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v3.25.1

Debt (Tables) | 3 Months Ended
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Mar. 31, 2025
Debt Disclosure [Abstract] |
Schedule of Debt | MPLX’s outstanding borrowings consist of the following:
(In millions) | March 31, 2025 |  | December 31, 2024
MPLX LP: |  |  |
MPLX Credit Agreement | $ | — |  |  | $ | — |
Fixed rate senior notes | 22,658 |  |  | 21,158 |
Consolidated subsidiaries: |  |  |
MarkWest | 11 |  |  | 11 |
ANDX | 31 |  |  | 31 |
Finance lease obligations | 8 |  |  | 6 |
Total | 22,708 |  |  | 21,206 |
Unamortized debt issuance costs | (143) |  |  | (126) |
Unamortized discount | (147) |  |  | (132) |
Amounts due within one year | (2,697) |  |  | (1,693) |
Total long-term debt due after one year | $ | 19,721 |  |  | $ | 19,255 |

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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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