Casualty, Environmental and Other Reserves (Details) (USD $) In Millions, unless otherwise specified	Mar. 28, 2014	Dec. 27, 2013
All Contingencies Reserves [Line Items]
Loss Contingency, Accrual, Current	$ 149	$ 151
Loss Contingency, Accrual, Noncurrent	285	300
Casualty [Member]
All Contingencies Reserves [Line Items]
Loss Contingency, Accrual, Current	73	72
Loss Contingency, Accrual, Noncurrent	199	208
Loss Contingency, Accrual, Total	272	280
Self-insured retention amount, per occurrence	50
Number of Claims Expected to Exceed Self Insured Retention Amount	0
Personal Injury [Member]
All Contingencies Reserves [Line Items]
Loss Contingency, Accrual, Current	60	59
Loss Contingency, Accrual, Noncurrent	139	148
Loss Contingency, Accrual, Total	199	207
Occupational [Member]
All Contingencies Reserves [Line Items]
Loss Contingency, Accrual, Current	3	3
Loss Contingency, Accrual, Noncurrent	20	20
Loss Contingency, Accrual, Total	23	23
Asbestos [Member]
All Contingencies Reserves [Line Items]
Loss Contingency, Accrual, Current	10	10
Loss Contingency, Accrual, Noncurrent	40	40
Loss Contingency, Accrual, Total	50	50
Environmental [Member]
All Contingencies Reserves [Line Items]
Loss Contingency, Accrual, Current	59	59
Loss Contingency, Accrual, Noncurrent	38	41
Loss Contingency, Accrual, Total	97	100
Environmental impaired sites	256
Other [Member]
All Contingencies Reserves [Line Items]
Loss Contingency, Accrual, Current	17	20
Loss Contingency, Accrual, Noncurrent	48	51
Loss Contingency, Accrual, Total	65	71
Casualty, Environmental and Other [Member]
All Contingencies Reserves [Line Items]
Loss Contingency, Accrual, Current	149	151
Loss Contingency, Accrual, Noncurrent	285	300
Loss Contingency, Accrual, Total	$ 434	$ 451