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Debt and Credit Agreements (Debt Issuance and Early Redemption of Long-term Debt) (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 26, 2014 | Dec. 25, 2015
Debt Instrument [Line Items] |  |
Other expense recognized for early redemption premium | $ 16,000,000 |
Early redemption amount | 663,000,000 |
Unsecured Debt [Member] | Three Point Nine Five Percent Notes Due 2050 [Member] |  |
Debt Instrument [Line Items] |  |
Face amount of debt issued |  | $ 600,000,000
Notes issued, interest rate |  | 3.95%
Unsecured Debt [Member] | Three Point Three Five Percent Notes Due 2025 [Member] [Domain] |  |
Debt Instrument [Line Items] |  |
Face amount of debt issued |  | $ 600,000,000
Notes issued, interest rate |  | 3.35%
Unsecured Debt [Member] | Three Point Four Percent Notes Due 2024 [Member] |  |
Debt Instrument [Line Items] |  |
Face amount of debt issued | $ 550,000,000 |
Notes issued, interest rate | 3.40% |
Unsecured Debt [Member] | Four Point Five Percent Notes Due 2054 [Member] |  |
Debt Instrument [Line Items] |  |
Face amount of debt issued | $ 450,000,000 |
Notes issued, interest rate | 4.50% |
Unsecured Debt [Member] | CSX's Notes Payable Maturing April 1, 2015 [Member] |  |
Debt Instrument [Line Items] |  |
Face amount of debt issued | $ 400,000,000 |
Notes issued, interest rate | 6.25% |
Equipment Obligations [Member] | Secured Equipment Notes Due October 15, 2014 [Member] |  |
Debt Instrument [Line Items] |  |
Face amount of debt issued | $ 263,000,000 |
Notes issued, interest rate | 8.375% |

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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