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Debt (Tables)

3 Months Ended

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.

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