Other Income, Net (Tables)

12 Months Ended

Dec. 31, 2017

Other Income and Expenses [Abstract]

Other Income, Net

Other income, net for the years ended Dec. 31 consisted of the following:

(Millions of Dollars)	2017			2016			2015
Interest income	$	19		$	8		$	6
Other nonoperating income	7			3			4
Insurance policy expense	(3		)	(3		)	(4		)
Other income, net	$	23		$	8		$	6