NOTE 6. Supplemental Income Statement Information

Other expense (income), net consists of the following:


	Three months ended				Six months ended
	June 30,				June 30,
(Millions)	2018		2017		2018		2017
Interest expense	$	88	$	54	$	170	$	99
Interest income		(16)		(12)		(37)		(20)
Pension and postretirement net periodic benefit cost (benefit)		(21)		(31)		(40)		(63)
Total	$	51	$	11	$	93	$	16

Pension and postretirement net periodic benefit costs described in the table above include all components of defined benefit plan net periodic benefit costs except service cost, which is reported in various operating expense lines. Refer to Note 11 for additional details on the components of pension and postretirement net periodic benefit costs.