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Leases Disclosure (Tables)
 12 Months Ended
Dec. 31, 2023
Leases [Abstract]  
Lease, Cost [Table Text Block]
The components of lease cost were as follows:

202320222021
(In millions)Related PartyThird
Party		Related
Party		Third
Party		Related
Party		Third
Party
Components of lease costs:
Operating lease costs$14 $56 $15 $61 $15 $71 
Finance lease cost:
Amortization of ROU assets— 1 — 1 — 2 
Interest on lease liabilities — — — 1 — 1 
Total finance lease cost— 1 — 2 — 3 
Variable lease cost4 10 2 16 — 15 
Short-term lease cost1 61 — 45 — 31 
Total lease cost$19 $128 $17 $124 $15 $120 
Supplemental Balance Sheet Disclosures [Text Block]
Supplemental balance sheet data related to leases were as follows:

December 31, 2023December 31, 2022
(In millions, except % and years)Related PartyThird PartyRelated PartyThird Party
Operating leases
Assets
Right of use assets$227 $264 $228$283
Liabilities
Operating lease liabilities1 45 146
Long-term operating lease liabilities226 211 228230
Total operating lease liabilities$227 $256 $229$276
Weighted average remaining lease term43 years9 years44 years9 years
Weighted average discount rate5.8 %4.2 %5.8 %4.1 %
Finance leases
Assets
Property, plant and equipment, gross$10 $11
Less: Accumulated depreciation5 4
Property, plant and equipment, net5 7
Liabilities
Long-term debt due within one year1 1
Long-term debt5 7
Total finance lease liabilities$6 $8
Weighted average remaining lease term20 years18 years
Weighted average discount rate6.0 %6.0 %
Lessee, Operating Lease, Liability, to be Paid, Maturity
As of December 31, 2023, 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
2024$15 $55 $1 
202514 40 1 
202614 35 1 
202714 31 1 
202814 29 1 
2029 and thereafter547 115 6 
Gross lease payments618 305 11 
Less: Imputed interest391 49 5 
Total lease liabilities$227 $256 $6 
Finance Lease, Liability, to be Paid, Maturity
As of December 31, 2023, 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
2024$15 $55 $1 
202514 40 1 
202614 35 1 
202714 31 1 
202814 29 1 
2029 and thereafter547 115 6 
Gross lease payments618 305 11 
Less: Imputed interest391 49 5 
Total lease liabilities$227 $256 $6 
Operating Lease, Lease Income [Table Text Block]
Lease revenues included on the Consolidated Statements of Income during 2023, 2022 and 2021 were as follows:
202320222021
(In millions)Related PartyThird
Party		Related PartyThird
Party		Related PartyThird
Party
Operating leases:
Rental income$822 $243 $763 $327 $743 $376 
Sales-type leases:
Interest income (Sales-type rental revenue - fixed minimum)467 114 447 46 431 — 
Interest income (Revenue from variable lease payments)33 22 18 16 4 — 
Sales-type lease revenue$500 $136 $465 $62 $435 $— 
Sales-type Lease, Lease Income [Table Text Block]
Lease revenues included on the Consolidated Statements of Income during 2023, 2022 and 2021 were as follows:
202320222021
(In millions)Related PartyThird
Party		Related PartyThird
Party		Related PartyThird
Party
Operating leases:
Rental income$822 $243 $763 $327 $743 $376 
Sales-type leases:
Interest income (Sales-type rental revenue - fixed minimum)467 114 447 46 431 — 
Interest income (Revenue from variable lease payments)33 22 18 16 4 — 
Sales-type lease revenue$500 $136 $465 $62 $435 $— 
Lessor, Operating Lease, Payment to be Received, Fiscal Year Maturity [Table Text Block]
The following is a schedule of minimum future rental payments on the non-cancellable operating leases as of December 31, 2023:
(In millions)Related PartyThird PartyTotal
2024$759 $117 $876 
2025737 95 832 
2026590 75 665 
2027447 53 500 
2028168 46 214 
2029 and thereafter47 250 297 
Total minimum future rentals$2,748 $636 $3,384 
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, 2023:
(In millions)Related PartyThird PartyTotal
2024$503 $175 $678 
2025504 161 665 
2026472 150 622 
2027359 141 500 
202886 132 218 
2029 and thereafter128 959 1,087 
Total minimum future rentals 2,052 1,718 3,770 
Less: Imputed interest1,114 778 1,892 
Lease receivable(1)
$938 940 1,878 
Current lease receivables(2)
149 102 251 
Long-term lease receivables(3)
789 838 1,627 
Unguaranteed residual assets(3)
126 78 204 
Total sales-type lease assets$1,064 $1,018 $2,082 
(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, 2023 and 2022:
December 31,
(In millions)20232022
Pipelines$677 $670 
Refining logistics1,399 1,310 
Terminals1,267 1,241 
Marine126 126 
Gathering and transportation86 94 
Processing and fractionation1,000 973 
Land, building and other165 163 
Total property, plant and equipment4,720 4,577 
Less: accumulated depreciation2,124 1,880 
Property, plant and equipment, net$2,596 $2,697