v3.25.2
Litigation, regulatory and similar matters (Detail) - USD ($)
$ in Millions
 3 Months Ended
Jun. 30, 2025
Dec. 31, 2024
Disclosure Of Other Provisions [Line Items]    
Balance at the end of period $ 4,943 $ 4,969
Balance as of 31 March 2025 5,340  
Increase in provisions recognized in the income statement 661  
Release of provisions recognized in the income statement (348)  
Provisions used in conformity with designated purpose (1,003)  
Reclassifications 44  
Foreign currency translation and other movements 248  
Balance as of 30 June 2025 4,943  
Litigation, regulatory and similar matters    
Disclosure Of Other Provisions [Line Items]    
Balance at the end of period 3,450 3,602
Balance as of 31 March 2025 3,852  
Increase in provisions recognized in the income statement 256  
Release of provisions recognized in the income statement (137)  
Provisions used in conformity with designated purpose (703)  
Reclassifications 44  
Foreign currency translation and other movements 139  
Balance as of 30 June 2025 3,450  
Litigation, regulatory and similar matters | Global Wealth Management    
Disclosure Of Other Provisions [Line Items]    
Balance at the end of period 1,415 1,271
Balance as of 31 March 2025 1,318  
Increase in provisions recognized in the income statement 16  
Release of provisions recognized in the income statement (2)  
Provisions used in conformity with designated purpose (15)  
Reclassifications 0  
Foreign currency translation and other movements 98  
Balance as of 30 June 2025 1,415  
Litigation, regulatory and similar matters | Personal & Corporate Banking    
Disclosure Of Other Provisions [Line Items]    
Balance at the end of period 167 147
Balance as of 31 March 2025 153  
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  
Reclassifications 0  
Foreign currency translation and other movements 14  
Balance as of 30 June 2025 167  
Litigation, regulatory and similar matters | Asset Management    
Disclosure Of Other Provisions [Line Items]    
Balance at the end of period 0 1
Balance as of 31 March 2025 0  
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  
Reclassifications 0  
Foreign currency translation and other movements 0  
Balance as of 30 June 2025 0  
Litigation, regulatory and similar matters | Investment Bank    
Disclosure Of Other Provisions [Line Items]    
Balance at the end of period 308 266
Balance as of 31 March 2025 293  
Increase in provisions recognized in the income statement 12  
Release of provisions recognized in the income statement (3)  
Provisions used in conformity with designated purpose (11)  
Reclassifications 0  
Foreign currency translation and other movements 17  
Balance as of 30 June 2025 308  
Litigation, regulatory and similar matters | Non-core and Legacy    
Disclosure Of Other Provisions [Line Items]    
Balance at the end of period 1,353 1,779
Balance as of 31 March 2025 1,878  
Increase in provisions recognized in the income statement 227  
Release of provisions recognized in the income statement (132)  
Provisions used in conformity with designated purpose (673)  
Reclassifications 44  
Foreign currency translation and other movements 10  
Balance as of 30 June 2025 1,353  
Litigation, regulatory and similar matters | Group Items    
Disclosure Of Other Provisions [Line Items]    
Balance at the end of period 207 $ 139
Balance as of 31 March 2025 209  
Increase in provisions recognized in the income statement 2  
Release of provisions recognized in the income statement 0  
Provisions used in conformity with designated purpose (4)  
Reclassifications 0  
Foreign currency translation and other movements 1  
Balance as of 30 June 2025 $ 207