Employee Benefits (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011
Net Periodic Benefit Cost
Net Periodic Pension Benefit Costs	$ 338		$ 263		$ 1,032		$ 887
U.S. [Member]
Net Periodic Benefit Cost
Service cost	113		94		339		281
Interest cost	109		116		327		347
Expected return on plan assets	(158)		(154)		(475)		(460)
Amortization of prior service credits	(2)		(2)		(6)		(6)
Amortization of actuarial losses	117		77		352		232
Settlement losses/gains	65		52		204		196
Net Periodic Pension Benefit Costs	244		183		741		590
International [Member]
Net Periodic Benefit Cost
Service cost	45		44		135		132
Interest cost	79		81		241		243
Expected return on plan assets	(67)		(71)		(201)		(208)
Amortization of prior service credits	5		3		14		15
Amortization of actuarial losses	32		23		102		79
Curtailment losses	0		0		0		36
Net Periodic Pension Benefit Costs	94		80		291		297
Other Benefits [Member]
Net Periodic Benefit Cost
Service cost	16	[1]	14	[1]	46	[1]	44	[1]
Interest cost	37	[1]	46	[1]	114	[1]	136	[1]
Amortization of prior service credits	(18)	[1]	(18)	[1]	(54)	[1]	(54)	[1]
Amortization of actuarial losses	13	[1]	17	[1]	42	[1]	48	[1]
Settlement losses/gains	0	[1]	0	[1]	(26)	[1]	0	[1]
Net Periodic Pension Benefit Costs	$ 48		$ 59		$ 122		$ 174

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