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Stock-Based Compensation | 6 Months Ended
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Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock-Based Compensation | STOCK-BASED COMPENSATION For employee awards, equity classified stock-based compensation cost is measured at the service inception date or the grant date, based on the estimated achievement of certain performance metrics or the fair value of the award, and is recognized as expense or capitalized as a component of property, plant and equipment over the requisite service period. 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 The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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- References No definition available. + Details
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