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Derivative Assets And Liabilities Table - Interest Rate Swaps Outstanding (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2020
Dec. 31, 2019
July 2020 [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 [1],[3] $ 0 $ 400
July 2021 [Member]    
Description of Interest Rate Derivative Activities [2],[3] Forward-starting to pay a fixed rate of 3.55% and receive a floating rate  
Derivative, Notional Amount [3] $ 400 400
July 2022 [Member]    
Description of Interest Rate Derivative Activities [2],[3] Forward-starting to pay a fixed rate of 3.80% and receive a floating rate  
Derivative, Notional Amount [3] $ 400 $ 400
[1]
The July 2020 interest rate swaps were terminated in January 2020.
[2] Floating rates are based on 3-month LIBOR.
[3] Represents the effective date. These forward-starting swaps have terms of 30 years with a mandatory termination date the same as the effective date.