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Stock Plans and Share-Based Compensation - Narrative (Details)
12 Months Ended
Dec. 30, 2016
USD ($)
plan
shares
Dec. 25, 2015
Dec. 26, 2014
shares
Restricted Stock Units and Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 3 years    
Performance Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost $ 18,000,000    
Expected weighted average period of recognition for unrecognized compensation cost (in years) 2 years    
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 5 years    
Unrecognized compensation cost $ 13,000,000    
Expected weighted average period of recognition for unrecognized compensation cost (in years) 2 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    
Stock options granted | shares 2,383,000    
Expected life (in years) 6 years 6 months 6 years 6 months  
Long-term Incentive Plans | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Payout range 0.00%    
Long-term Incentive Plans | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Payout range 200.00%    
Long-term Incentive Plans | 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    
Payout percentage cumulative period 3 years    
Percentage payout on operating ratio 50.00%    
Percentage payout on average return on assets 50.00%    
Percentage of payout subject to reduction (up to) 30.00%    
Long-term Incentive Plans | Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock options granted | shares     0
Award term 10 years    
Option requisite service period 3 years    
Long Term Incentive Plan 2014-2016      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 3 years    
Long Term Incentive Plans 2015-2017      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 3 years    
Long Term Incentive Plan 2016-2018      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 3 years    
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 $ 90,000    
Annual retainer to be paid to non-management directors, common stock option $ 150,000    
Long Term Incentive Plan Year One | Performance Units | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Payout range 0.00%    
Long Term Incentive Plan Year One | Performance Units | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Payout range 200.00%    
Long Term Incentive Plan Year Two | Performance Units | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Payout range 0.00%    
Long Term Incentive Plan Year Two | Performance Units | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Payout range 200.00%    
Long Term Incentive Plan Year Three | Performance Units | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Payout range 0.00%    
Long Term Incentive Plan Year Three | Performance Units | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Payout range 200.00%