Casualty, Environmental and Other Reserves - Schedule of Casualty, Environmental and Other Reserves (Details) - USD ($) $ in Millions	Jun. 24, 2016	Dec. 25, 2015
Loss Contingencies [Line Items]
Current	$ 133	$ 131
Long-term	246	269
Total	379	400
Total Casualty
Loss Contingencies [Line Items]
Current	73	69
Long-term	173	200
Total	246	269
Personal Injury
Loss Contingencies [Line Items]
Current	57	57
Long-term	134	147
Total	191	204
Asbestos
Loss Contingencies [Line Items]
Current	12	9
Long-term	34	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	43	40
Total	84	82
Other
Loss Contingencies [Line Items]
Current	19	20
Long-term	30	29
Total	$ 49	$ 49