Pension and Postretirement Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2016

Pension and Postretirement Benefit Plans

Components of net periodic benefit cost (benefit)

Benefit Plan Information

	Three months ended September 30,
	Qualified and Non-qualified
	Pension Benefits								Postretirement
	United States				International				Benefits
(Millions)	2016		2015		2016		2015		2016		2015
Net periodic benefit cost (benefit)
Service cost	$	64	$	73	$	35	$	36	$	13	$	19
Interest cost		144		163		45		49		20		25
Expected return on plan assets		(261)		(267)		(78)		(74)		(23)		(23)
Amortization of transition (asset) obligation		—		—		—		—		—		—
Amortization of prior service cost (benefit)		(6)		(6)		(3)		(3)		(13)		(10)
Amortization of net actuarial (gain) loss		89		101		21		34		15		18
Settlements, curtailments, special termination benefits and other		—		—		—		—		—		—
Net periodic benefit cost (benefit) after settlements, curtailments, special termination benefits and other	$	30	$	64	$	20	$	42	$	12	$	29

	Nine months ended September 30,
	Qualified and Non-qualified
	Pension Benefits								Postretirement
	United States				International				Benefits
(Millions)	2016		2015		2016		2015		2016		2015
Net periodic benefit cost (benefit)
Service cost	$	194	$	219	$	102	$	118	$	40	$	62
Interest cost		431		491		131		159		59		75
Expected return on plan assets		(782)		(801)		(234)		(236)		(68)		(68)
Amortization of transition (asset) obligation		—		—		(1)		(1)		—		—
Amortization of prior service cost (benefit)		(18)		(18)		(10)		(10)		(41)		(26)
Amortization of net actuarial (gain) loss		265		305		66		110		46		56
Settlements, curtailments, special termination benefits and other		—		—		—		(17)		—		—
Net periodic benefit cost (benefit) after settlements, curtailments, special termination benefits and other	$	90	$	196	$	54	$	123	$	36	$	99

Discount rates using spot yield curve approach

Using this methodology, the Company determined discount rates for its plans as follows:

	U.S. Qualified Pension		International Pension (weighted average)		U.S. Postretirement Medical
December 31, 2015 Liability:
Benefit obligation	4.47	%	3.12	%	4.32	%
2016 Net Periodic Benefit Cost Components:
Service cost	4.72	%	2.84	%	4.60	%
Interest cost	3.77	%	2.72	%	3.44	%