In 2017, Devon’s stockholders approved the 2017 Plan. Subject to the terms of the 2017 Plan, awards may be made for a total of 33.5 million shares of Devon common stock, plus the number of shares available for issuance under the 2015 Plan (including shares subject to outstanding awards that were transferred to the 2017 Plan in accordance with its terms). The 2017 Plan authorizes the Compensation Committee, which consists of independent, non-management members of Devon’s Board of Directors, to grant nonqualified and incentive stock options, restricted stock awards or units, performance units and stock appreciation rights to eligible employees. The 2017 Plan also authorizes the grant of nonqualified stock options, restricted stock awards or units and stock appreciation rights to non-employee directors. To calculate the number of shares that may be granted in awards under the 2017 Plan, options and stock appreciation rights represent one share and other awards represent 2.3 shares.

The vesting for certain share-based awards was accelerated in 2020, 2019 and 2018 in conjunction with the reduction of workforce activities described in Note 6 and is included in restructuring and transaction costs in the accompanying consolidated statements of comprehensive earnings.

The table below presents the share-based compensation expense included in Devon’s accompanying consolidated statements of comprehensive earnings.

	Year Ended December 31,
	2020		2019		2018
G&A	$	76	$	83	$	104
Exploration expenses		1		1		2
Restructuring and transaction costs		11		31		31
Total	$	88	$	115	$	137
Related income tax benefit	$	—	$	13	$	17

The following table presents a summary of Devon’s unvested restricted stock awards, performance-based restricted stock awards and performance share units granted under the plans.

						Performance-Based					Performance
	Restricted Stock Awards					Restricted Stock Awards					Share Units
	Awards			Weighted Average Grant-Date Fair Value		Awards			Weighted Average Grant-Date Fair Value		Units					Weighted Average Grant-Date Fair Value
	(Thousands, except fair value data)
Unvested at 12/31/19		4,984		$	29.65		153		$	33.88		2,155				$	40.35
Granted		3,056		$	21.90		—		$	—		688				$	27.89
Vested		(2,388	)	$	28.96		(109	)	$	29.51		(455	)			$	52.56
Forfeited		(336	)	$	24.52		—		$	—		(394	)			$	47.30
Unvested at 12/31/20		5,316		$	25.82		44		$	44.70		1,994		⁽¹	⁾	$	31.89

The following table presents the aggregate fair value of awards and units that vested during the indicated period.

	2020		2019		2018
Restricted Stock Awards and Units	$	44	$	127	$	111
Performance-Based Restricted Stock Awards	$	2	$	4	$	10
Performance Share Units	$	10	$	4	$	20

The following table presents the unrecognized compensation cost and the related weighted average recognition period associated with unvested awards and units as of December 31, 2020.

			Performance-Based
	Restricted Stock		Restricted Stock		Performance
	Awards		Awards		Share Units
Unrecognized compensation cost	$	70	$	—	$	10
Weighted average period for recognition (years)		2.4		0.4		1.7

Restricted stock awards are subject to the terms, conditions, restrictions and limitations, if any, that the Compensation Committee deems appropriate, including restrictions on continued employment. Generally, the

service requirement for vesting ranges from one to four years. Dividends declared during the vesting period with respect to restricted stock awards will not be paid until the underlying award vests. Devon estimates the fair values of restricted stock awards as the closing price of Devon’s common stock on the grant date of the award, which is expensed over the applicable vesting period.

Performance-based restricted stock awards were granted to certain members of Devon’s senior management. Vesting of the awards is dependent on Devon meeting certain internal performance targets and the recipient meeting certain service requirements. Generally, the service requirement for vesting ranges from one to four years. In order for awards to vest, the performance target must be met in the first year. If the performance target is met, the recipient is entitled to dividends under the same terms described above for nonperformance-based restricted stock. If the performance target and service period requirements are not met, the award does not vest. Devon estimates the fair values of the awards as the closing price of Devon’s common stock on the grant date of the award, which is expensed over the applicable vesting period. No performance-based restricted stock awards were granted in 2020, 2019 and 2018.

Performance share units are granted to certain members of Devon’s management and employees. Each unit that vests entitles the recipient to one share of Devon common stock. The vesting of these units is based on comparing Devon’s TSR to the TSR of a predetermined group of peer companies over the specified three-year performance period. The vesting of units may be between zero and 200% of the units granted depending on Devon’s TSR as compared to the peer group on the vesting date.

At the end of the vesting period, recipients receive dividend equivalents with respect to the number of units vested. The fair value of each performance share unit is estimated as of the date of grant using a Monte Carlo simulation with the following assumptions used for all grants made under the plan: (i) a risk-free interest rate based on U.S. Treasury rates as of the grant date; (ii) a volatility assumption based on the historical realized price volatility of Devon and the designated peer group; and (iii) an estimated ranking of Devon among the designated peer group. The fair value of the unit on the date of grant is expensed over the applicable vesting period. The following table presents the assumptions related to performance share units granted.

	2020			2019					2018
Grant-date fair value		$	27.89	$	28.43	—	$	29.53	$	36.23	—	$	37.88
Risk-free interest rate	1.36%			2.48%					2.28%
Volatility factor	38.4%			39.1%					45.8%
Contractual term (years)	2.89			2.89					2.89