Casualty, Environmental and Other Reserves - Schedule of Casualty, Environmental and Other Reserves (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 30, 2016
Loss Contingencies [Line Items]
Current	$ 122	$ 115
Long-term	253	259
Total	375	374
Total Casualty
Loss Contingencies [Line Items]
Current	49	53
Long-term	175	176
Total	224	229
Personal Injury
Loss Contingencies [Line Items]
Current	45	46
Long-term	120	124
Total	165	170
Occupational
Loss Contingencies [Line Items]
Current	4	7
Long-term	55	52
Total	59	59
Environmental
Loss Contingencies [Line Items]
Current	43	42
Long-term	46	53
Total	89	95
Other
Loss Contingencies [Line Items]
Current	30	20
Long-term	32	30
Total	$ 62	$ 50