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Supplemental Cash Flow Information - Summary of Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
 [3]
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Supplemental Cash Flow Elements [Abstract]        
Interest paid (net of amounts capitalized)     $ 705 $ 724
Income taxes paid     3 2
Payments on operating leases     47 53
Principal payments under finance lease obligations     2 1
Transfers of property, plant and equipment to lease receivable     123 108
Contribution of assets(1)     115 [1] 0
ROU assets obtained in exchange for new operating lease obligations     30 34
ROU assets obtained in exchange for new finance lease obligations     3 0
Book value of equity method investment(2)     282 [2] 0
Contingent consideration(3) $ 234 $ 0 $ 234 [3],[4] $ 0
[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, prior to MPLX buying out the remaining interest in the entity. See Note 3 - BANGL, LLC Acquisitions.
[3] Liability recorded in the third quarter of 2025 related to the BANGL Acquisition earnout provision.
[4] See Note 3 - BANGL, LLC Acquisitions.