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Segment reporting (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Disclosure Of Operating Segments [Line Items]          
Total revenues $ 9,540 $ 8,744 $ 8,917 $ 18,284 $ 18,299
Credit loss expense / (release) 740 38 7 778 25
Operating expenses 8,486 7,210 6,295 15,696 12,929
Operating profit / (loss) before tax 29,239 1,495 2,615 30,735 5,344
Tax expense / (benefit) 361 459 497 820 1,082
Net profit / (loss) 28,878 1,037 2,118 29,915 4,262
UBS BDs          
Disclosure Of Operating Segments [Line Items]          
Total revenues       17,128 18,299
Credit loss expense / (release) 16     54 25
Operating expenses       14,055 12,929
Operating profit / (loss) before tax       3,019 5,344
Tax expense / (benefit)       807 1,082
Net profit / (loss)       2,212 4,262
Global Wealth Management          
Disclosure Of Operating Segments [Line Items]          
Total revenues       9,528 9,581
Credit loss expense / (release) 5 15 (3) 20 (10)
Operating expenses       7,182 7,124
Operating profit / (loss) before tax       2,325 2,467
Personal & Corporate Banking          
Disclosure Of Operating Segments [Line Items]          
Total revenues       2,681 2,144
Credit loss expense / (release) 10 16 35 26 57
Operating expenses       1,376 1,246
Operating profit / (loss) before tax       1,279 841
Asset Management          
Disclosure Of Operating Segments [Line Items]          
Total revenues       1,001 1,950
Credit loss expense / (release) 0 0 0 0 0
Operating expenses       818 817
Operating profit / (loss) before tax       184 1,133
Investment Bank          
Disclosure Of Operating Segments [Line Items]          
Total revenues       4,241 5,003
Credit loss expense / (release) 1 7 (28) 8 (24)
Operating expenses       3,618 3,688
Operating profit / (loss) before tax       615 1,339
Group Functions          
Disclosure Of Operating Segments [Line Items]          
Total revenues       (323) (379)
Credit loss expense / (release) $ 0 $ 0 $ 2 0 2
Operating expenses       1,062 54
Operating profit / (loss) before tax       $ (1,385) $ (436)