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Parent Company Stock Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Nonvested Restricted Stock Units Activity
The following table summarizes information about RSUs and PSUs granted to our employees and key executive officers under the parent company stock-based compensation programs (units in thousands):
 
Year Ended December 31, 2014
 
Shares
 
Weighted-Average Grant Date Fair Value
 
Weighted-Average Remaining Contractual Term (years)
Outstanding at beginning of period
1,582

 
$
27.34

 
1.1
Granted
757

 
$
35.97

 
 
Settled
(834
)
 
$
25.64

 
 
Forfeited or expired
(96
)
 
$
30.70

 
 
Outstanding at end of period
1,409

 
$
32.75

 
1.5
Units unvested and expected to vest at December 31, 2014
1,115

 
$
33.87

 
1.8
Units vested and payable at December 31, 2014
247

 
$
27.51

 
 
Schedule of Compensation Expense
The following table summarizes compensation expense recorded for stock-based incentive plans (in millions):
 
 
Years Ended December 31,
 
 
2014
 
2013
 
2012
Compensation expense
 
$
19

 
$
21

 
$
17

Income tax benefit
 
8

 
8

 
7

Compensation expense, net of tax
 
$
11

 
$
13

 
$
10