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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, 2024
Dec. 31, 2023
Derivative [Line Items]    
Price Risk Cash Flow Hedge Asset, at Fair Value $ 11 $ 16
Derivative Instruments in Hedges, Net Investment in Foreign Operations, Assets, Fair Value 42 0
Derivative Instruments in Hedges, Assets, at Fair Value 53 16
Price Risk Fair Value Hedge Liability, at Fair Value 0 0
Derivative Instruments in Hedges, Net Investment in Foreign Operations, Liabilities, Fair Value 0 22
Derivative Instruments in Hedges, Liabilities, at Fair Value $ 0 $ 22