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Stock Plans and Share-Based Compensation (Long-term Incentive Plans) (Details) (USD $)
 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended
Dec. 30, 2011
Dec. 31, 2010
Dec. 25, 2009
Dec. 30, 2011
Long-term Incentive Plans [Member]
years
Dec. 31, 2010
Long-term Incentive Plans [Member]
Dec. 25, 2009
Long-term Incentive Plans [Member]
Jan. 31, 2012
Long-term Incentive Plans [Member]
Issuance of Equity [Member]
Dec. 30, 2011
Long-term Incentive Plans [Member]
Performance Units [Member]
Dec. 30, 2011
Long-term Incentive Plans [Member]
Restricted Stock Units (RSUs) [Member]
Dec. 31, 2010
Long-term Incentive Plans [Member]
Restricted Stock Units (RSUs) [Member]
Dec. 25, 2009
Long-term Incentive Plans [Member]
Restricted Stock Units (RSUs) [Member]
Dec. 30, 2011
Long Term Incentive Plan Year One [Member]
Dec. 31, 2010
Long Term Incentive Plan Year One [Member]
Dec. 30, 2011
Long Term Incentive Plan Year One [Member]
Restricted Stock Units (RSUs) [Member]
Dec. 30, 2011
Long Term Incentive Plan Year One [Member]
Restricted Stock Units (RSUs) [Member]
Minimum [Member]
May 31, 2011
Long Term Incentive Plan Year One [Member]
Restricted Stock Units (RSUs) [Member]
Maximum [Member]
Dec. 30, 2011
Long Term Incentive Plan Year Two [Member]
Dec. 31, 2010
Long Term Incentive Plan Year Two [Member]
Dec. 30, 2011
Long Term Incentive Plan Year Two [Member]
Restricted Stock Units (RSUs) [Member]
Dec. 30, 2011
Long Term Incentive Plan Year Two [Member]
Restricted Stock Units (RSUs) [Member]
Minimum [Member]
May 31, 2011
Long Term Incentive Plan Year Two [Member]
Restricted Stock Units (RSUs) [Member]
Maximum [Member]
Dec. 30, 2011
Long Term Incentive Plan Year Three [Member]
Dec. 31, 2010
Long Term Incentive Plan Year Three [Member]
Dec. 30, 2011
Long Term Incentive Plan Year Three [Member]
Restricted Stock Units (RSUs) [Member]
Dec. 30, 2011
Long Term Incentive Plan Year Three [Member]
Restricted Stock Units (RSUs) [Member]
Minimum [Member]
May 31, 2011
Long Term Incentive Plan Year Three [Member]
Restricted Stock Units (RSUs) [Member]
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                    
Performance unit equivalent of CSX stock, in shares               1                                    
Percentage of payout subject to reduction       (30.00%)                                            
Total expense incurred due to long-term incentive plans $ 30,000,000 $ 62,000,000 $ 17,000,000 $ 21,000,000 $ 56,000,000 $ 13,000,000                                        
Shares issued subsequent to year end as a result of achieving performance targets under the long-term incentive plan (in shares)             2,700,000                                      
Time Based Restricted Stock Unit Granted To Key Member Of Management                 361,000 402,000 658,000 25,000 158,000       41,000 1,235,000 402,000     1,111,000 0 361,000    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]                                                    
Number of target units outstanding                           1,966,000 [1]         1,224,000 [1]         1,097,000 [1]    
Weighted-average fair value at grant date       $ 24.69 $ 16.89                 $ 11.09 [1]         $ 18.14 [1]         $ 25.92 [1]    
Payout Range                             0.00% 233.00%       0.00% 200.00%       0.00% 200.00%
Unrecognized compensation cost       $ 17,000,000                                            
Expected weighted average period of recognition for unrecognized compensation cost (in years)       1.5                                            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]                                                    
Unvested, Units Outstanding, beginning balance                       1,942,000 1,788,000       1,183,000 0       0 0      
Unvested, Weighted-Average Fair Value at Grant Date, beginning balance       $ 14.43 $ 10.50                                          
Granted, Units Outstanding                 361,000 402,000 658,000 25,000 158,000       41,000 1,235,000 402,000     1,111,000 0 361,000    
Granted, Weighted-Average Fair Value at Grant Date       $ 24.69 $ 16.89                 $ 11.09 [1]         $ 18.14 [1]         $ 25.92 [1]    
Forfeited, Units Outstanding                       0 (4,000)       0 (52,000)       (14,000) 0      
Forfeited, Weighted-Average Fair Value at Grant Date       $ 23.93 $ 17.31                                          
Vested, Units Outstanding                       1,966,000         0         0        
Vested, Weighted-Average Fair Value at Grant Date       $ 11.09                                            
Unvested, Units Outstanding, ending balance                       0 1,942,000       1,224,000 1,183,000       1,097,000 0      
Unvested, Weighted-Average Fair Value at Grant Date, ending balance       $ 22.03 $ 14.43 $ 10.50                                        
[1] Number of target units granted and weighted-average fair value calculations above include the value of both initial grants and subsequent, smaller grants issued at different prices based on grant date fair value to new or promoted employees not previously included.