Retirement Benefits (Schedule Of Defined Benefit Plan Net Periodic Benefit Cost) (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2015	Mar. 31, 2015	Sep. 30, 2014	Mar. 31, 2014	Sep. 30, 2015	Sep. 30, 2014
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 48		$ 49		$ 150	$ 172
Interest cost	147		163		439	485
Expected return on plan assets	(246)		(251)		(732)	(749)
Amortization of prior service cost (credit)	0		(2)		0	(8)
Recognized actuarial loss (gain)	66		55		220	159
Net periodic benefit cost	15		14		77	59
Curtailment cost (credit)	4		0		4	(65)
Settlement loss	2		0		2	0
Plan termination					0	0
Total cost (credit)	21		14		83	(6)
U.S. Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	29		23		88	68
Interest cost	63		65		188	190
Expected return on plan assets	(93)		(87)		(277)	(260)
Amortization of prior service cost (credit)	0		(1)		0	(5)
Recognized actuarial loss (gain)	35		31		126	84
Net periodic benefit cost	34		31		125	77
Plan termination					0	0
Total cost (credit)					125	77
Non-U.S. Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	19		26		62	104
Interest cost	84		98		251	295
Expected return on plan assets	(153)		(164)		(455)	(489)
Amortization of prior service cost (credit)	0		(1)		0	(3)
Recognized actuarial loss (gain)	31		24		94	75
Net periodic benefit cost	(19)		(17)		(48)	(18)
Curtailment cost (credit)	4		0	$ (65)	4	(65)
Settlement loss	2		0		2	0
Total cost (credit)	(13)		(17)		(42)	(83)
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0		2		2	4
Interest cost	1		3		5	9
Expected return on plan assets	0		0		0	0
Amortization of prior service cost (credit)	0		0		1	0
Recognized actuarial loss (gain)	0		(1)		(1)	(1)
Net periodic benefit cost	1		4		7	12
Curtailment cost (credit)	0		0		0	0
Settlement loss	0		0		0	0
Plan termination					(128)	0
Total cost (credit)	1	$ (125)	4		(121)	12
U.S. Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0		1		1	2
Interest cost	0		2		2	6
Expected return on plan assets	0		0		0	0
Amortization of prior service cost (credit)	0		0		1	0
Recognized actuarial loss (gain)	0		(1)		(1)	(2)
Net periodic benefit cost	0		2		3	6
Plan termination					(128)	0
Total cost (credit)					(125)	6
Foreign Postretirement Benefit Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0		1		1	2
Interest cost	1		1		3	3
Expected return on plan assets	0		0		0	0
Amortization of prior service cost (credit)	0		0		0	0
Recognized actuarial loss (gain)	0		0		0	1
Net periodic benefit cost	1		2		4	6
Curtailment cost (credit)	0		0		0	0
Settlement loss	0		0		0	0
Total cost (credit)	$ 1		$ 2		$ 4	$ 6