Derivative Financial Instruments - Embedded Derivatives in Commodity Contracts (Details) |
3 Months Ended |
|---|---|
Mar. 31, 2026 | |
| Derivative [Line Items] | |
| Description of Embedded Derivative | MPLX has a natural gas purchase commitment embedded in a keep-whole processing agreement with a producer customer in the Southern Appalachia region expiring in December 2027. The customer has the unilateral option to extend the agreement for one five-year term through December 2032. For accounting purposes, the natural gas purchase commitment and the term extending option have been aggregated into a single compound embedded derivative. |
| Derivative, Term of Contract | 5 years |
| Embedded Derivative [Member] | |
| Derivative [Line Items] | |
| Number of Renewals | 1 |
| Derivative, Term of Contract | 5 years |