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Equity-based compensation (Tables)
 12 Months Ended
Dec. 31, 2023
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 for the years ended December 31, 2023 and 2022:
 20232022
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 14,793 69.16331 5,627 60.96343 
Granted
Restricted awards1,627 72.30 118 1,453 76.61 111 
Performance awards698 72.06 50 518 74.48 39 
Vested(1,985)65.70 (130)(2,447)55.48 (136)
Forfeited(191)73.66 (14)(358)71.74 (26)
Unvested shares at December 314,942 71.82 355 4,793 69.16 331 
Summary of shares authorized
The below table summarizes the number of shares authorized under the plans as of December 31, 2023:
(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)    No grants under the Deferred Bonus Stock Plan were made in 2023, 2022 or 2021.