Casualty, Environmental and Other Reserves - Schedule of Casualty, Environmental and Other Reserves (Details) - USD ($) $ in Millions	Mar. 25, 2016	Dec. 25, 2015
Loss Contingencies [Line Items]
Current	$ 130	$ 131
Long-term	255	269
Total	385	400
Total Casualty
Loss Contingencies [Line Items]
Current	68	69
Long-term	190	200
Total	258	269
Personal Injury
Loss Contingencies [Line Items]
Current	57	57
Long-term	143	147
Total	200	204
Asbestos
Loss Contingencies [Line Items]
Current	8	9
Long-term	39	44
Total	47	53
Occupational
Loss Contingencies [Line Items]
Current	3	3
Long-term	8	9
Total	11	12
Environmental
Loss Contingencies [Line Items]
Current	43	42
Long-term	37	40
Total	80	82
Other
Loss Contingencies [Line Items]
Current	19	20
Long-term	28	29
Total	$ 47	$ 49