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Stock Plans and Share-Based Compensation - Narrative (Details)
1 Months Ended 8 Months Ended 12 Months Ended
Dec. 31, 2017
shares
Mar. 31, 2017
$ / shares
shares
Dec. 31, 2018
Dec. 31, 2019
USD ($)
plan
$ / shares
shares
Dec. 31, 2018
$ / shares
Dec. 31, 2017
USD ($)
employee
$ / shares
May 31, 2018
USD ($)
shares
Chief Executive Officer              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock options granted (in shares) | shares   9,000,000          
Fair value of stock options granted (in dollars per share) | $ / shares   $ 12.88          
Options forfeited (in shares) | shares 9,000,000            
Non-management Directors              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Annual retainer to be paid to non-management directors, common stock option | $       $ 162,500      
Chairman              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Annual grant of common stock amount | $       250,000      
Performance Units              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Unrecognized compensation cost | $       $ 23,000,000      
Expected weighted average period of recognition for unrecognized compensation cost (in years)       2 years      
Expected life (in years)       2 years 9 months 18 days 2 years 10 months 24 days    
Restricted Stock Units and Awards              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Unrecognized compensation cost | $       $ 8,000,000      
Expected weighted average period of recognition for unrecognized compensation cost (in years)       2 years      
Restricted Stock Units              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award performance period       3 years      
Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award performance period       5 years      
Stock Options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Unrecognized compensation cost | $       $ 15,000,000      
Expected weighted average period of recognition for unrecognized compensation cost (in years)       2 years      
Expected life (in years)       6 years 1 month 6 days 6 years 6 months 6 years 3 months 18 days  
Stock options granted (in shares) | shares       1,187,000      
Fair value of stock options granted (in dollars per share) | $ / shares       $ 17.87 $ 14.65 $ 12.84  
Stock Options | Chief Executive Officer              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award term   10 years          
LITP | Minimum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Payout range (as a percent)       0.00%      
LITP | Maximum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Payout range (as a percent)       200.00%      
LITP | Performance Units              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Performance unit equivalent of CSX stock (in shares) | shares       1      
Number of plans | plan       3      
LITP | Restricted Stock Units and Awards              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Performance unit equivalent of CSX stock (in shares) | shares       1      
LITP | Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Performance unit equivalent of CSX stock (in shares) | shares       1      
LITP | Stock Options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award term       10 years      
LITP | Stock Options | Vesting on anniversary of the grant date (graded period)              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award performance period       3 years      
LITP | Stock Options | Vesting after the grant date (cliff period)              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award performance period       3 years 3 years 3 years  
2017-2019 LTIP | Performance Units              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award performance period       3 years      
Cumulative payout period       3 years      
Percentage payout on operating ratio       50.00%      
Percentage payout on average return on assets       50.00%      
2017-2019 LTIP | Performance Units | Certain Executive Officers              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Percentage of payout subject to adjustment       30.00%      
2018-2020 LTIP | Performance Units              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award performance period       3 years      
Percentage payout on operating ratio       50.00%      
Percentage payout on average return on assets       50.00%      
2018-2020 LTIP | Performance Units | Minimum | Certain Executive Officers              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Percentage of payout subject to adjustment       25.00%      
2018-2020 LTIP | Performance Units | Maximum | Certain Executive Officers              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Percentage of payout subject to adjustment       200.00%      
2019-2021 LTIP | Performance Units              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award performance period       3 years      
Percentage payout on operating ratio       50.00%      
Percentage payout on average return on assets       50.00%      
2019-2021 LTIP | Performance Units | Minimum | Certain Executive Officers              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Percentage of payout subject to adjustment       50.00%      
2019-2021 LTIP | Performance Units | Maximum | Certain Executive Officers              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Percentage of payout subject to adjustment       250.00%      
Equity Award Modifications              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of employees impacted | employee           75  
Share-based compensation expense revaluation of awards | $           $ 39,000,000  
Non-management Directors              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Annual retainer to be paid to non-management directors, cash option | $       $ 112,500      
ESPP | Employee Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of registered shares of common stock that my be issued pursuant to plan (in shares) | shares             4,000,000
Employee contribution percentage, minimum             1.00%
Employee contribution percentage, maximum             10.00%
Maximum value of stocks purchased by employee, after tax | $             $ 25,000
Percentage of share closing market price     85.00%        
Share offering period     6 months        
Number of shares issued under the plan (in shares) | shares       250,000