Retirement Benefits (Schedule Of Defined Benefit Plan Net Periodic Benefit Cost) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2010	Sep. 30, 2012	Sep. 30, 2011
Pension Benefits [Member]
Service cost	$ 59	$ 55	$ 180	$ 169
Interest cost	148	153	445	458
Expected return on plan assets	(225)	(223)	(676)	(668)
Amortization of prior service credit	(4)	(5)	(14)	(14)
Recognized actuarial loss	67	54	201	162
Net periodic benefit cost	45	34	136	107
U.S. Pension Benefits [Member]
Service cost	23	20	70	62
Interest cost	57	58	172	173
Expected return on plan assets	(80)	(79)	(241)	(236)
Amortization of prior service credit	(4)	(4)	(12)	(12)
Recognized actuarial loss	38	25	114	75
Net periodic benefit cost	34	20	103	62
Non-U.S. Pension Benefits [Member]
Service cost	36	35	110	107
Interest cost	91	95	273	285
Expected return on plan assets	(145)	(144)	(435)	(432)
Amortization of prior service credit	0	(1)	(2)	(2)
Recognized actuarial loss	29	29	87	87
Net periodic benefit cost	11	14	33	45
Postretirement Benefits [Member]
Service cost	1	1	3	4
Interest cost	3	2	9	9
Expected return on plan assets
Amortization of prior service credit	(3)	(3)	(9)	(10)
Recognized actuarial loss		(3)		(3)
Net periodic benefit cost	1	(3)	3
U.S. Postretirement Benefits [Member]
Service cost	1		2	2
Interest cost	2	1	6	6
Expected return on plan assets
Amortization of prior service credit	(3)	(3)	(9)	(10)
Recognized actuarial loss		(3)	(1)	(3)
Net periodic benefit cost		(5)	(2)	(5)
Non-U.S.Postretirement Benefits [Member]
Service cost		1	1	2
Interest cost	1	1	3	3
Expected return on plan assets
Amortization of prior service credit
Recognized actuarial loss			1
Net periodic benefit cost	$ 1	$ 2	$ 5	$ 5