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Casualty, Environmental and Other Reserves (Occupational and Asbestos Claims) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 26, 2014 claims | Dec. 27, 2013 claims
Occupational Casualty and Asbestos Issues [Member] |  |
Loss Contingency, Claims Quantities [Roll Forward] |  |
Open Claims - Beginning of Year | 392 us-gaap_LossContingencyPendingClaimsNumber / us-gaap_LossContingenciesByNatureOfContingencyAxis = csx_OccupationalCasualtyAndAsbestosIssuesMember | 523 us-gaap_LossContingencyPendingClaimsNumber / us-gaap_LossContingenciesByNatureOfContingencyAxis = csx_OccupationalCasualtyAndAsbestosIssuesMember
New Claims Filed | 136 us-gaap_LossContingencyNewClaimsFiledNumber / us-gaap_LossContingenciesByNatureOfContingencyAxis = csx_OccupationalCasualtyAndAsbestosIssuesMember | 165 us-gaap_LossContingencyNewClaimsFiledNumber / us-gaap_LossContingenciesByNatureOfContingencyAxis = csx_OccupationalCasualtyAndAsbestosIssuesMember
Claims Settled | (128)us-gaap_LossContingencyClaimsSettledNumber / us-gaap_LossContingenciesByNatureOfContingencyAxis = csx_OccupationalCasualtyAndAsbestosIssuesMember | (146)us-gaap_LossContingencyClaimsSettledNumber / us-gaap_LossContingenciesByNatureOfContingencyAxis = csx_OccupationalCasualtyAndAsbestosIssuesMember
Claims Dismissed | (130)us-gaap_LossContingencyClaimsDismissedNumber / us-gaap_LossContingenciesByNatureOfContingencyAxis = csx_OccupationalCasualtyAndAsbestosIssuesMember | (150)us-gaap_LossContingencyClaimsDismissedNumber / us-gaap_LossContingenciesByNatureOfContingencyAxis = csx_OccupationalCasualtyAndAsbestosIssuesMember
Open Claims - End of Year | 270 us-gaap_LossContingencyPendingClaimsNumber / us-gaap_LossContingenciesByNatureOfContingencyAxis = csx_OccupationalCasualtyAndAsbestosIssuesMember | 392 us-gaap_LossContingencyPendingClaimsNumber / us-gaap_LossContingenciesByNatureOfContingencyAxis = csx_OccupationalCasualtyAndAsbestosIssuesMember
Occupational [Member] |  |
Loss Contingencies [Line Items] |  |
Time period for estimating probable claims (in years) | 7 years |
Total liability | 18 us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = csx_OccupationalCasualtyMember | 23 us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = csx_OccupationalCasualtyMember
Occupational [Member] | Incurred but not reported claims [Member] |  |
Loss Contingencies [Line Items] |  |
Incurred but not reported claims | 12 csx_Incurredbutnotreportedclaims / csx_LossContingenciesByClaimTypeAxis = us-gaap_UnassertedClaimMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = csx_OccupationalCasualtyMember | 15 csx_Incurredbutnotreportedclaims / csx_LossContingenciesByClaimTypeAxis = us-gaap_UnassertedClaimMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = csx_OccupationalCasualtyMember
Occupational [Member] | Asserted claims [Member] |  |
Loss Contingencies [Line Items] |  |
Asserted claims | 6 csx_AssertedClaims / csx_LossContingenciesByClaimTypeAxis = us-gaap_InsuranceClaimsMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = csx_OccupationalCasualtyMember | 8 csx_AssertedClaims / csx_LossContingenciesByClaimTypeAxis = us-gaap_InsuranceClaimsMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = csx_OccupationalCasualtyMember
Asbestos [Member] |  |
Loss Contingencies [Line Items] |  |
Total liability | 56 us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_AsbestosIssueMember | 50 us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_AsbestosIssueMember
Asbestos [Member] | Incurred but not reported claims [Member] |  |
Loss Contingencies [Line Items] |  |
Incurred but not reported claims | 45 csx_Incurredbutnotreportedclaims / csx_LossContingenciesByClaimTypeAxis = us-gaap_UnassertedClaimMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_AsbestosIssueMember | 35 csx_Incurredbutnotreportedclaims / csx_LossContingenciesByClaimTypeAxis = us-gaap_UnassertedClaimMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_AsbestosIssueMember
Asbestos [Member] | Asserted claims [Member] |  |
Loss Contingencies [Line Items] |  |
Asserted claims | 11 csx_AssertedClaims / csx_LossContingenciesByClaimTypeAxis = us-gaap_InsuranceClaimsMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_AsbestosIssueMember | 15 csx_AssertedClaims / csx_LossContingenciesByClaimTypeAxis = us-gaap_InsuranceClaimsMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_AsbestosIssueMember
Carpal Tunnel Claims [Member] |  |
Loss Contingencies [Line Items] |  |
Time period for estimating probable claims (in years) | 3 years |
Minimum [Member] | Asbestos [Member] |  |
Loss Contingencies [Line Items] |  |
Loss contingency, latency period (in years) | 10 years |
Maximum [Member] | Asbestos [Member] |  |
Loss Contingencies [Line Items] |  |
Loss contingency, latency period (in years) | 40 years |

X
- Definition The loss contingency liability as of the balance sheet date which represents the cost of settling claims relating to events that have occurred and have been reported as of the date of the financial statements. + References No definition available. + Details
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Namespace Prefix: | csx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The loss contingency liability as of the balance sheet date which represents the cost of settling claims relating to events that have occurred but have not yet been reported as of the date of the financial statements. + References No definition available. + Details
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Namespace Prefix: | csx_
Data Type: | xbrli:monetaryItemType
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- Details
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- Definition Time period probable claim filings and claim values could be estimated with more certainty. + References No definition available. + Details
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- Definition Loss Contingency, Latency Period + References No definition available. + Details
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Data Type: | xbrli:durationItemType
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- Details
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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 Number of claims dismissed. + References No definition available. + Details
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Balance Type: | na
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- Definition Number of claims settled. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition The total number of new claims filed pertaining to a loss contingency during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of pending claims pertaining to a loss contingency. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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- Details
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- Details
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- Details
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- Details
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