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Debt (Tables) | 3 Months Ended
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Mar. 31, 2018
Debt Disclosure [Abstract] |
Summary of Outstanding Borrowings | The Partnership’s outstanding borrowings consisted of the following:
(In millions) | March 31, 2018 |  | December 31, 2017
MPLX LP: |  |  |
Bank revolving credit facility due 2022 | $ | — |  |  | $ | 505 |
5.500% senior notes due February 2023 | 710 |  |  | 710 |
3.375% senior notes due March 2023 | 500 |  |  | — |
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 |  |  | 1,250 |
4.000% senior notes due March 2028 | 1,250 |  |  | — |
4.500% senior notes due April 2038 | 1,750 |  |  | — |
5.200% senior notes due March 2047 | 1,000 |  |  | 1,000 |
4.700% senior notes due April 2048 | 1,500 |  |  | — |
4.900% senior notes due April 2058 | 500 |  |  | — |
Consolidated subsidiaries: |  |  |
MarkWest - 4.500% - 5.500% senior notes, due 2023-2025 | 63 |  |  | 63 |
MPL - capital lease obligations due 2020 | 7 |  |  | 7 |
Total | 12,357 |  |  | 7,362 |
Unamortized debt issuance costs | (79 | ) |  | (27 | )
Unamortized discount | (416 | ) |  | (389 | )
Amounts due within one year | (1 | ) |  | (1 | )
Total long-term debt due after one year | $ | 11,861 |  |  | $ | 6,945 |

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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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