Casualty, Environmental and Other Reserves (Details) (USD $) In Millions, unless otherwise specified	Sep. 28, 2012 claims		Dec. 30, 2011		Jun. 01, 2010	May 31, 2010
All Contingencies Reserves [Line Items]
Casualty, environmental and other reserves, current	$ 169		$ 167
Casualty, environmental and other reserves, Long-term	319		352
Casualty, environmental and other reserves, Total	488		519
Casualty [Member]
All Contingencies Reserves [Line Items]
Casualty, environmental and other reserves, current	110		110
Casualty, environmental and other reserves, Long-term	234		262
Casualty, environmental and other reserves, Total	344		372
Self-insured retention amount					50	25
Number of Claims Expected to Exceed Self Insured Retention Amount	0
Personal Injury [Member]
All Contingencies Reserves [Line Items]
Casualty, environmental and other reserves, current	93		93
Casualty, environmental and other reserves, Long-term	151		168
Casualty, environmental and other reserves, Total	244		261
Occupational [Member]
All Contingencies Reserves [Line Items]
Casualty, environmental and other reserves, current	6		6
Casualty, environmental and other reserves, Long-term	31		37
Casualty, environmental and other reserves, Total	37		43
Asbestos [Member]
All Contingencies Reserves [Line Items]
Casualty, environmental and other reserves, current	11		11
Casualty, environmental and other reserves, Long-term	52		57
Casualty, environmental and other reserves, Total	63		68
Environmental [Member]
All Contingencies Reserves [Line Items]
Casualty, environmental and other reserves, current	39		31
Casualty, environmental and other reserves, Long-term	40		52
Casualty, environmental and other reserves, Total	79		83
Environmental impaired sites	256
Other [Member]
All Contingencies Reserves [Line Items]
Casualty, environmental and other reserves, current	20	[1]	26	[1]
Casualty, environmental and other reserves, Long-term	45	[1]	38	[1]
Casualty, environmental and other reserves, Total	$ 65	[1]	$ 64	[1]

[1] Separation liabilities and freight rate dispute reserves have been reclassified to other current and long-term liabilities.