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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 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 |  | Six Months Ended
| June 30, |  | June 30,
(in millions) | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Restricted stock unit awards | $ | 12 |  |  | $ | 12 |  |  | $ | 22 |  |  | $ | 20 |
Performance awards | 7 |  |  | 6 |  |  | 14 |  |  | 13 |
Pretax stock-based compensation cost | $ | 19 |  |  | $ | 18 |  |  | $ | 36 |  |  | $ | 33 |
Stock-based compensation cost capitalized | $ | 1 |  |  | $ | — |  |  | $ | 2 |  |  | $ | 1 |
Stock-based compensation expense | $ | 18 |  |  | $ | 18 |  |  | $ | 34 |  |  | $ | 32 |
Tax benefit associated with stock-based compensation expense | $ | 4 |  |  | $ | 7 |  |  | $ | 8 |  |  | $ | 12 |

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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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