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Employee benefits: variable compensation (Narrative) (Detail 1) - shares
shares in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Table]    
Share delivery obligations 178 175
Treasury shares available to satisfy share delivery obligations 119 149
Deferred Contingent Capital Plan    
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Table]    
Percentage of awards that GEB members forfeit for each year during the vesting period in which UBS does not achieve an adjusted profit before tax 20.00%  
UBS AG | Deferred Contingent Capital Plan    
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Table]    
Percentage of awards that GEB members forfeit for each year during the vesting period in which UBS does not achieve an adjusted profit before tax 20.00%