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Master Limited Partnership (Tables)
 9 Months Ended
Sep. 30, 2024
Noncontrolling Interest [Line Items]  
Unit Repurchases
Total share repurchases were as follows for the respective periods:
Three Months Ended 
September 30,		Nine Months Ended 
September 30,
(In millions, except per share data)2024202320242023
Number of shares repurchased16 20 44 71 
Cash paid for shares repurchased$2,701 $2,819 $7,815 $9,067 
Average cost per share(a)
$170.99 $139.84 $175.20 $127.09 
(a)    The average cost per share includes excise tax on share repurchases resulting from the Inflation Reduction Act of 2022, but the excise tax does not reduce the remaining share repurchase authorization.
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net
As a result of equity transactions of MPLX, we are required to adjust non-controlling interest and additional paid-in capital. Changes in MPC’s additional paid-in capital resulting from changes in its ownership interests in MPLX were as follows:
Three Months Ended 
September 30,		Nine Months Ended 
September 30,
(Millions of dollars)2024202320242023
Increase (decrease) due to change in ownership$(29)$(38)$198 $(37)
Tax impact9 9 (67)11 
Increase (decrease) in MPC's additional paid-in capital, net of tax$(20)$(29)$131 $(26)
MPLX LP  
Noncontrolling Interest [Line Items]  
Unit Repurchases
Total unit repurchases were as follows for the respective periods:
Three Months Ended 
September 30,		Nine Months Ended 
September 30,
(In millions, except per unit data)2024202320242023
Number of common units repurchased2 — 6 — 
Cash paid for common units repurchased$76 $— $226 $— 
Average cost per unit$42.89 $— $41.32 $—