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Derivative Financial Instruments (Schedule Of Open Interest Rate Swap Derivative Positions) (Details)
$ in Millions
 9 Months Ended
Sep. 30, 2015
USD ($)
Interest Rate Contract 0.92% Expiration December 2016 [Member]  
Derivative [Line Items]  
Notional $ 100
Rate Received Three Month LIBOR
Rate Paid, percent 0.92%
Expiration Dec. 01, 2016
Interest Rate Contract 1.76% Expiration January 2019 [Member]  
Derivative [Line Items]  
Notional $ 100
Rate Received, percent 1.76%
Rate Paid Three Month LIBOR
Expiration Jan. 01, 2019
Interest Rate Contract 2.98% Expiration December 2048 [Member]  
Derivative [Line Items]  
Notional $ 750
Rate Received Three Month LIBOR
Rate Paid, percent 2.98%
Expiration Dec. 01, 2048