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Equity-based compensation (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-Based Payment Arrangements [Abstract] |
Disclosure of number and weighted average exercise prices of other equity instruments | The below table summarizes unvested share movements for all Alcon equity-based incentive plans through December 31, 2020 and 2019:
| 2020 |  | 2019
| Number of shares in thousands |  | Weighted average fair value at grant date in $ |  | Fair value at grant date in $ millions |  | Number of shares in thousands |  | Weighted average fair value at grant date in $ |  | Fair value at grant date in $ millions
Unvested shares at January 1/Replacement awards issued at Spin-off(1) | 4,742 |  |  | 51.20 |  | 243 |  |  | 4,222 |  |  | n/a |  | 212 |
Granted |  |  |  |  |  |  |  |  |  |  |
Restricted awards | 1,668 |  |  | 60.19 |  |  | 100 |  |  | 625 |  |  | 56.10 |  |  | 35 |
Performance awards | 457 |  |  | 62.03 |  |  | 28 |  |  | 117 |  |  | 58.00 |  |  | 7 |
Vested(1) | (1,149) |  |  | n/a |  | (58) |  |  | (108) |  |  | n/a |  | (5) |
Forfeited(1) | (301) |  |  | n/a |  | (16) |  |  | (114) |  |  | n/a |  | (6) |
Unvested shares at December 31 | 5,417 |  |  | 54.90 |  |  | 297 |  |  | 4,742 |  |  | 51.20 |  |  | 243 |
(1) Fair value of replacement awards granted at Spin-off and associated subsequent vesting and forfeitures based on estimated fair value per share at the time of Spin-off.
Summary of shares authorized | The below table summarizes the number of shares authorized under the plans as of December 31, 2020:
(thousands) | Authorized shares
Long-term Incentive Plan | 20,000 |
Deferred Bonus Stock Plan | 1,500 |
Swiss Employee Share Ownership Plan | 475 |
Other share savings plans | 275 |
Total | 22,250 |

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- Definition The disclosure of the number and weighted average exercise prices of other equity instruments (ie other than share options). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2020-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_45&doctype=Standard -URIDate 2020-01-01 + Details
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