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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
In millions
2016
 
2015
 
2016
 
2015
Stock-based compensation:
 
 
 
 
 
 
 
Stock options
$
20

 
$
22

 
$
60

 
$
67

Restricted stock units
38

 
65

 
106

 
108

Total stock-based compensation
$
58

 
$
87

 
$
166

 
$
175