Derivatives (Schedule Of Interest Rate Swaps) (Details) - Cash Flow Hedging [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	May 22, 2018
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	$ 150	$ 150
Weighted average fixed pay rate	2.90%
Weighted average 3-month LIBOR receive rate	2.38%
Weighted average maturity	2 years 5 months 5 days