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Related Party Transactions (Narrative) (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 31, 2014 | Dec. 25, 2015 | Dec. 26, 2014 | Dec. 27, 2013
Related Party Transaction [Line Items] |  |  |  |
Short term payable to related party |  | $ 0 | $ 0 |
Corporate Joint Venture [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Difference between carrying amount and underlying equity |  | 353 |  |
Interest expense |  | $ 6 | 3 | $ 4
TTX Company [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Percentage economic interest in related party |  | 20.00% |  |
Equity method investments |  | $ 443 |  |
Economic interest in related party which is also an equity method investment [Member] | Corporate Joint Venture [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Percentage economic interest in related party |  | 42.00% |  |
Voting interest in related party which is also an equity method investment [Member] | Corporate Joint Venture [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Percentage economic interest in related party |  | 50.00% |  |
CSXT Promissory Note Related Party October 2044 [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Accrued interest to related party | $ 3 |  |  |
Accounts Payable [Member] | Corporate Joint Venture [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Short term payable to related party |  | $ 65 | 54 |
Accounts Payable [Member] | TTX Company [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Short term payable to related party |  | 40 | 35 |
Accounts Payable [Member] | Related Party Accounts Payable Converted to a Note [Member] | Corporate Joint Venture [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Short term payable to related party | 125 |  |  |
Long-term Debt [Member] | CSXT Promissory Note Related Party March 2035 [Member] | Corporate Joint Venture [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Promissory note payable | $ 23 |  |  |
Related party note, interest rate | 4.52% |  |  |
Long-term Debt [Member] | CSX Promissory Note Related Party October 2035 [Member] | Corporate Joint Venture [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Promissory note payable | $ 73 |  |  |
Related party note, interest rate | 4.40% |  |  |
Long-term Debt [Member] | CSXT Promissory Note Related Party October 2044 [Member] | Corporate Joint Venture [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Promissory note payable |  | $ 151 | $ 151 |
Related party note, interest rate | 2.89% | 2.89% |  |
Long-term Debt [Member] | Total Related Party Promissory Notes, October 2044 [Member] | Corporate Joint Venture [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Promissory note payable | $ 224 |  |  |

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- Definition Amount of payable due to an entity that is affiliated with the reporting entity by means of direct or indirect ownership. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + 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 210.5-02.19(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(k)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 12 -Subparagraph 3 -Article 6 + Details
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