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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2018
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) | 2018 |  |  | 2017 |  |  | 2016 |
Duke Energy | $ | 56 |  |  | $ | 43 |  |  | $ | 35 |
Duke Energy Carolinas | 20 |  |  | 15 |  |  | 12 |
Progress Energy | 21 |  |  | 16 |  |  | 12 |
Duke Energy Progress | 13 |  |  | 10 |  |  | 7 |
Duke Energy Florida | 8 |  |  | 6 |  |  | 5 |
Duke Energy Ohio | 4 |  |  | 3 |  |  | 2 |
Duke Energy Indiana | 5 |  |  | 4 |  |  | 3 |
Piedmont(a) | 3 |  |  | 3 |  |  |
(a) | Piedmont's stock-based compensation costs were not material for the two months ended December 31, 2016. 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) | 2018 |  |  | 2017 |  |  | 2016 |
Restricted stock unit awards | $ | 43 |  |  | $ | 41 |  |  | $ | 36 |
Performance awards | 35 |  |  | 27 |  |  | 19 |
Pretax stock-based compensation cost | $ | 78 |  |  | $ | 68 |  |  | $ | 55 |
Stock-based compensation costs capitalized | 5 |  |  | 4 |  |  | 2 |
Stock-based compensation expense | $ | 73 |  |  | $ | 64 |  |  | $ | 53 |
Tax benefit associated with stock-based compensation expense | $ | 17 |  |  | $ | 25 |  |  | $ | 20 |
Schedule of Share-based Compensation, Restricted Stock Units Award Activity | The following table includes information related to RSU awards.
| Years Ended December 31,
| 2018 |  |  | 2017 |  |  | 2016 |
Shares awarded (in thousands) | 649 |  |  | 583 |  |  | 684 |
Fair value (in millions) | $ | 49 |  |  | $ | 47 |  |  | $ | 52 |
The following table summarizes information about RSU awards outstanding.
|  |  | Weighted Average |
| Shares |  |  | Grant Date Fair Value |
| (in thousands) |  |  | (per share) |
Outstanding at December 31, 2017 | 1,121 |  |  | $ | 78 |
Granted | 649 |  |  | 76 |
Vested | (545 | ) |  | 78 |
Forfeited | (72 | ) |  | 77 |
Outstanding at December 31, 2018 | 1,153 |  |  | 77 |
Restricted stock unit awards expected to vest | 1,101 |  |  | 77 |
Schedule of Performance Awards | The following table includes information related to stock-based performance awards.
| Years Ended December 31,
| 2018 |  |  | 2017 |  |  | 2016 |
Shares granted assuming target performance (in thousands) | 372 |  |  | 461 |  |  | 338 |
Fair value (in millions) | $ | 27 |  |  | $ | 37 |  |  | $ | 25 |
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, 2017 | 1,065 |  |  | $ | 79 |
Granted | 372 |  |  | 73 |
Vested | (155 | ) |  | 81 |
Forfeited | (165 | ) |  | 80 |
Outstanding at December 31, 2018 | 1,117 |  |  | 77 |
Stock-based performance awards expected to vest | 1,086 |  |  | 77 |
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.
(in millions) | Year Ended October 31, 2016
Pretax stock-based compensation cost | $ | 16 |
Tax benefit associated with stock-based compensation expense | 6 |
Net of tax stock-based compensation cost | $ | 10 |

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