Retirement Benefits (Schedule Of Defined Benefit Plan Net Periodic Benefit Cost Combined U.S. and Significant Non-U.S. Plans) (Details) - Pension Benefits - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 9	$ 10	$ 29	$ 27
Interest cost	87	112	258	322
Expected return on plan assets	(208)	(212)	(627)	(629)
Recognized actuarial loss	52	40	155	120
Net periodic benefit (credit) cost			(185)	(160)
Settlement loss			2	0
Total credit	(60)	(50)	(183)	(160)
United States
Defined Benefit Plan Disclosure [Line Items]
Interest cost	47	53	139	160
Expected return on plan assets	(82)	(86)	(245)	(259)
Recognized actuarial loss	22	18	67	54
Net periodic benefit (credit) cost	(13)	(15)	(39)	(45)
Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	9	10	29	27
Interest cost	40	59	119	162
Expected return on plan assets	(126)	(126)	(382)	(370)
Recognized actuarial loss	30	22	88	66
Net periodic benefit (credit) cost			(146)	(115)
Settlement loss			2	0
Total credit	$ (47)	$ (35)	$ (144)	$ (115)