Pension and Postretirement Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2016

Pension and Postretirement Benefit Plans

Components of net periodic benefit cost (benefit)

Benefit Plan Information

	Three months ended June 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	$	65	$	73	$	34	$	40	$	14	$	22
Interest cost		144		164		43		55		19		25
Expected return on plan assets		(261)		(267)		(78)		(81)		(22)		(23)
Amortization of transition (asset) obligation		—		—		(1)		(1)		—		—
Amortization of prior service cost (benefit)		(6)		(6)		(4)		(3)		(14)		(8)
Amortization of net actuarial (gain) loss		88		102		23		38		15		19
Settlements, curtailments, special termination benefits and other		—		—		—		—		—		—
Net periodic benefit cost (benefit) after settlements, curtailments, special termination benefits and other	$	30	$	66	$	17	$	48	$	12	$	35

	Six months ended June 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	$	130	$	146	$	67	$	82	$	27	$	43
Interest cost		287		328		86		110		39		50
Expected return on plan assets		(521)		(534)		(156)		(162)		(45)		(45)
Amortization of transition (asset) obligation		—		—		(1)		(1)		—		—
Amortization of prior service cost (benefit)		(12)		(12)		(7)		(7)		(28)		(16)
Amortization of net actuarial (gain) loss		176		204		45		76		31		38
Settlements, curtailments, special termination benefits and other		—		—		—		(17)		—		—
Net periodic benefit cost (benefit) after settlements, curtailments, special termination benefits and other	$	60	$	132	$	34	$	81	$	24	$	70

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	%