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Stock Incentive Plans | 12 Months Ended
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Dec. 31, 2020
Share-based Payment Arrangement [Abstract] |
Stock Incentive Plans | Stock Incentive Plans GM Stock Incentive Awards We grant to certain employees RSUs, RSAs, PSUs and stock options (collectively, stock incentive awards) under our 2016 Equity Incentive Plan and 2020 Long-Term Incentive Plan (LTIP) and prior to the 2020 LTIP, under our 2017 and 2014 LTIP. The 2020 LTIP was approved by stockholders in June 2020. Any new awards granted after the approval of the 2020 LTIP in June 2020 will be issued under the 2020 LTIP. To the extent any shares remain available for issuance under the 2017 LTIP, the 2016 Equity Incentive Plan, and/or the 2014 LTIP, such shares will only be used to settle outstanding awards that were previously granted under such plans prior to June 2020. Shares awarded under the plans are subject to forfeiture if the participant leaves the company for reasons other than those permitted under the plans such as retirement, death or disability. RSU awards granted either cliff vest or ratably vest generally over a three-year service period, as defined in the terms of each award. PSU awards vest at the end of a three-year performance period, based on performance criteria determined by the Executive Compensation Committee of the Board of Directors at the time of award. The number of shares earned may equal, exceed or be less than the targeted number of shares depending on whether the performance criteria are met, surpassed or not met. Stock options expire 10 years from the grant date. Our performance-based stock options vest ratably over 55 months based on the performance of our common stock relative to that of a specified peer group. Our service-based stock options vest ratably over 19 months to three years. In connection with our acquisition of Cruise Automation, Inc. in May 2016, RSAs and PSUs in common shares of GM were granted to employees of Cruise Holdings. The RSAs vest ratably, generally over a three-year service period. The PSUs are contingent upon achievement of specific technology and commercialization milestones.
| Shares (in millions) |  | Weighted-Average Grant Date Fair Value |  | Weighted-Average Remaining Contractual Term in Years
Units outstanding at January 1, 2020 | 41.5 |  |  | $ | 19.17 |  |  | 0.9
Granted | 13.3 |  |  | $ | 22.50 |  |  |
Settled | (13.5) |  |  | $ | 19.31 |  |  |
Forfeited or expired | (2.7) |  |  | $ | 27.23 |  |  |
Units outstanding at December 31, 2020(a) | 38.6 |  |  | $ | 19.84 |  |  | 0.9
__________ (a) Includes the target amount of PSUs. Our weighted-average assumptions used to value our stock options are a dividend yield of 4.25%, 3.90% and 3.69%, expected volatility of 26.2%, 28.0% and 28.0%, a risk-free interest rate of 1.44%, 2.62% and 2.73%, and an expected option life of 5.97, 6.00 and 5.98 years for options issued during the years ended December 31, 2020, 2019 and 2018. The expected volatility is based on the average of the implied volatility of publicly traded options for our common stock. Total compensation expense related to the above awards was $351 million, $456 million and $316 million in the years ended December 31, 2020, 2019 and 2018. At December 31, 2020, the total unrecognized compensation expense for nonvested equity awards granted was $213 million. This expense is expected to be recorded over a weighted-average period of 1.3 years. The total fair value of stock incentive awards vested was $275 million, $287 million and $317 million in the years ended December 31, 2020, 2019 and 2018. Cruise Stock Incentive Awards In addition to the awards noted above, RSUs were granted to Cruise employees in common shares of Cruise Holdings in the years ended December 31, 2020, 2019 and 2018. Stock options were granted in common shares of Cruise Holdings in the years ended December 31, 2019 and 2018. There were no Cruise stock options granted in the year ended December 31, 2020. These awards were granted under the 2018 Employee Incentive Plan approved by Cruise Holdings' Board of Directors in August 2018. Shares awarded under the plan are subject to forfeiture if the participant leaves the company for reasons other than those permitted under the plan. Stock options vest ratably over four to 10 years, as defined in the terms of each award. Stock options expire 10 years from the grant date. RSU awards granted vest upon the satisfaction of both a service condition and a liquidity condition. The service condition for the majority of these awards is satisfied over four years. The liquidity condition is satisfied upon the earlier of the date of a change in control transaction or the consummation of an initial public offering. Total compensation expense related to Cruise Holdings’ share-based awards was insignificant for the years ended December 31, 2020, 2019 and 2018. No share-based compensation expense had been recognized for the RSUs because the liquidity condition described above was not met at December 31, 2020, 2019 and 2018. Total unrecognized compensation expense for Cruise Holdings’ nonvested equity awards granted was $863 million at December 31, 2020, which was primarily comprised of the RSUs for which the liquidity condition had not been met. Total units outstanding were 79.3 million at December 31, 2020. The expense related to stock options is expected to be recorded over a weighted-average period of 7.1 years. The timing of the expense related to RSUs will depend upon the date of the satisfaction of the liquidity condition.

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