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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2015
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
A summary of the total compensation expense and associated income tax benefits recognized under all plans, including the cost of stock options, RSUs and PSUs, is as follows:
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
(In millions)
2015
 
2014
 
2015
 
2014
Compensation expense
$
5

 
$
5

 
$
9

 
$
13

Income tax benefit
(2
)
 
(2
)
 
(3
)
 
(5
)
Total
$
3

 
$
3

 
$
6

 
$
8