Nature of Operations and Significant Accounting Policies (Business) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended												12 Months Ended
	Dec. 27, 2013 states mi railroads employees	Sep. 27, 2013	Jun. 28, 2013	Mar. 29, 2013	Dec. 30, 2012	Sep. 28, 2012	Jun. 29, 2012	Mar. 30, 2012	Dec. 30, 2011	Sep. 30, 2011	Jul. 01, 2011	Apr. 01, 2011	Dec. 27, 2013 employees states mi railroads	Dec. 28, 2012		Dec. 30, 2011
Revenue from External Customer [Line Items]
Entity Number of Employees	31,000												31,000
Number of Union Employees													26,000
Total number of rail route miles	21,000												21,000
Rail network states number	23												23
Number of short-line and regional railroads served	240												240
Revenue	$ 3,032	$ 2,985	$ 3,046	$ 2,963	$ 2,895	$ 2,864	$ 2,986	$ 3,018	$ 2,993	$ 2,962	$ 3,013	$ 2,827	$ 12,026	$ 11,763	[1]	$ 11,795	[1]
Minimum [Member]
Revenue from External Customer [Line Items]
Number of ocean, river and lake ports serviced	70												70
Merchandise business [Member]
Revenue from External Customer [Line Items]
Number of carloads													2,800,000
Percentage of total revenue													59.00%
Percentage of total volume													42.00%
Coal business [Member]
Revenue from External Customer [Line Items]
Number of carloads													1,200,000
Percentage of total revenue													24.00%
Percentage of total volume													18.00%
Intermodal business [Member]
Revenue from External Customer [Line Items]
Percentage of total revenue													14.00%
Percentage of total volume													40.00%
Minimum number of terminals	50												50
Other business [Member]
Revenue from External Customer [Line Items]
Percentage of total revenue													3.00%

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