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Other Income - Net (Details) (USD $) In Millions, unless otherwise specified | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2014 | Dec. 26, 2014 | Dec. 27, 2013 | Dec. 28, 2012
Other Income and Expenses [Abstract] |  |  |  |  |  |  |
Interest Income |  | $ 5 us-gaap_InterestIncomeExpenseNonoperatingNet |  | $ 8 us-gaap_InterestIncomeExpenseNonoperatingNet |  | $ 5 us-gaap_InterestIncomeExpenseNonoperatingNet |
Income from Real Estate Operations |  | 23 csx_IncomefromRealEstateOperations |  | 23 csx_IncomefromRealEstateOperations |  | 81 csx_IncomefromRealEstateOperations |
Miscellaneous Expense |  | (52)us-gaap_OtherIncome | [1] | (20)us-gaap_OtherIncome | [1] | (13)us-gaap_OtherIncome | [1]
Total Other (Expense) Income - Net |  | (24)us-gaap_OtherNonoperatingIncomeExpense |  | 11 us-gaap_OtherNonoperatingIncomeExpense |  | 73 us-gaap_OtherNonoperatingIncomeExpense |
Gross Revenue from Real Estate Operations included above |  | 47 csx_RealEstateRevenueGross |  | 48 csx_RealEstateRevenueGross |  | 106 csx_RealEstateRevenueGross |
Change in Miscellaneous Expense |  | 32 csx_IncreaseDecreaseinOtherIncome |  |  |  |  |
Environmental Remediation Expense |  | 17 us-gaap_EnvironmentalRemediationExpense |  |  |  |  |
Other expense recognized for early redemption premium | $ 16 us-gaap_GainsLossesOnExtinguishmentOfDebt |  |  |  |  |  |
[1] | Miscellaneous expense increased $32 million primarily due to an increase in estimated environmental cleanup costs of $17 million related to non-operating activities as well as costs of $16 million associated with the early redemption of long-term debt.

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- Definition Amount, before tax, of non-operating real estate sales, leasing, acquisition, and management and development activities + References No definition available. + Details
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- Definition The aggregate gross revenue from real estate operations included in Other Income - Net during the reporting period. + References No definition available. + Details
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- Definition The charge against earnings in the period for known or estimated future costs arising from requirements to perform environmental remediation activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13296-110859 + Details
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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12317-112629 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12355-112629 + Details
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- Definition Reflects the sum of all other revenue and income recognized by the entity in the period not otherwise specified in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.4) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 4 -Article 7 + Details
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- Definition The net amount of other income and expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income (expense) recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) net gains or losses on securities, (d) unusual costs, (e) gains or losses on foreign exchange transactions, and (f) miscellaneous other income and expense items. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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