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Leases Lessee Disclosure (Tables)
 12 Months Ended
Dec. 31, 2021
Lessee, Lease, Description [Line Items]  
Lease, Cost [Table Text Block]
The components of lease cost were as follows:
202120202019
(In millions)Related PartyThird
Party		Related
Party		Third
Party		Related
Party		Third
Party
Components of lease costs:
Operating lease costs$15 $71 $14 $78 $14 $75 
Finance lease cost:
Amortization of ROU assets— 2 — 3 — 5 
Interest on lease liabilities — 1 — 1 — 1 
Total finance lease cost— 3 — 4 — 6 
Variable lease cost— 15 1 10 1 11 
Short-term lease cost— 31 — 52 — 80 
Total lease cost$15 $120 $15 $144 $15 $172 
Supplemental Balance Sheet Disclosures [Text Block]
Supplemental balance sheet data related to leases were as follows:
December 31, 2021December 31, 2020
(In millions, except % and years)Related PartyThird PartyRelated PartyThird Party
Operating leases
Assets
Right of use assets$229 $268 $231$309
Liabilities
Operating lease liabilities1 59 163
Long-term operating lease liabilities228 205 229244
Total operating lease liabilities$229 $264 $230$307
Weighted average remaining lease term45.2 years8.3 years46.2 years8.0 years
Weighted average discount rate5.8 %4.1 %5.8 %4.3 %
Finance leases
Assets
Property, plant and equipment, gross$11 $17
Less: Accumulated depreciation4 8
Property, plant and equipment, net7 9
Liabilities
Long-term debt due within one year2 2
Long-term debt7 9
Total finance lease liabilities$9 $11
Weighted average remaining lease term19.4 years16.9 years
Weighted average discount rate6.0 %6.0 %
Schedule of Future Minimum Lease Payments for Operating and Finance Leases [Table Text Block]
As of December 31, 2021, 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
2022$15 $68 $2 
202315 59 2 
202414 38 1 
202514 21 1 
202614 18 1 
2027 and thereafter575 109 8 
Gross lease payments647 313 15 
Less: Imputed interest418 49 6 
Total lease liabilities$229 $264 $9 
Operating Lease, Lease Income
Lease revenues included on the Consolidated Statements of Income during 2021, 2020 and 2019 were as follows:
202120202019
(In millions)Related PartyThird
Party		Related PartyThird
Party		Related PartyThird
Party
Operating leases:
Rental income$743 $376 $952 $398 $1,196 $388 
Sales-type leases:
Profit/(loss) recognized at the commencement date— — — — — — 
Interest income (Sales-type rental revenue- fixed minimum)431 — 151 — 6 — 
Interest income (Revenue from variable lease payments)4 — 1 — 1 — 
Sales-type lease revenue$435 $— $152 $— $7 $— 
Sales-type Lease, Lease Income [Table Text Block]
Lease revenues included on the Consolidated Statements of Income during 2021, 2020 and 2019 were as follows:
202120202019
(In millions)Related PartyThird
Party		Related PartyThird
Party		Related PartyThird
Party
Operating leases:
Rental income$743 $376 $952 $398 $1,196 $388 
Sales-type leases:
Profit/(loss) recognized at the commencement date— — — — — — 
Interest income (Sales-type rental revenue- fixed minimum)431 — 151 — 6 — 
Interest income (Revenue from variable lease payments)4 — 1 — 1 — 
Sales-type lease revenue$435 $— $152 $— $7 $— 
Lessor, Operating Lease, Payment to be Received, Fiscal Year Maturity [Table Text Block]
The following is a schedule of minimum future rental revenue on the non-cancellable operating leases as of December 31, 2021:
(In millions)Related PartyThird PartyTotal
2022$632 $213 $845 
2023563 207 770 
2024514 204 718 
2025511 171 682 
2026504 142 646 
2027 and thereafter308 1,299 1,607 
Total minimum future rentals$3,032 $2,236 $5,268 
Sales-type and Direct Financing Leases, Lease Receivable, Maturity [Table Text Block]
The following is a schedule of minimum future revenue on sales-type leases as of December 31, 2021:
(In millions)Related Party
2022$544 
2023544 
2024538 
2025525 
2026422 
2027 and thereafter595 
Total minimum future rentals 3,168 
Less: present value discount2,232 
Lease receivable$936 
Assets Held Under Operating Lease
The following schedule summarizes MPLX’s investment in assets held under operating lease by major classes as of December 31, 2021 and 2020:
December 31,
(In millions)20212020
Pipelines$953 $834 
Refining logistics1,146 1,680 
Terminals1,290 1,276 
Marine129 129 
Gathering and transportation991 990 
Processing and fractionation867 867 
Land, building and other176 171 
Total property, plant and equipment5,552 5,947 
Less: accumulated depreciation2,042 2,007 
Property, plant and equipment, net$3,510 $3,940