2025, these sales totaled $151 million and $476 million, respectively. For the three and nine months ended September 30, 2024, these sales totaled $177 million and $561 million, respectively.
Related Party Expenses
MPC charges MPLX for executive management services and certain general and administrative services provided to MPLX under the terms of our omnibus agreements (“Omnibus charges”), for certain employee services provided to MPLX under employee services agreements (“ESA charges”) and fees paid under co-location agreements and ground lease agreements.
Omnibus charges and ESA charges are classified as Rental cost of sales - related parties, Purchases - related parties, or General and administrative expenses depending on the nature of the asset or activity with which the costs are associated. Additionally, we incur costs under agreements for transportation and processing services with certain of our unconsolidated affiliates.
In addition to these agreements, MPLX purchases products from MPC, makes payments to MPC in its capacity as general contractor to MPLX, and has certain rent and lease agreements with MPC.
For the three and nine months ended September 30, 2025, General and administrative expenses incurred from MPC totaled $80 million and $236 million, respectively. For the three and nine months ended September 30, 2024, General and administrative expenses incurred from MPC totaled $73 million and $217 million, respectively.
Some charges incurred under the omnibus and employee service agreements are related to engineering services and are associated with assets under construction. These charges are added to Property, plant and equipment, net on the Consolidated Balance Sheets. For the three and nine months ended September 30, 2025, these charges totaled $64 million and $159 million, respectively. For the three and nine months ended September 30, 2024, these charges totaled $44 million and $124 million, respectively.
Related Party Assets and Liabilities
Assets and liabilities with related parties appearing in the Consolidated Balance Sheets are detailed in the table below. This table identifies the various components of related party assets and liabilities, including those associated with leases and deferred revenue.
(In millions)September 30,
2025		December 31,
2024
Current assets - related parties
Receivables$592 $620 
Lease receivables247 204 
Prepaid13 5 
Other2 1 
Total854 830 
Noncurrent assets - related parties
Long-term lease receivables483 677 
Right of use assets223 226 
Unguaranteed residual asset241 189 
Long-term receivables36 28 
Total983 1,120 
Current liabilities - related parties
MPC Loan Agreement and other payables(1)
274 288 
Deferred revenue118 106 
Operating lease liabilities1 2 
Total393 396 
Long-term liabilities - related parties
Long-term operating lease liabilities222 224 
Long-term deferred revenue117 110 
Total$339 $334 
(1)    There were no borrowings outstanding on the MPC Loan Agreement as of September 30, 2025 or December 31, 2024.