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Income Taxes (Tables)
9 Months Ended
Sep. 30, 2018
Income Tax Disclosure [Abstract]  
Schedule of Effective Income Tax Rate Reconciliation
The income tax provision consisted of the following:
 
Three months ended September 30,
 
Nine months ended September 30,
In millions, except rates
2018
 
2017
 
2018
 
2017
Income before income taxes
$
313

 
$
186

 
$
620

 
$
119

Income tax expense from continuing operations
7

 
1

 
19

 
3

Effective tax rate
2.2
%
 
0.5
%

3.1
%

2.5
%