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v2.4.1.9

Commitments and Contingencies (Purchase Commitments) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 26, 2014 locomotives | Dec. 27, 2013 locomotives | Dec. 28, 2012 locomotives
Unrecorded Unconditional Purchase Obligation [Line Items] |  |  |
Percentage of Locomotive Fleet Under Long-Term Maintenance Program | 42.00%csx_PercentageOfLocomotiveFleetUnderLongTermMaintenanceProgram |  |
Amounts Paid | $ 247 us-gaap_CostOfServicesMaintenanceCosts | $ 287 us-gaap_CostOfServicesMaintenanceCosts | $ 287 us-gaap_CostOfServicesMaintenanceCosts
Number of locomotives under the long term maintenance plan | 1,886 csx_NumberOfLocomotivesUnderLongTermMaintenancePlan | 1,886 csx_NumberOfLocomotivesUnderLongTermMaintenancePlan | 1,899 csx_NumberOfLocomotivesUnderLongTermMaintenancePlan
Unrecorded Unconditional Purchase Obligation [Abstract] |  |  |
2014 | 963 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary |  |
2015 | 496 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary |  |
2016 | 190 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary |  |
2017 | 181 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary |  |
2018 | 170 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary |  |
Thereafter | 1,272 us-gaap_UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears |  |
Total | 3,272 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount |  |
Locomotive & Maintenance Payments [Member] |  |  |
Unrecorded Unconditional Purchase Obligation [Abstract] |  |  |
2014 | 727 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = csx_LocomotivePurchaseObligationsMember |  |
2015 | 474 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = csx_LocomotivePurchaseObligationsMember |  |
2016 | 177 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = csx_LocomotivePurchaseObligationsMember |  |
2017 | 169 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = csx_LocomotivePurchaseObligationsMember |  |
2018 | 159 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = csx_LocomotivePurchaseObligationsMember |  |
Thereafter | 1,203 us-gaap_UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = csx_LocomotivePurchaseObligationsMember |  |
Total | 2,909 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = csx_LocomotivePurchaseObligationsMember |  |
Other Commitments [Member] |  |  |
Unrecorded Unconditional Purchase Obligation [Abstract] |  |  |
2014 | 236 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = csx_OtherPurchaseObligationsMember |  |
2015 | 22 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = csx_OtherPurchaseObligationsMember |  |
2016 | 13 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = csx_OtherPurchaseObligationsMember |  |
2017 | 12 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = csx_OtherPurchaseObligationsMember |  |
2018 | 11 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = csx_OtherPurchaseObligationsMember |  |
Thereafter | 69 us-gaap_UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = csx_OtherPurchaseObligationsMember |  |
Total | $ 363 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = csx_OtherPurchaseObligationsMember |  |

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- Definition Maintenance costs incurred and directly related to services rendered by an entity during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(d)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308 + Details
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- Definition Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308 + Details
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- Definition Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308 + Details
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- Definition Amount of the unrecorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308 + Details
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