Casualty, Environmental and Other Reserves (Casualty, Occupational and Asbestos Claims) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended													12 Months Ended							12 Months Ended
	Dec. 31, 2010		Dec. 25, 2009		Dec. 30, 2011 Occupational Casualty and Asbestos Issues [Member] claims	Dec. 31, 2010 Occupational Casualty and Asbestos Issues [Member] claims	Dec. 30, 2011 Occupational [Member] years	Dec. 31, 2010 Occupational [Member]		Dec. 30, 2011 Occupational [Member] Incurred but not reported claims [Member]	Dec. 31, 2010 Occupational [Member] Incurred but not reported claims [Member]	Dec. 30, 2011 Occupational [Member] Asserted claims [Member]	Dec. 31, 2010 Occupational [Member] Asserted claims [Member]	Dec. 30, 2011 Asbestos [Member]	Dec. 31, 2010 Asbestos [Member]		Dec. 30, 2011 Asbestos [Member] Incurred but not reported claims [Member]	Dec. 31, 2010 Asbestos [Member] Incurred but not reported claims [Member]	Dec. 30, 2011 Asbestos [Member] Asserted claims [Member]	Dec. 31, 2010 Asbestos [Member] Asserted claims [Member]	Dec. 30, 2011 Carpal Tunnel Claims [Member] years
Loss Contingencies [Line Items]
Loss contingency, latency period (in years)														10 to 40 years
Time period for estimating probable claims (in years)							7														3
Undiscounted liabilities related to occupational and asbestos claims							$ 43	$ 40		$ 26	$ 25	$ 17	$ 15	$ 68	$ 81		$ 42	$ 40	$ 26	$ 41
Loss Contingency, Claims Quantities [Roll Forward]
Open Claims - Beginning of Year					1,376	3,782
New Claims Filed					224	250
Claims Settled					(370)	(287)
Claims Dismissed					(484)	(2,369)
Open Claims - End of Year					746	1,376
Change in Estimate	$ (49)	[1]	$ (127)	[1]				$ 12	[1]						$ 13	[1]

[1] Changes in estimates in 2010 and 2009 are the result of continued safety improvements and decreasing claim trends for both personal injury and occupational injuries. See below for more detailed discussion regarding these changes in estimates.