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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule Of Total Stock-Based Compensation Expense, net of tax
The following table summarizes the total expense recognized by the Duke Energy Registrants, net of tax, for stock-based compensation.
  
Years Ended December 31,
(in millions)
2015

 
2014

 
2013

Duke Energy
$
38

 
$
38

 
$
52

Duke Energy Carolinas
14

 
12

 
13

Progress Energy
14

 
14

 
23

Duke Energy Progress
9

 
9

 
14

Duke Energy Florida
5

 
5

 
9

Duke Energy Ohio
2

 
5

 
4

Duke Energy Indiana
4

 
3

 
4

 
Schedule Of Stock-Based Compensation Expense
Duke Energy's 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.
  
Years Ended December 31,
(in millions)
2015

 
2014

 
2013

Restricted stock unit awards
$
38

 
$
39

 
$
49

Performance awards
23

 
22

 
34

Stock options
—

 
—

 
2

Pretax stock-based compensation cost
$
61

 
$
61

 
$
85

Tax benefit associated with stock-based compensation expense
$
23

 
$
23

 
$
33

Stock-based compensation costs capitalized
3

 
4

 
3
Schedule of Share-based Compensation, Stock Options, Activity
The following table summarizes information about stock options outstanding.
 
 
 
Weighted Average

 
 
 
Stock Options

 
Exercise Price

 
Weighted Average
  
(in thousands)

 
(per share)

 
Remaining Life
Outstanding at December 31, 2014
373

 
$
64

 
  
Exercised  
(270
)
 
62

 
  
Outstanding at December 31, 2015(a)
103

 
69

 
7 years, 2 months

(a)    Outstanding stock options all vested on January 1, 2016.
Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Exercises
The following table summarizes additional information related to stock options exercised and granted.
  
Years Ended December 31,
 
2015

 
2014

 
2013

Intrinsic value of options exercised (in millions)
$
5

 
$
6

 
$
26

Tax benefit related to options exercised (in millions)
2

 
2

 
10

Cash received from options exercised (in millions)
17

 
25

 
9

Stock options granted (in thousands)(a)
—

 
—

 
310


(a)    Stock options granted in 2013 were expensed immediately.
Schedule of Share-based Compensation, Restricted Stock Units Award Activity
The following table includes information related to restricted stock unit awards.
  
Years Ended December 31,
  
2015

 
2014

 
2013

Shares awarded (in thousands)  
524

 
557

 
612

Fair value (in millions)
$
41

 
$
40

 
$
42


The following table summarizes information about restricted stock unit awards outstanding.
 
 
 
Weighted Average

 
Shares

 
Grant Date Fair Value

  
(in thousands)

 
(per share)

Outstanding at December 31, 2014
1,080

 
$
69

Granted
524

 
79

Vested
(602
)
 
68

Forfeited
(49
)
 
73

Outstanding at December 31, 2015
953

 
75

Restricted stock unit awards expected to vest
924

 
75
Schedule of Performance Awards
The following table includes information related to stock-based performance awards.
  
Years Ended December 31,
  
2015

 
2014

 
2013

Shares awarded (in thousands)
642

 
542

 
633

Fair value (in millions)
$
26

 
$
19

 
$
28
Schedule of Nonvested Performance-based Units Activity
The following table summarizes information about stock-based performance awards outstanding and assumes payout at the maximum level.
 
 
 
Weighted Average

 
Shares

 
Grant Date Fair Value

  
(in thousands)

 
(per share)

Outstanding at December 31, 2014
1,627

 
$
42

Granted
642

 
41

Vested
(271
)
 
51

Forfeited
(301
)
 
38

Outstanding at December 31, 2015
1,697

 
40

Stock-based performance awards expected to vest
1,301

 
40