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, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Settlement benefits		$ (25)
Amortization of net gain (loss)	$ 0	0	$ (2)
Expected net loss, Next Fiscal Year	0
Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year	1
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected net loss, Next Fiscal Year	0
Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year	0
United States [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	3	3	3
Administrative expenses	4	3	2
Interest Cost	23	24	25
Expected return on plan assets	(33)	(42)	(40)
Net amortization	0	(1)	1
Settlement benefits	0	(14)	0
Net periodic benefit cost (gain)	(3)	(27)	(9)
Net loss (gain) emerging	20	20	(18)
Settlement gain	0	14	0
Other Comprehensive Income (Loss), Defined Benefit Plan, Effect on plan change, before tax	0	0	0
Amortization of net gain (loss)	0	1	(1)
Total recognized in OCI	20	35	(19)
Total net periodic benefit cost and OCI	17	8	(28)
United States [Member] | Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1	1
Interest Cost	2	2	2
Net amortization	0	0	0
Net periodic benefit cost (gain)	3	3	3
Net loss (gain) emerging	3	(1)	(1)
Total recognized in OCI	3	(1)	(1)
Total net periodic benefit cost and OCI	6	2	2
Foreign Plan [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	2	2	2
Administrative expenses	0	0	0
Interest Cost	3	3	2
Expected return on plan assets	(1)	(1)	(1)
Net amortization	0	1	1
Settlement benefits	0	0	0
Net periodic benefit cost (gain)	4	5	4
Net loss (gain) emerging	13	1	0
Settlement gain	0	0	0
Other Comprehensive Income (Loss), Defined Benefit Plan, Effect on plan change, before tax	(4)	0	0
Amortization of net gain (loss)	0	(1)	(1)
Total recognized in OCI	9	0	(1)
Total net periodic benefit cost and OCI	13	5	3
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	0	(1)	0
Total recognized in OCI	0	(1)	0
Total net periodic benefit cost and OCI	$ 0	$ (1)	$ 0