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Employee benefits: variable compensation (Narrative) (Detail 2)
$ in Millions
Dec. 31, 2022
USD ($)
yr
Dec. 31, 2021
USD ($)
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Table]    
Carrying amount of liability related to cash-settled share-based awards | $ $ 43 $ 37
Unvested share-based awards    
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Table]    
Weighted average remaining contractual term (years) | yr 2.5  
UBS AG    
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Table]    
Carrying amount of liability related to cash-settled share-based awards | $ $ 7 $ 3
UBS AG | Unvested share-based awards    
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Table]    
Weighted average remaining contractual term (years) | yr 2.5