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Restructuring Charges (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Restructuring Cost and Reserve [Line Items]          
Restructuring charges $ 0 $ 0 $ 4 $ 0  
Restructuring charges, net of tax     3    
Lease termination cost     2    
Maximum [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring charges 1 1   1  
Restructuring charges, net of tax 1 $ 1   $ 1  
Restructuring Reserve $ 1   $ 1   $ 1