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Stock Plans (Narrative) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
ShareBasedCompensationPlan
Item
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
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 3    
Number of stock-based compensation plan under which grants were not made | ShareBasedCompensationPlan 2    
2017 EIP [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Plan authorization period 10 years    
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 3,198,000    
Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expense recognized during the period $ 4 $ 5 $ 1
Performance Shares      
Initial period over which target number of performance shares are awarded 90 days    
Measurement period 3 years    
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expense recognized during the period $ 11 13 18
Restricted Stock      
Remaining unrecognized compensation cost associated with unvested restricted stock awards $ 4    
Weighted average period over which unvested restricted stock awards unrecognized compensation cost is expected to be recognized (in years) 1 year    
Stock Options [Member] | 2017 EIP [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 4 years    
Director Plans [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expense recognized during the period $ 1 $ (1) $ (5)
Non Employee Directors Compensation Plans      
Plan units earned during the period (in shares) | shares 155,045 183,791 94,034
Number of directors participating in the plan during the period | Item 13    
Cash compensation $ 4 $ 1 $ 1