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Right-of-use assets and Lease liabilities - Components of Right-of-Use Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
 [1],[2]
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets $ 324 [1],[2] $ 279 $ 79
Right-of-use assets, revaluation surplus   3  
Lease liability in excess of capital   10  
Land [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets 20 20  
Buildings [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets 277 226  
Machinery & equipment and other assets [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets $ 27 $ 33  
[1]
Alcon adopted IFRS 16, Leases as of January 1, 2019 using the modified retrospective approach as described in Notes 3 and 16 to these Consolidated Financial Statements. Under the modified retrospective approach, comparative information was not restated.
[2]
The December 31, 2018 balances previously reported for a finance lease liability and corresponding asset of $89 million and $79 million, respectively, have been reclassified from "Non-current financial debts" and "Property, Plant, & Equipment" to "Non-current lease liabilities" and "Right-of-use assets", respectively.