Properties (Significant Property Disposition) (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended	1 Months Ended	12 Months Ended
	Nov. 30, 2011	Nov. 30, 2011	Dec. 27, 2013	Dec. 28, 2012		Dec. 30, 2011
Significant Acquisitions and Disposals [Line Items]
Total number of rail route miles			21,000
Proceeds from property dispositions			$ 53	$ 186	[1]	$ 240	[1]
Payments to Acquire Property, Plant, and Equipment			2,313	2,341	[1]	2,297	[1]
Other Current Liabilities [Member]
Significant Acquisitions and Disposals [Line Items]
Deferred gain on sale of real estate			9	43
Other Long-term Liabilities [Member]
Significant Acquisitions and Disposals [Line Items]
Deferred gain on sale of real estate			0	9
SunRail Transaction - Sale of Corridor [Member]
Significant Acquisitions and Disposals [Line Items]
Total number of rail route miles	61	61
Proceeds from property dispositions	173
Deferred gain on sale of real estate	160	160	9	52
Abnormal gains			43	94		14
SunRail Transaction - Sale of Corridor [Member] | Maximum [Member]
Significant Acquisitions and Disposals [Line Items]
Proceeds from property dispositions in form of government grants	259
SunRail Transaction - Sale of Corridor [Member] | Cash [Member]
Significant Acquisitions and Disposals [Line Items]
Proceeds from property dispositions	148
SunRail Transaction - Sale of Corridor [Member] | Accounts Receivable [Member]
Significant Acquisitions and Disposals [Line Items]
Proceeds from property dispositions in form of receivables held in escrow	25
Capital Addition Purchase Commitments [Member] | SunRail Transaction - Sale of Corridor [Member]
Significant Acquisitions and Disposals [Line Items]
Long-term purchase commitment	500
Long-term purchase commitment, period		8 years
Payments to Acquire Property, Plant, and Equipment			$ 142	$ 311		$ 47

[1] See the revision of prior period financial statements in Note 1. Nature of Operations and Significant Accounting Policies.