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Stock Plans and Share-Based Compensation - Narrative (Details)
1 Months Ended 12 Months Ended
May 31, 2018
USD ($)
shares
Dec. 31, 2025
USD ($)
plan
shares
Dec. 31, 2024
plan
Dec. 31, 2023
plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Period prior to grant date   3 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   $ 130,000    
Annual retainer to be paid to non-management directors, common stock option   190,000    
Chairman        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Annual grant of common stock amount   250,000    
Performance Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost   $ 10,000,000    
Expected weighted average period of recognition for unrecognized compensation cost (in years)   2 years    
Expected life (in years)   2 years 8 months 12 days 2 years 10 months 24 days 2 years 9 months 18 days
Performance Units | Long-term Incentive Plans        
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    
Number of long term incentive plans | plan   3 3 3
Percentage payout on operating ratio   50.00%    
Performance Units | Long-term Incentive Plans | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation arrangement by share-based payment award, equity instruments other than options, payout percentage of target   0.00%    
Performance Units | Long-term Incentive Plans | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation arrangement by share-based payment award, equity instruments other than options, payout percentage of target   200.00%    
Performance Units | 2025-2027 LTIP        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award performance period   3 years 3 years 3 years
Performance Units | 2025-2027 LTIP | Certain Executive Officers        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share based compensation arrangement by share based payment award, equity instruments other than options, payout percentage adjustment   0.20    
Performance Units | 2025-2027 LTIP | Maximum | Certain Executive Officers        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation arrangement by share-based payment award, equity instruments other than options, payout percentage of target   240.00%    
Performance Units | 2024-2026 LTIP        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award performance period   3 years 3 years 3 years
Performance Units | 2024-2026 LTIP | Certain Executive Officers        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share based compensation arrangement by share based payment award, equity instruments other than options, payout percentage adjustment   0.25    
Performance Units | 2024-2026 LTIP | Maximum | Certain Executive Officers        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation arrangement by share-based payment award, equity instruments other than options, payout percentage of target   250.00%    
Performance Units | 2023-2025 LTIP        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award performance period   3 years 3 years 3 years
Performance Units | 2023-2025 LTIP | Certain Executive Officers        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share based compensation arrangement by share based payment award, equity instruments other than options, payout percentage adjustment   0.25    
Performance Units | 2023-2025 LTIP | Maximum | Certain Executive Officers        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation arrangement by share-based payment award, equity instruments other than options, payout percentage of target   250.00%    
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost   $ 12,000,000    
Expected weighted average period of recognition for unrecognized compensation cost (in years)   2 years    
Expected life (in years)   6 years 6 years 6 years
Stock Options | Long-term Incentive Plans        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award term   10 years    
Stock Options | Long-term Incentive Plans | 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    
Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost   $ 21,000,000    
Expected weighted average period of recognition for unrecognized compensation cost (in years)   2 years    
Restricted Stock Units | Share-Based Payment Arrangement, Graduated Vesting        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award performance period   3 years    
Restricted Stock Units | Long-term Incentive Plans        
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    
Employee Stock Purchase Plans | 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