Retirement Benefits Plans (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
United States pension benefit expense [Member]
Retirement benefits plans expense
Service cost	$ 29	$ 32
Interest cost	40	37
Expected return on plan assets	(61)	(57)
Amortization	23	33
Total	31	45
Settlement loss	34	6
Total expense	65	51
Non-United States pension benefit expense [Member]
Retirement benefits plans expense
Service cost	16	15
Interest cost	22	20
Expected return on plan assets	(25)	(21)
Amortization	7	7
Total	20	21
Settlement loss	0	0
Total expense	20	21
Other postretirement benefits expense [Member]
Retirement benefits plans expense
Service cost	4	5
Interest cost	9	9
Expected return on plan assets	(1)	(2)
Amortization	2	3
Total	14	15
Settlement loss	0	0
Total expense	$ 14	$ 15