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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.

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