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Leases (Supplemental Balance Sheet Information Related To Lease) (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Leases [Abstract]    
Operating lease right-of-use assets $ 23  
Less lease incentives (6)  
Operating lease right-of-use asset, net 17 $ 0
Other accrued liabilities 3  
Operating lease liabilities 20 $ 0
Total operating lease liabilities $ 23