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Accumulated Other Comprehensive Income (Loss) (Tables)
 6 Months Ended
Jun. 30, 2018
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
The following table summarizes changes in Accumulated other comprehensive income (loss) for the three and six months ended June 30, 2018 and 2017:

 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
In millions
2018

2017
 
2018
 
2017
Beginning balance
$
(1,240
)
 
$
(1,643
)
 
$
(1,287
)
 
$
(1,807
)
 
 
 
 
 
 
 
 
Adoption of new accounting guidance related to reclassification of certain tax effects
—

 
—

 
(45
)
 
—

 
 
 
 
 
 
 
 
Foreign currency translation adjustments during the period
(270
)
 
60

 
(201
)
 
204

Income taxes
(29
)
 
57

 
(15
)
 
67

Total foreign currency translation adjustments, net of tax
(299
)
 
117

 
(216
)
 
271

 
 
 
 
 
 
 
 
Pension and other postretirement benefit adjustments during the period
—

 
—

 
1

 
—

Pension and other postretirement benefit adjustments reclassified to income
11

 
13

 
21

 
27

Income taxes
(2
)
 
(3
)
 
(4
)
 
(7
)
Total pension and other postretirement benefit adjustments, net of tax
9

 
10

 
18

 
20

 
 
 
 
 
 
 
 
Ending balance
$
(1,530
)
 
$
(1,516
)
 
$
(1,530
)
 
$
(1,516
)