Retirement Benefits (Schedule Of Defined Benefit Plan Net Periodic Benefit Cost Combined U.S. and Significant Non-U.S. Plans) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 9	$ 10	$ 17	$ 18
Interest cost	104	121	210	240
Expected return on plan assets	(207)	(217)	(417)	(430)
Amortization of prior service (credit) cost			0	0
Recognized actuarial loss	40	26	80	52
Net periodic benefit credit	(54)	(60)	(110)	(120)
Settlement loss			0	4
Total (credit) cost	(54)	(60)	(110)	(116)
Pension Benefits | United States
Defined Benefit Plan Disclosure [Line Items]
Interest cost	54	60	107	120
Expected return on plan assets	(87)	(85)	(173)	(171)
Recognized actuarial loss	18	11	36	22
Net periodic benefit credit	(15)	(14)	(30)	(29)
Pension Benefits | Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	9	10	17	18
Interest cost	50	61	103	120
Expected return on plan assets	(120)	(132)	(244)	(259)
Amortization of prior service (credit) cost			0	0
Recognized actuarial loss	22	15	44	30
Net periodic benefit credit	(39)	(46)	(80)	(91)
Settlement loss			0	4
Total (credit) cost			(80)	(87)
Post-retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0	0
Interest cost	0	0	1	1
Expected return on plan assets	0	0	0	0
Amortization of prior service (credit) cost			(1)	(1)
Recognized actuarial loss	0	0	0	0
Net periodic benefit credit	0	0	0	0
Settlement loss			0	0
Total (credit) cost	0	0	0	0
Post-retirement Benefits | United States
Defined Benefit Plan Disclosure [Line Items]
Interest cost	0	0	0	0
Expected return on plan assets	0	0	0	0
Recognized actuarial loss	0	0	0	0
Net periodic benefit credit	0	0	0	0
Post-retirement Benefits | Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0	0
Interest cost	0	0	1	1
Expected return on plan assets	0	0	0	0
Amortization of prior service (credit) cost			(1)	(1)
Recognized actuarial loss	0	0	0	0
Net periodic benefit credit	$ 0	$ 0	0	0
Settlement loss			0	0
Total (credit) cost			$ 0	$ 0