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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule Of Stock-Based Compensation Expense
Duke Energy recorded pretax stock-based compensation expense as follows.
 
Three Months Ended June 30,
 
Six Months Ended June 30,
(in millions)
2014

 
2013

 
2014

 
2013

Stock options
$
—

 
$
—

 
$
—

 
$
2

Restricted stock unit awards
11

 
12

 
22

 
26

Performance awards
5

 
7

 
10

 
18

Total
$
16

 
$
19

 
$
32

 
$
46

Tax benefit associated with stock-based compensation expense
$
6

 
$
8

 
$
12

 
$
18

Stock-based compensation costs capitalized
1

 
1

 
2

 
2