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Segment reporting 3 (Detail) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jun. 30, 2023 | 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
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
Credit Suisse BDs |  |  |  |  |  |
Disclosure Of Operating Segments [Line Items] |  |  |  |  |  |
Credit loss expense / (release) |  | $ 724 |  |  |  |
Credit Suisse BDs | US GAAP |  |  |  |  |  |
Disclosure Of Operating Segments [Line Items] |  |  |  |  |  |
Total revenues | $ 743 |  |  |  | 743 |
Credit loss expense / (release) | 101 |  |  |  | 101 |
Operating expenses | 1,807 |  |  |  | 1,807 |
Operating profit / (loss) before tax | (1,165) |  |  |  | (1,165) |
Credit Suisse BDs | Reconciliation from US GAAP to IFRS |  |  |  |  |  |
Disclosure Of Operating Segments [Line Items] |  |  |  |  |  |
Total revenues | 413 |  |  |  | 413 |
Credit loss expense / (release) | 623 |  |  |  | 623 |
Operating expenses | (166) |  |  |  | (166) |
Operating profit / (loss) before tax | (44) |  |  |  | $ (44) |
Credit Suisse BDs | Conversion from US GAAP to IFRS (excluding PPA accretion) |  |  |  |  |  |
Disclosure Of Operating Segments [Line Items] |  |  |  |  |  |
Total revenues | 44 |  |  |  |  |
Credit loss expense / (release) | 623 |  |  |  |  |
Operating expenses | (166) |  |  |  |  |
Operating profit / (loss) before tax | (413) |  |  |  |  |
Credit Suisse BDs | of which: ECL adjustment |  |  |  |  |  |
Disclosure Of Operating Segments [Line Items] |  |  |  |  |  |
Credit loss expense / (release) | 623 |  |  |  |  |
Operating profit / (loss) before tax | (623) |  |  |  |  |
Credit Suisse BDs | of which: Share-based compensation |  |  |  |  |  |
Disclosure Of Operating Segments [Line Items] |  |  |  |  |  |
Operating expenses | (130) |  |  |  |  |
Operating profit / (loss) before tax | 130 |  |  |  |  |
Credit Suisse BDs | of which: other |  |  |  |  |  |
Disclosure Of Operating Segments [Line Items] |  |  |  |  |  |
Total revenues | 44 |  |  |  |  |
Operating expenses | (36) |  |  |  |  |
Operating profit / (loss) before tax | 80 |  |  |  |  |
Credit Suisse BDs | Accretion of Purchase Price Allocation (PPA) adjustments |  |  |  |  |  |
Disclosure Of Operating Segments [Line Items] |  |  |  |  |  |
Total revenues | 369 |  |  |  |  |
Credit loss expense / (release) | 0 |  |  |  |  |
Operating expenses | 0 |  |  |  |  |
Operating profit / (loss) before tax | $ 369 |  |  |  |  |

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