Casualty, Environmental and Other Reserves - Narrative (Details)	3 Months Ended
	Mar. 31, 2017 USD ($) claim site	Dec. 30, 2016 USD ($)
All Contingencies Reserves [Line Items]
Total reserves	$ 366,000,000	$ 374,000,000
Casualty
All Contingencies Reserves [Line Items]
Total reserves	226,000,000	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	$ 93,000,000	95,000,000
Environmental impaired sites | site	222
Other
All Contingencies Reserves [Line Items]
Total reserves	$ 47,000,000	$ 50,000,000
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