Casualty, Environmental and Other Reserves - Schedule of Casualty, Environmental and Other Reserves (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 30, 2016
Loss Contingencies [Line Items]
Current	$ 115	$ 115
Long-term	248	259
Total	363	374
Total Casualty
Loss Contingencies [Line Items]
Current	49	53
Long-term	174	176
Total	223	229
Personal Injury
Loss Contingencies [Line Items]
Current	45	46
Long-term	118	124
Total	163	170
Occupational
Loss Contingencies [Line Items]
Current	4	7
Long-term	56	52
Total	60	59
Environmental
Loss Contingencies [Line Items]
Current	43	42
Long-term	44	53
Total	87	95
Other
Loss Contingencies [Line Items]
Current	23	20
Long-term	30	30
Total	$ 53	$ 50