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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 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 June 30,
 
Six Months Ended June 30,
In millions
2016
 
2015
 
2016
 
2015
Stock-based compensation:
 
 
 
 
 
 
 
Stock options
$
17

 
$
19

 
$
39

 
$
45

Restricted stock units
33

 
25

 
68

 
43

Total stock-based compensation
$
50

 
$
44

 
$
107

 
$
88