Retirement Benefits (Schedule Of Defined Benefit Plan Net Periodic Benefit Cost) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Pension Benefits [Member]
Service cost	$ 61	$ 56
Interest cost	148	152
Expected return on plan assets	(226)	(221)
Amortization of prior service credit	(5)	(5)
Recognized actuarial loss	66	55
Net periodic benefit cost	44	37
U.S. Pension Benefits [Member]
Service cost	24	21
Interest cost	57	58
Expected return on plan assets	(81)	(79)
Amortization of prior service credit	(4)	(4)
Recognized actuarial loss	37	26
Net periodic benefit cost	33	22
Non-U.S. Pension Benefits [Member]
Service cost	37	35
Interest cost	91	94
Expected return on plan assets	(145)	(142)
Amortization of prior service credit	(1)	(1)
Recognized actuarial loss	29	29
Net periodic benefit cost	11	15
Postretirement Benefits [Member]
Service cost	2	2
Interest cost	3	3
Expected return on plan assets
Amortization of prior service credit	(3)	(3)
Recognized actuarial loss
Net periodic benefit cost	2	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)	(3)
Recognized actuarial loss
Net periodic benefit cost
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