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Stock-Based Compensation
 6 Months Ended
Jun. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock-Based Compensation
STOCK-BASED COMPENSATION
For employee awards, equity classified stock-based compensation cost is measured at the service inception date or the grant date, based on the estimated achievement of certain performance metrics or the fair value of the award, and is recognized as expense or capitalized as a component of property, plant and equipment over the requisite service period.
The Duke Energy Corporation 2015 Long-Term Incentive Plan (the 2015 Plan) provides for the grant of stock-based compensation awards to employees and outside directors. The 2015 Plan reserves 10 million shares of common stock for issuance under the Plan. The 2015 Plan supersedes the 2010 Long-Term Incentive Plan, as amended (the 2010 Plan) and the Progress Energy, Inc. 2007 Equity Incentive Plan (the Progress Plan). No additional grants will be made from the 2010 Plan and the Progress Plan.
Pretax stock-based compensation costs, the tax benefit associated with stock-based compensation expense, and stock-based compensation costs capitalized are included in the following table.
 
Three Months Ended June 30,
 
Six Months Ended June 30,
(in millions)
2015

 
2014

 
2015

 
2014

Restricted stock unit awards
$
11

 
$
11

 
$
20

 
$
22

Performance awards
8

 
5

 
13

 
10

Pretax stock-based compensation cost
$
19

 
$
16

 
$
33

 
$
32

Tax benefit associated with stock-based compensation expense
$
7

 
$
6

 
$
12

 
$
12

Stock-based compensation costs capitalized
1

 
1

 
2

 
2