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Derivative Assets And Liabilities (Interest Rate Swaps Outstanding) (Details) - Derivatives Not Designated As Hedging Instruments - Interest Rate Derivatives [Member] - Forward-Starting Swaps [Member] - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
July 2019 [Member]    
Description of Interest Rate Derivative Activities [1],[2],[3] Forward-starting to pay a fixed rate of 3.52% and receive a floating rate  
Derivative, Notional Amount [2],[3] $ 0 $ 400
July 2021 [Member]    
Description of Interest Rate Derivative Activities [1],[2] Forward-starting to pay a fixed rate of 3.55% and receive a floating rate  
Derivative, Notional Amount [2] $ 400 400
July 2022 [Member]    
Description of Interest Rate Derivative Activities [1],[2] Forward-starting to pay a fixed rate of 3.80% and receive a floating rate  
Derivative, Notional Amount [2] $ 400 $ 400
[1] Floating rates are based on 3-month LIBOR.
[2] Represents the effective date. These forward-starting swaps have terms of 30 years with a mandatory termination date the same as the effective date.
[3] The July 2020 interest rate swaps were terminated in January 2020.