Pension and Postretirement Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2018

Pension and Postretirement Benefit Plans

Components of net periodic benefit cost (benefit)

	Three months ended September 30,
	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	$	37	$	33	$	13	$	13
Non-operating expense
Interest cost	$	141	$	141	$	40	$	38	$	20	$	20
Expected return on plan assets		(272)		(259)		(78)		(71)		(21)		(21)
Amortization of prior service benefit		(6)		(5)		(4)		(3)		(10)		(13)
Amortization of net actuarial loss		126		97		29		29		15		14
Total non-operating expense (benefit)		(11)		(26)		(13)		(7)		4		—
Total net periodic benefit cost (benefit)	$	61	$	41	$	24	$	26	$	17	$	13

	Nine months ended September 30,
	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	$	216	$	201	$	110	$	100	$	39	$	38
Non-operating expense
Interest cost	$	423	$	425	$	120	$	112	$	60	$	59
Expected return on plan assets		(816)		(777)		(235)		(209)		(63)		(63)
Amortization of prior service benefit		(18)		(17)		(10)		(9)		(30)		(39)
Amortization of net actuarial loss		378		291		87		89		45		42
Total non-operating expense (benefit)		(33)		(78)		(38)		(17)		12		(1)
Total net periodic benefit cost (benefit)	$	183	$	123	$	72	$	83	$	51	$	37