Retirement Benefits Plans - Benefits Expense (Details 5) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Defined Benefit Plans and Other Postretirement Benefit Plans
Curtailment loss			$ 22
Settlement loss			86
United States pension settlement expense			83
Restricted lump sum payments, percent			100.00%
United States pension benefit expense
Defined Benefit Plans and Other Postretirement Benefit Plans
Service cost	93	80	76
Interest cost	132	131	133
Expected return on plan assets	(164)	(156)	(131)
Amortization	75	53	34
Benefit plans	136	108	112
Curtailment loss	0	1	17
Settlement loss	17	16	83
Total expense	153	125	212
Non-United States pension benefit expense [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans
Service cost	48	39	34
Interest cost	78	69	70
Expected return on plan assets	(70)	(62)	(58)
Amortization	13	8	4
Benefit plans	69	54	50
Curtailment loss	1	0	5
Settlement loss	4	0	3
Total expense	74	54	58
Other postretirement benefits expense [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans
Service cost	15	16	15
Interest cost	41	46	49
Expected return on plan assets	0	0	0
Amortization	12	10	1
Benefit plans	68	72	65
Curtailment loss	0	0	1
Settlement loss	0	0	0
Total expense	$ 68	$ 72	$ 66