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Related Party Transactions (Consolidated Balance Sheets Components) (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Oct. 31, 2014 | Dec. 25, 2015 | Dec. 26, 2014
Related Party Transaction [Line Items] |  |  |
Payable to Affiliates |  | $ 0 | $ 0
TTX Company [Member] | Accounts Payable [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Payable to Affiliates |  | 40 | 35
Corporate Joint Venture [Member] | Accounts Payable [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Payable to Affiliates |  | 65 | 54
Corporate Joint Venture [Member] | Long-term Debt [Member] | CSX Promissory Note Related Party October 2044 [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Promissory notes payable to Conrail subsidiary |  | $ 73 | 73
Related party note, interest rate |  | 2.89% |
Corporate Joint Venture [Member] | Long-term Debt [Member] | CSXT Promissory Note Related Party October 2044 [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Promissory notes payable to Conrail subsidiary |  | $ 151 | $ 151
Related party note, interest rate | 2.89% | 2.89% |

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