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Nature of Operations and Significant Accounting Policies (Amortization of Gain from Property Disposition) (Details) (USD $) In Millions, unless otherwise specified | 0 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Nov. 30, 2011 mi | Sep. 28, 2012 | Sep. 28, 2012 | Mar. 30, 2012 | Dec. 30, 2011
Significant Acquisitions and Disposals [Line Items] |  |  |  |  |
Total number of rail route miles |  | 21,000 | 21,000 |  |
SunRail Transaction - Sale of Corridor [Member] |  |  |  |  |
Significant Acquisitions and Disposals [Line Items] |  |  |  |  |
Total number of rail route miles | 61 |  |  |  |
Proceeds from sale of operating rail corridor | $ 173 |  |  |  |
Gain on sale of real estate |  | 30 | 69 |  |
Deferred gain on sale of real estate | 160 |  |  | 77 | 132
SunRail Transaction - Sale of Corridor [Member] | Current portion, included in Other Current Liabilities [Member] |  |  |  |  |
Significant Acquisitions and Disposals [Line Items] |  |  |  |  |
Deferred gain on sale of real estate |  |  |  | 68 | 95
SunRail Transaction - Sale of Corridor [Member] | Long term portion, included in Other Long-term Liabilities [Member] |  |  |  |  |
Significant Acquisitions and Disposals [Line Items] |  |  |  |  |
Deferred gain on sale of real estate |  |  |  | 9 | 37
SunRail Transaction - Sale of Corridor [Member] | Maximum [Member] |  |  |  |  |
Significant Acquisitions and Disposals [Line Items] |  |  |  |  |
Governmental grants received from sale of operating rail corridor | 259 |  |  |  |
Total consideration given from sale of operating rail corridor | 432 |  |  |  |
Capital Additions [Member] | SunRail Transaction - Sale of Corridor [Member] |  |  |  |  |
Significant Acquisitions and Disposals [Line Items] |  |  |  |  |
Obligation to invest in routine captial expenditures and maintenance |  |  | $ 500 |  |
Obligation to invest in routine captial expenditures and maintenance, term (in years) |  |  | 8 years |  |

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