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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule Of Stock-Based Compensation Expense
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