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Stock Plans and Share-Based Compensation (Restricted Stock Grants) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 26, 2014
Dec. 27, 2013
Dec. 28, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted Stock Unit and Awards Expense $ 33us-gaap_AllocatedShareBasedCompensationExpense $ 14us-gaap_AllocatedShareBasedCompensationExpense $ 14us-gaap_AllocatedShareBasedCompensationExpense
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance unit equivalent of CSX stock, in shares 1csx_ShareBasedCompensationArrangementByShareBasePaymentAwardNumberOfEquivalentSharesOfCommonStockPerUnit
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
   
Share-based compensation arrangement, vesting period 5 years    
Unrecognized compensation cost 16us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
   
Expected weighted average period of recognition for unrecognized compensation cost (in years) 2 years    
Number of Restricted Stock Awards Outstanding 1,383,000csx_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardsOutstanding
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
[1] 1,462,000csx_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardsOutstanding
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
[1] 1,353,000csx_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardsOutstanding
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
[1]
Weighted-average fair value at grant date $ 25.03us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
$ 23.89us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
$ 21.38us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Restricted Stock Unit and Awards Expense 11us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
[1] 10us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
[1] 9us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
[1]
Unvested Restricted Stock Units and Awards Outstanding 601,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
705,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
629,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Weighted-Average Fair Value of Unvested Awards Outstanding $ 26.40us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
$ 24.17us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
$ 22.48us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation arrangement, vesting period 3 years    
Long-term Incentive Plans [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost 39us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_PlanNameAxis
= csx_LongTermIncentivePlansMember
   
Expected weighted average period of recognition for unrecognized compensation cost (in years) 2 years    
Weighted-average fair value at grant date $ 28.13us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= csx_LongTermIncentivePlansMember
$ 25.26us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= csx_LongTermIncentivePlansMember
 
Restricted Stock Unit and Awards Expense $ 19us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= csx_LongTermIncentivePlansMember
$ 2us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= csx_LongTermIncentivePlansMember
$ 3us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= csx_LongTermIncentivePlansMember
Weighted-Average Fair Value of Unvested Awards Outstanding $ 26.66us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= csx_LongTermIncentivePlansMember
$ 23.70us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= csx_LongTermIncentivePlansMember
$ 21.98us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= csx_LongTermIncentivePlansMember
Long-term Incentive Plans [Member] | Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation arrangement, vesting period 3 years    
Time Based Restricted Stock Unit Granted To Key Member Of Management 371,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= csx_LongTermIncentivePlansMember
524,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= csx_LongTermIncentivePlansMember
433,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= csx_LongTermIncentivePlansMember
[1] Time-based restricted stock units were granted to certain employees under the respective Long-term Incentive Plans in the amount of 371,000, 524,000, and 433,000 in 2014, 2013 and 2012, respectively, as described below. These units vest over three years, therefore only a partial amount of expense was recognized in 2014, 2013, and 2012, respectively.