Pension and Postretirement Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2021

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)	2021		2020		2021		2020		2021		2020
Net periodic benefit cost (benefit)
Operating expense
Service cost	$	72	$	66	$	42	$	38	$	12	$	11
Non-operating expense
Interest cost	$	90	$	124	$	25	$	31	$	11	$	16
Expected return on plan assets		(264)		(262)		(81)		(77)		(19)		(20)
Amortization of transition asset		—		—		—		1		—		—
Amortization of prior service benefit		(6)		(6)		(1)		(1)		(8)		(8)
Amortization of net actuarial loss		132		123		27		29		14		11
Settlements, curtailments, special termination benefits and other		—		—		—		—		1		1
Total non-operating expense (benefit)		(48)		(21)		(30)		(17)		(1)		—
Total net periodic benefit cost (benefit)	$	24	$	45	$	12	$	21	$	11	$	11