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Share-Based Compensation - Narrative (Details)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Mar. 06, 2017
employee
shares
Mar. 31, 2017
$ / shares
shares
Feb. 28, 2017
$ / shares
shares
Sep. 30, 2017
shares
Sep. 23, 2016
shares
Sep. 30, 2017
USD ($)
$ / shares
shares
Sep. 23, 2016
$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock options granted (in shares)     1,300,000 0 0    
Fair value of stock options (in dollars per share) | $ / shares     $ 12.54     $ 12.83 $ 4.68
Chief Executive Officer              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock options granted (in shares)   9,000,000          
Fair value of stock options (in dollars per share) | $ / shares   $ 12.88          
Chief Executive Officer | Vesting Upon Service Anniversary              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of vesting options (in shares)   4,500,000          
Award vesting period (in years)   4 years          
Chief Executive Officer | Vesting Upon Achievement of Performance Targets              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of vesting options (in shares) 4,500,000            
Award vesting period (in years) 4 years            
2017 - 2019 LTIP              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Percentage of payout subject to downward adjustment (up to)           30.00%  
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 | $           $ 31  
Performance Units | 2017 - 2019 LTIP              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Awards granted (in shares)     600,000        
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)     300,000        
Employee Stock Option              
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        
Employee Stock Option | Chief Executive Officer              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Term of stock options (in years)   10 years