Retirement Benefits Plans (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
United States pension benefit expense [Member]
Retirement benefits plans expense
Service cost	$ 29	$ 32	$ 58	$ 64
Interest cost	41	37	81	74
Expected return on plan assets	(62)	(56)	(123)	(113)
Amortization	23	33	46	66
Total	31	46	62	91
Settlement loss	14	10	48	16
Total expense	45	56	110	107
Non-United States pension benefit expense [Member]
Retirement benefits plans expense
Service cost	17	15	33	30
Interest cost	22	19	44	39
Expected return on plan assets	(25)	(21)	(50)	(42)
Amortization	7	7	14	14
Total	21	20	41	41
Settlement loss	0	0	0	0
Total expense	21	20	41	41
Other postretirement benefits expense [Member]
Retirement benefits plans expense
Service cost	5	5	9	10
Interest cost	10	8	19	17
Expected return on plan assets	(2)	(1)	(3)	(3)
Amortization	2	4	4	7
Total	15	16	29	31
Settlement loss	0	0	0	0
Total expense	$ 15	$ 16	$ 29	$ 31