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Leases (Supplemental Balance Sheet Information Related To Lease) (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Leases [Abstract]    
Operating lease right-of-use assets $ 21 $ 23
Less lease incentives (6) (6)
Operating lease right-of-use assets, net 15 17
Other accrued liabilities 3 3
Operating lease liabilities 18 20
Total operating lease liabilities $ 21 $ 23