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Stock Plans and Share-Based Compensation - Narrative (Details) | 3 Months Ended
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Mar. 31, 2024 shares
Performance Units |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Award vesting period (in years) | 3 years
LTIP | Performance Units |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Percentage of grants with performance vesting, average annual operating income growth | 0.50
Percentage of grants with performance vesting, cumulative free cash flow | 50.00%
LTIP | Performance Units | Minimum |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Payout percentage range for participants | 0.00%
LTIP | Performance Units | Maximum |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Payout percentage range for participants | 200.00%
LTIP | Performance Units | Certain Executive Officers |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Percentage of payout subject to upward or downward adjustment (up to) | 0.25
LTIP | Performance Units | Certain Executive Officers | Maximum |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Payout percentage range for participants | 250.00%
LTIP | Stock Options |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Term of stock options (in years) | 10 years
Award vesting period (in years) | 3 years
LTIP | Restricted Stock Units |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Award vesting period (in years) | 3 years
Number of equivalent shares of CSX common stock per unit of award (in shares) | 1

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