Pension and Postretirement Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2018

Pension and Postretirement Benefit Plans

Components of net periodic benefit cost (benefit)

	Three months ended March 31,
	Qualified and Non-qualified
	Pension Benefits								Postretirement
	United States				International				Benefits
(Millions)	2018		2017		2018		2017		2018		2017
Net periodic benefit cost (benefit)
Operating expense
Service cost	$	72	$	67	$	36	$	33	$	13	$	13
Non-operating expense
Interest cost	$	141	$	142	$	40	$	37	$	20	$	19
Expected return on plan assets		(272)		(259)		(78)		(69)		(21)		(21)
Amortization of prior service benefit		(6)		(6)		(3)		(3)		(10)		(13)
Amortization of net actuarial loss		126		97		29		30		15		14
Total non-operating expense (benefit)		(11)		(26)		(12)		(5)		4		(1)
Total net periodic benefit cost (benefit)	$	61	$	41	$	24	$	28	$	17	$	12