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Consolidated Statements of Income - USD ($)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Revenues and other income:      
Sales-type lease revenue $ 151 $ 136 $ 136
Sales-type lease revenue, related parties 448 475 500
Income from equity method investments 697 802 600
Total revenues and other income 12,998 11,933 11,281
Costs and expenses:      
Purchases - related parties 1,649 1,583 1,544
Depreciation and amortization 1,351 1,283 1,213
General and administrative expenses 446 427 379
Other taxes 137 131 131
Total costs and expenses 7,055 6,645 6,381
Income from operations 5,943 5,288 4,900
Net interest and other financial costs 983 921 923
Income before income taxes 4,960 4,367 3,977
Other Tax Expense (Benefit) 8 10 11
Net income 4,952 4,357 3,966
Less: Net income attributable to noncontrolling interests 40 40 38
Limited partners’ interest in net income attributable to MPLX LP $ 4,912 $ 4,290 $ 3,829
Net income attributable to MPLX LP per limited partner unit:      
Common - basic $ 4.82 $ 4.21 $ 3.80
Common - diluted $ 4.82 $ 4.21 $ 3.80
Weighted average limited partner units outstanding:      
Common - basic 1,019 1,016 1,001
Common - diluted 1,019 1,017 1,002
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent [1] $ 4,912 $ 4,317 $ 3,928
Equity Interest in Acquiree, Remeasurement Gain 484 20 92
Nonrelated Party      
Revenues and other income:      
Rental Income 260 251 243
Sales-type lease revenue 151 136 136
Other Income 179 50 34
Costs and expenses:      
Rental cost of sales 80 82 82
Related Party      
Revenues and other income:      
Rental Income 889 853 822
Sales-type lease revenue, related parties 448 475 500
Other Income 164 157 121
Costs and expenses:      
Rental cost of sales 16 18 33
Service [Member]      
Revenues and other income:      
Revenue from Contract with Customer, Excluding Assessed Tax, Third parties 2,899 2,770 2,539
Revenue from Contract with Customer, Excluding Assessed Tax, Related Parties 4,393 4,180 3,985
Product [Member]      
Revenues and other income:      
Revenue from Contract with Customer, Excluding Assessed Tax, Third parties 2,002 1,657 1,665
Revenue from Contract with Customer, Excluding Assessed Tax, Related Parties 143 225 250
Oil and Gas, Refining and Marketing [Member]      
Costs and expenses:      
Cost of revenues (excludes items below) 1,561 1,560 1,401
Natural Gas, Midstream [Member]      
Costs and expenses:      
Purchased product costs 1,815 1,561 1,598
Service, Other [Member]      
Revenues and other income:      
Revenue from Contract with Customer, Excluding Assessed Tax, Third parties 289 357 294
Series A Preferred Stock [Member]      
Costs and expenses:      
Dividends, Preferred Stock 0 27 94
Series B Preferred Stock [Member]      
Costs and expenses:      
Dividends, Preferred Stock $ 0 $ 0 $ 5
[1] Allocation of net income attributable to MPLX LP assumes all earnings for the period have been distributed based on the distribution priorities applicable to the period.