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Stock Plans and Share-Based Compensation - Narrative (Details) |  | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
May 31, 2018 USD ($) shares | Feb. 28, 2022 shares | Jun. 30, 2022 shares | Jun. 30, 2021 shares | Jun. 30, 2022 shares | Jun. 30, 2021 shares
LTIP |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock options granted (split-adjusted) (in shares) |  | 1,600,000 |  |  |  |
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 (split-adjusted) (in shares) |  | 494,000 |  |  |  |
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 (split-adjusted) (in shares) |  | 452,000 |  |  |  |
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) | 12,000,000 |  |  |  |  |
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 |  |  |  |  |
Shares issued (in shares) |  |  | 0 | 0 | 326,000 | 396,000

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