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Derivative Financial Instruments (Tables)
3 Months Ended
Mar. 31, 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 
March 31,
(In millions)20252024
Purchased product costs
Realized loss$(3)$(4)
Unrealized loss(4)(8)
Total derivative loss included in Net income$(7)$(12)