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Expected credit loss measurement - Development of ECL allowances and provisions (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure Of Credit Risk Exposure [Table]      
Total ECL allowances and provisions $ (1,091) $ (1,165) $ (1,468)
ECL movement with profit or loss impact      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (29) 148  
Net movement from new and derecognized transactions      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (7) (59)  
Net movement from new and derecognized transactions | Private clients with mortgages      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (6) (7)  
Net movement from new and derecognized transactions | Real estate financing      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (3) (7)  
Net movement from new and derecognized transactions | Large corporate clients      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 8 (13)  
Net movement from new and derecognized transactions | SME clients      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (1) (8)  
Net movement from new and derecognized transactions | Other      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (6) (24)  
Net movement from new and derecognized transactions | Loans to financial advisors      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 0 0  
Net movement from new and derecognized transactions | Financial intermediaries and hedge funds      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 0 (21)  
Remeasurements with stage transfers      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (65) (40)  
Remeasurements with stage transfers | Private clients with mortgages      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (10) (9)  
Remeasurements with stage transfers | Real estate financing      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 7 (3)  
Remeasurements with stage transfers | Large corporate clients      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (33) 2  
Remeasurements with stage transfers | SME clients      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (23) (27)  
Remeasurements with stage transfers | Other      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (6) (3)  
Remeasurements with stage transfers | Loans to financial advisors      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 1 0  
Remeasurements with stage transfers | Financial intermediaries and hedge funds      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 0 2  
Remeasurements without stage transfers      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 13 203  
Remeasurements without stage transfers | Private clients with mortgages      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (12) 33  
Remeasurements without stage transfers | Real estate financing      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 13 30  
Remeasurements without stage transfers | Large corporate clients      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 32 44  
Remeasurements without stage transfers | SME clients      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (6) 53  
Remeasurements without stage transfers | Other      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (15) 44  
Remeasurements without stage transfers | Loans to financial advisors      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (3) 6  
Remeasurements without stage transfers | Financial intermediaries and hedge funds      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (8) 27  
Model changes      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 30 45  
Movements without profit or loss impact (write-off, FX and other)      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 104 154  
Positions that are not credit impaired | ECL movement with profit or loss impact      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (29)    
Positions that are not credit impaired | Remeasurements without stage transfers      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (35)    
Positions that are not credit impaired | Remeasurements without stage transfers | Large and SME corporate lending      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (28)    
Positions that are not credit impaired | Remeasurements without stage transfers | Financial intermediaries and hedge funds      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (8)    
Twelve-month expected credit losses | Positions that are not credit impaired      
Disclosure Of Credit Risk Exposure [Table]      
Total ECL allowances and provisions (259) (282) (306)
Twelve-month expected credit losses | Positions that are not credit impaired | ECL movement with profit or loss impact      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 20 19  
Twelve-month expected credit losses | Positions that are not credit impaired | Net movement from new and derecognized transactions      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (21) (72)  
Twelve-month expected credit losses | Positions that are not credit impaired | Net movement from new and derecognized transactions | Private clients with mortgages      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (6) (10)  
Twelve-month expected credit losses | Positions that are not credit impaired | Net movement from new and derecognized transactions | Real estate financing      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (5) (11)  
Twelve-month expected credit losses | Positions that are not credit impaired | Net movement from new and derecognized transactions | Large corporate clients      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (1) (21)  
Twelve-month expected credit losses | Positions that are not credit impaired | Net movement from new and derecognized transactions | SME clients      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (1) (8)  
Twelve-month expected credit losses | Positions that are not credit impaired | Net movement from new and derecognized transactions | Other      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (8) (23)  
Twelve-month expected credit losses | Positions that are not credit impaired | Net movement from new and derecognized transactions | Loans to financial advisors      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 0 (1)  
Twelve-month expected credit losses | Positions that are not credit impaired | Net movement from new and derecognized transactions | Financial intermediaries and hedge funds      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (2) (18)  
Twelve-month expected credit losses | Positions that are not credit impaired | Remeasurements with stage transfers      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 20 8  
Twelve-month expected credit losses | Positions that are not credit impaired | Remeasurements with stage transfers | Private clients with mortgages      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 3 4  
Twelve-month expected credit losses | Positions that are not credit impaired | Remeasurements with stage transfers | Real estate financing      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (1) 1  
Twelve-month expected credit losses | Positions that are not credit impaired | Remeasurements with stage transfers | Large corporate clients      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 16 (2)  
Twelve-month expected credit losses | Positions that are not credit impaired | Remeasurements with stage transfers | SME clients      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 2 5  
Twelve-month expected credit losses | Positions that are not credit impaired | Remeasurements with stage transfers | Other      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 1 0  
Twelve-month expected credit losses | Positions that are not credit impaired | Remeasurements with stage transfers | Loans to financial advisors      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 2 1  
Twelve-month expected credit losses | Positions that are not credit impaired | Remeasurements with stage transfers | Financial intermediaries and hedge funds      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 0 (1)  
Twelve-month expected credit losses | Positions that are not credit impaired | Remeasurements without stage transfers      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (8) 55  
Twelve-month expected credit losses | Positions that are not credit impaired | Remeasurements without stage transfers | Private clients with mortgages      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 5 8  
Twelve-month expected credit losses | Positions that are not credit impaired | Remeasurements without stage transfers | Real estate financing      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 3 13  
Twelve-month expected credit losses | Positions that are not credit impaired | Remeasurements without stage transfers | Large corporate clients      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (11) 5  
Twelve-month expected credit losses | Positions that are not credit impaired | Remeasurements without stage transfers | SME clients      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (10) (1)  
Twelve-month expected credit losses | Positions that are not credit impaired | Remeasurements without stage transfers | Other      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 5 29  
Twelve-month expected credit losses | Positions that are not credit impaired | Remeasurements without stage transfers | Loans to financial advisors      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 3 8  
Twelve-month expected credit losses | Positions that are not credit impaired | Remeasurements without stage transfers | Financial intermediaries and hedge funds      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 0 15  
Twelve-month expected credit losses | Positions that are not credit impaired | Model changes      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 29 29  
Twelve-month expected credit losses | Positions that are not credit impaired | Movements without profit or loss impact (write-off, FX and other)      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 3 5  
Lifetime expected credit losses | Positions that are not credit impaired      
Disclosure Of Credit Risk Exposure [Table]      
Total ECL allowances and provisions (267) (220) (333)
Lifetime expected credit losses | Positions that are not credit impaired | Private clients with mortgages      
Disclosure Of Credit Risk Exposure [Table]      
Total ECL allowances and provisions (107)    
Lifetime expected credit losses | Positions that are not credit impaired | Real estate financing      
Disclosure Of Credit Risk Exposure [Table]      
Total ECL allowances and provisions (23)    
Lifetime expected credit losses | Positions that are not credit impaired | Large corporate clients      
Disclosure Of Credit Risk Exposure [Table]      
Total ECL allowances and provisions (65)    
Lifetime expected credit losses | Positions that are not credit impaired | SME clients      
Disclosure Of Credit Risk Exposure [Table]      
Total ECL allowances and provisions (37)    
Lifetime expected credit losses | Positions that are not credit impaired | Other      
Disclosure Of Credit Risk Exposure [Table]      
Total ECL allowances and provisions (5)    
Lifetime expected credit losses | Positions that are not credit impaired | Loans to financial advisors      
Disclosure Of Credit Risk Exposure [Table]      
Total ECL allowances and provisions (2)    
Lifetime expected credit losses | Positions that are not credit impaired | Credit cards      
Disclosure Of Credit Risk Exposure [Table]      
Total ECL allowances and provisions (12)    
Lifetime expected credit losses | Positions that are not credit impaired | ECL movement with profit or loss impact      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (49) 104  
Lifetime expected credit losses | Positions that are not credit impaired | Net movement from new and derecognized transactions      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 16 13  
Lifetime expected credit losses | Positions that are not credit impaired | Net movement from new and derecognized transactions | Private clients with mortgages      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 0 3  
Lifetime expected credit losses | Positions that are not credit impaired | Net movement from new and derecognized transactions | Real estate financing      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 2 4  
Lifetime expected credit losses | Positions that are not credit impaired | Net movement from new and derecognized transactions | Large corporate clients      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 11 7  
Lifetime expected credit losses | Positions that are not credit impaired | Net movement from new and derecognized transactions | SME clients      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 0 0  
Lifetime expected credit losses | Positions that are not credit impaired | Net movement from new and derecognized transactions | Other      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 3 (2)  
Lifetime expected credit losses | Positions that are not credit impaired | Net movement from new and derecognized transactions | Loans to financial advisors      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 0 1  
Lifetime expected credit losses | Positions that are not credit impaired | Net movement from new and derecognized transactions | Financial intermediaries and hedge funds      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 2 (4)  
Lifetime expected credit losses | Positions that are not credit impaired | Remeasurements with stage transfers      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (39) 0  
Lifetime expected credit losses | Positions that are not credit impaired | Remeasurements with stage transfers | Private clients with mortgages      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (12) (13)  
Lifetime expected credit losses | Positions that are not credit impaired | Remeasurements with stage transfers | Real estate financing      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 8 (4)  
Lifetime expected credit losses | Positions that are not credit impaired | Remeasurements with stage transfers | Large corporate clients      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (28) 12  
Lifetime expected credit losses | Positions that are not credit impaired | Remeasurements with stage transfers | SME clients      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (2) 4  
Lifetime expected credit losses | Positions that are not credit impaired | Remeasurements with stage transfers | Other      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (4) 2  
Lifetime expected credit losses | Positions that are not credit impaired | Remeasurements with stage transfers | Loans to financial advisors      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (1) (1)  
Lifetime expected credit losses | Positions that are not credit impaired | Remeasurements with stage transfers | Financial intermediaries and hedge funds      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 0 3  
Lifetime expected credit losses | Positions that are not credit impaired | Remeasurements without stage transfers      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (27) 74  
Lifetime expected credit losses | Positions that are not credit impaired | Remeasurements without stage transfers | Private clients with mortgages      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (18) 26  
Lifetime expected credit losses | Positions that are not credit impaired | Remeasurements without stage transfers | Real estate financing      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 10 13  
Lifetime expected credit losses | Positions that are not credit impaired | Remeasurements without stage transfers | Large corporate clients      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 2 21  
Lifetime expected credit losses | Positions that are not credit impaired | Remeasurements without stage transfers | SME clients      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (9) 1  
Lifetime expected credit losses | Positions that are not credit impaired | Remeasurements without stage transfers | Other      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (12) 14  
Lifetime expected credit losses | Positions that are not credit impaired | Remeasurements without stage transfers | Loans to financial advisors      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (1) 1  
Lifetime expected credit losses | Positions that are not credit impaired | Remeasurements without stage transfers | Financial intermediaries and hedge funds      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (8) 12  
Lifetime expected credit losses | Positions that are not credit impaired | Model changes      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 1 16  
Lifetime expected credit losses | Positions that are not credit impaired | Movements without profit or loss impact (write-off, FX and other)      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 1 9  
Lifetime expected credit losses | Credit-impaired positions      
Disclosure Of Credit Risk Exposure [Table]      
Total ECL allowances and provisions (564) (662) (829)
Lifetime expected credit losses | Credit-impaired positions | ECL movement with profit or loss impact      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 0 25  
Lifetime expected credit losses | Credit-impaired positions | Net movement from new and derecognized transactions      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (2) 0  
Lifetime expected credit losses | Credit-impaired positions | Net movement from new and derecognized transactions | Private clients with mortgages      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 0 0  
Lifetime expected credit losses | Credit-impaired positions | Net movement from new and derecognized transactions | Real estate financing      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 0 0  
Lifetime expected credit losses | Credit-impaired positions | Net movement from new and derecognized transactions | Large corporate clients      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (2) 0  
Lifetime expected credit losses | Credit-impaired positions | Net movement from new and derecognized transactions | SME clients      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 0 0  
Lifetime expected credit losses | Credit-impaired positions | Net movement from new and derecognized transactions | Other      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 0 0  
Lifetime expected credit losses | Credit-impaired positions | Net movement from new and derecognized transactions | Loans to financial advisors      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 0 0  
Lifetime expected credit losses | Credit-impaired positions | Net movement from new and derecognized transactions | Financial intermediaries and hedge funds      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 0 0  
Lifetime expected credit losses | Credit-impaired positions | Remeasurements with stage transfers      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (46) (49)  
Lifetime expected credit losses | Credit-impaired positions | Remeasurements with stage transfers | Private clients with mortgages      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 0 0  
Lifetime expected credit losses | Credit-impaired positions | Remeasurements with stage transfers | Real estate financing      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 0 0  
Lifetime expected credit losses | Credit-impaired positions | Remeasurements with stage transfers | Large corporate clients      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (21) (8)  
Lifetime expected credit losses | Credit-impaired positions | Remeasurements with stage transfers | SME clients      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (22) (36)  
Lifetime expected credit losses | Credit-impaired positions | Remeasurements with stage transfers | Other      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (3) (4)  
Lifetime expected credit losses | Credit-impaired positions | Remeasurements with stage transfers | Loans to financial advisors      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 0 0  
Lifetime expected credit losses | Credit-impaired positions | Remeasurements with stage transfers | Financial intermediaries and hedge funds      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 0 0  
Lifetime expected credit losses | Credit-impaired positions | Remeasurements without stage transfers      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 48 74  
Lifetime expected credit losses | Credit-impaired positions | Remeasurements without stage transfers | Private clients with mortgages      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 1 (1)  
Lifetime expected credit losses | Credit-impaired positions | Remeasurements without stage transfers | Real estate financing      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 0 3  
Lifetime expected credit losses | Credit-impaired positions | Remeasurements without stage transfers | Large corporate clients      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 41 17  
Lifetime expected credit losses | Credit-impaired positions | Remeasurements without stage transfers | SME clients      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 14 53  
Lifetime expected credit losses | Credit-impaired positions | Remeasurements without stage transfers | Other      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (8) 2  
Lifetime expected credit losses | Credit-impaired positions | Remeasurements without stage transfers | Loans to financial advisors      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (6) (3)  
Lifetime expected credit losses | Credit-impaired positions | Remeasurements without stage transfers | Financial intermediaries and hedge funds      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 0 0  
Lifetime expected credit losses | Credit-impaired positions | Model changes      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 0 0  
Lifetime expected credit losses | Credit-impaired positions | Movements without profit or loss impact (write-off, FX and other)      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 99 141  
Lifetime expected credit losses | Credit-impaired positions | Write offs      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 95    
UBS AG      
Disclosure Of Credit Risk Exposure [Table]      
Total ECL allowances and provisions (1,091) (1,165) (1,468)
UBS AG | ECL movement with profit or loss impact      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (29) 148  
UBS AG | Net movement from new and derecognized transactions      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (7) (59)  
UBS AG | Net movement from new and derecognized transactions | Private clients with mortgages      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (6) (7)  
UBS AG | Net movement from new and derecognized transactions | Real estate financing      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (3) (7)  
UBS AG | Net movement from new and derecognized transactions | Large corporate clients      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 8 (13)  
UBS AG | Net movement from new and derecognized transactions | SME clients      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (1) (8)  
UBS AG | Net movement from new and derecognized transactions | Other      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (6) (24)  
UBS AG | Net movement from new and derecognized transactions | Loans to financial advisors      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 0 0  
UBS AG | Net movement from new and derecognized transactions | Financial intermediaries and hedge funds      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 0 (21)  
UBS AG | Remeasurements with stage transfers      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (65) (40)  
UBS AG | Remeasurements with stage transfers | Private clients with mortgages      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (10) (9)  
UBS AG | Remeasurements with stage transfers | Real estate financing      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 7 (3)  
UBS AG | Remeasurements with stage transfers | Large corporate clients      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (33) 2  
UBS AG | Remeasurements with stage transfers | SME clients      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (23) (27)  
UBS AG | Remeasurements with stage transfers | Other      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (6) (3)  
UBS AG | Remeasurements with stage transfers | Loans to financial advisors      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 1 0  
UBS AG | Remeasurements with stage transfers | Financial intermediaries and hedge funds      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 0 2  
UBS AG | Remeasurements without stage transfers      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 13 203  
UBS AG | Remeasurements without stage transfers | Private clients with mortgages      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (12) 33  
UBS AG | Remeasurements without stage transfers | Real estate financing      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 13 30  
UBS AG | Remeasurements without stage transfers | Large corporate clients      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 32 44  
UBS AG | Remeasurements without stage transfers | SME clients      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (6) 53  
UBS AG | Remeasurements without stage transfers | Other      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (15) 44  
UBS AG | Remeasurements without stage transfers | Loans to financial advisors      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (3) 6  
UBS AG | Remeasurements without stage transfers | Financial intermediaries and hedge funds      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (8) 27  
UBS AG | Model changes      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 30 45  
UBS AG | Movements without profit or loss impact (write-off, FX and other)      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 104 154  
UBS AG | Positions that are not credit impaired | ECL movement with profit or loss impact      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (29)    
UBS AG | Positions that are not credit impaired | Remeasurements without stage transfers      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (35)    
UBS AG | Positions that are not credit impaired | Remeasurements without stage transfers | Large and SME corporate lending      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (28)    
UBS AG | Positions that are not credit impaired | Remeasurements without stage transfers | Financial intermediaries and hedge funds      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (8)    
UBS AG | Twelve-month expected credit losses | Positions that are not credit impaired      
Disclosure Of Credit Risk Exposure [Table]      
Total ECL allowances and provisions (260) (282) (306)
UBS AG | Twelve-month expected credit losses | Positions that are not credit impaired | ECL movement with profit or loss impact      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 20 19  
UBS AG | Twelve-month expected credit losses | Positions that are not credit impaired | Net movement from new and derecognized transactions      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (21) (72)  
UBS AG | Twelve-month expected credit losses | Positions that are not credit impaired | Net movement from new and derecognized transactions | Private clients with mortgages      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (6) (10)  
UBS AG | Twelve-month expected credit losses | Positions that are not credit impaired | Net movement from new and derecognized transactions | Real estate financing      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (5) (11)  
UBS AG | Twelve-month expected credit losses | Positions that are not credit impaired | Net movement from new and derecognized transactions | Large corporate clients      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (1) (21)  
UBS AG | Twelve-month expected credit losses | Positions that are not credit impaired | Net movement from new and derecognized transactions | SME clients      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (1) (8)  
UBS AG | Twelve-month expected credit losses | Positions that are not credit impaired | Net movement from new and derecognized transactions | Other      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (8) (23)  
UBS AG | Twelve-month expected credit losses | Positions that are not credit impaired | Net movement from new and derecognized transactions | Loans to financial advisors      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 0 (1)  
UBS AG | Twelve-month expected credit losses | Positions that are not credit impaired | Net movement from new and derecognized transactions | Financial intermediaries and hedge funds      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (2) (18)  
UBS AG | Twelve-month expected credit losses | Positions that are not credit impaired | Remeasurements with stage transfers      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 20 8  
UBS AG | Twelve-month expected credit losses | Positions that are not credit impaired | Remeasurements with stage transfers | Private clients with mortgages      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 3 4  
UBS AG | Twelve-month expected credit losses | Positions that are not credit impaired | Remeasurements with stage transfers | Real estate financing      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (1) 1  
UBS AG | Twelve-month expected credit losses | Positions that are not credit impaired | Remeasurements with stage transfers | Large corporate clients      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 16 (2)  
UBS AG | Twelve-month expected credit losses | Positions that are not credit impaired | Remeasurements with stage transfers | SME clients      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 2 5  
UBS AG | Twelve-month expected credit losses | Positions that are not credit impaired | Remeasurements with stage transfers | Other      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 1 0  
UBS AG | Twelve-month expected credit losses | Positions that are not credit impaired | Remeasurements with stage transfers | Loans to financial advisors      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 2 1  
UBS AG | Twelve-month expected credit losses | Positions that are not credit impaired | Remeasurements with stage transfers | Financial intermediaries and hedge funds      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 0 (1)  
UBS AG | Twelve-month expected credit losses | Positions that are not credit impaired | Remeasurements without stage transfers      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (8) 55  
UBS AG | Twelve-month expected credit losses | Positions that are not credit impaired | Remeasurements without stage transfers | Private clients with mortgages      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 5 8  
UBS AG | Twelve-month expected credit losses | Positions that are not credit impaired | Remeasurements without stage transfers | Real estate financing      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 3 13  
UBS AG | Twelve-month expected credit losses | Positions that are not credit impaired | Remeasurements without stage transfers | Large corporate clients      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (11) 5  
UBS AG | Twelve-month expected credit losses | Positions that are not credit impaired | Remeasurements without stage transfers | SME clients      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (10) (1)  
UBS AG | Twelve-month expected credit losses | Positions that are not credit impaired | Remeasurements without stage transfers | Other      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 5 29  
UBS AG | Twelve-month expected credit losses | Positions that are not credit impaired | Remeasurements without stage transfers | Loans to financial advisors      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 3 8  
UBS AG | Twelve-month expected credit losses | Positions that are not credit impaired | Remeasurements without stage transfers | Financial intermediaries and hedge funds      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 0 15  
UBS AG | Twelve-month expected credit losses | Positions that are not credit impaired | Model changes      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 29 29  
UBS AG | Twelve-month expected credit losses | Positions that are not credit impaired | Movements without profit or loss impact (write-off, FX and other)      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 3 5  
UBS AG | Lifetime expected credit losses | Positions that are not credit impaired      
Disclosure Of Credit Risk Exposure [Table]      
Total ECL allowances and provisions (267) (220) (333)
UBS AG | Lifetime expected credit losses | Positions that are not credit impaired | Private clients with mortgages      
Disclosure Of Credit Risk Exposure [Table]      
Total ECL allowances and provisions (107)    
UBS AG | Lifetime expected credit losses | Positions that are not credit impaired | Real estate financing      
Disclosure Of Credit Risk Exposure [Table]      
Total ECL allowances and provisions (23)    
UBS AG | Lifetime expected credit losses | Positions that are not credit impaired | Large corporate clients      
Disclosure Of Credit Risk Exposure [Table]      
Total ECL allowances and provisions (65)    
UBS AG | Lifetime expected credit losses | Positions that are not credit impaired | SME clients      
Disclosure Of Credit Risk Exposure [Table]      
Total ECL allowances and provisions (37)    
UBS AG | Lifetime expected credit losses | Positions that are not credit impaired | Other      
Disclosure Of Credit Risk Exposure [Table]      
Total ECL allowances and provisions (5)    
UBS AG | Lifetime expected credit losses | Positions that are not credit impaired | Loans to financial advisors      
Disclosure Of Credit Risk Exposure [Table]      
Total ECL allowances and provisions (2)    
UBS AG | Lifetime expected credit losses | Positions that are not credit impaired | Credit cards      
Disclosure Of Credit Risk Exposure [Table]      
Total ECL allowances and provisions (12)    
UBS AG | Lifetime expected credit losses | Positions that are not credit impaired | ECL movement with profit or loss impact      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (49) 104  
UBS AG | Lifetime expected credit losses | Positions that are not credit impaired | Net movement from new and derecognized transactions      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 16 13  
UBS AG | Lifetime expected credit losses | Positions that are not credit impaired | Net movement from new and derecognized transactions | Private clients with mortgages      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 0 3  
UBS AG | Lifetime expected credit losses | Positions that are not credit impaired | Net movement from new and derecognized transactions | Real estate financing      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 2 4  
UBS AG | Lifetime expected credit losses | Positions that are not credit impaired | Net movement from new and derecognized transactions | Large corporate clients      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 11 7  
UBS AG | Lifetime expected credit losses | Positions that are not credit impaired | Net movement from new and derecognized transactions | SME clients      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 0 0  
UBS AG | Lifetime expected credit losses | Positions that are not credit impaired | Net movement from new and derecognized transactions | Other      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 3 (2)  
UBS AG | Lifetime expected credit losses | Positions that are not credit impaired | Net movement from new and derecognized transactions | Loans to financial advisors      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 0 1  
UBS AG | Lifetime expected credit losses | Positions that are not credit impaired | Net movement from new and derecognized transactions | Financial intermediaries and hedge funds      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 2 (4)  
UBS AG | Lifetime expected credit losses | Positions that are not credit impaired | Remeasurements with stage transfers      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (39) 0  
UBS AG | Lifetime expected credit losses | Positions that are not credit impaired | Remeasurements with stage transfers | Private clients with mortgages      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (12) (13)  
UBS AG | Lifetime expected credit losses | Positions that are not credit impaired | Remeasurements with stage transfers | Real estate financing      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 8 (4)  
UBS AG | Lifetime expected credit losses | Positions that are not credit impaired | Remeasurements with stage transfers | Large corporate clients      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (28) 12  
UBS AG | Lifetime expected credit losses | Positions that are not credit impaired | Remeasurements with stage transfers | SME clients      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (2) 4  
UBS AG | Lifetime expected credit losses | Positions that are not credit impaired | Remeasurements with stage transfers | Other      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (4) 2  
UBS AG | Lifetime expected credit losses | Positions that are not credit impaired | Remeasurements with stage transfers | Loans to financial advisors      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (1) (1)  
UBS AG | Lifetime expected credit losses | Positions that are not credit impaired | Remeasurements with stage transfers | Financial intermediaries and hedge funds      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 0 3  
UBS AG | Lifetime expected credit losses | Positions that are not credit impaired | Remeasurements without stage transfers      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (27) 74  
UBS AG | Lifetime expected credit losses | Positions that are not credit impaired | Remeasurements without stage transfers | Private clients with mortgages      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (18) 26  
UBS AG | Lifetime expected credit losses | Positions that are not credit impaired | Remeasurements without stage transfers | Real estate financing      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 10 13  
UBS AG | Lifetime expected credit losses | Positions that are not credit impaired | Remeasurements without stage transfers | Large corporate clients      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 2 21  
UBS AG | Lifetime expected credit losses | Positions that are not credit impaired | Remeasurements without stage transfers | SME clients      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (9) 1  
UBS AG | Lifetime expected credit losses | Positions that are not credit impaired | Remeasurements without stage transfers | Other      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (12) 14  
UBS AG | Lifetime expected credit losses | Positions that are not credit impaired | Remeasurements without stage transfers | Loans to financial advisors      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (1) 1  
UBS AG | Lifetime expected credit losses | Positions that are not credit impaired | Remeasurements without stage transfers | Financial intermediaries and hedge funds      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (8) 12  
UBS AG | Lifetime expected credit losses | Positions that are not credit impaired | Model changes      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 1 16  
UBS AG | Lifetime expected credit losses | Positions that are not credit impaired | Movements without profit or loss impact (write-off, FX and other)      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 1 9  
UBS AG | Lifetime expected credit losses | Credit-impaired positions      
Disclosure Of Credit Risk Exposure [Table]      
Total ECL allowances and provisions (564) (662) $ (829)
UBS AG | Lifetime expected credit losses | Credit-impaired positions | ECL movement with profit or loss impact      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 0 25  
UBS AG | Lifetime expected credit losses | Credit-impaired positions | Net movement from new and derecognized transactions      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (2) 0  
UBS AG | Lifetime expected credit losses | Credit-impaired positions | Net movement from new and derecognized transactions | Private clients with mortgages      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 0 0  
UBS AG | Lifetime expected credit losses | Credit-impaired positions | Net movement from new and derecognized transactions | Real estate financing      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 0 0  
UBS AG | Lifetime expected credit losses | Credit-impaired positions | Net movement from new and derecognized transactions | Large corporate clients      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (2) 0  
UBS AG | Lifetime expected credit losses | Credit-impaired positions | Net movement from new and derecognized transactions | SME clients      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 0 0  
UBS AG | Lifetime expected credit losses | Credit-impaired positions | Net movement from new and derecognized transactions | Other      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 0 0  
UBS AG | Lifetime expected credit losses | Credit-impaired positions | Net movement from new and derecognized transactions | Loans to financial advisors      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 0 0  
UBS AG | Lifetime expected credit losses | Credit-impaired positions | Net movement from new and derecognized transactions | Financial intermediaries and hedge funds      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 0 0  
UBS AG | Lifetime expected credit losses | Credit-impaired positions | Remeasurements with stage transfers      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (46) (49)  
UBS AG | Lifetime expected credit losses | Credit-impaired positions | Remeasurements with stage transfers | Private clients with mortgages      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 0 0  
UBS AG | Lifetime expected credit losses | Credit-impaired positions | Remeasurements with stage transfers | Real estate financing      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 0 0  
UBS AG | Lifetime expected credit losses | Credit-impaired positions | Remeasurements with stage transfers | Large corporate clients      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (21) (8)  
UBS AG | Lifetime expected credit losses | Credit-impaired positions | Remeasurements with stage transfers | SME clients      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (22) (36)  
UBS AG | Lifetime expected credit losses | Credit-impaired positions | Remeasurements with stage transfers | Other      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (3) (4)  
UBS AG | Lifetime expected credit losses | Credit-impaired positions | Remeasurements with stage transfers | Loans to financial advisors      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 0 0  
UBS AG | Lifetime expected credit losses | Credit-impaired positions | Remeasurements with stage transfers | Financial intermediaries and hedge funds      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 0 0  
UBS AG | Lifetime expected credit losses | Credit-impaired positions | Remeasurements without stage transfers      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 48 74  
UBS AG | Lifetime expected credit losses | Credit-impaired positions | Remeasurements without stage transfers | Private clients with mortgages      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 1 (1)  
UBS AG | Lifetime expected credit losses | Credit-impaired positions | Remeasurements without stage transfers | Real estate financing      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 0 3  
UBS AG | Lifetime expected credit losses | Credit-impaired positions | Remeasurements without stage transfers | Large corporate clients      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 41 17  
UBS AG | Lifetime expected credit losses | Credit-impaired positions | Remeasurements without stage transfers | SME clients      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 14 53  
UBS AG | Lifetime expected credit losses | Credit-impaired positions | Remeasurements without stage transfers | Other      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (8) 2  
UBS AG | Lifetime expected credit losses | Credit-impaired positions | Remeasurements without stage transfers | Loans to financial advisors      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (6) (3)  
UBS AG | Lifetime expected credit losses | Credit-impaired positions | Remeasurements without stage transfers | Financial intermediaries and hedge funds      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 0 0  
UBS AG | Lifetime expected credit losses | Credit-impaired positions | Model changes      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 0 0  
UBS AG | Lifetime expected credit losses | Credit-impaired positions | Movements without profit or loss impact (write-off, FX and other)      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 99 $ 141  
UBS AG | Lifetime expected credit losses | Credit-impaired positions | Write offs      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions $ 95