Retirement Benefits Plans - Change in Benefit Obligations (Details 1) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
United States pension liabilities [Member]
Change in benefit obligations
Balance at January 1	$ 2,458	$ 2,244
Service cost	93	80
Interest cost	132	131
Actuarial loss	346	133
Gross benefits paid	(131)	(122)
Foreign currency translation	0	0
Other	1	(8)
Balance at December 31	2,899	2,458
Accumulated benefit obligation	2,762	2,366
Non-United States pension liabilities [Member]
Change in benefit obligations
Balance at January 1	1,460	1,366
Service cost	48	39
Interest cost	78	69
Actuarial loss	26	94
Gross benefits paid	(82)	(76)
Foreign currency translation	(23)	(53)
Other	(2)	21
Balance at December 31	1,505	1,460
Accumulated benefit obligation	1,364	1,330
Other postretirement liabilities [Member]
Change in benefit obligations
Balance at January 1	826	830
Service cost	15	16
Interest cost	41	46
Actuarial loss	41	15
Gross benefits paid	(101)	(107)
Foreign currency translation	(1)	1
Other	32	25
Balance at December 31	$ 853	$ 826