Retirement Benefit Plans (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
United States pension benefit expense [Member]
Retirement benefit plans expense
Service cost	$ 28	$ 23	$ 86	$ 69
Interest cost	33	33	100	99
Expected return on plan assets	(46)	(41)	(136)	(123)
Amortization	30	19	88	57
Total benefit plans	45	34	138	102
Curtailment loss	0	0	0	0
Settlement loss	8	5	17	12
Total expense	53	39	155	114
Non-United States pension benefit expense [Member]
Retirement benefit plans expense
Service cost	13	12	37	37
Interest cost	18	19	56	59
Expected return on plan assets	(18)	(17)	(56)	(53)
Amortization	3	3	11	9
Total benefit plans	16	17	48	52
Curtailment loss	0	1	0	1
Settlement loss	0	0	2	3
Total expense	16	18	50	56
Other postretirement benefit expense [Member]
Retirement benefit plans expense
Service cost	5	4	13	12
Interest cost	10	10	29	30
Expected return on plan assets	(2)	0	(5)	0
Amortization	3	3	10	9
Total benefit plans	16	17	47	51
Curtailment loss	0	0	0	0
Settlement loss	0	0	0	0
Total expense	$ 16	$ 17	$ 47	$ 51