Employee Benefits (Schedule Of Net Benefit Costs, Other Changes in Plan Assets and Benefit Obligation Recognized In Other Comprehensive Income) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Amortization of net gain (loss)	$ 0	$ (2)	$ (1)
Expected net loss, Next Fiscal Year	0
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Remeasurement due to Settlement	26
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected net loss, Next Fiscal Year	0
Domestic Plan [Member] | Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1	0
Interest cost	2	2	1
Net amortization	0	0	0
Net periodic benefit cost (gain)	3	3	1
Net loss (gain) emerging	(1)	(1)	(6)
Total recognized in OCI	(1)	(1)	(6)
Total net periodic benefit cost and OCI	2	2	(5)
Domestic Plan [Member] | Defined Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	3	3	1
Administrative expenses	3	2	3
Interest cost	24	25	9
Expected return on plan assets	(42)	(40)	(15)
Net amortization	(1)	1	1
Settlement benefits	(14)	0	0
Net periodic benefit cost (gain)	(27)	(9)	(1)
Net loss (gain) emerging	20	(18)	(67)
Settlement gain	14	0	0
Amortization of net gain (loss)	1	(1)	(1)
Total recognized in OCI	35	(19)	(68)
Total net periodic benefit cost and OCI	8	(28)	(69)
Foreign Plan [Member] | Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0
Interest cost	0	0	0
Net amortization	0	0	0
Net periodic benefit cost (gain)	0	0	0
Net loss (gain) emerging	(1)	0	0
Total recognized in OCI	(1)	0	0
Total net periodic benefit cost and OCI	(1)	0	0
Foreign Plan [Member] | Defined Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	2	2	2
Administrative expenses	0	0	0
Interest cost	3	2	2
Expected return on plan assets	(1)	(1)	0
Net amortization	1	1	0
Settlement benefits	0	0	0
Net periodic benefit cost (gain)	5	4	4
Net loss (gain) emerging	1	0	13
Settlement gain	0	0	0
Amortization of net gain (loss)	(1)	(1)	0
Total recognized in OCI	0	(1)	13
Total net periodic benefit cost and OCI	$ 5	$ 3	$ 17