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Stock-Based Compensation (Tables)
3 Months Ended
Mar. 31, 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, restricted stock units ("RSUs") and performance stock units ("PSUs"), is as follows:
 
Three Months Ended
March 31,
(In millions)
2015
 
2014
Compensation expense
$
4

 
$
8

Income tax benefit
(1
)
 
(3
)
Total
$
3

 
$
5