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Segment reporting 2 (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)  
Wealth Management            
Disclosure Of Operating Segments [Line Items]            
Credit loss expense / (release)   149        
Wealth Management | US GAAP            
Disclosure Of Operating Segments [Line Items]            
Total revenues 323          
Credit loss expense / (release) 7          
Operating expenses 427          
Operating profit / (loss) before tax (111)          
Swiss Bank            
Disclosure Of Operating Segments [Line Items]            
Credit loss expense / (release)   224        
Swiss Bank | US GAAP            
Disclosure Of Operating Segments [Line Items]            
Total revenues 339          
Credit loss expense / (release) 67          
Operating expenses 264          
Operating profit / (loss) before tax 8          
Asset Management            
Disclosure Of Operating Segments [Line Items]            
Credit loss expense / (release)   1        
Asset Management | US GAAP            
Disclosure Of Operating Segments [Line Items]            
Total revenues 91          
Credit loss expense / (release) 2          
Operating expenses 103          
Operating profit / (loss) before tax (14)          
Investment Bank            
Disclosure Of Operating Segments [Line Items]            
Credit loss expense / (release)   200        
Investment Bank | US GAAP            
Disclosure Of Operating Segments [Line Items]            
Total revenues 102          
Credit loss expense / (release) (3)          
Operating expenses 715          
Operating profit / (loss) before tax (610)          
Capital Release Unit            
Disclosure Of Operating Segments [Line Items]            
Credit loss expense / (release)   148        
Capital Release Unit | US GAAP            
Disclosure Of Operating Segments [Line Items]            
Total revenues 28          
Credit loss expense / (release) 28          
Operating expenses 198          
Operating profit / (loss) before tax (198)          
Corporate Center            
Disclosure Of Operating Segments [Line Items]            
Credit loss expense / (release)   $ 2        
Corporate Center | US GAAP            
Disclosure Of Operating Segments [Line Items]            
Total revenues (140)          
Credit loss expense / (release) 0          
Operating expenses 100          
Operating profit / (loss) before tax $ (240)