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Debt (Tables) | 3 Months Ended
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Mar. 31, 2018
Debt Disclosure [Abstract] |
Outstanding Borrowings | Our outstanding borrowings at March 31, 2018 and December 31, 2017 consisted of the following:
(In millions) | March 31, 2018 |  | December 31, 2017
Marathon Petroleum Corporation: |  |  |
Commercial paper | $ | — |  |  | $ | — |
364-day bank revolving credit facility due July 2018 | — |  |  | — |
Trade receivables securitization facility due July 2019 | — |  |  | — |
Bank revolving credit facility due 2022 | — |  |  | — |
Senior notes, 2.700% due December 2018 | — |  |  | 600 |
Senior notes, 3.400% due December 2020 | 650 |  |  | 650 |
Senior notes, 5.125% due March 2021 | 1,000 |  |  | 1,000 |
Senior notes, 3.625%, due September 2024 | 750 |  |  | 750 |
Senior notes, 6.500%, due March 2041 | 1,250 |  |  | 1,250 |
Senior notes, 4.750%, due September 2044 | 800 |  |  | 800 |
Senior notes, 5.850% due December 2045 | 250 |  |  | 250 |
Senior notes, 5.000%, due September 2054 | 400 |  |  | 400 |
Capital lease obligations due 2018-2033 | 350 |  |  | 356 |
MPLX LP: |  |  |
MPLX 364-day term loan facility due 2018 | — |  |  | — |
MPLX term loan facility due 2019 | — |  |  | — |
MPLX bank revolving credit facility due 2022 | — |  |  | 505 |
MPLX senior notes, 5.500%, due February 2023 | 710 |  |  | 710 |
MPLX senior notes, 3.375%, due March 2023 | 500 |  |  | — |
MPLX senior notes, 4.500%, due July 2023 | 989 |  |  | 989 |
MPLX senior notes, 4.875%, due December 2024 | 1,149 |  |  | 1,149 |
MPLX senior notes, 4.000%, due February 2025 | 500 |  |  | 500 |
MPLX senior notes, 4.875%, due June 2025 | 1,189 |  |  | 1,189 |
MarkWest senior notes, 4.500% - 5.500%, due 2023 - 2025 | 63 |  |  | 63 |
MPLX senior notes, 4.125%, due March 2027 | 1,250 |  |  | 1,250 |
MPLX senior notes, 4.000%, due March 2028 | 1,250 |  |  | — |
MPLX senior notes, 4.500%, due April 2038 | 1,750 |  |  | — |
MPLX senior notes, 5.200%, due March 2047 | 1,000 |  |  | 1,000 |
MPLX senior notes, 4.700%, due April 2048 | 1,500 |  |  | — |
MPLX senior notes, 4.900%, due April 2058 | 500 |  |  | — |
MPLX capital lease obligations due 2020 | 7 |  |  | 7 |
Total | 17,807 |  |  | 13,418 |
Unamortized debt issuance costs | (109 | ) |  | (59 | )
Unamortized discount(a) | (440 | ) |  | (413 | )
Amounts due within one year | (26 | ) |  | (624 | )
Total long-term debt due after one year | $ | 17,232 |  |  | $ | 12,322 |
(a) | 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.

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