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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
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)
2017

 
2016

 
2015

Duke Energy
$
43

 
$
35

 
$
38

Duke Energy Carolinas
15

 
12

 
14

Progress Energy
16

 
12

 
14

Duke Energy Progress
10

 
7

 
9

Duke Energy Florida
6

 
5

 
5

Duke Energy Ohio
3

 
2

 
2

Duke Energy Indiana
4

 
3

 
4

Piedmont(a)
3

 
 
 
 
(a)    See discussion below for information on Piedmont's pre-merger stock-based compensation plans.
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)
2017

 
2016

 
2015

Restricted stock unit awards
$
41

 
$
36

 
$
38

Performance awards
27

 
19

 
23

Pretax stock-based compensation cost
$
68

 
$
55

 
$
61

Tax benefit associated with stock-based compensation expense
$
25

 
$
20

 
$
23

Stock-based compensation costs capitalized
4

 
2

 
3
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,
 
2017

 
2016

 
2015

Shares awarded (in thousands)
583

 
684

 
524

Fair value (in millions)
$
47

 
$
52

 
$
41


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, 2016
1,139

 
$
76

Granted
583

 
80

Vested
(553
)
 
76

Forfeited
(48
)
 
78

Outstanding at December 31, 2017
1,121

 
78

Restricted stock unit awards expected to vest
1,094

 
78
Schedule of Performance Awards
The following table includes information related to stock-based performance awards.
 
Years Ended December 31,
 
2017

 
2016

 
2015

Shares granted assuming target performance (in thousands)
461

 
338

 
321

Fair value (in millions)
$
37

 
$
25

 
$
26
Schedule of Nonvested Performance-based Units Activity
The following table summarizes information about stock-based performance awards outstanding and assumes payout at the target level.
 
 
 
Weighted Average

 
Shares

 
Grant Date Fair Value

 
(in thousands)

 
(per share)

Outstanding at December 31, 2016
862

 
$
75

Granted
461

 
81

Forfeited
(258
)
 
69

Outstanding at December 31, 2017
1,065

 
79

Stock-based performance awards expected to vest
1,034

 
79
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,
(in millions)
2016

 
2015

Intrinsic value of options exercised
$
1

 
$
5

Tax benefit related to options exercised
—

 
2

Cash received from options exercised
7

 
17
Piedmont Natural Gas [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule Of Stock-Based Compensation Expense
Piedmont's stock-based compensation costs and the tax benefit associated with stock-based compensation expense are included in the following table. Piedmont's stock-based compensation costs were not material for the two months ended December 31, 2016.
 
Years Ended October 31,
(in millions)
2016

 
2015

Pretax stock-based compensation cost
$
16

 
$
14

Tax benefit associated with stock-based compensation expense
6

 
4

Net of tax stock-based compensation cost
$
10

 
$
10