Employee Benefits (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Net Periodic Benefit Cost
Net Periodic Benefit Costs	$ 207		$ 343
U.S. [Member]
Net Periodic Benefit Cost
Service cost	113		124
Interest cost	124		118
Expected return on plan assets	(197)		(175)
Amortization of prior service costs (credits)	(2)		0
Amortization of actuarial losses	52		121
Settlement losses (gains)	33		57
Net Periodic Benefit Costs	123		245
International [Member]
Net Periodic Benefit Cost
Service cost	47		48
Interest cost	84		77
Expected return on plan assets	(76)		(68)
Amortization of prior service costs (credits)	5		5
Amortization of actuarial losses	24		36
Net Periodic Benefit Costs	84		98
Other Benefits [Member]
Net Periodic Benefit Cost
Service cost	13	[1]	18	[1]
Interest cost	37	[1]	40	[1]
Amortization of prior service costs (credits)	3	[1]	(12)	[1]
Amortization of actuarial losses	2	[1]	13	[1]
Net Periodic Benefit Costs	$ 55		$ 59

[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.