Employee Benefits (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Net Periodic Benefit Cost
Net Periodic Benefit Costs	$ 221		$ 342		$ 645		$ 1,038
U.S. [Member]
Net Periodic Benefit Cost
Service cost	113		124		338		371
Interest cost	124		117		371		353
Expected return on plan assets	(197)		(175)		(591)		(525)
Amortization of prior service (credits) costs	(3)		0		(7)		1
Amortization of actuarial losses	52		121		157		364
Settlement losses (gains)	48		57		114		171
Net Periodic Benefit Costs	137		244		382		735
International [Member]
Net Periodic Benefit Cost
Service cost	46		48		143		145
Interest cost	84		77		257		236
Expected return on plan assets	(75)		(68)		(227)		(204)
Amortization of prior service (credits) costs	6		6		16		16
Amortization of actuarial losses	23		35		74		110
Net Periodic Benefit Costs	84		98		263		303
Other Benefits [Member]
Net Periodic Benefit Cost
Service cost	13	[1]	13	[1]	38	[1]	49	[1]
Interest cost	37	[1]	32	[1]	112	[1]	112	[1]
Amortization of prior service (credits) costs	3	[1]	(12)	[1]	10	[1]	(37)	[1]
Amortization of actuarial losses	2	[1]	13	[1]	5	[1]	40	[1]
Net Periodic Benefit Costs	$ 55		$ 46		$ 165		$ 164

[1] Includes costs for U.S. and international OPEB plans. Obligations for plans outside the United States are not significant relative to the company’s total OPEB obligation.