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Share-Based Compensation - Narrative (Details)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended
Feb. 06, 2018
$ / shares
shares
Mar. 06, 2017
employee
Dec. 31, 2017
shares
Mar. 31, 2018
$ / shares
shares
Mar. 31, 2017
USD ($)
$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock options granted (in shares) 950,000        
Fair value of stock options (in dollars per share) | $ / shares $ 14.55        
2017 - 2019 LTIP          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percentage of payout subject to downward adjustment (up to)       25.00%  
2017 - 2019 LTIP | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Payout range for participants (as a percent)       0.00%  
2017 - 2019 LTIP | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Payout range for participants (as a percent)       200.00%  
Equity Award Modifications          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of employees impacted (employees) | employee   58      
Share-based compensation expense revaluation of awards | $         $ 12
Performance Units | 2017 - 2019 LTIP          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Awards granted (in shares) 350,000        
Percentage of grants with performance vesting, operating ratio (as a percent)       50.00%  
Percentage of grants with performance vesting, return on assets (as a percent)       50.00%  
Performance unit equivalent of CSX common stock (in shares)       1  
Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period (in years) 3 years        
Restricted Stock Units (RSUs) | 2017 - 2019 LTIP          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Awards granted (in shares) 85,000        
Employee Stock Option          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Fair value of stock options (in dollars per share) | $ / shares       $ 14.62 $ 12.83
Term of stock options (in years) 10 years        
Award vesting period (in years) 3 years        
Chief Executive Officer          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options forfeited (in shares)     9,000,000