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Master Limited Partnership (Tables)
 12 Months Ended
Dec. 31, 2023
Noncontrolling Interest [Line Items]  
Unit Repurchases
Total share repurchases were as follows for the respective periods:
(In millions, except per share data)202320222021
Number of shares repurchased89 131 76 
Cash paid for shares repurchased$11,572 $11,922 $4,654 
Average cost per share(a)
$131.27 $91.20 $62.65 
(a)    The average cost per share for the 2023 period includes excise tax on share repurchases resulting from the Inflation Reduction Act of 2022, but does not reduce the share repurchase authorization.
Noncontrolling Interest
As a result of equity transactions of MPLX, we are required to adjust non-controlling interest and additional paid-in capital. Changes in MPC’s additional paid-in capital resulting from changes in its ownership interest in MPLX were as follows:
(Millions of dollars)202320222021
Decrease due to change in ownership$(4)$(164)$(166)
Tax impact— 44 73 
Decrease in MPC's additional paid-in capital, net of tax$(4)$(120)$(93)
MPLX  
Noncontrolling Interest [Line Items]  
Unit Repurchases
Total unit repurchases were as follows for the respective periods:
(In millions, except per unit data)202320222021
Number of common units repurchased— 15 23 
Cash paid for common units repurchased$— $491 $630 
Average cost per unit$— $31.96 $27.52