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Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 2021
Text Block [Abstract]  
Schedule Of Basic And Diluted Earnings Per Share
The following table presents the computation of basic and diluted earnings per share for the three months ended March 31, 2021 and 2020:
 
                                   
    
Three Months
Ended
March 31,
In millions except per share amounts
   
2021
  
2020
Basic earnings per share:
                 
Net income (loss) available to common shareholders
   
$
(106
) 
  
$
 
 
(333
) 
Basic weighted average shares
(1)
   
 
49.3
 
  
 
72.1
 
 
   
 
 
 
  
 
 
 
Net income (loss) per basic common share
   
$
(2.16
) 
  
$
(4.62
) 
    
 
 
 
  
 
 
 
Diluted earnings per share:
                 
Net income (loss) available to common shareholders
   
$
(106
) 
  
$
 
(333
) 
Diluted weighted average shares
(1)
   
 
49.3
 
  
 
72.1
 
    
 
 
 
  
 
 
 
Net income (loss) per diluted common share
   
$
(2.16
) 
  
$
(4.62
) 
    
 
 
 
  
 
 
 
Potentially dilutive securities excluded from the calculation of diluted EPS because of antidilutive affect
   
 
5.0
 
  
 
4.9
 
 
(1) -
 Includes 0.9 million of participating securities that met the service condition and were eligible to receive nonforfeitable dividends or dividend equivalents for each of the three months ended March 31, 2021 and 2020, respectively.