Retirement Benefits (Schedule Of Defined Benefit Plan Net Periodic Benefit Cost) (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Mar. 31, 2015	Sep. 30, 2016	Sep. 30, 2015
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 43	$ 48		$ 133	$ 150
Interest cost	132	147		407	439
Expected return on plan assets	(232)	(246)		(715)	(732)
Amortization of prior service cost	1	0		0	0
Recognized actuarial loss (gain)	43	66		127	220
Net periodic benefit (credit) cost	(13)	15		(48)	77
Curtailment (gain) loss	0	4		(5)	4
Settlement loss	0	2		1	2
Plan termination				0	0
Total (credit) cost	(13)	21		(52)	83
U.S. Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	26	29		79	88
Interest cost	66	63		198	188
Expected return on plan assets	(95)	(93)		(285)	(277)
Amortization of prior service cost	0	0		0	0
Recognized actuarial loss (gain)	19	35		55	126
Net periodic benefit (credit) cost	16	34		47	125
Plan termination				0	0
Total (credit) cost				47	125
Non-U.S. Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	17	19		54	62
Interest cost	66	84		209	251
Expected return on plan assets	(137)	(153)		(430)	(455)
Amortization of prior service cost	1	0
Recognized actuarial loss (gain)	24	31		72	94
Net periodic benefit (credit) cost	(29)	(19)		(95)	(48)
Curtailment (gain) loss	0	4		(5)	4
Settlement loss	0	2		1	2
Total (credit) cost	(29)	(13)		(99)	(42)
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	0		1	2
Interest cost	0	1		3	5
Expected return on plan assets	0	0		0	0
Amortization of prior service cost	1	0		3	1
Recognized actuarial loss (gain)	0	0		(1)	(1)
Net periodic benefit (credit) cost	2	1		6	7
Curtailment (gain) loss	0	0		0	0
Settlement loss	0	0		0	0
Plan termination				0	(128)
Total (credit) cost	2	1	$ (125)	6	(121)
U.S. Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0		0	1
Interest cost	0	0		1	2
Expected return on plan assets	0	0		0	0
Amortization of prior service cost	1	0		3	1
Recognized actuarial loss (gain)	0	0		(1)	(1)
Net periodic benefit (credit) cost	1	0		3	3
Plan termination				0	(128)
Total (credit) cost				3	(125)
Foreign Postretirement Benefit Plan, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	0		1	1
Interest cost	0	1		2	3
Expected return on plan assets	0	0		0	0
Amortization of prior service cost	0	0
Recognized actuarial loss (gain)	0	0		0	0
Net periodic benefit (credit) cost	1	1		3	4
Curtailment (gain) loss	0	0		0	0
Settlement loss	0	0		0	0
Total (credit) cost	$ 1	$ 1		$ 3	$ 4