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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Stock-Based Compensation
Stock-based compensation for the periods ended September 30 is as follows:
(in millions)
Three Months
 
Nine Months
 
2018
 
2017
 
2018
 
2017
Stock option expense
$
1

 
$
1

 
$
3

 
$
2

Restricted stock and unit awards expense
26

 
23

 
70

 
63

Total stock-based compensation expense 
$
27

 
$
24

 
$
73

 
$
65