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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 10	$ 8	$ 28	$ 25
Interest cost	120	114	360	349
Expected return on plan assets	(214)	(213)	(644)	(652)
Amortization of prior service credit	0	0	0	(1)
Recognized actuarial loss	25	36	77	110
Net periodic benefit (credit) cost	(59)	(55)	(179)	(169)
Settlement loss			4	0
Total (credit) cost	(59)	(55)	(175)	(169)
Post-retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	1	0	1
Interest cost	1	0	2	2
Expected return on plan assets	0	0	0	0
Amortization of prior service credit	0	(1)	(1)	(3)
Recognized actuarial loss	(1)	1	(1)	1
Net periodic benefit (credit) cost	0	1	0	1
Settlement loss			0	0
Total (credit) cost	0	1	0	1
United States | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Interest cost	61	58	181	176
Expected return on plan assets	(86)	(89)	(257)	(268)
Amortization of prior service credit			0	0
Recognized actuarial loss	11	14	33	41
Net periodic benefit (credit) cost	(14)	(17)	(43)	(51)
United States | Post-retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Interest cost	1	0	1	1
Expected return on plan assets	0	0	0	0
Amortization of prior service credit			0	(1)
Recognized actuarial loss	(1)	0	(1)	0
Net periodic benefit (credit) cost	0	0	0	0
Foreign Plan | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	10	8	28	25
Interest cost	59	56	179	173
Expected return on plan assets	(128)	(124)	(387)	(384)
Amortization of prior service credit	0	0	0	(1)
Recognized actuarial loss	14	22	44	69
Net periodic benefit (credit) cost	(45)	(38)	(136)	(118)
Settlement loss			4	0
Total (credit) cost			(132)	(118)
Foreign Plan | Post-retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	1	0	1
Interest cost	0	0	1	1
Expected return on plan assets	0	0	0	0
Amortization of prior service credit	0	(1)	(1)	(2)
Recognized actuarial loss	0	1	0	1
Net periodic benefit (credit) cost	$ 0	$ 1	0	1
Settlement loss			0	0
Total (credit) cost			$ 0	$ 1