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Derivative Assets And Liabilities Table - Interest Rate Swaps Outstanding (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
July 2020 [Member]    
Derivative, Notional Amount $ 0 [1] $ 400
Type [1],[2] Forward-starting to pay a fixed rate of 3.52% and receive a floating rate  
July 2021 [Member]    
Derivative, Notional Amount $ 400 [1] 400
Type [1],[2] Forward-starting to pay a fixed rate of 3.55% and receive a floating rate  
July 2022 [Member]    
Derivative, Notional Amount $ 400 [1] $ 400
Type [1],[2] Forward-starting to pay a fixed rate of 3.80% and receive a floating rate  
[1] Represents the effective date. These forward-starting swaps have terms of 30 years with a mandatory termination date the same as the effective date.
[2] Floating rates are based on 3-month LIBOR.