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

 
$
3

 
$
4

 
$
9

Restricted stock and unit awards expense
18

 
16

 
30

 
28

Total stock-based compensation expense 
$
20

 
$
19

 
$
34

 
$
37


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