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Debt (Tables) | 9 Months Ended
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Sep. 30, 2019
Debt Disclosure [Abstract] |
Outstanding Borrowings | Our outstanding borrowings at September 30, 2019 and December 31, 2018 consisted of the following:
(In millions) | September 30, 2019 |  | December 31, 2018
Marathon Petroleum Corporation | $ | 9,174 |  |  | $ | 9,114 |
MPLX LP | 20,120 |  |  | 13,856 |
ANDX(a) | — |  |  | 5,010 |
Total debt | $ | 29,294 |  |  | $ | 27,980 |
Unamortized debt issuance costs | (137 | ) |  | (128 | )
Unamortized discount | (318 | ) |  | (328 | )
Amounts due within one year | (557 | ) |  | (544 | )
Total long-term debt due after one year | $ | 28,282 |  |  | $ | 26,980 |
Schedule of Line of Credit Facilities [Table Text Block] | Available Capacity under our Facilities
(Dollars in millions) |  | Total Capacity |  | Outstanding Borrowings |  | Outstanding Letters of Credit |  | Available Capacity |  | Weighted Average Interest Rate |  | Expiration
MPC 364-day bank revolving credit facility |  | $ | 1,000 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,000 |  |  | — |  |  | September 2020
MPC bank revolving credit facility |  | 5,000 |  |  | — |  |  | 1 |  |  | 4,999 |  |  | — |  |  | October 2023
MPC trade receivables securitization facility |  | 750 |  |  | — |  |  | — |  |  | 750 |  |  | — |  |  | July 2021
MPLX bank revolving credit facility |  | 3,500 |  |  | — |  |  | 3 |  |  | 3,497 |  |  | — |  |  | July 2024
MPLX term loan facility |  | 1,000 |  |  | 500 |  |  | — |  |  | 500 |  |  | 2.795 | % |  | September 2021

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- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21521-112644 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21538-112644 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
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