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Stock Plans and Share-Based Compensation - Narrative (Details) | Feb. 10, 2021 shares | May 31, 2018 USD ($) shares
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LTIP |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Stock options granted (in shares) | 610,000 |
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% |
Number of equivalent shares of CSX common stock per unit of award (in shares) | 1 |
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 Employees |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Awards granted (in shares) | 189,000 |
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] |  |
Awards granted (in shares) | 163,000 |
Number of equivalent shares of CSX common stock per unit of award (in shares) | 1 |
Award vesting period (in years) | 3 years |
ESPP | Employee Stock Purchase Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Common stock registered for ESPP (in shares) |  | 4,000,000
Minimum payroll deduction percentage |  | 1.00%
Maximum payroll deduction percentage |  | 10.00%
Maximum stock value available for purchase | $ |  | $ 25,000
Percentage of shares market price |  | 85.00%
Share offering period |  | 6 months

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