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Derivative Instruments and Hedging Activities (Fair Value Of Derivatives Designated As Hedging Instruments) (Details) - Designated As Hedging Instrument [Member] - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Derivative [Line Items]    
Interest Rate Derivative Assets, at Fair Value $ 0 $ 0
Interest Rate Derivative Liabilities, at Fair Value 32 20
Derivative Instruments in Hedges, Assets, at Fair Value 0 0
Derivative Instruments in Hedges, Liabilities, at Fair Value $ 32 $ 20