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Stock Plans and Share-Based Compensation - Narrative (Details)
1 Months Ended 3 Months Ended
May 31, 2018
USD ($)
shares
Feb. 28, 2021
shares
Jun. 30, 2020
shares
LTIP      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock options granted (split-adjusted) (in shares)   1,831,000  
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)   566,000  
LTIP | Performance Units | Certain Executive Officers      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awards granted (split-adjusted) (in shares)     0
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)   490,000  
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