Net Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2015

Net Property, Plant and Equipment

Summary of property, plant and equipment

	Useful				December 31,
(Millions of dollars)	Lives				2015		2014
Land and improvements	3	-	15	years	$	185	$	185
Buildings and improvements			30	years		405		389
Machinery and equipment	3	-	20	years		1,025		1,001
Vessels and vehicles	3	-	18	years		150		160
Office furniture and fixtures			5	years		27		26
Construction in progress						38		26
						1,830		1,787
Accumulated depreciation and amortization						(999)		(940)
Net property, plant and equipment					$	831	$	847