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Stock Plans (Narrative) (Details)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
ShareBasedCompensationPlan
$ / shares
shares
Mar. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / 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 2,759,000    
Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expense recognized during the period $ 0 $ 1  
Shares granted (in shares) | shares    
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expense recognized during the period $ 3 $ 3  
Shares granted (in shares) | shares 5,000 1,897,000  
Restricted Stock      
Restricted stock granted, Aggregate fair value $ 14  
Restricted stock vested, fair value 1    
Fair value of unvested restricted stock $ 2 $ 17 $ 4
Restriced stock, grant date fair value per share | $ / shares $ 14.41 $ 8.23 $ 16.02
Remaining unrecognized compensation cost associated with unvested restricted stock awards $ 12    
Weighted average period over which unvested restricted stock awards unrecognized compensation cost is expected to be recognized (in years) 1 year