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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, 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

X

- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

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- Definition

General discussion of the entity's interest rate derivative activities.

+ References

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