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Equity (Tables)
 12 Months Ended
Dec. 31, 2025
Equity [Abstract]  
Schedule of Stockholders Equity [Table Text Block] 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.
Class of Treasury Stock [Table Text Block]
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.
Dividends Declared
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 
Distributions Made to Limited Partner, by Distribution [Table Text Block]
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.