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Provisions (Detail 2) - USD ($)
$ in Millions
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Disclosure Of Other Provisions [Line Items]      
Other provisions $ 7,170 $ 3,723 $ 3,042
Litigation, regulatory and similar matters      
Disclosure Of Other Provisions [Line Items]      
Other provisions 6,126 3,306 2,586
Litigation, regulatory and similar matters | Global Wealth Management      
Disclosure Of Other Provisions [Line Items]      
Other provisions 1,196 1,193 1,182
Litigation, regulatory and similar matters | Personal & Corporate Banking      
Disclosure Of Other Provisions [Line Items]      
Other provisions 162 161 159
Litigation, regulatory and similar matters | Asset Management      
Disclosure Of Other Provisions [Line Items]      
Other provisions 8 8 8
Litigation, regulatory and similar matters | Investment Bank      
Disclosure Of Other Provisions [Line Items]      
Other provisions 327 351 308
Litigation, regulatory and similar matters | Group Functions      
Disclosure Of Other Provisions [Line Items]      
Other provisions 1,595 1,594 928
Other      
Disclosure Of Other Provisions [Line Items]      
Other provisions $ 1,044 $ 416 $ 456