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Master Limited Partnership (Tables)
 12 Months Ended
Dec. 31, 2024
Noncontrolling Interest [Line Items]  
Unit Repurchases
Total share repurchases were as follows for the respective periods:
(In millions, except per share data)202420232022
Number of shares repurchased53 89 131 
Cash paid for shares repurchased(a)
$9,077 $11,572 $11,922 
Average cost per share(b)
$171.68 $131.27 $91.20 
(a)    2024 excludes $112 million paid for excise tax on 2023 share purchases.
(b)    The average cost per share includes excise tax on share repurchases resulting from the Inflation Reduction Act of 2022, but the excise tax does not reduce the remaining share repurchase authorization.
Noncontrolling Interest
As a result of equity transactions of MPLX, we are required to adjust non-controlling interest and additional paid-in capital. Changes in MPC’s additional paid-in capital resulting from changes in its ownership interest in MPLX were as follows:
(Millions of dollars)202420232022
Increase (decrease) due to change in ownership$159 $(4)$(164)
Tax impact(55)— 44 
Increase (decrease) in MPC's additional paid-in capital, net of tax$104 $(4)$(120)
MPLX  
Noncontrolling Interest [Line Items]  
Unit Repurchases
Total unit repurchases were as follows for the respective periods:
(In millions, except per unit data)202420232022
Number of common units repurchased8 — 15 
Cash paid for common units repurchased$326 $— $491 
Average cost per unit$43.04 $— $31.96