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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 10	$ 9	$ 20	$ 17
Interest cost	86	104	171	210
Expected return on plan assets	(211)	(207)	(419)	(417)
Amortization of prior service (credit) cost			0	0
Recognized actuarial loss	51	40	103	80
Net periodic benefit (credit) cost	(64)	(54)	(125)	(110)
Settlement loss	2	0	2	0
Total (credit) cost	(62)	(54)	(123)	(110)
Pension Benefits | United States
Defined Benefit Plan Disclosure [Line Items]
Interest cost	46	54	92	107
Expected return on plan assets	(81)	(87)	(163)	(173)
Recognized actuarial loss	22	18	45	36
Net periodic benefit (credit) cost	(13)	(15)	(26)	(30)
Pension Benefits | Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	10	9	20	17
Interest cost	40	50	79	103
Expected return on plan assets	(130)	(120)	(256)	(244)
Amortization of prior service (credit) cost			0	0
Recognized actuarial loss	29	22	58	44
Net periodic benefit (credit) cost	(51)	(39)	(99)	(80)
Settlement loss	2	0	2	0
Total (credit) cost	(49)	(39)	(97)	(80)
Post-retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0	0
Interest cost	1	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	1	0
Net periodic benefit (credit) cost	1	0	1	0
Settlement loss	0	0	0	0
Total (credit) cost	1	0	1	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) cost	0	0	0	0
Post-retirement Benefits | Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0	0
Interest cost	1	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	1	0
Net periodic benefit (credit) cost	1	0	1	0
Settlement loss	0	0	0	0
Total (credit) cost	$ 1	$ 0	$ 1	$ 0