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Consolidated Statements of Comprehensive Income Statement - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Statement of Comprehensive Income [Abstract]      
Net income $ 4,952 $ 4,357 $ 3,966
Other comprehensive income, net of tax:      
Remeasurements of pension and other postretirement benefits related to equity method investments, net of tax 8 1 4
Comprehensive income 4,960 4,358 3,970
Less comprehensive income attributable to:      
Noncontrolling interests 40 40 38
Comprehensive income attributable to MPLX LP $ 4,920 $ 4,318 $ 3,932