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Accumulated Other Comprehensive Income (Loss) (Tables)
 6 Months Ended
Jun. 30, 2017
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, 2017 and 2016:

 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
In millions
2017

2016
 
2017
 
2016
Beginning balance
$
(1,643
)
 
$
(1,332
)
 
$
(1,807
)
 
$
(1,504
)
 
 
 
 
 
 
 
 
Foreign currency translation adjustments during the period
60

 
(124
)
 
204

 
—

Foreign currency translation adjustments reclassified to income
—

 
—

 
—

 
1

Income taxes
57

 
(20
)
 
67

 
19

Total foreign currency translation adjustments, net of tax
117

 
(144
)
 
271

 
20

 
 
 
 
 
 
 
 
Pension and other postretirement benefit adjustments during the period
—

 
—

 
—

 
1

Pension and other postretirement benefit adjustments reclassified to income
13

 
9

 
27

 
20

Income taxes
(3
)
 
(3
)
 
(7
)
 
(7
)
Total pension and other postretirement benefit adjustments, net of tax
10

 
6

 
20

 
14

 
 
 
 
 
 
 
 
Ending balance
$
(1,516
)
 
$
(1,470
)
 
$
(1,516
)
 
$
(1,470
)