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Stock Plans (Restricted Shares Outstanding) (Details) - Restricted Stock [Member] - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Balance at beginning of period (in shares) 1,858,000  
Restricted stock granted (in shares) 105,000 1,996,000
Restricted stock vested (in shares) (701,000)  
Restricted stock forfeited (in shares) (18,000)  
Balance at end of period (in shares) 1,244,000  
Balance at beginning of period (in dollars per shares) $ 16.02  
Restricted stock granted (in dollars per shares) 2.00  
Restricted stock vested (in dollars per shares) 21.99  
Restricted stock forfeited (in dollars per shares) 30.37  
Balance at end of period (in dollars per shares) $ 11.28 $ 8.30
Balance at beginning of period, Aggregate fair value $ 4  
Restricted stock granted, Aggregate fair value   $ 11
Restricted stock vested, Aggregate fair value (1)  
Balance at end of period, Aggregate fair value $ 2 $ 11