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Stock Plans and Share-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2025
Share-Based Payment Arrangement [Abstract] |
Schedule of Pre-tax Expense and Income Tax Benefits Associated with Share-Based Compensation | Total pre-tax expense and income tax benefits associated with share-based compensation are shown in the table below. Income tax benefits include impacts from option exercises and the vesting of other equity awards.
| First Quarters |  |
(Dollars in Millions) | 2025 | 2024 |  |  |
Share-Based Compensation Expense: |  |  |  |  |
Restricted Stock Units | $ | 6 |  | $ | 7 |  |  |  |
Stock Options | 3 |  | 3 |  |  |  |
Stock Awards for Directors | 3 |  | 2 |  |  |  |
Employee Stock Purchase Plan | 2 |  | 2 |  |  |  |
Performance Units | — |  | 2 |  |  |  |
Total Share-Based Compensation Expense | $ | 14 |  | $ | 16 |  |  |  |
Income Tax Benefit | $ | 3 |  | $ | 5 |  |  |  |
Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award | In February 2025, the Company granted the following awards under a new long-term incentive plan ("LTIP") for the years 2025 through 2027, which was adopted under the CSX 2019 Stock and Incentive Award Plan.
| Granted (Thousands) | Weighted Avg. Fair Value
Performance Units | 668 | $ | 33.74 |
Restricted Stock Units | 666 | 33.37 |
Stock Options | 1,100 | 10.16 |

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