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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)

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