Other Income, Net (Tables)

3 Months Ended

Mar. 31, 2018

Other Income and Expenses [Abstract]

Other Income, Net

Other income, net consisted of the following:

	Three Months Ended March 31
(Millions of Dollars)	2018			2017
Interest income	$	5		$	4
Other nonoperating income	1			4
Benefits non-service cost	(5		)	(6		)
Insurance policy expense	—			(1		)
Other income, net	$	1		$	1