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Income Taxes (Tables)
 6 Months Ended
Jun. 30, 2019
Text Block [Abstract]  
Income (loss) from operations before provision (benefit) for income taxes
                                 
 
Three Months Ended June 30,
   
Six Months Ended June 30,
 
In millions
 
2019
   
2018
   
2019
   
2018
 
Income (loss) before income taxes
 
$
(207
)  
$
(146
)
  
$
(226
)  
$
(242
)
Provision (benefit) for income taxes
 
$
(37
)  
$
-
   
$
(39
)  
$
2
 
Effective tax rate
   
17.9%
      
0.0%
      
17.3%
      
-0.8%