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Master Limited Partnership (Tables) | 9 Months Ended
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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) | 2024 |  | 2023 |  | 2024 |  | 2023
Number of shares repurchased | 16 |  |  | 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) | 2024 |  | 2023 |  | 2024 |  | 2023
Increase (decrease) due to change in ownership | $ | (29) |  |  | $ | (38) |  |  | $ | 198 |  |  | $ | (37) |
Tax impact | 9 |  |  | 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) | 2024 |  | 2023 |  | 2024 |  | 2023
Number of common units repurchased | 2 |  |  | — |  |  | 6 |  |  | — |
Cash paid for common units repurchased | $ | 76 |  |  | $ | — |  |  | $ | 226 |  |  | $ | — |
Average cost per unit | $ | 42.89 |  |  | $ | — |  |  | $ | 41.32 |  |  | $ | — |

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