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Debt (Tables) | 3 Months Ended
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Mar. 31, 2017
Debt Disclosure [Abstract] |
Outstanding Borrowings | Our outstanding borrowings at March 31, 2017 and December 31, 2016 consisted of the following:
(In millions) | March 31, 2017 |  | December 31, 2016
Marathon Petroleum Corporation: |  |  |
Commercial paper | $ | — |  |  | $ | — |
364-day bank revolving credit facility due July 2017 | — |  |  | — |
Trade receivables securitization facility due July 2019 | — |  |  | — |
Bank revolving credit facility due 2020 | — |  |  | — |
Term loan agreement due 2019 | — |  |  | 200 |
Senior notes, 2.700% due December 2018 | 600 |  |  | 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 |
MPLX LP: |  |  |
MPLX term loan facility due 2019 | 250 |  |  | 250 |
MPLX bank revolving credit facility due 2020 | — |  |  | — |
MPLX senior notes, 5.500%, due February 2023 | 710 |  |  | 710 |
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 |  |  | — |
MPLX senior notes, 5.200%, due March 2047 | 1,000 |  |  | — |
Capital lease obligations due 2017-2028 | 312 |  |  | 319 |
Total | 13,112 |  |  | 11,069 |
Unamortized debt issuance costs | (64 | ) |  | (44 | )
Unamortized discount(a) | (450 | ) |  | (453 | )
Amounts due within one year | (28 | ) |  | (28 | )
Total long-term debt due after one year | $ | 12,570 |  |  | $ | 10,544 |
(a) | Includes $409 million and $420 million of unamortized discount as of March 31, 2017 and December 31, 2016, respectively, related to the difference between the fair value and the principal amount of assumed MarkWest debt.

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