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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 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 months ended March 31, 2015 and 2014 (dollars in millions):
 
Three Months Ended March 31,
 
2015
 
2014
Outperform Stock Options
$
2

 
$
2

Restricted Stock Units
11

 
6

Performance Restricted Stock Units
5

 
—

401(k) Match Expense
13

 
7

Restricted Stock Unit Bonus Grant
—

 
(5
)
 
$
31

 
$
10