Pensions and Other Postretirement Benefits Schedule of Net Benefit Costs (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Change in Assumptions for Pension Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Reduction in Interest and Service Cost	$ 194		$ 385
US Pension Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Service cost including administrative expenses	96	$ 102	191	$ 203
Interest cost	553	688	1,106	1,377
Expected return on plan assets	(944)	(974)	(1,889)	(1,948)
Amortization of prior service cost (credit)	(1)	(1)	(2)	(2)
Amortization of net actuarial (gains) losses	(7)	2	(13)	4
Curtailments, settlements and other	0	0	0	0
Net periodic pension and OPEB (income) expense	(303)	(183)	(607)	(366)
U.S. Hourly Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Discretionary employer contributions			2,000
Non-US Pension Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Service cost	89	95	174	195
Interest cost	140	195	284	391
Expected return on plan assets	(179)	(202)	(361)	(405)
Amortization of prior service cost (credit)	3	4	6	8
Amortization of net actuarial (gains) losses	48	59	95	117
Curtailments, settlements and other	0	107	0	107
Net periodic pension and OPEB (income) expense	101	258	198	413
Global OPEB Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Service cost	4	6	9	12
Interest cost	50	59	100	119
Expected return on plan assets	0	0	0	0
Amortization of prior service cost (credit)	(3)	(3)	(7)	(6)
Amortization of net actuarial (gains) losses	5	9	10	17
Curtailments, settlements and other	0	0	0	0
Net periodic pension and OPEB (income) expense	$ 56	$ 71	$ 112	$ 142