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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, 2021
Dec. 31, 2020
Derivative [Line Items]    
Derivative Instruments in Hedges, Net Investment in Foreign Operations, Assets, Fair Value $ 0 $ 0
Derivative Instruments in Hedges, Net Investment in Foreign Operations, Liabilities, Fair Value 148 265
Interest Rate Derivative Assets, at Fair Value 130 61
Interest Rate Derivative Liabilities, at Fair Value 2 15
Derivative Instruments in Hedges, Assets, at Fair Value 130 61
Derivative Instruments in Hedges, Liabilities, at Fair Value $ 150 $ 280