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Amended Credit Agreement (Details) - Credit Facility
9 Months Ended
Sep. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Line of Credit Facility [Line Items]    
Number of extension you can request 2  
Credit Facility [1] $ 700,000,000  
Outstanding [2] 9,000,000  
Available 691,000,000  
Direct advances on the credit facility outstanding $ 0 $ 0
[1] This credit facility expires in June 2024.
[2] Includes outstanding commercial paper and letters of credit.