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Stock Incentive Plans | 12 Months Ended
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Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [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 2017 Long-Term Incentive Plan (LTIP) and prior to the 2017 LTIP, under our 2014 LTIP. The 2017 LTIP was approved by stockholders in June 2017 and replaced the 2014 LTIP. 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 GM 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, 2018 | 52.9 |  |  | $ | 21.75 |  |  | 2.0
Granted | 13.7 |  |  | $ | 30.41 |  |  |
Settled | (10.2 | ) |  | $ | 30.23 |  |  |
Forfeited or expired | (8.3 | ) |  | $ | 29.51 |  |  |
Units outstanding at December 31, 2018(a) | 48.1 |  |  | $ | 19.81 |  |  | 1.3
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(a) | Includes the target amount of PSUs.
Our weighted-average assumptions used to value our stock options are a dividend yield of 3.69% and 4.43%, expected volatility of 28.0% and 25.0%, a risk-free interest rate of 2.73% and 1.97%, and an expected option life of 5.98 and 5.84 years for options issued during the years ended December 31, 2018 and 2017. There were no stock options issued during the year ended December 31, 2016. Total compensation expense related to the above awards was $316 million, $585 million and $627 million in the years ended December 31, 2018, 2017 and 2016. At December 31, 2018 the total unrecognized compensation expense for nonvested equity awards granted was $208 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 $317 million, $421 million and $325 million in the years ended December 31, 2018, 2017 and 2016. GM Cruise Stock Incentive Awards In addition to the awards noted above, stock options and RSUs were granted to GM Cruise employees in common shares of GM Cruise Holdings in the year ended December 31, 2018. These awards were granted under the 2018 Employee Incentive Plan approved by GM 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. There were no awards granted in GM Cruise common shares for the years ended December 31, 2017 and December 31, 2016. 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 GM Cruise Holdings’ share-based awards was insignificant for the year ended December 31, 2018. As of December 31, 2018, no share-based compensation expense had been recognized for the RSUs because the liquidity condition described above was not met. Total unrecognized compensation expense for GM Cruise Holdings’ nonvested equity awards granted was $392 million at December 31, 2018, which included the RSUs for which the liquidity condition had not been met. The expense related to stock options is expected to be recorded over a weighted-average period of 8.5 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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- 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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