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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2019
Equity [Abstract]  
Changes in Accumulated Other Comprehensive Income (Loss) The changes in accumulated other comprehensive income (loss) during 2019, 2018 and 2017 were as follows:

In millions
 
2019
 
2018
 
2017
Beginning balance
 
$
(1,677
)
 
$
(1,287
)
 
$
(1,807
)
 
 
 
 
 
 
 
Adoption of new accounting guidance related to reclassification of certain tax effects
 
—

 
(45
)
 
—

 
 
 
 
 
 
 
Foreign currency translation adjustments during the period
 
7

 
(308
)
 
294

Foreign currency translation adjustments reclassified to income
 
—

 
5

 
2

Income taxes
 
(9
)
 
(25
)
 
110

Total foreign currency translation adjustments, net of tax
 
(2
)
 
(328
)
 
406

 
 
 
 
 
 
 
Pension and other postretirement benefit adjustments during the period
 
(54
)
 
(64
)
 
96

Pension and other postretirement benefit adjustments reclassified to income
 
21

 
41

 
56

Income taxes
 
7

 
6

 
(38
)
Total pension and other postretirement benefit adjustments, net of tax
 
(26
)
 
(17
)
 
114

 
 
 
 
 
 
 
Ending balance
 
$
(1,705
)
 
$
(1,677
)
 
$
(1,287
)