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Leases (Maturities Of Lease Liabilities) (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Leases [Abstract]    
2020 (remainder) $ 1  
2021 4  
2022 4  
2023 4  
2024 2  
2025 1  
Thereafter 12  
Total lease payments 28  
Less imputed interest (7)  
Total $ 21 $ 23