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Stock-Based Compensation | 3 Months Ended
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Mar. 31, 2020
Share-based Payment Arrangement [Abstract] |
Stock-Based Compensation | STOCK-BASED COMPENSATION Our 2014 Long Term Stock Incentive Plan provides for the issuance of stock-based incentives in various forms to our employees and non-employee Directors. At March 31, 2020, outstanding stock-based incentives were in the form of long-term stock awards, stock options, restricted stock units, performance restricted stock units, and phantom stock awards. Pre-tax compensation expense included in income from continuing operations for these stock-based incentives was as follows, in millions:
| Three Months Ended March 31,
| 2020 |  | 2019
Long-term stock awards | $ | 4 |  |  | $ | 5 |
Stock options | 3 |  |  | 1 |
Restricted stock units | 8 |  |  | — |
Performance restricted stock units | 1 |  |  | 1 |
Phantom stock awards and stock appreciation rights | — |  |  | 1 |
Total | $ | 16 |  |  | $ | 8 |
Long-Term Stock Awards. Prior to the amendment of our 2014 Long Term Stock Incentive Plan in December 2019, we granted long-term stock awards to our key employees and non-employee Directors. These grants did not cause net share dilution due to our practice of repurchasing and retiring an equal number of shares in the open market. We did not grant shares of long-term stock awards in the three-month period ended March 31, 2020. Our long-term stock award activity was as follows, shares in millions:
| Three Months Ended March 31,
| 2020 |  | 2019
Unvested stock award shares at January 1 | 2 |  |  | 2 |
Weighted average grant date fair value | $ | 34 |  |  | $ | 30 |
Stock award shares granted | — |  |  | 1 |
Weighted average grant date fair value | $ | — |  |  | $ | 36 |
Stock award shares vested | 1 |  |  | 1 |
Weighted average grant date fair value | $ | 32 |  |  | $ | 24 |
Stock award shares forfeited | — |  |  | — |
Weighted average grant date fair value | $ | 35 |  |  | $ | 29 |
Unvested stock award shares at March 31 | 1 |  |  | 2 |
Weighted average grant date fair value | $ | 36 |  |  | $ | 34 |
At March 31, 2020 and 2019, there was $32 million and $61 million, respectively, of total unrecognized compensation expense related to unvested stock awards; such awards had a weighted average remaining vesting period of three years and four years at March 31, 2020 and 2019, respectively. The total market value (at the vesting date) of stock award shares which vested was $29 million during each of the three-month periods ended March 31, 2020 and 2019. J. STOCK-BASED COMPENSATION (Continued) Stock Options. Stock options are granted to certain key employees. The exercise price equals the market price of our common stock at the grant date. These options become exercisable (vest ratably) over five years beginning on the first anniversary from the date of grant. Beginning in 2020, stock options become exercisable (vest ratably) over three years. We granted 420,840 stock options in the three-month period ended March 31, 2020 with a grant date weighted average exercise price of approximately $48 per share. In the three-month period ended March 31, 2020, 16,240 stock options were forfeited (including options that expired unexercised). Our stock option activity was as follows, shares in millions:
|  | Three Months Ended March 31,
|  | 2020 |  |  | 2019
Option shares outstanding, January 1 |  | 3 |  |  |  | 4 |
Weighted average exercise price | $ | 27 |  |  | $ | 21 |
Option shares granted |  | 1 |  |  |  | 1 |
Weighted average exercise price | $ | 48 |  |  | $ | 36 |
Option shares exercised |  | 1 |  |  |  | 1 |
Aggregate intrinsic value on date of exercise (A) | $ | 22 million |  |  | $ | 13 million |
Weighted average exercise price | $ | 17 |  |  | $ | 11 |
Option shares forfeited |  | — |  |  |  | — |
Weighted average exercise price | $ | 42 |  |  | $ | — |
Option shares outstanding, March 31 |  | 3 |  |  |  | 4 |
Weighted average exercise price | $ | 32 |  |  | $ | 25 |
Weighted average remaining option term (in years) |  | 7 |  |  |  | 6 |
Option shares vested and expected to vest, March 31 |  | 3 |  |  |  | 4 |
Weighted average exercise price | $ | 32 |  |  | $ | 25 |
Aggregate intrinsic value (A) | $ | 14 million |  |  | $ | 57 million |
Weighted average remaining option term (in years) |  | 7 |  |  |  | 6 |
Option shares exercisable (vested), March 31 |  | 1 |  |  |  | 2 |
Weighted average exercise price | $ | 26 |  |  | $ | 19 |
Aggregate intrinsic value (A) | $ | 13 million |  |  | $ | 50 million |
Weighted average remaining option term (in years) |  | 6 |  |  |  | 4 |
(A) | Aggregate intrinsic value is calculated using our stock price at each respective date, less the exercise price (grant date price), multiplied by the number of shares.
At March 31, 2020 and 2019, there was $9 million and $12 million, respectively, of unrecognized compensation expense (using the Black-Scholes option pricing model at the grant date) related to unvested stock options; such options had a weighted average remaining vesting period of three years and four years at March 31, 2020 and 2019, respectively. J. STOCK-BASED COMPENSATION (Concluded) The weighted average grant date fair value of option shares granted and the assumptions used to estimate those values using a Black-Scholes option pricing model were as follows:
| Three Months Ended March 31,
| 2020 |  | 2019
Weighted average grant date fair value | $ | 10.67 |  |  | $ | 8.81 |
Risk-free interest rate | 1.53 | % |  | 2.57 | %
Dividend yield | 1.14 | % |  | 1.35 | %
Volatility factor | 24.00 | % |  | 25.00 | %
Expected option life | 6 years |  |  | 6 years |
Restricted Stock Units. Restricted stock units are granted to our key employees and non-employee Directors. These grants did not cause net share dilution due to our practice of repurchasing and retiring an equal number of shares in the open market. The grant date fair value is based on the fair value of our common stock. These units will vest and be settled in shares ratably over three years. We granted 394,970 restricted stock units in the three-month period ended March 31, 2020 with a weighted average grant date fair value of $47 per share. In the three-month period ended March 31, 2020, 4,760 restricted stock units were forfeited. At March 31, 2020, there was $10 million of unrecognized compensation expense related to unvested restricted stock units; such units had a weighted average remaining vesting period of three years. Performance Restricted Stock Units. Under our Long Term Incentive Program, we grant performance restricted stock units to certain senior executives. These performance restricted stock units will vest and share awards will be issued at no cost to the employees, subject to our achievement of specified performance metrics established by our Compensation Committee over a three-year performance period and the recipient's continued employment through the share award date. During the three-month period ended March 31, 2020, we granted 133,390 performance restricted stock units with a grant date fair value of approximately $34 per share and 151,724 shares were issued. During the three-month period ended March 31, 2019, we granted 126,680 performance restricted stock units with a grant date fair value of approximately $39 per share. No performance restricted stock units were forfeited in either period.

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