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Stock Plans (Narrative) (Details)
$ in Millions
12 Months Ended
Feb. 16, 2017
shares
Feb. 11, 2016
shares
Feb. 25, 2015
shares
Dec. 31, 2017
USD ($)
ShareBasedCompensationPlan
entity
shares
Dec. 31, 2016
USD ($)
shares
Dec. 31, 2015
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    
Shares authorized for grant under the plans (in shares) | shares       5,667,000    
Shares available for grant under the plan (in shares) | shares       4,361,000    
2017 EIP [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Plan authorization period       10 years    
Performance Shares [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Expense recognized during the period | $       $ 1 $ 6 $ 7
Shares granted (in shares) | shares 157,400 1,669,000 665,000 211,000 111,000 49,000
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 | $       $ 18 $ 18 $ 20
Shares granted (in shares) | shares       454,000 396,000 188,000
Restricted Stock            
Remaining unrecognized compensation cost associated with unvested restricted stock awards | $       $ 21    
Weighted average period over which unvested restricted stock awards unrecognized compensation cost is expected to be recognized (in years)       1 year 2 months 12 days    
Stock Options [Member] | 2017 EIP [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period       4 years    
Non-Employee Director [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Expense recognized during the period | $       $ (5) $ 0 $ (1)
Non Employee Directors Compensation Plans            
Plan units earned during the period (in shares) | shares       94,034 29,618 22,279
Number of directors participating in the plan during the period | entity       9    
Cash compensation | $       $ 1 $ 1 $ 1