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Derivative Financial Instruments (Tables)
 9 Months Ended
Sep. 30, 2025
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Derivative Instruments, Gain (Loss) The impact of MPLX’s derivative contracts not designated as hedging instruments and the location of gains and losses recognized in the Consolidated Statements of Income is summarized below:
Three Months Ended 
September 30,		Nine Months Ended 
September 30,
(In millions)2025202420252024
Product sales
Realized gain$— $1 $— $1 
Unrealized gain— 3 — 1 
Product sales derivative gain/(loss)— 4 — 2 
Purchased product costs
Realized loss(2)(3)(8)(10)
Unrealized gain/(loss)4 — 7 (8)
Purchased product cost derivative gain/(loss)2 (3)(1)(18)
Total derivative gain/(loss) included in Net income$2 $1 $(1)$(16)