Employee Benefits (Schedule Of Amounts Recognized In Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plans [Member] | Domestic Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Net loss (gain)	$ (36)	$ (71)
Total before tax	(36)	(71)
Defined Benefit Plans [Member] | Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Net loss (gain)	9	9
Total before tax	9	9
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated other comprehensive income (loss), benefits, net of tax	(22)	(43)
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated other comprehensive income (loss), benefits, net of tax	(5)	0
Other Postretirement Benefits Plan [Member] | Domestic Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Net loss (gain)	(6)	(5)
Total before tax	(6)	(5)
Other Postretirement Benefits Plan [Member] | Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Net loss (gain)	0	0
Total before tax	$ 0	$ 0