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
	Mar. 31, 2019	Mar. 31, 2018
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 8	$ 10
Interest cost	119	118
Expected return on plan assets	(213)	(221)
Amortization of prior service (credit) cost	0	0
Recognized actuarial loss	26	37
Net periodic benefit (credit) cost	(60)	(56)
Settlement loss	4	0
Total (credit) cost	(56)	(56)
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0
Interest cost	1	1
Expected return on plan assets	0	0
Amortization of prior service (credit) cost	(1)	(1)
Recognized actuarial loss	0	0
Net periodic benefit (credit) cost	0	0
Settlement loss	0	0
Total (credit) cost	0	0
United States | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Interest cost	60	59
Expected return on plan assets	(86)	(89)
Recognized actuarial loss	11	13
Net periodic benefit (credit) cost	(15)	(17)
United States | Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Interest cost	0	0
Expected return on plan assets	0	0
Recognized actuarial loss	0	0
Net periodic benefit (credit) cost	0	0
Foreign Plan | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	8	10
Interest cost	59	59
Expected return on plan assets	(127)	(132)
Amortization of prior service (credit) cost	0	0
Recognized actuarial loss	15	24
Net periodic benefit (credit) cost	(45)	(39)
Settlement loss	4	0
Total (credit) cost	(41)	(39)
Foreign Plan | Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0
Interest cost	1	1
Expected return on plan assets	0	0
Amortization of prior service (credit) cost	(1)	(1)
Recognized actuarial loss	0	0
Net periodic benefit (credit) cost	0	0
Settlement loss	0	0
Total (credit) cost	$ 0	$ 0