Retirement Benefits (Schedule Of Defined Benefit Plan Net Periodic Benefit Cost Combined U.S. and Signficant Non-U.S. Plans) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 10	$ 7	$ 18	$ 17
Interest cost	121	117	240	235
Expected return on plan assets	(217)	(218)	(430)	(439)
Amortization of prior service (credit) cost	0	(1)	0	(1)
Recognized actuarial loss	26	37	52	74
Net periodic benefit (credit) cost	(60)	(58)	(120)	(114)
Settlement loss			4	0
Total (credit) cost	(60)	(58)	(116)	(114)
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0	0
Interest cost	0	1	1	2
Expected return on plan assets	0	0	0	0
Amortization of prior service (credit) cost	0	(1)	(1)	(2)
Recognized actuarial loss	0	0	0	0
Net periodic benefit (credit) cost	0	0	0	0
Settlement loss			0	0
Total (credit) cost	0	0	0	0
United States | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Interest cost	60	59	120	118
Expected return on plan assets	(85)	(90)	(171)	(179)
Amortization of prior service (credit) cost	0	0	0	0
Recognized actuarial loss	11	14	22	27
Net periodic benefit (credit) cost	(14)	(17)	(29)	(34)
United States | Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Interest cost	0	1	0	1
Expected return on plan assets	0	0	0	0
Amortization of prior service (credit) cost	0	(1)	0	(1)
Recognized actuarial loss	0	0	0	0
Net periodic benefit (credit) cost	0	0	0	0
Foreign Plan | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	10	7	18	17
Interest cost	61	58	120	117
Expected return on plan assets	(132)	(128)	(259)	(260)
Amortization of prior service (credit) cost	0	(1)	0	(1)
Recognized actuarial loss	15	23	30	47
Net periodic benefit (credit) cost	(46)	(41)	(91)	(80)
Settlement loss			4	0
Total (credit) cost			(87)	(80)
Foreign Plan | Postretirement Benefits
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	0	0	(1)	(1)
Recognized actuarial loss	0	0	0	0
Net periodic benefit (credit) cost	$ 0	$ 0	0	0
Settlement loss			0	0
Total (credit) cost			$ 0	$ 0