Other Income, Net

6 Months Ended

Jun. 30, 2018

Other Income and Expenses [Abstract]

Other Income, Net

Other Expense, Net

Other expense, net consisted of the following:

	Three Months Ended June 30						Six Months Ended June 30
(Millions of Dollars)	2018			2017			2018			2017
Interest income	$	3		$	2		$	7		$	6
Other nonoperating income	1			2			2			5
Insurance policy expense	(2		)	(1		)	(1		)	(2		)
Benefits non-service costs	(4		)	(7		)	(9		)	(13		)
Other expense, net	$	(2	)	$	(4	)	$	(1	)	$	(4	)