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
	Mar. 31, 2020	Mar. 31, 2019
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 8	$ 8
Interest cost	106	119
Expected return on plan assets	(210)	(213)
Amortization of prior service (credit) cost	0	0
Recognized actuarial loss	40	26
Net periodic benefit (credit) cost	(56)	(60)
Settlement loss	0	4
Total (credit) cost	(56)	(56)
Pension Benefits | United States
Defined Benefit Plan Disclosure [Line Items]
Interest cost	53	60
Expected return on plan assets	(86)	(86)
Recognized actuarial loss	18	11
Net periodic benefit (credit) cost	(15)	(15)
Pension Benefits | Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	8	8
Interest cost	53	59
Expected return on plan assets	(124)	(127)
Amortization of prior service (credit) cost	0	0
Recognized actuarial loss	22	15
Net periodic benefit (credit) cost	(41)	(45)
Settlement loss	0	4
Total (credit) cost	(41)	(41)
Post-retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0
Interest cost	1	1
Expected return on plan assets	0	0
Amortization of prior service (credit) cost	(1)	(1)
Recognized actuarial loss	0	0
Net periodic benefit (credit) cost	0	0
Settlement loss	0	0
Total (credit) cost	0	0
Post-retirement Benefits | United States
Defined Benefit Plan Disclosure [Line Items]
Interest cost	0	0
Expected return on plan assets	0	0
Recognized actuarial loss	0	0
Net periodic benefit (credit) cost	0	0
Post-retirement Benefits | Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0
Interest cost	1	1
Expected return on plan assets	0	0
Amortization of prior service (credit) cost	(1)	(1)
Recognized actuarial loss	0	0
Net periodic benefit (credit) cost	0	0
Settlement loss	0	0
Total (credit) cost	$ 0	$ 0