Net Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2018

Net Property, Plant and Equipment

Summary of property, plant and equipment

	Useful				December 31,
(Millions of dollars)	Lives				2018		2017
Land and improvements	3	-	15	years	$	238	$	224
Buildings and improvements			30	years		591		525
Machinery and equipment	3	-	20	years		1,298		1,253
Vessels and vehicles	3	-	18	years		147		136
Office furniture and fixtures			5	years		36		34
Construction in progress						96		56
						2,406		2,228
Accumulated depreciation and amortization						(1,246)		(1,151)
Net property, plant and equipment					$	1,160	$	1,077