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Revolving Credit Agreement Borrowings - Schedule of Revolving Credit Agreement Borrowings (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Line of Credit Facility [Line Items]    
Revolving credit facility $ 234 $ 0
2018 Revolver | Revolving Credit Facility    
Line of Credit Facility [Line Items]    
Revolving credit facility $ 234  
Annual contractual interest rate 1.81%  
Effective interest rate 2.19%