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Segment reporting 3 (Detail) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended
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
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
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
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)  
Credit Suisse BDs | Conversion from US GAAP to IFRS (excluding PPA accretion)            
Disclosure Of Operating Segments [Line Items]            
Total revenues 44          
Credit loss expense / (release) 623          
Operating expenses (166)          
Operating profit / (loss) before tax (413)          
Credit Suisse BDs | of which: ECL adjustment            
Disclosure Of Operating Segments [Line Items]            
Credit loss expense / (release) 623          
Operating profit / (loss) before tax (623)          
Credit Suisse BDs | of which: Share-based compensation            
Disclosure Of Operating Segments [Line Items]            
Operating expenses (130)          
Operating profit / (loss) before tax 130          
Credit Suisse BDs | of which: other            
Disclosure Of Operating Segments [Line Items]            
Total revenues 44          
Operating expenses (36)          
Operating profit / (loss) before tax 80          
Credit Suisse BDs | Accretion of Purchase Price Allocation (PPA) adjustments            
Disclosure Of Operating Segments [Line Items]            
Total revenues 369          
Credit loss expense / (release) 0          
Operating expenses 0          
Operating profit / (loss) before tax $ 369