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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
Dec. 31, 2020
Dec. 31, 2019
Derivative [Line Items]    
Derivative Instruments in Hedges, Net Investment in Foreign Operations, Assets, Fair Value $ 0 $ 13
Derivative Instruments in Hedges, Net Investment in Foreign Operations, Liabilities, Fair Value 265 5
Interest Rate Derivative Assets, at Fair Value 61 3
Interest Rate Derivative Liabilities, at Fair Value 15 43
Derivative Instruments in Hedges, Assets, at Fair Value 61 16
Derivative Instruments in Hedges, Liabilities, at Fair Value $ 280 $ 48