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Consolidated Balance Sheets - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Assets, Current [Abstract]    
Cash and cash equivalents $ 2,137 $ 1,519
Receivables, less allowance for expected credit loss 735 718
Inventories 172 180
Other current assets 51 29
Total current assets 3,994 3,276
Equity method investments 4,798 4,531
Property, plant and equipment, net 21,698 19,154
Intangibles, net 1,397 518
Goodwill 8,755 7,645
Right of use assets, net 276 273
Other noncurrent assets 1,125 994
Total assets 43,005 37,511
Liabilities, Current [Abstract]    
Accounts payable 108 147
Accrued liabilities 254 295
Accrued property, plant and equipment 438 208
Long-term debt due within one year 1,502 1,693
Accrued interest payable 354 244
Total current liabilities 3,249 3,235
Long-term deferred revenue 119 317
Long-term debt 24,151 19,255
Deferred income taxes 25 18
Long-term operating lease liabilities 217 217
Total liabilities 28,477 23,501
Commitments and contingencies (see Note 22)
Series A Preferred Units 0 203
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]    
Accumulated other comprehensive income (loss) 5 (3)
Total MPLX LP partners’ capital 14,301 13,576
Noncontrolling interests 227 231
Total equity 14,528 13,807
Total liabilities, preferred units and equity 43,005 37,511
Related Party    
Assets, Current [Abstract]    
Receivables, less allowance for expected credit loss 624 620
Current assets - related parties 899 830
Other current assets 1 1
Right of use assets, net 239 226
Noncurrent assets - related parties 962 1,120
Liabilities, Current [Abstract]    
Operating lease liabilities 2 2
Other Liabilities, Current 399 396
Other Long-term Liabilities 364 334
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]    
Limited Partners' Capital Account 4,845 4,257
Nonrelated Party    
Assets, Current [Abstract]    
Right of use assets, net 276 273
Liabilities, Current [Abstract]    
Operating lease liabilities 53 45
Other Liabilities, Current 141 207
Other Long-term Liabilities 352 125
Long-term operating lease liabilities 217 217
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]    
Limited Partners' Capital Account $ 9,451 $ 9,322