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Supplemental Cash Flow Information - Summary of Supplemental Cash Flow Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Supplemental Cash Flow Information [Abstract] |  |  |  |  |
Interest paid (net of amounts capitalized) |  | $ 913 |  | $ 940 | $ 893
Income taxes paid |  | 7 |  | 6 | 7
Payments on operating leases |  | 64 |  | 71 | 71
Principal payments under finance lease obligations |  | 2 |  | 1 | 1
Non-cash investing and financing activities: |  |  |  |  |
Transfers of property, plant and equipment to lease receivable |  | 0 |  | 0 | (8)
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 | 0
Book Value of Equity Method Investment | [1] | 282 |  | 4 | 311
Contribution of Net Assets |  | 115 | [2] | 0 | 0
Business Combination, Fair Value of Contingent Consideration at Acquisition Date |  | $ 234 | [3],[4] | $ 0 | $ 0
Other Significant Noncash Transaction, Consideration Given |  | 24 |  | — | —
[1] | 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.
[2] | Represents the book value of assets contributed by MPLX to a joint venture.
[3] | Liability recorded in the third quarter of 2025 related to the BANGL Acquisition earnout provision.
[4] | See Note 4 – BANGL, LLC Acquisitions.

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