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Leases (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Jan. 01, 2019
Dec. 31, 2018
Lessee, Lease, Description [Line Items]            
Operating lease expense $ 1 $ 2 $ 3 $ 4    
Operating Lease, Liability 23   23      
Operating Lease, Right-of-Use Asset $ 17   $ 17     $ 0
Operating Leases, Future Minimum Payments Due, Next Twelve Months           4
Operating Leases, Future Minimum Payments, Due in Two Years           4
Operating Leases, Future Minimum Payments, Due in Three Years           4
Operating Leases, Future Minimum Payments, Due in Four Years           3
Operating Leases, Future Minimum Payments, Due in Five Years           3
Operating Leases, Future Minimum Payments, Due Thereafter           12
Operating Leases, Lease Incentives           $ 5
Maximum [Member]            
Lessee, Lease, Description [Line Items]            
Leases, Remaining Lease Term Years     15 years      
Leases, Renewal Term     5 years      
Minimum [Member]            
Lessee, Lease, Description [Line Items]            
Leases, Remaining Lease Term Years     1 year      
Accounting Standards Update 2016-02 [Member]            
Lessee, Lease, Description [Line Items]            
Operating Lease, Liability         $ 24  
Operating Lease, Right-of-Use Asset         $ 24