Retirement Benefits (Schedule Of Defined Benefit Plan Net Periodic Benefit Cost) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Pension Benefits [Member]
Service cost	$ 64	$ 61
Interest cost	145	148
Expected return on plan assets	(228)	(226)
Amortization of prior service credit	(5)	(5)
Recognized actuarial loss	78	66
Net periodic benefit cost	54	44
U.S. Pension Benefits [Member]
Service cost	27	24
Interest cost	57	57
Expected return on plan assets	(81)	(81)
Amortization of prior service credit	(4)	(4)
Recognized actuarial loss	51	37
Net periodic benefit cost	50	33
Non-U.S. Pension Benefits [Member]
Service cost	37	37
Interest cost	88	91
Expected return on plan assets	(147)	(145)
Amortization of prior service credit	(1)	(1)
Recognized actuarial loss	27	29
Net periodic benefit cost	4	11
Postretirement Benefits [Member]
Service cost	2	2
Interest cost	3	3
Expected return on plan assets
Amortization of prior service credit		(3)
Recognized actuarial loss
Net periodic benefit cost	5	2
U.S. Postretirement Benefits [Member]
Service cost	1	1
Interest cost	2	2
Expected return on plan assets
Amortization of prior service credit		(3)
Recognized actuarial loss
Net periodic benefit cost	3
Non-U.S.Postretirement Benefits [Member]
Service cost	1	1
Interest cost	1	1
Expected return on plan assets
Amortization of prior service credit
Recognized actuarial loss
Net periodic benefit cost	$ 2	$ 2