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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Changes in Accumulated Other Comprehensive Income (Loss)
The changes in accumulated other comprehensive income (loss) during 2017, 2016 and 2015 were as follows:

In millions
 
2017
 
2016
 
2015
Beginning balance
 
$
(1,807
)
 
$
(1,504
)
 
$
(658
)
 
 
 
 
 
 
 
Foreign currency translation adjustments during the period
 
294

 
(251
)
 
(800
)
Foreign currency translation adjustments reclassified to income
 
2

 
(1
)
 
—

Income taxes
 
110

 
(25
)
 
(60
)
Total foreign currency translation adjustments, net of tax
 
406

 
(277
)
 
(860
)
 
 
 
 
 
 
 
Pension and other postretirement benefit adjustments during the period
 
96

 
(67
)
 
(41
)
Pension and other postretirement benefit adjustments reclassified to income
 
56

 
43

 
61

Income taxes
 
(38
)
 
(2
)
 
(6
)
Total pension and other postretirement benefit adjustments, net of tax
 
114

 
(26
)
 
14

 
 
 
 
 
 
 
Ending balance
 
$
(1,287
)
 
$
(1,807
)
 
$
(1,504
)