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Derivative Assets And Liabilities Table - Interest Rate Swaps Outstanding (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2019
Dec. 31, 2018
March 2019 [Member]    
Notional Amount $ 0 $ 300
Type [1] Pay a floating rate and receive a fixed rate of 1.42%  
July 2020 [Member]    
Notional Amount $ 400 [2] 400
Type [1],[2] Forward-starting to pay a fixed rate of 3.52% and receive a floating rate  
July 2021 [Member]    
Notional Amount $ 400 [2] 400
Type [1],[2] Forward-starting to pay a fixed rate of 3.55% and receive a floating rate  
July 2022 [Member]    
Notional Amount $ 400 [2] 0
Type [1],[2] Forward-starting to pay a fixed rate of 3.80% and receive a floating rate  
July 2019 [Member]    
Notional Amount $ 0 [2] $ 400
Type [1],[2] Forward-starting to pay a fixed rate of 3.56% and receive a floating rate  
[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.