Casualty, Environmental and Other Reserves - Narrative (Details)	6 Months Ended
	Jun. 30, 2017 USD ($) claim site	Dec. 30, 2016 USD ($)
All Contingencies Reserves [Line Items]
Total reserves	$ 363,000,000	$ 374,000,000
Minimum
All Contingencies Reserves [Line Items]
Loss contingency, latency period (in years)	10 years
Maximum
All Contingencies Reserves [Line Items]
Loss contingency, latency period (in years)	40 years
Casualty
All Contingencies Reserves [Line Items]
Total reserves	$ 223,000,000	229,000,000
Self-insured retention amount, per occurrence	$ 50,000,000
Number of individual claims expected to exceed self insured retention amount | claim	0
Environmental
All Contingencies Reserves [Line Items]
Total reserves	$ 87,000,000	95,000,000
Environmental impaired sites | site	229
Other
All Contingencies Reserves [Line Items]
Total reserves	$ 53,000,000	$ 50,000,000