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Stock-Based Compensation | 9 Months Ended
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Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock-Based Compensation | STOCK-BASED COMPENSATION Stock-based compensation awarded to employees or outside directors is measured at the service inception date or grant date. The fair value of the award is expensed or capitalized over the requisite service period. For awards with performance conditions, the probability of vesting is assessed at each reporting period and compensation cost is adjusted based upon that assessment. 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 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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