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Stock Plans (Narrative) (Details)
$ in Millions
6 Months Ended
Jun. 30, 2020
USD ($)
ShareBasedCompensationPlan
shares
Jun. 30, 2019
USD ($)
Dec. 31, 2019
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 3,514,000    
Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares authorized for grant under the plans (in shares) | shares     96,000
Expense recognized during the period | $ $ 0 $ 0  
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expense recognized during the period | $ 2 $ 5  
Restricted Stock      
Remaining unrecognized compensation cost associated with unvested restricted stock awards | $ $ 2    
Weighted average period over which unvested restricted stock awards unrecognized compensation cost is expected to be recognized (in years) 1 year