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Stock Plans and Share-Based Compensation (Long-term Incentive Plans) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended 0 Months Ended
Dec. 26, 2014
Dec. 27, 2013
Dec. 28, 2012
May 07, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total expense incurred due to long-term incentive plans $ 33us-gaap_AllocatedShareBasedCompensationExpense $ 14us-gaap_AllocatedShareBasedCompensationExpense $ 14us-gaap_AllocatedShareBasedCompensationExpense  
Long-term Incentive Plans [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of payout subject to reduction (30.00%)csx_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPayoutPercentageIncreaseDecrease
/ us-gaap_PlanNameAxis
= csx_LongTermIncentivePlansMember		      
Total expense incurred due to long-term incentive plans 19us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= csx_LongTermIncentivePlansMember		 2us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= csx_LongTermIncentivePlansMember		 3us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= csx_LongTermIncentivePlansMember		  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]        
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		    
Long-term Incentive Plans [Member] | Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]        
Payout Range 0.00%csx_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPayoutPercentage
/ us-gaap_PlanNameAxis
= csx_LongTermIncentivePlansMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		      
Long-term Incentive Plans [Member] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]        
Payout Range 200.00%csx_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPayoutPercentage
/ us-gaap_PlanNameAxis
= csx_LongTermIncentivePlansMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		      
Performance Shares [Member] | Two Thousand Thirteen Long-Term Incentive Plan (2013 LTIP) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage Of Grants With Performance Vesting, Operating Ratio       50.00%csx_PercentageOfGrantsWithPerformanceVestingOperatingRatio
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= csx_TwoThousandThirteenLongTermIncentivePlan2013LTIPMember
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]        
Percentage Of Grants With Performance Vesting, Return On Assets       50.00%csx_PercentageOfGrantsWithPerformanceVestingReturnOnAssets
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= csx_TwoThousandThirteenLongTermIncentivePlan2013LTIPMember
Performance Units [Member] | Long-term Incentive Plans [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
= csx_PerformanceUnitsMember
/ us-gaap_PlanNameAxis
= csx_LongTermIncentivePlansMember		      
Number of plans 3csx_ShareBasedCompensationArrangementByShareBasePaymentAwardNumberOfPlans
/ us-gaap_AwardTypeAxis
= csx_PerformanceUnitsMember
/ us-gaap_PlanNameAxis
= csx_LongTermIncentivePlansMember		      
Plan duration 3 years      
Restricted Stock Units (RSUs) [Member] | Long Term Incentive Plan - 2014 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]        
Number of target units outstanding 1,338,000csx_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardsOutstanding
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= csx_LongTermIncentivePlanYearOneMember		 [1]      
Weighted-average fair value at grant date $ 22.23us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= csx_LongTermIncentivePlanYearOneMember		 [1]      
Restricted Stock Units (RSUs) [Member] | Long Term Incentive Plan - 2014 [Member] | Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]        
Payout Range 0.00%csx_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPayoutPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= csx_LongTermIncentivePlanYearOneMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		      
Restricted Stock Units (RSUs) [Member] | Long Term Incentive Plan - 2014 [Member] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]        
Payout Range 200.00%csx_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPayoutPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= csx_LongTermIncentivePlanYearOneMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		      
Restricted Stock Units (RSUs) [Member] | Long Term Incentive Plan - 2015 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]        
Number of target units outstanding 1,330,000csx_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardsOutstanding
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= csx_LongTermIncentivePlanYearTwoMember		 [1]      
Weighted-average fair value at grant date $ 25.50us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= csx_LongTermIncentivePlanYearTwoMember		 [1]      
Restricted Stock Units (RSUs) [Member] | Long Term Incentive Plan - 2015 [Member] | Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]        
Payout Range 0.00%csx_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPayoutPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= csx_LongTermIncentivePlanYearTwoMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		      
Restricted Stock Units (RSUs) [Member] | Long Term Incentive Plan - 2015 [Member] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]        
Payout Range 200.00%csx_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPayoutPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= csx_LongTermIncentivePlanYearTwoMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		      
Restricted Stock Units (RSUs) [Member] | Long Term Incentive Plan - 2016 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]        
Number of target units outstanding 1,119,000csx_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardsOutstanding
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= csx_LongTermIncentivePlanYearThreeMember		 [1]      
Weighted-average fair value at grant date $ 28.03us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= csx_LongTermIncentivePlanYearThreeMember		 [1]      
Restricted Stock Units (RSUs) [Member] | Long Term Incentive Plan - 2016 [Member] | Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]        
Payout Range 0.00%csx_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPayoutPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= csx_LongTermIncentivePlanYearThreeMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		      
Restricted Stock Units (RSUs) [Member] | Long Term Incentive Plan - 2016 [Member] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]        
Payout Range 200.00%csx_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPayoutPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= csx_LongTermIncentivePlanYearThreeMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		      
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		      
Total expense incurred due to long-term incentive plans $ 11us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 [2] $ 10us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 [2] $ 9us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 [2]  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]        
Number of target units outstanding 1,383,000csx_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardsOutstanding
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 [2] 1,462,000csx_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardsOutstanding
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 [2] 1,353,000csx_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardsOutstanding
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 [2]  
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		  
[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.
[2] 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.