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Derivative Instruments and Hedging Activities (Fair Value Of Derivatives Designated As Hedging Instruments) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Derivative [Line Items]    
Document Period End Date Dec. 31, 2019  
Designated As Hedging Instrument [Member]    
Derivative [Line Items]    
Derivative Instruments in Hedges, Net Investment in Foreign Operations, Assets, Fair Value $ 13 $ 0
Derivative Instruments in Hedges, Net Investment in Foreign Operations, Liabilities, Fair Value 5 0
Interest Rate Derivative Assets, at Fair Value 3 0
Interest Rate Derivative Liabilities, at Fair Value 43 20
Derivative Instruments in Hedges, Assets, at Fair Value 16 0
Derivative Instruments in Hedges, Liabilities, at Fair Value $ 48 $ 20