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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2019
Text Block [Abstract]  
Schedule Of Basic And Diluted Earnings Per Share
                         
 
Years Ended December 31,
 
In millions except per share amounts
 
2019
 
  
2018
 
  
2017
 
Basic earnings per share:
 
 
 
  
 
 
  
 
 
Net income (loss) available to common shareholders
   
(359
 )     
(296
 )    
(1,605
 )
Basic weighted average shares
(1)
    
81.0
     
89.0
     
118.9
 
 
                        
Net income (loss) per basic common share
  $
 (4.43
 )    $
(3.33
 )   $
(13.50
 )
Diluted earnings per share:
 
 
 
  
 
 
  
 
 
Net income (loss) available to common shareholders
   
(359
 )     
(296
 )    
(1,605
 )
Diluted weighted average shares
   
81.0
     
89.0
     
118.9
 
 
                        
Net income (loss) per diluted common share
  $
 (4.43
 )    $
(3.33
 )   $
(13.50
 )
Potentially dilutive securities excluded from the diluted EPS because of antidilutive affect
   
4.3
     
4.4
     
14.1
 
 
 
 
 
 
 
 
 
 
 
 
(1)
Includes 1.0 million, 0.8 million and 0.3 million of participating securities that met the service condition and were eligible to receive nonforfeitable dividends or dividend equivalents for the years ended December 31, 2019, 2018 and 2017, respectively.