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Stock-Based Compensation
3 Months Ended
Mar. 31, 2015
Share-based Compensation [Abstract]  
Stock-Based Compensation
STOCK-BASED COMPENSATION
The following table summarizes the stock-based compensation expenses included in our Condensed Consolidated Statements of Income (in millions):
 
 
Three Months Ended
 
 
March 31,
 
 
2015
 
2014
Cost of goods sold
 
$
3

 
$
3

Research and development expenses
 
42

 
34

Selling, general and administrative expenses
 
47

 
45

Stock-based compensation expense included in total costs and expenses
 
92

 
82

Income tax effect
 
(23
)
 
(19
)
Stock-based compensation expense, net of tax
 
$
69

 
$
63