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Equity
 12 Months Ended
Dec. 31, 2025
Equity [Abstract]  
Equity Equity
Units Outstanding
MPLX had 1,015,702,040 common units outstanding as of December 31, 2025. Of that number, 647,415,452 were owned by MPC. The changes in the number of common units during the years ended December 31, 2023, 2024 and 2025 are summarized below:
(In units)Common Units
Balance at December 31, 20221,001,020,616 
Unit-based compensation awards196,428 
Conversion of Series A preferred units2,281,831 
Balance at December 31, 20231,003,498,875 
Unit-based compensation awards141,985 
Conversion of Series A preferred units(1)
21,078,998 
Units redeemed in unit repurchase program(7,577,568)
Balance at December 31, 20241,017,142,290 
Unit-based compensation awards147,670 
Conversion of Series A preferred units(1)
6,166,965 
Units redeemed in unit repurchase program(7,754,885)
Balance at December 31, 20251,015,702,040 
(1)    Certain Series A preferred unitholders have exercised their rights to convert their Series A preferred units into common units as discussed in Note 9.
Unit Repurchase Program
On August 5, 2025, we announced a board authorization for the repurchase of $1.0 billion of MPLX common units held by the public in addition to the $1.0 billion common unit repurchase authorization announced on August 2, 2022. These unit repurchase authorizations have no expiration date. We may utilize various methods to effect the repurchases, which could include open market repurchases, negotiated block transactions, accelerated unit repurchases, tender offers or open market solicitations for units, some of which may be effected through Rule 10b5-1 plans. The timing and amount of future repurchases, if any, will depend upon several factors, including market and business conditions, and such repurchases may be suspended, discontinued or restarted at any time.
Total unit repurchases were as follows for the years ended December 31, 2025, 2024 and 2023:
(In millions, except per unit data)202520242023
Number of common units repurchased8 8 — 
Cash paid for common units repurchased(1)
$400 $326 $— 
Average cost per unit(1)
$51.58 $43.04 $— 
(1)Cash paid for common units repurchased and average cost per unit includes commissions paid to brokers during the period.
As of December 31, 2025, we had $1,120 million remaining under the unit repurchase authorizations.
Redemption of the Series B Preferred Units
On February 15, 2023, MPLX exercised its right to redeem all 600,000 units of 6.875 percent Fixed-to-Floating Rate Cumulative Redeemable Perpetual Preferred Units (the “Series B preferred units”). MPLX paid unitholders the Series B preferred unit redemption price of $1,000 per unit. MPLX made a final cash distribution of $21 million to Series B preferred unitholders on February 15, 2023, in conjunction with the redemption.
The changes in the Series B preferred unit balance during 2023 are included in the Consolidated Statements of Equity within Series B preferred units.
Cash Distributions
Total distributions declared for the years ended December 31, 2025, 2024 and 2023 are summarized in the table below.
202520242023
Distributions per common unit$4.066 $3.613 $3.250 
The allocation of total quarterly cash distributions to common and preferred unitholders is as follows for the years ended December 31, 2025, 2024 and 2023. The Sixth Amended and Restated Agreement of Limited Partnership, dated as of February 1, 2021 (“Partnership Agreement”) sets forth the calculation to be used to determine the amount and priority of cash distributions that the common unitholders and preferred unitholders will receive. MPLX’s distributions are declared for the prior quarter subsequent to the quarter end; therefore, the following table represents total cash distributions applicable to the period for which the distributions relate as opposed to the quarter in which they were declared and paid.
(In millions)202520242023
Common and preferred unit distributions:
Common unitholders, includes common units of general partner$4,138 $3,678 $3,256 
Series A preferred unit distributions— 27 94 
Series B preferred unit distributions(1)
— — 5 
Total cash distributions declared$4,138 $3,705 $3,355 
(1)    2023 period includes the portion of the $21 million distribution paid to the Series B preferred unitholders on February 15, 2023 that was earned during the period prior to the redemption.
On January 29, 2026, MPLX declared a quarterly cash distribution, based on the results of the fourth quarter of 2025, totaling $1,092 million, or $1.0765 per common unit. This distribution was paid on February 17, 2026 to unitholders of record on February 9, 2026.