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Debt (Tables) | 6 Months Ended
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Jun. 30, 2017
Debt Disclosure [Abstract] |
Summary of Outstanding Borrowings | The Partnership’s outstanding borrowings consisted of the following:
(In millions) | June 30, 2017 |  | December 31, 2016
MPLX LP: |  |  |
Bank revolving credit facility due 2020 | $ | — |  |  | $ | — |
Term loan facility due 2019 | 250 |  |  | 250 |
5.500% senior notes due February 2023 | 710 |  |  | 710 |
4.500% senior notes due July 2023 | 989 |  |  | 989 |
4.875% senior notes due December 2024 | 1,149 |  |  | 1,149 |
4.000% senior notes due February 2025 | 500 |  |  | 500 |
4.875% senior notes due June 2025 | 1,189 |  |  | 1,189 |
4.125% senior notes due March 2027 | 1,250 |  |  | — |
5.200% senior notes due March 2047 | 1,000 |  |  | — |
Consolidated subsidiaries: |  |  |
MarkWest - 4.500% - 5.500% senior notes, due 2023-2025 | 63 |  |  | 63 |
MPL - capital lease obligations due 2020 | 8 |  |  | 8 |
Total | 7,108 |  |  | 4,858 |
Unamortized debt issuance costs | (28 | ) |  | (7 | )
Unamortized discount | (413 | ) |  | (428 | )
Amounts due within one year | (1 | ) |  | (1 | )
Total long-term debt due after one year | $ | 6,666 |  |  | $ | 4,422 |

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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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