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v3.25.4

Leases Disclosure (Tables) | 12 Months Ended
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Dec. 31, 2025
Leases [Abstract] |
Lease, Cost [Table Text Block] | The components of lease cost were as follows:
| 2025 |  | 2024 |  | 2023
(In millions) | Related Party |  | Third Party |  | Related Party |  | Third Party |  | Related Party |  | Third Party
Components of lease costs: |  |  |  |  |  |  |  |  |  |  |
Operating lease costs | $ | 15 |  |  | $ | 60 |  |  | $ | 14 |  |  | $ | 58 |  |  | $ | 14 |  |  | $ | 56 |
Finance lease cost: |  |  |  |  |  |  |  |  |  |  |
Amortization of ROU assets | — |  |  | 2 |  |  | — |  |  | 1 |  |  | — |  |  | 1 |
Interest on lease liabilities | — |  |  | 1 |  |  | — |  |  | — |  |  | — |  |  | — |
Total finance lease cost | — |  |  | 3 |  |  | — |  |  | 1 |  |  | — |  |  | 1 |
Variable lease cost | 4 |  |  | 14 |  |  | 4 |  |  | 12 |  |  | 4 |  |  | 10 |
Short-term lease cost | 1 |  |  | 70 |  |  | 1 |  |  | 71 |  |  | 1 |  |  | 61 |
Total lease cost | $ | 20 |  |  | $ | 147 |  |  | $ | 19 |  |  | $ | 142 |  |  | $ | 19 |  |  | $ | 128 |
Supplemental Balance Sheet Disclosures [Text Block] | Supplemental balance sheet data related to leases were as follows:
| December 31, 2025 |  | December 31, 2024
(In millions, except % and years) | Related Party |  | Third Party |  | Related Party |  | Third Party
Operating leases |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Right of use assets | $ | 239 |  |  | $ | 276 |  |  | $ | 226 |  | $ | 273
Liabilities |  |  |  |  |  |  |
Operating lease liabilities | 2 |  |  | 53 |  |  | 2 |  | 45
Long-term operating lease liabilities | 237 |  |  | 217 |  |  | 224 |  | 217
Total operating lease liabilities | $ | 239 |  |  | $ | 270 |  |  | $ | 226 |  | $ | 262
Weighted average remaining lease term | 40 years |  | 7 years |  | 42 years |  | 8 years
Weighted average discount rate | 5.8 | % |  | 4.3 | % |  | 5.8 | % |  | 4.2 | %
Finance leases |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Property, plant and equipment, gross |  |  | $ | 12 |  |  |  |  | $ | 10
Less: Accumulated depreciation |  |  | 6 |  |  |  |  | 5
Property, plant and equipment, net |  |  | 6 |  |  |  |  | 5
Liabilities |  |  |  |  |  |  |
Long-term debt due within one year |  |  | 2 |  |  |  |  | 1
Long-term debt |  |  | 4 |  |  |  |  | 5
Total finance lease liabilities |  |  | $ | 6 |  |  |  |  | $ | 6
Weighted average remaining lease term |  |  | 21 years |  |  |  | 22 years
Weighted average discount rate |  |  | 5.8 | % |  |  |  | 6.0 | %
Lessee, Operating Lease, Liability, to be Paid, Maturity | As of December 31, 2025, maturities of lease liabilities for operating lease obligations and finance lease obligations having initial or remaining non-cancellable lease terms in excess of one year are as follows:
(In millions) | Related Party Operating Leases |  | Third Party Operating Leases |  | Finance Leases
2026 | $ | 16 |  |  | $ | 62 |  |  | $ | 3 |
2027 | 16 |  |  | 54 |  |  | 2 |
2028 | 16 |  |  | 47 |  |  | — |
2029 | 15 |  |  | 36 |  |  | — |
2030 | 15 |  |  | 28 |  |  | — |
2031 and thereafter | 537 |  |  | 84 |  |  | 7 |
Gross lease payments | 615 |  |  | 311 |  |  | 12 |
Less: Imputed interest | 376 |  |  | 41 |  |  | 6 |
Total lease liabilities | $ | 239 |  |  | $ | 270 |  |  | $ | 6 |
Finance Lease, Liability, to be Paid, Maturity | As of December 31, 2025, maturities of lease liabilities for operating lease obligations and finance lease obligations having initial or remaining non-cancellable lease terms in excess of one year are as follows:
(In millions) | Related Party Operating Leases |  | Third Party Operating Leases |  | Finance Leases
2026 | $ | 16 |  |  | $ | 62 |  |  | $ | 3 |
2027 | 16 |  |  | 54 |  |  | 2 |
2028 | 16 |  |  | 47 |  |  | — |
2029 | 15 |  |  | 36 |  |  | — |
2030 | 15 |  |  | 28 |  |  | — |
2031 and thereafter | 537 |  |  | 84 |  |  | 7 |
Gross lease payments | 615 |  |  | 311 |  |  | 12 |
Less: Imputed interest | 376 |  |  | 41 |  |  | 6 |
Total lease liabilities | $ | 239 |  |  | $ | 270 |  |  | $ | 6 |
Operating Lease, Lease Income [Table Text Block] | Lease revenues included on the Consolidated Statements of Income during 2025, 2024 and 2023 were as follows:
| 2025 |  | 2024 |  | 2023
(In millions) | Related Party |  | Third Party |  | Related Party |  | Third Party |  | Related Party |  | Third Party
Operating leases: |  |  |  |  |  |  |  |  |  |  |
Rental income | $ | 889 |  |  | $ | 260 |  |  | $ | 853 |  |  | $ | 251 |  |  | $ | 822 |  |  | $ | 243 |
Sales-type leases: |  |  |  |  |  |  |  |  |  |  |
Interest income (Sales-type rental revenue - fixed minimum) | 431 |  |  | 113 |  |  | 455 |  |  | 114 |  |  | 467 |  |  | 114 |
Interest income (Revenue from variable lease payments) | 17 |  |  | 38 |  |  | 20 |  |  | 22 |  |  | 33 |  |  | 22 |
Sales-type lease revenue | $ | 448 |  |  | $ | 151 |  |  | $ | 475 |  |  | $ | 136 |  |  | $ | 500 |  |  | $ | 136 |
Sales-type Lease, Lease Income [Table Text Block] | Lease revenues included on the Consolidated Statements of Income during 2025, 2024 and 2023 were as follows:
| 2025 |  | 2024 |  | 2023
(In millions) | Related Party |  | Third Party |  | Related Party |  | Third Party |  | Related Party |  | Third Party
Operating leases: |  |  |  |  |  |  |  |  |  |  |
Rental income | $ | 889 |  |  | $ | 260 |  |  | $ | 853 |  |  | $ | 251 |  |  | $ | 822 |  |  | $ | 243 |
Sales-type leases: |  |  |  |  |  |  |  |  |  |  |
Interest income (Sales-type rental revenue - fixed minimum) | 431 |  |  | 113 |  |  | 455 |  |  | 114 |  |  | 467 |  |  | 114 |
Interest income (Revenue from variable lease payments) | 17 |  |  | 38 |  |  | 20 |  |  | 22 |  |  | 33 |  |  | 22 |
Sales-type lease revenue | $ | 448 |  |  | $ | 151 |  |  | $ | 475 |  |  | $ | 136 |  |  | $ | 500 |  |  | $ | 136 |
Lessor, Operating Lease, Payment to be Received, Fiscal Year Maturity [Table Text Block] | The following is a schedule of minimum future rental payments to be received on the non-cancellable operating leases as of December 31, 2025:
(In millions) | Related Party |  | Third Party |  | Total
2026 | $ | 835 |  |  | $ | 107 |  |  | $ | 942 |
2027 | 721 |  |  | 80 |  |  | 801 |
2028 | 418 |  |  | 73 |  |  | 491 |
2029 | 264 |  |  | 71 |  |  | 335 |
2030 | 254 |  |  | 58 |  |  | 312 |
2031 and thereafter | 519 |  |  | 182 |  |  | 701 |
Total minimum future rentals | $ | 3,011 |  |  | $ | 571 |  |  | $ | 3,582 |
Sales-type and Direct Financing Leases, Lease Receivable, Maturity [Table Text Block] | Annual minimum undiscounted lease payment receipts under our sales-type leases were as follows as of December 31, 2025:
(In millions) | Related Party |  | Third Party |  | Total |  |  |  |
2026 | $ | 472 |  |  | $ | 181 |  |  | $ | 653 |  |  |  |  |
2027 | 390 |  |  | 163 |  |  | 553 |  |  |  |  |
2028 | 109 |  |  | 154 |  |  | 263 |  |  |  |  |
2029 | 56 |  |  | 146 |  |  | 202 |  |  |  |  |
2030 | 56 |  |  | 138 |  |  | 194 |  |  |  |  |
2031 and thereafter | 63 |  |  | 903 |  |  | 966 |  |  |  |  |
Total minimum future rentals | 1,146 |  |  | 1,685 |  |  | 2,831 |  |  |  |  |
Less: Imputed interest | 456 |  |  | 691 |  |  | 1,147 |  |  |  |  |
Lease receivable(1) | $ | 690 |  |  | $ | 994 |  |  | $ | 1,684 |  |  |  |  |
Current lease receivables(2) | $ | 269 |  |  | $ | 108 |  |  | $ | 377 |  |  |  |  |
Long-term lease receivables(3) | 421 |  |  | 886 |  |  | 1,307 |  |  |  |  |
Unguaranteed residual assets(3) | 263 |  |  | 117 |  |  | 380 |  |  |  |  |
Total sales-type lease assets | $ | 953 |  |  | $ | 1,111 |  |  | $ | 2,064 |  |  |  |  |
(1) This amount does not include the unguaranteed residual assets. (2) The related-party balance is presented in Current assets - related parties and the third-party balance is presented in Receivables, net in the Consolidated Balance Sheets. (3) The related-party balance is presented in Noncurrent assets - related parties and the third-party balance is presented in Other noncurrent assets in the Consolidated Balance Sheets.
Schedule of Property Subject to or Available for Operating Lease [Table Text Block] | The following schedule summarizes MPLX’s investment in assets held under operating lease by major classes as of December 31, 2025 and 2024:
| December 31,
(In millions) | 2025 |  | 2024
Pipelines | $ | 681 |  |  | $ | 689 |
Refining logistics | 1,774 |  |  | 1,430 |
Terminals | 1,440 |  |  | 1,310 |
Marine | 126 |  |  | 126 |
Gathering and transportation | 111 |  |  | 86 |
Processing and fractionation | 1,017 |  |  | 1,039 |
Land, building and other | 161 |  |  | 171 |
Total property, plant and equipment | 5,310 |  |  | 4,851 |
Less: accumulated depreciation | 2,731 |  |  | 2,378 |
Property, plant and equipment, net | $ | 2,579 |  |  | $ | 2,473 |

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