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Stock-Based Compensation
 6 Months Ended
Jun. 30, 2018
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 following table presents information related to Duke Energy's stock–based compensation.
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
(in millions)
2018

 
2017

 
2018

 
2017

Restricted stock unit awards
$
12

 
$
12

 
$
22

 
$
20

Performance awards
7

 
6

 
14

 
13

Pretax stock-based compensation cost
$
19

 
$
18

 
$
36

 
$
33

Stock-based compensation cost capitalized
$
1

 
$
—

 
$
2

 
$
1

Stock-based compensation expense
$
18

 
$
18

 
$
34

 
$
32

Tax benefit associated with stock-based compensation expense
$
4

 
$
7

 
$
8

 
$
12