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Leases (Maturities Of Lease Liabilities) (Details)
$ in Millions
Sep. 30, 2019
USD ($)
Leases [Abstract]  
2019 (remainder) $ 1
2020 4
2021 4
2022 4
2023 3
2024 2
Thereafter 13
Total lease payments 32
Less imputed interest (9)
Total $ 23