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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2015
Share-based Compensation  
Schedule of non-cash compensation expense and capitalized non-cash compensation
The following table summarizes non-cash compensation expense attributable to stock awards for the three and six months ended June 30, 2015 and 2014 (dollars in millions):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2015
 
2014
 
2015
 
2014
Outperform Stock Options
$
1

 
$
2

 
$
3

 
$
4

Restricted Stock Units
11

 
6

 
22

 
12

Performance Restricted Stock Units
8

 
3

 
13

 
3

401(k) Match Expense
7

 
5

 
20

 
12

Restricted Stock Unit Bonus Grant
—

 
—

 
—

 
(5
)
 
$
27

 
$
16

 
$
58

 
$
26