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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock-based compensation
Stock-based compensation for the periods ended September 30 is as follows:
(in millions)
Three Months
 
Nine Months
 
2016
 
2015
 
2016
 
2015
Stock option expense 1
$
2

 
$
2

 
$
6

 
$
11

Restricted stock and unit awards expense
18

 
16

 
48

 
44

Total stock-based compensation expense 
$
20

 
$
18

 
$
54

 
$
55


1 
There were a minimal amount of stock options granted in 2015. During 2015, the Company stopped granting stock options.