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Stock Plans and Share-Based Compensation - Narrative (Details)
8 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2022
USD ($)
plan
shares
Dec. 31, 2021
USD ($)
Dec. 31, 2020
May 31, 2018
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Period prior to grant date   3 years      
Performance Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation cost   $ 23,000,000      
Look-back period   2 years 8 months 12 days 2 years 10 months 24 days 2 years 10 months 24 days  
Expected weighted average period of recognition for unrecognized compensation cost (in years)   2 years      
Restricted Stock Units and Awards          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation cost   $ 22,000,000      
Expected weighted average period of recognition for unrecognized compensation cost (in years)   2 years      
Restricted Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award performance period   3 years      
Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award performance period   5 years      
Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation cost     $ 15,000,000    
Look-back period   6 years 6 years 6 years  
Expected weighted average period of recognition for unrecognized compensation cost (in years)     2 years    
Non-management Directors          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Annual retainer to be paid to non-management directors, cash option   $ 122,500      
Annual retainer to be paid to non-management directors, common stock option   172,500      
Chairman          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Annual grant of common stock amount   $ 250,000      
LITP | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Payout range (as a percent)   0.00%      
LITP | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Payout range (as a percent)   200.00%      
LITP | Performance Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of equivalent shares of CSX common stock per unit of award (in shares) | shares   1      
Award performance period   3 years      
Number of long term incentive plans | plan   3      
LITP | Restricted Stock Units and Awards          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of equivalent shares of CSX common stock per unit of award (in shares) | shares   1      
LITP | Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of equivalent shares of CSX common stock per unit of award (in shares) | shares   1      
LITP | Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award term   10 years      
LITP | Stock Options | Vesting on anniversary of the grant date (graded period)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award performance period   3 years      
LITP | Certain Executive Officers | Performance Units | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percentage of payout subject to adjustment   25.00%      
LITP | Certain Executive Officers | Performance Units | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percentage of payout subject to adjustment   250.00%      
2021-2023 LTIP | Performance Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award performance period   3 years      
Percentage payout on operating ratio   50.00%      
2020-2022 LTIP | Performance Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award performance period   3 years      
Percentage payout on operating ratio   50.00%      
2019-2021 LTIP | Performance Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award performance period   3 years      
ESPP | Employee Stock Purchase Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of registered shares of common stock that my be issued pursuant to plan (in shares) | shares         12,000,000
Employee contribution percentage, minimum         1.00%
Employee contribution percentage, maximum         10.00%
Maximum value of stocks purchased by employee, after tax         $ 25,000
Percentage of share closing market price 85.00%        
Share offering period 6 months