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Segment reporting - Income statement (Detail) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended
Jun. 12, 2023
Jun. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Disclosure Of Operating Segments [Line Items]              
Total revenues     $ 9,540 $ 8,744 $ 8,917 $ 18,284 $ 18,299
Negative goodwill     28,925     28,925  
Credit loss expense / (release)     740 38 7 778 25
Operating expenses     8,486 7,210 6,295 15,696 12,929
Operating profit / (loss) before tax     29,239 1,495 2,615 30,735 5,344
Tax expense / (benefit)     361 459 497 820 1,082
Net profit / (loss)     28,878 $ 1,037 $ 2,118 29,915 4,262
Credit Suisse              
Disclosure Of Operating Segments [Line Items]              
Negative goodwill $ 28,925         28,925  
Operating profit / (loss) before tax           28,925  
UBS BDs              
Disclosure Of Operating Segments [Line Items]              
Total revenues           17,128 18,299
Credit loss expense / (release)     16     54 25
Operating expenses           14,055 12,929
Operating profit / (loss) before tax           3,019 5,344
Tax expense / (benefit)           807 1,082
Net profit / (loss)           2,212 $ 4,262
Credit Suisse BDs              
Disclosure Of Operating Segments [Line Items]              
Credit loss expense / (release)     $ 724        
Credit Suisse BDs | US GAAP              
Disclosure Of Operating Segments [Line Items]              
Total revenues   $ 743       743  
Credit loss expense / (release)   101       101  
Operating expenses   1,807       1,807  
Operating profit / (loss) before tax   (1,165)       (1,165)  
Credit Suisse BDs | Reconciliation from US GAAP to IFRS              
Disclosure Of Operating Segments [Line Items]              
Total revenues   413       413  
Credit loss expense / (release)   623       623  
Operating expenses   (166)       (166)  
Operating profit / (loss) before tax   $ (44)       $ (44)