Casualty, Environmental and Other Reserves - Schedule of Casualty, Environmental and Other Reserves (Details) - USD ($) $ in Millions	Sep. 23, 2016	Dec. 25, 2015
Loss Contingencies [Line Items]
Current	$ 124	$ 131
Long-term	250	269
Total	374	400
Total Casualty
Loss Contingencies [Line Items]
Current	65	69
Long-term	182	200
Total	247	269
Personal Injury
Loss Contingencies [Line Items]
Current	57	57
Long-term	135	147
Total	192	204
Asbestos
Loss Contingencies [Line Items]
Current	4	9
Long-term	42	44
Total	46	53
Occupational
Loss Contingencies [Line Items]
Current	4	3
Long-term	5	9
Total	9	12
Environmental
Loss Contingencies [Line Items]
Current	41	42
Long-term	38	40
Total	79	82
Other
Loss Contingencies [Line Items]
Current	18	20
Long-term	30	29
Total	$ 48	$ 49