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Share-Based Compensation - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
May 31, 2018
Feb. 28, 2019
Sep. 30, 2019
Jun. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Stock Options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Fair value of stock options on the date of grant (in dollars per share)     $ 15.44   $ 20.52 $ 17.99 $ 14.65
LTIP              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock options granted (in shares)   843,000          
Fair value of stock options on the date of grant (in dollars per share)   $ 17.45          
LTIP | Performance Units              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Awards granted (in shares)   300,000          
Percentage of grants with performance vesting, operating ratio   50.00%          
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 Executive Officers              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Percentage of payout subject to downward adjustment (up to)   25.00%          
LTIP | Performance Units | Certain Executive Officers | Maximum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Payout percentage range for participants   225.00%          
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)   65,000          
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            
Shares issued under the plan during the period (in shares)       144,000   249,000  
Weighted average purchase price of shares issued (in dollars per share)     $ 52.66     $ 52.72