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Casualty, Environmental and Other Reserves (Loss Contingencies Accrual) (Details) (USD $) In Millions, unless otherwise specified | Dec. 26, 2014 | Dec. 27, 2013 | Dec. 28, 2012 | Dec. 30, 2011
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Contingencies [Line Items] |  |  |  |
Casualty, Environmental and Other Reserves | $ 142 us-gaap_LossContingencyAccrualCarryingValueCurrent | $ 151 us-gaap_LossContingencyAccrualCarryingValueCurrent |  |
Loss Contingency, Accrual, Noncurrent | 276 us-gaap_LossContingencyAccrualCarryingValueNoncurrent | 300 us-gaap_LossContingencyAccrualCarryingValueNoncurrent |  |
Casualty [Member] |  |  |  |
Contingencies [Line Items] |  |  |  |
Casualty, Environmental and Other Reserves | 76 us-gaap_LossContingencyAccrualCarryingValueCurrent / us-gaap_LossContingenciesByNatureOfContingencyAxis = csx_TotalCasualtyMember | 72 us-gaap_LossContingencyAccrualCarryingValueCurrent / us-gaap_LossContingenciesByNatureOfContingencyAxis = csx_TotalCasualtyMember |  |
Loss Contingency, Accrual, Noncurrent | 189 us-gaap_LossContingencyAccrualCarryingValueNoncurrent / us-gaap_LossContingenciesByNatureOfContingencyAxis = csx_TotalCasualtyMember | 208 us-gaap_LossContingencyAccrualCarryingValueNoncurrent / us-gaap_LossContingenciesByNatureOfContingencyAxis = csx_TotalCasualtyMember |  |
Loss Contingency Accrual | 265 us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = csx_TotalCasualtyMember | 280 us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = csx_TotalCasualtyMember | 325 us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = csx_TotalCasualtyMember | 372 us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = csx_TotalCasualtyMember
Personal Injury [Member] |  |  |  |
Contingencies [Line Items] |  |  |  |
Casualty, Environmental and Other Reserves | 68 us-gaap_LossContingencyAccrualCarryingValueCurrent / us-gaap_LossContingenciesByNatureOfContingencyAxis = csx_PersonalInjuryCasualtyMember | 59 us-gaap_LossContingencyAccrualCarryingValueCurrent / us-gaap_LossContingenciesByNatureOfContingencyAxis = csx_PersonalInjuryCasualtyMember |  |
Loss Contingency, Accrual, Noncurrent | 123 us-gaap_LossContingencyAccrualCarryingValueNoncurrent / us-gaap_LossContingenciesByNatureOfContingencyAxis = csx_PersonalInjuryCasualtyMember | 148 us-gaap_LossContingencyAccrualCarryingValueNoncurrent / us-gaap_LossContingenciesByNatureOfContingencyAxis = csx_PersonalInjuryCasualtyMember |  |
Loss Contingency Accrual | 191 us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = csx_PersonalInjuryCasualtyMember | 207 us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = csx_PersonalInjuryCasualtyMember |  |
Occupational [Member] |  |  |  |
Contingencies [Line Items] |  |  |  |
Casualty, Environmental and Other Reserves | 3 us-gaap_LossContingencyAccrualCarryingValueCurrent / us-gaap_LossContingenciesByNatureOfContingencyAxis = csx_OccupationalCasualtyMember | 3 us-gaap_LossContingencyAccrualCarryingValueCurrent / us-gaap_LossContingenciesByNatureOfContingencyAxis = csx_OccupationalCasualtyMember |  |
Loss Contingency, Accrual, Noncurrent | 15 us-gaap_LossContingencyAccrualCarryingValueNoncurrent / us-gaap_LossContingenciesByNatureOfContingencyAxis = csx_OccupationalCasualtyMember | 20 us-gaap_LossContingencyAccrualCarryingValueNoncurrent / us-gaap_LossContingenciesByNatureOfContingencyAxis = csx_OccupationalCasualtyMember |  |
Loss Contingency Accrual | 18 us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = csx_OccupationalCasualtyMember | 23 us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = csx_OccupationalCasualtyMember |  |
Asbestos [Member] |  |  |  |
Contingencies [Line Items] |  |  |  |
Casualty, Environmental and Other Reserves | 5 us-gaap_LossContingencyAccrualCarryingValueCurrent / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_AsbestosIssueMember | 10 us-gaap_LossContingencyAccrualCarryingValueCurrent / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_AsbestosIssueMember |  |
Loss Contingency, Accrual, Noncurrent | 51 us-gaap_LossContingencyAccrualCarryingValueNoncurrent / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_AsbestosIssueMember | 40 us-gaap_LossContingencyAccrualCarryingValueNoncurrent / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_AsbestosIssueMember |  |
Loss Contingency Accrual | 56 us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_AsbestosIssueMember | 50 us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_AsbestosIssueMember |  |
Environmental [Member] |  |  |  |
Contingencies [Line Items] |  |  |  |
Casualty, Environmental and Other Reserves | 48 us-gaap_LossContingencyAccrualCarryingValueCurrent / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_EnvironmentalIssueMember | 59 us-gaap_LossContingencyAccrualCarryingValueCurrent / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_EnvironmentalIssueMember |  |
Loss Contingency, Accrual, Noncurrent | 46 us-gaap_LossContingencyAccrualCarryingValueNoncurrent / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_EnvironmentalIssueMember | 41 us-gaap_LossContingencyAccrualCarryingValueNoncurrent / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_EnvironmentalIssueMember |  |
Loss Contingency Accrual | 94 us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_EnvironmentalIssueMember | 100 us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_EnvironmentalIssueMember | 88 us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_EnvironmentalIssueMember | 83 us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_EnvironmentalIssueMember
Other Reserves [Member] |  |  |  |
Contingencies [Line Items] |  |  |  |
Casualty, Environmental and Other Reserves | 18 us-gaap_LossContingencyAccrualCarryingValueCurrent / us-gaap_LossContingenciesByNatureOfContingencyAxis = csx_OtherReservesMember | 20 us-gaap_LossContingencyAccrualCarryingValueCurrent / us-gaap_LossContingenciesByNatureOfContingencyAxis = csx_OtherReservesMember |  |
Loss Contingency, Accrual, Noncurrent | 41 us-gaap_LossContingencyAccrualCarryingValueNoncurrent / us-gaap_LossContingenciesByNatureOfContingencyAxis = csx_OtherReservesMember | 51 us-gaap_LossContingencyAccrualCarryingValueNoncurrent / us-gaap_LossContingenciesByNatureOfContingencyAxis = csx_OtherReservesMember |  |
Loss Contingency Accrual | 59 us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = csx_OtherReservesMember | 71 us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = csx_OtherReservesMember | 64 us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = csx_OtherReservesMember | 64 us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = csx_OtherReservesMember
Casualty, Environmental and Other [Member] |  |  |  |
Contingencies [Line Items] |  |  |  |
Casualty, Environmental and Other Reserves | 142 us-gaap_LossContingencyAccrualCarryingValueCurrent / csx_CasualtyEnvironmentalandOtherAxis = csx_CasualtyEnvironmentalandOtherMember | 151 us-gaap_LossContingencyAccrualCarryingValueCurrent / csx_CasualtyEnvironmentalandOtherAxis = csx_CasualtyEnvironmentalandOtherMember |  |
Loss Contingency, Accrual, Noncurrent | 276 us-gaap_LossContingencyAccrualCarryingValueNoncurrent / csx_CasualtyEnvironmentalandOtherAxis = csx_CasualtyEnvironmentalandOtherMember | 300 us-gaap_LossContingencyAccrualCarryingValueNoncurrent / csx_CasualtyEnvironmentalandOtherAxis = csx_CasualtyEnvironmentalandOtherMember |  |
Loss Contingency Accrual | $ 418 us-gaap_LossContingencyAccrualAtCarryingValue / csx_CasualtyEnvironmentalandOtherAxis = csx_CasualtyEnvironmentalandOtherMember | $ 451 us-gaap_LossContingencyAccrualAtCarryingValue / csx_CasualtyEnvironmentalandOtherAxis = csx_CasualtyEnvironmentalandOtherMember | $ 477 us-gaap_LossContingencyAccrualAtCarryingValue / csx_CasualtyEnvironmentalandOtherAxis = csx_CasualtyEnvironmentalandOtherMember | $ 519 us-gaap_LossContingencyAccrualAtCarryingValue / csx_CasualtyEnvironmentalandOtherAxis = csx_CasualtyEnvironmentalandOtherMember

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- Definition Amount of loss contingency liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 + Details
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- Definition Amount of loss contingency liability expected to be resolved within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 + Details
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- Definition Amount of loss contingency liability expected to be resolved after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 + Details
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