Retirement Benefits (Schedule Of Defined Benefit Plan Net Periodic Benefit Cost) (Details) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Pension Benefits [Member]
Service cost	$ 55	$ 49	$ 169	$ 147
Interest cost	153	145	458	431
Expected return on plan assets	(223)	(204)	(668)	(608)
Amortization of prior service credit	(5)	(5)	(14)	(15)
Recognized actuarial loss	54	36	162	108
Net periodic benefit cost	34	21	107	63
U.S. Pension Benefits [Member]
Service cost	20	19	62	57
Interest cost	58	57	173	170
Expected return on plan assets	(79)	(74)	(236)	(221)
Amortization of prior service credit	(4)	(4)	(12)	(13)
Recognized actuarial loss	25	17	75	53
Net periodic benefit cost	20	15	62	46
Domestic Pension Plans of Foreign Entity, Defined Benefit [Member]
Service cost	35	30	107	90
Interest cost	95	88	285	261
Expected return on plan assets	(144)	(130)	(432)	(387)
Amortization of prior service credit	(1)	(1)	(2)	(2)
Recognized actuarial loss	29	19	87	55
Net periodic benefit cost	14	6	45	17
Postretirement Benefits [Member]
Service cost	1		4	3
Interest cost	2	4	9	11
Expected return on plan assets
Amortization of prior service credit	(3)	(3)	(10)	(10)
Recognized actuarial loss	(3)		(3)
Net periodic benefit cost	(3)	1		4
U.S. Postretirement Benefits [Member]
Service cost			2	2
Interest cost	1	3	6	8
Expected return on plan assets
Amortization of prior service credit	(3)	(3)	(10)	(10)
Recognized actuarial loss	(3)		(3)
Net periodic benefit cost	(5)		(5)
Domestic Postretirement Benefit Plans of Foreign Entity, Defined Benefit [Member]
Service cost	1		2	1
Interest cost	1	1	3	3
Expected return on plan assets
Amortization of prior service credit
Recognized actuarial loss
Net periodic benefit cost	$ 2	$ 1	$ 5	$ 4