Retirement Benefit Plans (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
United States pension benefit expense [Member]
Retirement benefit plans expense
Service cost	$ 29	$ 23
Interest cost	34	33
Expected return on plan assets	(45)	(41)
Amortization	29	19
Total benefit plans	47	34
Settlement loss	4	3
Total expense	51	37
Non-United States pension benefit expense [Member]
Retirement benefit plans expense
Service cost	12	13
Interest cost	19	20
Expected return on plan assets	(19)	(18)
Amortization	4	3
Total benefit plans	16	18
Settlement loss	2	0
Total expense	18	18
Other postretirement benefit expense [Member]
Retirement benefit plans expense
Service cost	4	4
Interest cost	9	10
Expected return on plan assets	(1)	0
Amortization	4	3
Total benefit plans	16	17
Settlement loss	0	0
Total expense	$ 16	$ 17