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Stock-Based Compensation | 12 Months Ended
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Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock-Based Compensation | Stock-Based Compensation Pinnacle West has incentive compensation plans under which stock-based compensation is granted to officers, key-employees, and non-officer members of the Board of Directors. Awards granted under the 2012 Long-Term Incentive Plan (“2012 Plan”) may be in the form of stock grants, restricted stock units, stock units, performance shares, restricted stock, dividend equivalents, performance share units, performance cash, incentive and non-qualified stock options, and stock appreciation rights. The 2012 Plan authorizes up to 4.6 million common shares to be available for grant. As of December 31, 2018, 1.9 million common shares were available for issuance under the 2012 Plan. During 2018, 2017, and 2016, the Company granted awards in the form of restricted stock units, stock units, stock grants, and performance shares. Awards granted from 2007 to 2011 were issued under the 2007 Long-Term Incentive Plan (“2007 Plan”), and no new awards may be granted under the 2007 Plan. Stock-Based Compensation Expense and Activity Compensation cost included in net income for stock-based compensation plans was $20 million in 2018, $21 million in 2017, and $19 million in 2016. The compensation cost capitalized is immaterial for all years. Income tax benefits related to stock-based compensation arrangements were $7 million in 2018, $15 million in 2017, and $10 million in 2016. As of December 31, 2018, there were approximately $9 million of unrecognized compensation costs related to nonvested stock-based compensation arrangements. We expect to recognize these costs over a weighted-average period of 2 years. The total fair value of shares vested was $24 million in 2018, $22 million in 2017 and $22 million in 2016. The following table is a summary of awards granted and the weighted-average grant date fair value for the three years ended 2018, 2017 and 2016:
| Restricted Stock Units, Stock Grants, and Stock Units (a) |  | Performance Shares (b)
| 2018 |  | 2017 |  | 2016 |  | 2018 |  | 2017 |  | 2016
Units granted | 132,997 |  |  | 161,963 |  |  | 141,811 |  |  | 171,708 |  |  | 147,706 |  |  | 166,666 |
Weighted-average grant date fair value | $ | 77.51 |  |  | $ | 72.60 |  |  | $ | 67.34 |  |  | $ | 76.56 |  |  | $ | 78.99 |  |  | $ | 66.60 |
(a) | Units granted includes awards that will be cash settled of 66,252 in 2018, 67,599 in 2017, and 43,952 in 2016.
(b) | Reflects the target payout level.
The following table is a summary of the status of non-vested awards as of December 31, 2018 and changes during the year:
| Restricted Stock Units, Stock Grants, and Stock Units |  | Performance Shares
| Shares |  | Weighted-Average Grant Date Fair Value |  | Shares (b) |  | Weighted-Average Grant Date Fair Value
Nonvested at January 1, 2018 | 291,288 |  |  | $ | 69.78 |  |  | 309,502 |  |  | $ | 72.46 |
Granted | 132,997 |  |  | 77.51 |  |  | 171,708 |  |  | 76.56 |
Vested | (147,938 | ) |  | 67.12 |  |  | (159,284 | ) |  | 66.61 |
Forfeited (c) | (5,356 | ) |  | 73.42 |  |  | (9,542 | ) |  | 73.34 |
Nonvested at December 31, 2018 | 270,991 |  | (a) | 74.39 |  |  | 312,384 |  |  | 77.67 |
Vested Awards Outstanding at December 31, 2018 | 73,144 |  |  |  |  |  | 159,284 |  |  |  |
(a) | Includes 148,131 of awards that will be cash settled.
(b) | The nonvested performance shares are reflected at target payout level.
(c) | We account for forfeitures as they occur.
Share-based liabilities paid relating to restricted stock units were $4 million, $4 million and $3 million in 2018, 2017 and 2016, respectively. This includes cash used to settle restricted stock units of $5 million, $4 million and $3 million in 2018, 2017 and 2016, respectively. Restricted stock units that are cash settled are classified as liability awards. All performance shares are classified as equity awards. Restricted Stock Units, Stock Grants, and Stock Units Restricted stock units are granted to officers and key employees. Restricted stock units typically vest and settle in equal annual installments over a 4-year period after the grant date. Vesting is typically dependent upon continuous service during the vesting period; however, awards granted to retirement-eligible employees will vest upon the employee's retirement. Awardees elect to receive payment in either 100% stock, 100% cash, or 50% in cash and 50% in stock. Restricted stock unit awards typically include a dividend equivalent feature. This feature allows each award to accrue dividend rights equal to the dividends they would have received had they directly owned the stock. Interest on dividend rights compounds quarterly. If the award is forfeited the employee is not entitled to the dividends on those shares. In December 2012, the Company granted a retention award of 50,617 performance-linked restricted stock units to the Chairman of the Board and Chief Executive Officer of Pinnacle West. This award vested on December 31, 2016, because he remained employed with the Company through that date. The Board did increase the number of awards that vested by 33,745 restricted stock units, payable in stock because certain performance requirements were met. In February 2017, 84,362 restricted stock units were released. Compensation cost for restricted stock unit awards is based on the fair value of the award, with the fair value being the market price of our stock on the measurement date. Restricted stock unit awards that will be settled in cash are accounted for as liability awards, with compensation cost initially calculated on the date of grant using the Company’s closing stock price, and remeasured at each balance sheet date. Restricted stock unit awards that will be settled in shares are accounted for as equity awards, with compensation cost calculated using the Company's closing stock price on the date of grant. Compensation cost is recognized over the requisite service period based on the fair value of the award. Stock grants are issued to non-officer members of the Board of Directors. They may elect to receive the stock grant, or to defer receipt until a later date and receive stock units in lieu of the stock grant. The members of the Board of Directors who elect to defer may elect to receive payment in either 100% stock, 100% cash, or 50% in cash and 50% in stock. Each stock unit is convertible to one share of stock. The stock units accrue dividend rights, equal to the amount of dividends the Directors would have received had they directly owned stock equal to the number of vested restricted stock units or stock units from the date of grant to the date of payment, plus interest compounded quarterly. The dividends and interest are paid, based on the Director’s election, in either stock, cash, or 50% in cash and 50% in stock. Performance Share Awards Performance share awards are granted to officers and key employees. The awards contain two separate performance criteria that affect the number of shares that may be received if after the end of a 3-year performance period the performance criteria are met. For the first criteria, the number of shares that will vest is based on non-financial performance metrics (i.e., the metric component). The other criteria is based upon Pinnacle West's total shareholder return ("TSR") in relation to the TSR of other companies in a specified utility index (i.e., the TSR component). The exact number of shares issued will vary from 0% to 200% of the target award. Shares received include dividend rights paid in stock equal to the amount of dividends that recipients would have received had they directly owned stock, equal to the number of vested performance shares from the date of grant to the date of payment plus interest compounded quarterly. If the award is forfeited or if the performance criteria are not achieved, the employee is not entitled to the dividends on those shares. Performance share awards are accounted for as equity awards, with compensation cost based on the fair value of the award on the grant date. Compensation cost relating to the metric component of the award is based on the Company’s closing stock price on the date of grant, with compensation cost recognized over the requisite service period based on the number of shares expected to vest. Management evaluates the probability of meeting the metric component at each balance sheet date. If the metric component criteria are not ultimately achieved, no compensation cost is recognized relating to the metric component, and any previously recognized compensation cost is reversed. Compensation cost relating to the TSR component of the award is determined using a Monte Carlo simulation valuation model, with compensation cost recognized ratably over the requisite service period, regardless of the number of shares that actually vest.

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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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