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Debt (Tables) | 3 Months Ended
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Mar. 31, 2026
Debt Disclosure [Abstract] |
Schedule of Debt | MPLX’s outstanding borrowings consist of the following:
(In millions) | March 31, 2026 |  | December 31, 2025 |  |
MPLX LP: |  |  |  |  |
Fixed rate senior notes | $ | 25,969 |  |  | $ | 25,969 |  |  |
Consolidated subsidiaries: |  |  |  |  |
ANDX | 31 |  |  | 31 |  |  |
Finance lease obligations | 6 |  |  | 6 |  |  |
Total | 26,006 |  |  | 26,006 |  |  |
Unamortized debt issuance costs | (185) |  |  | (174) |  |  |
Unamortized discount | (187) |  |  | (179) |  |  |
Amounts due within one year | (1,251) |  |  | (1,502) |  |  |
Total long-term debt due after one year | $ | 24,383 |  |  | $ | 24,151 |  |  |

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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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