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Equity (Tables)
 3 Months Ended
Mar. 31, 2025
Equity [Abstract]  
Schedule of Stockholders Equity
The changes in the number of common units during the three months ended March 31, 2025 are summarized below:
(In units)Common Units
Balance at December 31, 20241,017,142,290 
Unit-based compensation awards124,029 
Conversion of Series A preferred units6,166,965 
Units redeemed in unit repurchase program(1,905,304)
Balance at March 31, 20251,021,527,980 
Distributions Made to Limited Partner, by Distribution
The allocation of total quarterly cash distributions to common and preferred unitholders is as follows for the three months ended March 31, 2025 and March 31, 2024. Distributions, although earned, are not accrued until declared. MPLX’s distributions are declared subsequent to quarter end; therefore, the following table represents total cash distributions applicable to the period in which the distributions were earned.
Three Months Ended 
March 31,
(In millions)20252024
Common and preferred unit distributions:
Common unitholders, includes common units of general partner$976 $864 
Series A preferred unit distributions— 10 
Total cash distributions declared$976 $874 
Class of Treasury Stock
Total unit repurchases were as follows for the respective periods:
Three Months Ended 
March 31,
(In millions, except per unit data)20252024
Number of common units repurchased2 2 
Cash paid for common units repurchased(1)
$100 $75 
Average cost per unit(1)
$52.48 $40.04 
(1)    Cash paid for common units repurchased and average cost per unit includes commissions paid to brokers during the period.
As of March 31, 2025, we had $420 million remaining under the unit repurchase authorization.
Dividends Declared
Quarterly distributions for 2025 and 2024 are summarized below:
(Per common unit)20252024
March 31,$0.9565 $0.8500