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		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 10	$ 10	$ 27	$ 28
Interest cost	112	120	322	360
Expected return on plan assets	(212)	(214)	(629)	(644)
Amortization of prior service (credit) cost			0	0
Recognized actuarial loss (credit)	40	25	120	77
Net periodic benefit credit	(50)	(59)	(160)	(179)
Settlement loss			0	4
Total (credit) cost	(50)	(59)	(160)	(175)
Pension Benefits | United States
Defined Benefit Plan Disclosure [Line Items]
Interest cost	53	61	160	181
Expected return on plan assets	(86)	(86)	(259)	(257)
Recognized actuarial loss (credit)	18	11	54	33
Net periodic benefit credit	(15)	(14)	(45)	(43)
Pension Benefits | Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	10	10	27	28
Interest cost	59	59	162	179
Expected return on plan assets	(126)	(128)	(370)	(387)
Amortization of prior service (credit) cost			0	0
Recognized actuarial loss (credit)	22	14	66	44
Net periodic benefit credit	(35)	(45)	(115)	(136)
Settlement loss			0	4
Total (credit) cost			(115)	(132)
Post-retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0	0
Interest cost	1	1	2	2
Expected return on plan assets	0	0	0	0
Amortization of prior service (credit) cost			(1)	(1)
Recognized actuarial loss (credit)	(1)	(1)	(1)	(1)
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	1	1	1	1
Expected return on plan assets	0	0	0	0
Recognized actuarial loss (credit)	(1)	(1)	(1)	(1)
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 (credit)	0	0	0	0
Net periodic benefit credit	$ 0	$ 0	0	0
Settlement loss			0	0
Total (credit) cost			$ 0	$ 0