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Consolidated Balance Sheets - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Assets    
Cash and cash equivalents $ 1,765 $ 1,519
Receivables, less allowance for expected credit loss 729 718
Inventories 175 180
Assets held for sale 1,034 0
Other current assets 38 29
Total current assets 4,595 3,276
Equity method investments 4,792 4,531
Property, plant and equipment, net 21,348 19,154
Intangibles, net 1,443 518
Goodwill 8,732 7,645
Right of use assets, net 276 273
Other noncurrent assets 1,058 994
Total assets 43,227 37,511
Liabilities    
Accounts payable 131 147
Accrued liabilities 261 295
Accrued property, plant and equipment 400 208
Long-term debt due within one year 1,501 1,693
Accrued interest payable 273 244
Operating lease liabilities 49 45
Liabilities held for sale 230 0
Total current liabilities 3,502 3,235
Long-term deferred revenue 121 317
Long-term debt 24,145 19,255
Deferred income taxes 20 18
Long-term operating lease liabilities 220 217
Total liabilities 28,703 23,501
Commitments and contingencies (see Note 16)
Series A Preferred Units 0 203
Equity    
Accumulated other comprehensive income (loss) 5 (3)
Total MPLX LP partners’ capital 14,296 13,576
Noncontrolling interests 228 231
Total equity 14,524 13,807
Total liabilities, preferred units and equity 43,227 37,511
Related Party [Member]    
Assets    
Receivables, less allowance for expected credit loss 592 620
Current assets - related parties 854 830
Other current assets 2 1
Right of use assets, net 223 226
Noncurrent assets - related parties 983 1,120
Liabilities    
Operating lease liabilities 1 2
Other current liabilities 393 396
Long-term deferred revenue 117 110
Long-term liabilities - related parties 339 334
Equity    
Limited Partners' Capital Account 4,778 4,257
Nonrelated Party [Member]    
Liabilities    
Other current liabilities 264 207
Long-term liabilities - related parties 356 125
Equity    
Limited Partners' Capital Account $ 9,513 $ 9,322