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Stock Plans (Narrative) (Details)
$ / shares in Units, $ in Millions
9 Months Ended
Sep. 30, 2019
USD ($)
ShareBasedCompensationPlan
$ / shares
shares
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of stock-based compensation plan under which grants were made | ShareBasedCompensationPlan 7    
Number of stock-based compensation plan under which grants were not made | ShareBasedCompensationPlan 6    
EIP Plans [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares authorized for grant under the plans (in shares) | shares 5,667,000    
Shares available for grant under the plan (in shares) | shares 2,801,000    
Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares authorized for grant under the plans (in shares) | shares     497,000
Expense recognized during the period $ 3    
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expense recognized during the period $ 7 $ 10  
Shares granted (in shares) | shares 105,000    
Restricted Stock      
Restricted stock vested, fair value $ 1    
Fair value of unvested restricted stock $ 1   $ 4
Restriced stock, grant date fair value per share | $ / shares $ 11.26   $ 16.02
Remaining unrecognized compensation cost associated with unvested restricted stock awards $ 8    
Weighted average period over which unvested restricted stock awards unrecognized compensation cost is expected to be recognized (in years) 1 year