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Equity-based compensation (Tables)
 12 Months Ended
Dec. 31, 2022
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, 2022 and 2021:
 20222021
Number of
shares in
thousands		Weighted average
fair value at grant date in $		Fair value at grant date in $ millionsNumber of
shares in
thousands		Weighted average
fair value at grant date in $		Fair value at grant date in $ millions
Unvested shares at January 15,627 60.96343 5,417 54.90297 
Granted
Restricted awards1,453 76.61 111 1,456 72.05 105 
Performance awards518 74.48 39 429 72.71 31 
Vested(2,447)55.48 (136)(1,258)50.94 (64)
Forfeited(358)71.74 (26)(417)62.50 (26)
Unvested shares at December 314,793 69.16 331 5,627 60.96 343 
Summary of shares authorized
The below table summarizes the number of shares authorized under the plans as of December 31, 2022:
(thousands)Authorized shares
Long-term Incentive Plan20,000 
Deferred Bonus Stock Plan(1)
1,500 
Swiss Employee Share Ownership Plan475 
Other share savings plans275 
Total22,250 
(1)    Beginning in 2020, the annual incentives for the Alcon CEO and certain senior-level associates no longer include deferrals of compensation in the form of equity-based awards subject to the provisions of this plan. No grants were issued under this plan in 2022 and 2021.