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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.