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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 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 |  | Nine Months Ended
| September 30, |  | September 30,
(in millions) | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Restricted stock unit awards | $ | 10 |  |  | $ | 10 |  |  | $ | 32 |  |  | $ | 30 |
Performance awards | 13 |  |  | 7 |  |  | 27 |  |  | 20 |
Pretax stock-based compensation cost | $ | 23 |  |  | $ | 17 |  |  | $ | 59 |  |  | $ | 50 |
Stock-based compensation cost capitalized | $ | 1 |  |  | $ | 1 |  |  | $ | 3 |  |  | $ | 2 |
Stock-based compensation expense | $ | 22 |  |  | $ | 16 |  |  | $ | 56 |  |  | $ | 48 |
Tax benefit associated with stock-based compensation expense | $ | 5 |  |  | $ | 6 |  |  | $ | 13 |  |  | $ | 18 |

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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