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Stock-Based Compensation
9 Months Ended
Sep. 30, 2017
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.
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
 
Nine Months Ended
 
September 30,
 
September 30,
(in millions)
2017

 
2016

 
2017

 
2016

Restricted stock unit awards
$
10

 
$
8

 
$
30

 
$
25

Performance awards
7

 
4

 
20

 
14

Pretax stock-based compensation cost
$
17

 
$
12

 
$
50

 
$
39

Tax benefit associated with stock-based compensation expense
$
6

 
$
5

 
$
18

 
$
14

Stock-based compensation costs capitalized
1

 

 
2

 
2


Prior to Duke Energy acquiring Piedmont, Piedmont had an incentive compensation plan for eligible officers and other participants. Piedmont's total pretax stock-based compensation costs were approximately $2 million and $5 million for the three and nine months ended September 30, 2016, respectively. The tax benefit associated with Piedmont's stock-based compensation expense for the three and nine months ended September 30, 2016, was immaterial.