Net Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2016

Net Property, Plant and Equipment

Summary of property, plant and equipment

	Useful				December 31,
(Millions of dollars)	Lives				2016		2015
Land and improvements	3	-	15	years	$	214	$	185
Buildings and improvements			30	years		486		405
Machinery and equipment	3	-	20	years		1,142		1,025
Vessels and vehicles	3	-	18	years		140		150
Office furniture and fixtures			5	years		32		27
Construction in progress						58		38
						2,072		1,830
Accumulated depreciation and amortization						(1,066)		(999)
Net property, plant and equipment					$	1,006	$	831