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Share-Based Compensation - Narrative (Details) - $ / shares
1 Months Ended 3 Months Ended
Feb. 10, 2016
Feb. 29, 2016
Mar. 25, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock options granted     2,400,000
Fair value of stock options     $ 4.68
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period     3 years
Employee Stock Option      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period     3 years
Term of stock options     P10Y
2015 - 2017 LTIP      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of payout subject to downward adjustment (up to)     30.00%
2015 - 2017 LTIP | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Payout range for participants     0.00%
2015 - 2017 LTIP | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Payout range for participants     200.00%
2015 - 2017 LTIP | Performance Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awards granted 839,000    
Percentage of grants with performance vesting, operating ratio 50.00%    
Percentage of grants with performance vesting, return on assets 50.00%    
Performance unit equivalent of CSX common stock, in shares 1    
2015 - 2017 LTIP | Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awards granted   419,000  
Award vesting period 3 years