XML 110 R92.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Debt - Outstanding Borrowings (Detail) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 | Feb. 08, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |  |
Commercial paper |  | $ 0 |  |
Total |  | 17,807 |  | $ 13,418
Unamortized debt issuance costs |  | (109) |  | (59)
Unamortized discount | [1] | (440) |  | (413)
Amounts due within one year |  | (26) |  | (624)
Total long-term debt due after one year |  | 17,232 |  | 12,322
MPLX LP |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Amounts due within one year |  | (1) |  | (1)
Total long-term debt due after one year |  | 11,861 |  | 6,945
Senior Notes | MPLX LP |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross |  |  | $ 5,500 |
Senior Notes | MarkWest | MPLX LP |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unamortized discount |  | (362) |  | (374)
Trade receivables securitization facility due July 2019 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross |  | 0 |  |
MPLX bank revolving credit facility due 2022 | Line of Credit | MPLX LP |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross |  | 0 |  |
MPLX senior notes, 3.375%, due March 2023 | Senior Notes | MPLX LP |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross |  |  | $ 500 |
Debt instrument, interest rate |  |  | 3.375% |
MPLX senior notes, 4.000%, due March 2028 | Senior Notes | MPLX LP |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross |  |  | $ 1,250 |
Debt instrument, interest rate |  |  | 4.00% |
MPLX senior notes, 4.500%, due April 2038 | Senior Notes | MPLX LP |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross |  |  | $ 1,750 |
Debt instrument, interest rate |  |  | 4.50% |
MPLX senior notes, 4.700%, due April 2048 | Senior Notes | MPLX LP |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross |  |  | $ 1,500 |
Debt instrument, interest rate |  |  | 4.70% |
MPLX senior notes, 4.900%, due April 2058 | Senior Notes | MPLX LP |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross |  |  | $ 500 |
Debt instrument, interest rate |  |  | 4.90% |
Marathon Petroleum Corporation |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Commercial paper |  | 0 |  | 0
Marathon Petroleum Corporation | Capital Lease Obligations |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Capital lease obligations |  | $ 350 |  | 356
Debt instrument maturity year, start |  | Jan. 01, 2018 |  |
Debt instrument maturity year, end |  | Mar. 31, 2033 |  |
Marathon Petroleum Corporation | 364-day bank revolving credit facility due July 2018 | Line of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross |  | $ 0 |  | 0
Line of credit facility, expiration date |  | Jul. 20, 2018 |  |
Marathon Petroleum Corporation | Trade receivables securitization facility due July 2019 | Secured Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross |  | $ 0 |  | 0
Line of credit facility, expiration date |  | Jul. 19, 2019 |  |
Marathon Petroleum Corporation | Bank revolving credit facility due 2022 | Line of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross |  | $ 0 |  | 0
Line of credit facility, expiration date |  | Jul. 21, 2022 |  |
Marathon Petroleum Corporation | Senior notes, 2.700% due December 2018 | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross |  | $ 0 |  | 600
Debt instrument, maturity date |  | Dec. 14, 2018 |  |
Debt instrument, interest rate |  | 2.70% |  |
Marathon Petroleum Corporation | Senior notes, 3.400% due December 2020 | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross |  | $ 650 |  | 650
Debt instrument, maturity date |  | Dec. 15, 2020 |  |
Debt instrument, interest rate |  | 3.40% |  |
Marathon Petroleum Corporation | Senior notes, 5.125% due March 2021 | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross |  | $ 1,000 |  | 1,000
Debt instrument, maturity date |  | Mar. 01, 2021 |  |
Debt instrument, interest rate |  | 5.125% |  |
Marathon Petroleum Corporation | Senior notes, 3.625%, due September 2024 | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross |  | $ 750 |  | 750
Debt instrument, maturity date |  | Sep. 15, 2024 |  |
Debt instrument, interest rate |  | 3.625% |  |
Marathon Petroleum Corporation | Senior notes, 6.500%, due March 2041 | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross |  | $ 1,250 |  | 1,250
Debt instrument, maturity date |  | Mar. 01, 2041 |  |
Debt instrument, interest rate |  | 6.50% |  |
Marathon Petroleum Corporation | Senior notes, 4.750%, due September 2044 | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross |  | $ 800 |  | 800
Debt instrument, maturity date |  | Sep. 15, 2044 |  |
Debt instrument, interest rate |  | 4.75% |  |
Marathon Petroleum Corporation | Senior notes, 5.850% due December 2045 | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross |  | $ 250 |  | 250
Debt instrument, maturity date |  | Dec. 15, 2045 |  |
Debt instrument, interest rate |  | 5.85% |  |
Marathon Petroleum Corporation | Senior notes, 5.000%, due September 2054 | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross |  | $ 400 |  | 400
Debt instrument, maturity date |  | Sep. 15, 2054 |  |
Debt instrument, interest rate |  | 5.00% |  |
MPLX LP | Senior Notes | MarkWest |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross |  | $ 63 |  | 63
MPLX LP | Capital Lease Obligations |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Capital lease obligations |  | $ 7 |  | 7
Debt instrument maturity year, start |  | Jan. 01, 2018 |  |
Debt instrument maturity year, end |  | Mar. 31, 2020 |  |
MPLX LP | MPLX 364-day term loan | Unsecured Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross |  | $ 0 |  | 0
Line of credit facility, expiration date |  | Dec. 31, 2018 |  |
MPLX LP | MPLX term loan facility due 2019 | Unsecured Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross |  | $ 0 |  | 0
Line of credit facility, expiration date |  | Nov. 20, 2019 |  |
MPLX LP | MPLX bank revolving credit facility due 2022 | Line of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross |  | $ 0 |  | 505
Line of credit facility, expiration date |  | Jul. 21, 2022 |  |
MPLX LP | MPLX senior notes, 5.500%, due February 2023 | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross |  | $ 710 |  | 710
Debt instrument, maturity date |  | Feb. 15, 2023 |  |
Debt instrument, interest rate |  | 5.50% |  |
MPLX LP | MPLX senior notes, 5.500%, due February 2023 | Senior Notes | MarkWest |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, maturity date |  | Feb. 15, 2023 |  |
Debt instrument, interest rate |  | 5.50% |  |
MPLX LP | MPLX senior notes, 3.375%, due March 2023 | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross |  | $ 500 |  | 0
Debt instrument, maturity date |  | Mar. 15, 2023 |  |
Debt instrument, interest rate |  | 3.375% |  |
MPLX LP | MPLX senior notes, 4.500%, due July 2023 | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross |  | $ 989 |  | 989
Debt instrument, maturity date |  | Jul. 15, 2023 |  |
Debt instrument, interest rate |  | 4.50% |  |
MPLX LP | MPLX senior notes, 4.500%, due July 2023 | Senior Notes | MarkWest |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, maturity date |  | Jul. 15, 2023 |  |
Debt instrument, interest rate |  | 4.50% |  |
MPLX LP | MPLX senior notes, 4.875%, due December 2024 | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross |  | $ 1,149 |  | 1,149
Debt instrument, maturity date |  | Dec. 01, 2024 |  |
Debt instrument, interest rate |  | 4.875% |  |
MPLX LP | MPLX senior notes, 4.875%, due December 2024 | Senior Notes | MarkWest |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, maturity date |  | Dec. 01, 2024 |  |
Debt instrument, interest rate |  | 4.875% |  |
MPLX LP | MPLX senior notes, 4.000%, due February 2025 | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross |  | $ 500 |  | 500
Debt instrument, maturity date |  | Feb. 15, 2025 |  |
Debt instrument, interest rate |  | 4.00% |  |
MPLX LP | MPLX senior notes, 4.875%, due June 2025 | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross |  | $ 1,189 |  | 1,189
Debt instrument, maturity date |  | Jun. 01, 2025 |  |
Debt instrument, interest rate |  | 4.875% |  |
MPLX LP | MPLX senior notes, 4.875%, due June 2025 | Senior Notes | MarkWest |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, maturity date |  | Jun. 01, 2025 |  |
Debt instrument, interest rate |  | 4.875% |  |
MPLX LP | MPLX senior notes, 4.125%, due March 2027 | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross |  | $ 1,250 |  | 1,250
Debt instrument, maturity date |  | Mar. 01, 2027 |  |
Debt instrument, interest rate |  | 4.125% |  |
MPLX LP | MPLX senior notes, 4.000%, due March 2028 | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross |  | $ 1,250 |  | 0
Debt instrument, maturity date |  | Mar. 15, 2028 |  |
Debt instrument, interest rate |  | 4.00% |  |
MPLX LP | MPLX senior notes, 4.500%, due April 2038 | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross |  | $ 1,750 |  | 0
Debt instrument, maturity date |  | Apr. 15, 2038 |  |
Debt instrument, interest rate |  | 4.50% |  |
MPLX LP | MPLX senior notes, 5.200%, due March 2047 | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross |  | $ 1,000 |  | 1,000
Debt instrument, maturity date |  | Mar. 01, 2047 |  |
Debt instrument, interest rate |  | 5.20% |  |
MPLX LP | MPLX senior notes, 4.700%, due April 2048 | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross |  | $ 1,500 |  | 0
Debt instrument, maturity date |  | Apr. 15, 2048 |  |
Debt instrument, interest rate |  | 4.70% |  |
MPLX LP | MPLX senior notes, 4.900%, due April 2058 | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross |  | $ 500 |  | $ 0
Debt instrument, maturity date |  | Apr. 15, 2058 |  |
Debt instrument, interest rate |  | 4.90% |  |
[1] | Includes $362 million and $374 million of unamortized discount as of March 31, 2018 and December 31, 2017, respectively, related to the difference between the fair value and the principal amount of assumed MarkWest debt.

X
- Definition Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
Name: | us-gaap_CapitalLeaseObligations
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)(a)(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(13)(2)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
Name: | us-gaap_CommercialPaper
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13,16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
Name: | us-gaap_DebtAndCapitalLeaseObligations
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
Name: | us-gaap_DebtInstrumentCarryingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentMaturityDate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Latest date the outstanding debt instruments are required to be repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentMaturityDateRangeEnd1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Earliest date the outstanding debt instruments are required to be repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentMaturityDateRangeStart1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, after accumulated amortization, of debt discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 + Details
Name: | us-gaap_DebtInstrumentUnamortizedDiscount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DeferredFinanceCostsNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Date the credit facility terminates, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityExpirationDate1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LongTermDebtAndCapitalLeaseObligations
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | dei_LegalEntityAxis=mpc_MPLXLPMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=mpc_MarkWestMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mpc_TradeReceivablesSecuritizationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mpc_MPLXRevolverMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mpc_SeniorNotesDueMarch2023Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mpc_SeniorNotesDueMarch2028Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mpc_SeniorNotesDueApril2038Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mpc_SeniorNotesDueApril2048Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mpc_SeniorNotesDueApril2058Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConsolidatedEntitiesAxis=us-gaap_ParentCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_CapitalLeaseObligationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mpc_MPC364DayRevolverMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_SecuredDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mpc_MPCFiveYearRevolverMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mpc_SeniorNotesDueDecember2018Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mpc_SeniorNotesDueDecember2020Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mpc_SeniorNotesDueMarch2021Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mpc_SeniorNotesDueSeptember2024Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mpc_SeniorNotesDueMarch2041Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mpc_SeniorNotesDueSeptember2044Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mpc_SeniorNotesDueDecember2045Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mpc_SeniorNotesDueSeptember2054Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConsolidatedEntitiesAxis=us-gaap_SubsidiariesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mpc_MPLX364DayTermLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_UnsecuredDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mpc_MPLXTermLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mpc_SeniorNotesDueFebruary2023Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mpc_SeniorNotesDueJuly2023Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mpc_SeniorNotesDueDecember2024Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mpc_SeniorNotesDueFebruary2025Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mpc_SeniorNotesDueJune2025Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mpc_SeniorNotesDueMarch2027Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mpc_SeniorNotesDueMarch2047Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |