Retirement Benefits (Schedule Of Defined Benefit Plan Net Periodic Benefit Cost) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 44	$ 52
Interest cost	137	146
Expected return on plan assets	(241)	(243)
Amortization of prior service cost (credit)	0	0
Recognized actuarial loss (gain)	42	76
Net periodic benefit cost	(18)	31
Plan termination	0	0
Total cost (credit)	(18)	31
U.S. Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	26	30
Interest cost	66	62
Expected return on plan assets	(95)	(92)
Amortization of prior service cost (credit)	0	0
Recognized actuarial loss (gain)	18	45
Net periodic benefit cost	15	45
Plan termination	0	0
Total cost (credit)	15	45
Non-U.S. Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	18	22
Interest cost	71	84
Expected return on plan assets	(146)	(151)
Recognized actuarial loss (gain)	24	31
Net periodic benefit cost	(33)	(14)
Total cost (credit)	(33)	(14)
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	1
Interest cost	2	2
Expected return on plan assets	0	0
Amortization of prior service cost (credit)	1	0
Recognized actuarial loss (gain)	(1)	0
Net periodic benefit cost	2	3
Plan termination	0	(128)
Total cost (credit)	2	(125)
U.S. Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	1
Interest cost	1	1
Expected return on plan assets	0	0
Amortization of prior service cost (credit)	1	0
Recognized actuarial loss (gain)	(1)	0
Net periodic benefit cost	1	2
Plan termination	0	(128)
Total cost (credit)	1	(126)
Foreign Postretirement Benefit Plan, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0
Interest cost	1	1
Expected return on plan assets	0	0
Recognized actuarial loss (gain)	0	0
Net periodic benefit cost	1	1
Total cost (credit)	$ 1	$ 1