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Share-Based Compensation - Narrative (Details)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Feb. 06, 2018
shares
Mar. 06, 2017
employee
Feb. 28, 2018
$ / shares
shares
Dec. 31, 2017
shares
Jun. 30, 2018
$ / shares
Jun. 30, 2017
USD ($)
$ / shares
Jun. 30, 2018
$ / shares
shares
Jun. 30, 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       $ 14.64 $ 12.83
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   70            
Share-based compensation expense revaluation of awards | $           $ 19   $ 31
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         $ 17.62 $ 12.27    
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