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Litigation, regulatory and similar matters (Detail) - USD ($)
$ in Millions
 3 Months Ended
Jun. 30, 2023
Jun. 12, 2023
Disclosure Of Other Provisions [Line Items]    
Balance at the beginning of period $ 3,723  
Provisions recognized upon acquisition of Credit Suisse   $ 3,545
Increase in provisions recognized in the income statement 111  
Release of provisions recognized in the income statement (9)  
Provisions used in conformity with designated purpose (216)  
Foreign currency translation / unwind of discount 16  
Balance at the end of period 7,170  
Litigation, regulatory and similar matters    
Disclosure Of Other Provisions [Line Items]    
Balance at the beginning of period 3,306  
Provisions recognized upon acquisition of Credit Suisse   2,838
Increase in provisions recognized in the income statement 70  
Release of provisions recognized in the income statement (1)  
Provisions used in conformity with designated purpose (90)  
Foreign currency translation / unwind of discount 2  
Balance at the end of period 6,126  
Litigation, regulatory and similar matters | Global Wealth Management    
Disclosure Of Other Provisions [Line Items]    
Balance at the beginning of period 1,193  
Increase in provisions recognized in the income statement 35  
Release of provisions recognized in the income statement (1)  
Provisions used in conformity with designated purpose (37)  
Foreign currency translation / unwind of discount 7  
Balance at the end of period 1,196  
Litigation, regulatory and similar matters | Personal & Corporate Banking    
Disclosure Of Other Provisions [Line Items]    
Balance at the beginning of period 161  
Increase in provisions recognized in the income statement 0  
Release of provisions recognized in the income statement 0  
Provisions used in conformity with designated purpose 0  
Foreign currency translation / unwind of discount 1  
Balance at the end of period 162  
Litigation, regulatory and similar matters | Asset Management    
Disclosure Of Other Provisions [Line Items]    
Balance at the beginning of period 8  
Increase in provisions recognized in the income statement 1  
Release of provisions recognized in the income statement 0  
Provisions used in conformity with designated purpose (1)  
Foreign currency translation / unwind of discount 0  
Balance at the end of period 8  
Litigation, regulatory and similar matters | Investment Bank    
Disclosure Of Other Provisions [Line Items]    
Balance at the beginning of period 351  
Increase in provisions recognized in the income statement 20  
Release of provisions recognized in the income statement 0  
Provisions used in conformity with designated purpose (45)  
Foreign currency translation / unwind of discount 1  
Balance at the end of period 327  
Litigation, regulatory and similar matters | Group Functions    
Disclosure Of Other Provisions [Line Items]    
Balance at the beginning of period 1,594  
Increase in provisions recognized in the income statement 0  
Release of provisions recognized in the income statement 0  
Provisions used in conformity with designated purpose 0  
Foreign currency translation / unwind of discount 1  
Balance at the end of period 1,595  
Litigation, regulatory and similar matters | Credit Suisse    
Disclosure Of Other Provisions [Line Items]    
Provisions recognized upon acquisition of Credit Suisse   $ 2,838
Increase in provisions recognized in the income statement 14  
Release of provisions recognized in the income statement 0  
Provisions used in conformity with designated purpose (7)  
Foreign currency translation / unwind of discount (8)  
Balance at the end of period $ 2,837