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Stock-Based Compensation
 9 Months Ended
Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock-Based Compensation
STOCK-BASED COMPENSATION
Stock-based compensation awarded to employees or outside directors is measured at the service inception date or grant date. The fair value of the award is expensed or capitalized over the requisite service period. For awards with performance conditions, the probability of vesting is assessed at each reporting period and compensation cost is adjusted based upon that assessment.
The following table presents information related to Duke Energy's stock–based compensation.
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
(in millions)
2018

 
2017

 
2018

 
2017

Restricted stock unit awards
$
10

 
$
10

 
$
32

 
$
30

Performance awards
13

 
7

 
27

 
20

Pretax stock-based compensation cost
$
23

 
$
17

 
$
59

 
$
50

Stock-based compensation cost capitalized
$
1

 
$
1

 
$
3

 
$
2

Stock-based compensation expense
$
22

 
$
16

 
$
56

 
$
48

Tax benefit associated with stock-based compensation expense
$
5

 
$
6

 
$
13

 
$
18