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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 |
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Dec. 31, 2021 | Dec. 31, 2020
July 2021 [Member] |  |
Description of Interest Rate Derivative Activities | Forward-starting to pay a fixed rate of 3.55% and receive a floating rate |
Derivative, Notional Amount | $ 0 | $ 400
July 2022 [Member] |  |
Description of Interest Rate Derivative Activities | Forward-starting to pay a fixed rate of 3.80% and receive a floating rate |
Derivative, Notional Amount | $ 400 | 400
July 2023 |  |
Description of Interest Rate Derivative Activities | Forward-starting to pay a fixed rate of 3.78% and receive a floating rate |
Derivative, Notional Amount | $ 200 | 0
July 2024 |  |
Description of Interest Rate Derivative Activities | Forward-starting to pay a fixed rate of 3.88% and receive a floating rate |
Derivative, Notional Amount | $ 200 | $ 0

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