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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 | $ 33 us-gaap_AllocatedShareBasedCompensationExpense |  | $ 14 us-gaap_AllocatedShareBasedCompensationExpense |  | $ 14 us-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 | 19 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = csx_LongTermIncentivePlansMember |  | 2 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = csx_LongTermIncentivePlansMember |  | 3 us-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 | $ 28.13 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = csx_LongTermIncentivePlansMember |  | $ 25.26 us-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 | 1 csx_ShareBasedCompensationArrangementByShareBasePaymentAwardNumberOfEquivalentSharesOfCommonStockPerUnit / us-gaap_AwardTypeAxis = csx_PerformanceUnitsMember / us-gaap_PlanNameAxis = csx_LongTermIncentivePlansMember |  |  |  |  |  |
Number of plans | 3 csx_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 | 1,338,000 csx_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardsOutstanding / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = csx_LongTermIncentivePlanYearOneMember | [1] |  |  |  |  |
Weighted-average fair value at grant date | $ 22.23 us-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 | 1,330,000 csx_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardsOutstanding / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = csx_LongTermIncentivePlanYearTwoMember | [1] |  |  |  |  |
Weighted-average fair value at grant date | $ 25.50 us-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 | 1,119,000 csx_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardsOutstanding / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = csx_LongTermIncentivePlanYearThreeMember | [1] |  |  |  |  |
Weighted-average fair value at grant date | $ 28.03 us-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 | 1 csx_ShareBasedCompensationArrangementByShareBasePaymentAwardNumberOfEquivalentSharesOfCommonStockPerUnit / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |  |  |  |  |
Total expense incurred due to long-term incentive plans | $ 11 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | [2] | $ 10 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | [2] | $ 9 us-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 | 1,383,000 csx_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardsOutstanding / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | [2] | 1,462,000 csx_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardsOutstanding / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | [2] | 1,353,000 csx_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardsOutstanding / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | [2] |
Weighted-average fair value at grant date | $ 25.03 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  | $ 23.89 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  | $ 21.38 us-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.

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- Definition The number of outstanding awards on nonstock option plans (for example, restricted stock plan, phantom stock plan, stock appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares. + References No definition available. + Details
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- Definition Payout percentage during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References No definition available. + Details
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- Definition Increase (decrease) in payout percentage made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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