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Expected credit loss measurement - Development of ECL allowances and provisions (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Credit Risk Exposure [Table]      
Total ECL allowances and provisions $ (1,165) $ (1,468) $ (1,029)
ECL movement with profit or loss impact      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 148 (694)  
Net movement from new and derecognized transactions      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (59) (28)  
Net movement from new and derecognized transactions | Private clients with mortgages      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (7) (2)  
Net movement from new and derecognized transactions | Real estate financing      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (7) (3)  
Net movement from new and derecognized transactions | Large corporate clients      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (13) (32)  
Net movement from new and derecognized transactions | SME clients      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (8) (16)  
Net movement from new and derecognized transactions | Other      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (24) 26  
Net movement from new and derecognized transactions | Securities financing transactions REIT      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions   32  
Net movement from new and derecognized transactions | Loans to financial advisors      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 0 9  
Net movement from new and derecognized transactions | Lombard      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions   23  
Net movement from new and derecognized transactions | Financial intermediaries and hedge funds      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (21) (20)  
Book quality movements      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 163    
Remeasurements with stage transfers      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (40) (427)  
Remeasurements with stage transfers | Private clients with mortgages      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (9) (19)  
Remeasurements with stage transfers | Real estate financing      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (3) (6)  
Remeasurements with stage transfers | Large corporate clients      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 2 (224)  
Remeasurements with stage transfers | SME clients      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (27) (43)  
Remeasurements with stage transfers | Other      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (3) (134)  
Remeasurements with stage transfers | Securities financing transactions REIT      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions   (36)  
Remeasurements with stage transfers | Loans to financial advisors      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 0 (12)  
Remeasurements with stage transfers | Lombard      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions   (36)  
Remeasurements with stage transfers | Commodity trade finance      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions   (59)  
Remeasurements with stage transfers | Financial intermediaries and hedge funds      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 2    
Remeasurements without stage transfers      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 203 (271)  
Remeasurements without stage transfers | Private clients with mortgages      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 33 (34)  
Remeasurements without stage transfers | Real estate financing      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 30 (14)  
Remeasurements without stage transfers | Large corporate clients      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 44 (149)  
Remeasurements without stage transfers | SME clients      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 53 (13)  
Remeasurements without stage transfers | Other      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 44 (60)  
Remeasurements without stage transfers | Loans to financial advisors      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 6 (18)  
Remeasurements without stage transfers | Lombard      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions   (3)  
Remeasurements without stage transfers | Financial intermediaries and hedge funds      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 27    
Remeasurements without stage transfers | Credit cards      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions   (12)  
Model changes      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 45 32  
Movements without profit or loss impact (write-off, FX and other)      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 154 254  
Write offs / recoveries      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 137    
Foreign exchange movements      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 18    
Twelve-month expected credit losses | Positions that are not credit impaired      
Disclosure Of Credit Risk Exposure [Table]      
Total ECL allowances and provisions (282) (306) (181)
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 19 (112)  
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 (72) (90)  
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 (10) (3)  
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 (11) (5)  
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 (21) (29)  
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 (8) (14)  
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 (23) (39)  
Twelve-month expected credit losses | Positions that are not credit impaired | Net movement from new and derecognized transactions | Securities financing transactions REIT      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions   (1)  
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 (1) (1)  
Twelve-month expected credit losses | Positions that are not credit impaired | Net movement from new and derecognized transactions | Lombard      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions   (6)  
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 (18) (15)  
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 8 45  
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 4 (2)  
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 3  
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 (2) 34  
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 5 (1)  
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 0 11  
Twelve-month expected credit losses | Positions that are not credit impaired | Remeasurements with stage transfers | Securities financing transactions REIT      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions   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 1 7  
Twelve-month expected credit losses | Positions that are not credit impaired | Remeasurements with stage transfers | Lombard      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions   0  
Twelve-month expected credit losses | Positions that are not credit impaired | Remeasurements with stage transfers | Commodity trade finance      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions   0  
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 (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 55 (88)  
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 8 (19)  
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 13 (4)  
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 5 (53)  
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 (1) 0  
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 29 (11)  
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 8 (12)  
Twelve-month expected credit losses | Positions that are not credit impaired | Remeasurements without stage transfers | Lombard      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions   6  
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 15    
Twelve-month expected credit losses | Positions that are not credit impaired | Remeasurements without stage transfers | Credit cards      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions   0  
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 21  
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 5 (14)  
Lifetime expected credit losses | Positions that are not credit impaired      
Disclosure Of Credit Risk Exposure [Table]      
Total ECL allowances and provisions (220) (333) (160)
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 (71)    
Lifetime expected credit losses | Positions that are not credit impaired | Real estate financing      
Disclosure Of Credit Risk Exposure [Table]      
Total ECL allowances and provisions (43)    
Lifetime expected credit losses | Positions that are not credit impaired | Large corporate clients      
Disclosure Of Credit Risk Exposure [Table]      
Total ECL allowances and provisions (55)    
Lifetime expected credit losses | Positions that are not credit impaired | SME clients      
Disclosure Of Credit Risk Exposure [Table]      
Total ECL allowances and provisions (30)    
Lifetime expected credit losses | Positions that are not credit impaired | Other      
Disclosure Of Credit Risk Exposure [Table]      
Total ECL allowances and provisions (1)    
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 (3)    
Lifetime expected credit losses | Positions that are not credit impaired | Credit cards      
Disclosure Of Credit Risk Exposure [Table]      
Total ECL allowances and provisions (11)    
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 104 (154)  
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 13 17  
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 3 2  
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 4 2  
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 7 (4)  
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 (3)  
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 (2) 20  
Lifetime expected credit losses | Positions that are not credit impaired | Net movement from new and derecognized transactions | Securities financing transactions REIT      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions   15  
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 1 9  
Lifetime expected credit losses | Positions that are not credit impaired | Net movement from new and derecognized transactions | Lombard      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions   0  
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 (4) (5)  
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 0 (134)  
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 (13) (17)  
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 (4) (9)  
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 12 (83)  
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 4 (11)  
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 2 (14)  
Lifetime expected credit losses | Positions that are not credit impaired | Remeasurements with stage transfers | Securities financing transactions REIT      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions   (18)  
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) (7)  
Lifetime expected credit losses | Positions that are not credit impaired | Remeasurements with stage transfers | Lombard      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions   0  
Lifetime expected credit losses | Positions that are not credit impaired | Remeasurements with stage transfers | Commodity trade finance      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions   0  
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 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 74 (47)  
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 26 (8)  
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 13 (11)  
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 21 (17)  
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 1 (7)  
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 14 (4)  
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 (3)  
Lifetime expected credit losses | Positions that are not credit impaired | Remeasurements without stage transfers | Lombard      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions   0  
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 12    
Lifetime expected credit losses | Positions that are not credit impaired | Remeasurements without stage transfers | Credit cards      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions   0  
Lifetime expected credit losses | Positions that are not credit impaired | Model changes      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 16 11  
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 9 (19)  
Lifetime expected credit losses | Credit-impaired positions      
Disclosure Of Credit Risk Exposure [Table]      
Total ECL allowances and provisions (662) (829) (688)
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 25 (429)  
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 0 46  
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 0 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 46  
Lifetime expected credit losses | Credit-impaired positions | Net movement from new and derecognized transactions | Securities financing transactions REIT      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions   17  
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 | Lombard      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions   29  
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 (49) (338)  
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 (8) (175)  
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 (36) (31)  
Lifetime expected credit losses | Credit-impaired positions | Remeasurements with stage transfers | Other      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (4) (131)  
Lifetime expected credit losses | Credit-impaired positions | Remeasurements with stage transfers | Securities financing transactions REIT      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions   (19)  
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 (11)  
Lifetime expected credit losses | Credit-impaired positions | Remeasurements with stage transfers | Lombard      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions   (36)  
Lifetime expected credit losses | Credit-impaired positions | Remeasurements with stage transfers | Commodity trade finance      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions   (59)  
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    
Lifetime expected credit losses | Credit-impaired positions | Remeasurements without stage transfers      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 74 (136)  
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) (7)  
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 3 1  
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 17 (79)  
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 53 (6)  
Lifetime expected credit losses | Credit-impaired positions | Remeasurements without stage transfers | Other      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 2 (44)  
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 (3) (3)  
Lifetime expected credit losses | Credit-impaired positions | Remeasurements without stage transfers | Lombard      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions   (9)  
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    
Lifetime expected credit losses | Credit-impaired positions | Remeasurements without stage transfers | Credit cards      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions   (12)  
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 141 287  
UBS AG      
Disclosure Of Credit Risk Exposure [Table]      
Total ECL allowances and provisions (1,165) (1,468) (1,029)
UBS AG | ECL movement with profit or loss impact      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 148 (694)  
UBS AG | Net movement from new and derecognized transactions      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (59) (28)  
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 (7) (2)  
UBS AG | Net movement from new and derecognized transactions | Real estate financing      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (7) (3)  
UBS AG | Net movement from new and derecognized transactions | Large corporate clients      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (13) (32)  
UBS AG | Net movement from new and derecognized transactions | SME clients      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (8) (16)  
UBS AG | Net movement from new and derecognized transactions | Other      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (24) 26  
UBS AG | Net movement from new and derecognized transactions | Securities financing transactions REIT      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions   32  
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 9  
UBS AG | Net movement from new and derecognized transactions | Lombard      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions   23  
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 (21) (20)  
UBS AG | Book quality movements      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 163    
UBS AG | Remeasurements with stage transfers      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (40) (427)  
UBS AG | Remeasurements with stage transfers | Private clients with mortgages      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (9) (19)  
UBS AG | Remeasurements with stage transfers | Real estate financing      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (3) (6)  
UBS AG | Remeasurements with stage transfers | Large corporate clients      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 2 (224)  
UBS AG | Remeasurements with stage transfers | SME clients      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (27) (43)  
UBS AG | Remeasurements with stage transfers | Other      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions (3) (134)  
UBS AG | Remeasurements with stage transfers | Securities financing transactions REIT      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions   (36)  
UBS AG | Remeasurements with stage transfers | Loans to financial advisors      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 0 (12)  
UBS AG | Remeasurements with stage transfers | Lombard      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions   (36)  
UBS AG | Remeasurements with stage transfers | Commodity trade finance      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions   (59)  
UBS AG | Remeasurements with stage transfers | Financial intermediaries and hedge funds      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 2    
UBS AG | Remeasurements without stage transfers      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 203 (271)  
UBS AG | Remeasurements without stage transfers | Private clients with mortgages      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 33 (34)  
UBS AG | Remeasurements without stage transfers | Real estate financing      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 30 (14)  
UBS AG | Remeasurements without stage transfers | Large corporate clients      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 44 (149)  
UBS AG | Remeasurements without stage transfers | SME clients      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 53 (13)  
UBS AG | Remeasurements without stage transfers | Other      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 44 (60)  
UBS AG | Remeasurements without stage transfers | Loans to financial advisors      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 6 (18)  
UBS AG | Remeasurements without stage transfers | Lombard      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions   (3)  
UBS AG | Remeasurements without stage transfers | Financial intermediaries and hedge funds      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 27    
UBS AG | Remeasurements without stage transfers | Credit cards      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions   (12)  
UBS AG | Model changes      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 45 32  
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 154 254  
UBS AG | Write offs / recoveries      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 137    
UBS AG | Foreign exchange movements      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions 18    
UBS AG | Twelve-month expected credit losses | Positions that are not credit impaired      
Disclosure Of Credit Risk Exposure [Table]      
Total ECL allowances and provisions (282) (306) (181)
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 19 (112)  
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 (72) (90)  
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 (10) (3)  
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 (11) (5)  
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 (21) (29)  
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 (8) (14)  
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 (23) (39)  
UBS AG | Twelve-month expected credit losses | Positions that are not credit impaired | Net movement from new and derecognized transactions | Securities financing transactions REIT      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions   (1)  
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 (1) (1)  
UBS AG | Twelve-month expected credit losses | Positions that are not credit impaired | Net movement from new and derecognized transactions | Lombard      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions   (6)  
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 (18) (15)  
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 8 45  
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 4 (2)  
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 3  
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 (2) 34  
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 5 (1)  
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 0 11  
UBS AG | Twelve-month expected credit losses | Positions that are not credit impaired | Remeasurements with stage transfers | Securities financing transactions REIT      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions   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 1 7  
UBS AG | Twelve-month expected credit losses | Positions that are not credit impaired | Remeasurements with stage transfers | Lombard      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions   0  
UBS AG | Twelve-month expected credit losses | Positions that are not credit impaired | Remeasurements with stage transfers | Commodity trade finance      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions   0  
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 (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 55 (88)  
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 8 (19)  
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 13 (4)  
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 5 (53)  
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 (1) 0  
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 29 (11)  
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 8 (12)  
UBS AG | Twelve-month expected credit losses | Positions that are not credit impaired | Remeasurements without stage transfers | Lombard      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions   6  
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 15    
UBS AG | Twelve-month expected credit losses | Positions that are not credit impaired | Remeasurements without stage transfers | Credit cards      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions   0  
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 21  
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 5 (14)  
UBS AG | Lifetime expected credit losses | Positions that are not credit impaired      
Disclosure Of Credit Risk Exposure [Table]      
Total ECL allowances and provisions (220) (333) (160)
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 (71)    
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 (43)    
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 (55)    
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 (30)    
UBS AG | Lifetime expected credit losses | Positions that are not credit impaired | Other      
Disclosure Of Credit Risk Exposure [Table]      
Total ECL allowances and provisions (1)    
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 (3)    
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 (11)    
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 104 (154)  
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 13 17  
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 3 2  
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 4 2  
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 7 (4)  
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 (3)  
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 (2) 20  
UBS AG | Lifetime expected credit losses | Positions that are not credit impaired | Net movement from new and derecognized transactions | Securities financing transactions REIT      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions   15  
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 1 9  
UBS AG | Lifetime expected credit losses | Positions that are not credit impaired | Net movement from new and derecognized transactions | Lombard      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions   0  
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 (4) (5)  
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 0 (134)  
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 (13) (17)  
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 (4) (9)  
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 12 (83)  
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 4 (11)  
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 2 (14)  
UBS AG | Lifetime expected credit losses | Positions that are not credit impaired | Remeasurements with stage transfers | Securities financing transactions REIT      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions   (18)  
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) (7)  
UBS AG | Lifetime expected credit losses | Positions that are not credit impaired | Remeasurements with stage transfers | Lombard      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions   0  
UBS AG | Lifetime expected credit losses | Positions that are not credit impaired | Remeasurements with stage transfers | Commodity trade finance      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions   0  
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 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 74 (47)  
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 26 (8)  
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 13 (11)  
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 21 (17)  
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 1 (7)  
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 14 (4)  
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 (3)  
UBS AG | Lifetime expected credit losses | Positions that are not credit impaired | Remeasurements without stage transfers | Lombard      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions   0  
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 12    
UBS AG | Lifetime expected credit losses | Positions that are not credit impaired | Remeasurements without stage transfers | Credit cards      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions   0  
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 16 11  
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 9 (19)  
UBS AG | Lifetime expected credit losses | Credit-impaired positions      
Disclosure Of Credit Risk Exposure [Table]      
Total ECL allowances and provisions (662) (829) $ (688)
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 25 (429)  
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 0 46  
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 0 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 46  
UBS AG | Lifetime expected credit losses | Credit-impaired positions | Net movement from new and derecognized transactions | Securities financing transactions REIT      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions   17  
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 | Lombard      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions   29  
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 (49) (338)  
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 (8) (175)  
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 (36) (31)  
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 (4) (131)  
UBS AG | Lifetime expected credit losses | Credit-impaired positions | Remeasurements with stage transfers | Securities financing transactions REIT      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions   (19)  
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 (11)  
UBS AG | Lifetime expected credit losses | Credit-impaired positions | Remeasurements with stage transfers | Lombard      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions   (36)  
UBS AG | Lifetime expected credit losses | Credit-impaired positions | Remeasurements with stage transfers | Commodity trade finance      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions   (59)  
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    
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 74 (136)  
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) (7)  
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 3 1  
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 17 (79)  
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 53 (6)  
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 2 (44)  
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 (3) (3)  
UBS AG | Lifetime expected credit losses | Credit-impaired positions | Remeasurements without stage transfers | Lombard      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions   (9)  
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    
UBS AG | Lifetime expected credit losses | Credit-impaired positions | Remeasurements without stage transfers | Credit cards      
Disclosure Of Credit Risk Exposure [Table]      
Development of ECL allowances and provisions   (12)  
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 $ 141 $ 287