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Supplemental Cash Flow Information (Tables) | 12 Months Ended
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Dec. 31, 2025
Supplemental Cash Flow Information [Abstract] |
Summary of Supplemental Cash Flow Information |
(In millions) |  | 2025 |  | 2024 |  | 2023
Net cash provided by operating activities included: |  |  |  |  |  |
Interest paid (net of amounts capitalized) |  | $ | 913 |  |  | $ | 940 |  |  | $ | 893 |
Income taxes paid |  | 7 |  |  | 6 |  |  | 7 |
Cash paid for amounts included in the measurement of lease liabilities: |  |  |  |  |  |
Payments on operating leases |  | 64 |  |  | 71 |  |  | 71 |
Net cash provided by financing activities included: |  |  |  |  |  |
Principal payments under finance lease obligations |  | 2 |  |  | 1 |  |  | 1 |
Non-cash investing and financing activities: |  |  |  |  |  |
Net transfers of property, plant and equipment to materials and supplies inventories |  | — |  |  | — |  |  | (8) |
Contribution of assets(1) |  | 115 |  |  | — |  |  | — |
ROU assets obtained in exchange for new operating lease obligations |  | 53 |  |  | 47 |  |  | 21 |
ROU assets obtained in exchange for new finance lease obligations |  | 3 |  |  | 1 |  |  | — |
Book value of equity method investment(2) |  | 282 |  |  | 4 |  |  | 311 |
Contingent consideration(3) |  | 234 |  |  | — |  |  | — |
Other |  | 24 |  |  | — |  |  | — |
(1) Represents the book value of assets contributed by MPLX to a joint venture. (2) Represents the book value of MPLX’s equity method investment in BANGL in 2025, OCC in 2024 and Torñado in 2023 prior to MPLX buying out the remaining interest in these entities. See Note 4 for additional information. (3) See Note 4 – BANGL, LLC Acquisitions.
Summary of Reconciliation of Additions to Property, Plant and Equipment to Total Capital Expenditures [Table Text Block] | The Consolidated Statements of Cash Flows exclude changes to the Consolidated Balance Sheets that did not affect cash. The following is a reconciliation of additions to property, plant and equipment to total capital expenditures:
(In millions) |  | 2025 |  | 2024 |  | 2023
Additions to property, plant and equipment |  | $ | 1,808 |  |  | $ | 1,056 |  |  | $ | 937 |
Increase/(decrease) in capital accruals |  | 170 |  |  | (6) |  |  | 82 |
Other |  | (22) |  |  | — |  |  | — |
Total capital expenditures |  | $ | 1,956 |  |  | $ | 1,050 |  |  | $ | 1,019 |

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