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Stock Plans and Share-Based Compensation - Fair Value Assumptions for Stock Options (Details) - Stock Options - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted-average grant-date fair value (in dollars per share) $ 17.77 $ 20.51 $ 18.87 $ 18.00
Stock options valuation assumptions:        
Annual dividend yield 1.50% 1.20% 1.20% 1.30%
Risk-free interest rate 0.50% 2.40% 1.40% 2.50%
Annualized volatility 30.10% 25.40% 26.00% 25.70%
Expected life (in years) 6 years 6 months 6 years 6 months 6 years 6 years 1 month 6 days
Other pricing model inputs:        
Weighted-average grant-date market price of CSX stock (strike price) (in dollars per share) $ 70.87 $ 78.58 $ 79.48 $ 69.97