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Segment reporting (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Disclosure Of Operating Segments [Line Items]            
Net interest income $ 1,628 $ 1,613 $ 1,392 $ 3,241 $ 2,722  
Non-interest income       14,333 13,155  
Income       17,574 15,877  
Credit loss (expense) / release 80 28 (272) 108 (540)  
Total operating income 8,976 8,705 7,403 17,681 15,337  
Total operating expenses 6,384 6,407 5,821 12,790 11,747  
Operating profit / (loss) before tax 2,593 2,298 1,582 4,891 3,591  
Tax expense / (benefit) 581 471 347 1,053 757  
Net profit / (loss) 2,012 1,827 $ 1,236 3,838 2,833  
Additional information            
Total assets 1,086,519 $ 1,107,712   1,086,519   $ 1,125,765
Global Wealth Management            
Disclosure Of Operating Segments [Line Items]            
Net interest income       2,023 2,054  
Non-interest income       7,583 6,553  
Income       9,606 8,606  
Credit loss (expense) / release 14     16 (117)  
Total operating income       9,622 8,489  
Total operating expenses       6,918 6,391  
Operating profit / (loss) before tax       2,704 2,098  
Additional information            
Total assets 375,076     375,076   367,714
Personal & Corporate Banking            
Disclosure Of Operating Segments [Line Items]            
Net interest income       1,039 1,029  
Non-interest income       1,063 886  
Income       2,102 1,914  
Credit loss (expense) / release 46     69 (187)  
Total operating income       2,171 1,727  
Total operating expenses       1,284 1,155  
Operating profit / (loss) before tax       888 572  
Additional information            
Total assets 221,958     221,958   231,657
Asset Management            
Disclosure Of Operating Segments [Line Items]            
Net interest income       (7) (9)  
Non-interest income       1,310 1,048  
Income       1,303 1,038  
Credit loss (expense) / release 0     0 0  
Total operating income       1,303 1,038  
Total operating expenses       820 724  
Operating profit / (loss) before tax       482 314  
Additional information            
Total assets 29,468     29,468   28,589
Investment Bank            
Disclosure Of Operating Segments [Line Items]            
Net interest income       244 3  
Non-interest income       4,476 4,914  
Income       4,720 4,917  
Credit loss (expense) / release 21     23 (200)  
Total operating income       4,743 4,718  
Total operating expenses       3,663 3,396  
Operating profit / (loss) before tax       1,080 1,321  
Additional information            
Total assets 343,886     343,886   369,683
Group Functions            
Disclosure Of Operating Segments [Line Items]            
Net interest income       (58) (354)  
Non-interest income       (99) (246)  
Income       (158) (600)  
Credit loss (expense) / release (1)     (1) (35)  
Total operating income       (158) (635)  
Total operating expenses       105 80  
Operating profit / (loss) before tax       (263) $ (715)  
Additional information            
Total assets $ 116,130     $ 116,130   $ 128,122