Employee Benefits (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Net Periodic Benefit Cost
Net Periodic Benefit Costs	$ 217		$ 353		$ 424		$ 696
U.S. [Member]
Net Periodic Benefit Cost
Service cost	112		123		225		247
Interest cost	123		118		247		236
Expected return on plan assets	(197)		(175)		(394)		(350)
Amortization of prior service costs (credits)	(2)		1		(4)		1
Amortization of actuarial losses	53		122		105		243
Settlement losses (gains)	33		57		66		114
Net Periodic Benefit Costs	122		246		245		491
International [Member]
Net Periodic Benefit Cost
Service cost	50		49		97		97
Interest cost	89		82		173		159
Expected return on plan assets	(76)		(68)		(152)		(136)
Amortization of prior service costs (credits)	5		5		10		10
Amortization of actuarial losses	27		39		51		75
Net Periodic Benefit Costs	95		107		179		205
Other Benefits [Member]
Net Periodic Benefit Cost
Service cost	12	[1]	18	[1]	25	[1]	36	[1]
Interest cost	38	[1]	40	[1]	75	[1]	80	[1]
Amortization of prior service costs (credits)	4	[1]	(13)	[1]	7	[1]	(25)	[1]
Amortization of actuarial losses	1	[1]	14	[1]	3	[1]	27	[1]
Net Periodic Benefit Costs	$ 55		$ 59		$ 110		$ 118

[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.