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Derivative Instruments and Hedging Activities (Fair Value Of Derivatives Designated As Hedging Instruments) (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Derivative [Line Items]    
Interest Rate Derivative Assets, at Fair Value $ 20  
Interest Rate Derivative Liabilities, at Fair Value 0  
Designated As Hedging Instrument [Member]    
Derivative [Line Items]    
Interest Rate Derivative Assets, at Fair Value 20 $ 21
Interest Rate Derivative Liabilities, at Fair Value   0
Derivative Instruments in Hedges, Assets, at Fair Value 20 21
Derivative Instruments in Hedges, Liabilities, at Fair Value $ 0 $ 0