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Provisions - additional information (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 and other movements 16  
Balance at the end of period 7,170  
Credit Suisse    
Disclosure Of Other Provisions [Line Items]    
Balance at the end of period 3,487  
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 and other movements 2  
Balance at the end of period 6,126  
Litigation, regulatory and similar matters | Credit Suisse    
Disclosure Of Other Provisions [Line Items]    
Balance at the end of period 2,837  
Other    
Disclosure Of Other Provisions [Line Items]    
Balance at the beginning of period 416  
Provisions recognized upon acquisition of Credit Suisse   $ 707
Increase in provisions recognized in the income statement 41  
Release of provisions recognized in the income statement (8)  
Provisions used in conformity with designated purpose (126)  
Foreign currency translation and other movements 14  
Balance at the end of period 1,044  
Other | Credit Suisse    
Disclosure Of Other Provisions [Line Items]    
Balance at the end of period $ 649