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Expected credit loss measurement - CLE for the period (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 Provision Matrix [Line Items] |  |  |  |  |  |
Credit loss expense / (release) |  | $ 740 | $ 38 | $ 7 | $ 778 | $ 25
UBS BDs |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |
Credit loss expense / (release) |  | 16 |  |  | 54 | 25
Global Wealth Management |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |
Credit loss expense / (release) |  | 5 | 15 | (3) | 20 | (10)
Personal & Corporate Banking |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |
Credit loss expense / (release) |  | 10 | 16 | 35 | 26 | 57
Asset Management |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |
Credit loss expense / (release) |  | 0 | 0 | 0 | 0 | 0
Investment Bank |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |
Credit loss expense / (release) |  | 1 | 7 | (28) | 8 | (24)
Group Functions |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |
Credit loss expense / (release) |  | 0 | 0 | 2 | 0 | $ 2
Credit Suisse BDs |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |
Credit loss expense / (release) |  | 724 |  |  |  |
Credit Suisse BDs | US GAAP |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |
Credit loss expense / (release) | $ 101 |  |  |  | 101 |
Credit Suisse BDs | Reconciliation from US GAAP to IFRS |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |
Credit loss expense / (release) | 623 |  |  |  | $ 623 |
Wealth Management |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |
Credit loss expense / (release) |  | 149 |  |  |  |
Wealth Management | US GAAP |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |
Credit loss expense / (release) | 7 |  |  |  |  |
Swiss Bank |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |
Credit loss expense / (release) |  | 224 |  |  |  |
Swiss Bank | US GAAP |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |
Credit loss expense / (release) | 67 |  |  |  |  |
Asset Management |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |
Credit loss expense / (release) |  | 1 |  |  |  |
Asset Management | US GAAP |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |
Credit loss expense / (release) | 2 |  |  |  |  |
Investment Bank |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |
Credit loss expense / (release) |  | 200 |  |  |  |
Investment Bank | US GAAP |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |
Credit loss expense / (release) | (3) |  |  |  |  |
Capital Release Unit |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |
Credit loss expense / (release) |  | 148 |  |  |  |
Capital Release Unit | US GAAP |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |
Credit loss expense / (release) | 28 |  |  |  |  |
Corporate Center |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |
Credit loss expense / (release) |  | 2 |  |  |  |
Corporate Center | US GAAP |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |
Credit loss expense / (release) | $ 0 |  |  |  |  |
Stage 1 and 2 positions |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |
Credit loss expense / (release) |  | 644 | 26 | 16 |  |
Stage 1 and 2 positions | UBS BDs |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |
Credit loss expense / (release) |  | (10) |  |  |  |
Stage 1 and 2 positions | Global Wealth Management |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |
Credit loss expense / (release) |  | (4) | 15 | (8) |  |
Stage 1 and 2 positions | Personal & Corporate Banking |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |
Credit loss expense / (release) |  | (11) | 15 | 26 |  |
Stage 1 and 2 positions | Asset Management |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |
Credit loss expense / (release) |  | 0 | 0 | 0 |  |
Stage 1 and 2 positions | Investment Bank |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |
Credit loss expense / (release) |  | 5 | (5) | (2) |  |
Stage 1 and 2 positions | Group Functions |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |
Credit loss expense / (release) |  | 0 | 0 | 0 |  |
Stage 1 and 2 positions | Credit Suisse BDs |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |
Credit loss expense / (release) |  | 654 |  |  |  |
Stage 1 and 2 positions | Wealth Management |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |
Credit loss expense / (release) |  | 143 |  |  |  |
Stage 1 and 2 positions | Swiss Bank |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |
Credit loss expense / (release) |  | 217 |  |  |  |
Stage 1 and 2 positions | Asset Management |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |
Credit loss expense / (release) |  | 1 |  |  |  |
Stage 1 and 2 positions | Investment Bank |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |
Credit loss expense / (release) |  | 189 |  |  |  |
Stage 1 and 2 positions | Capital Release Unit |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |
Credit loss expense / (release) |  | 104 |  |  |  |
Stage 1 and 2 positions | Corporate Center |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |
Credit loss expense / (release) |  | 2 |  |  |  |
Stage 3 positions |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |
Credit loss expense / (release) |  | 77 | 12 | (9) |  |
Stage 3 positions | UBS BDs |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |
Credit loss expense / (release) |  | 26 |  |  |  |
Stage 3 positions | Global Wealth Management |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |
Credit loss expense / (release) |  | 9 | 0 | 6 |  |
Stage 3 positions | Personal & Corporate Banking |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |
Credit loss expense / (release) |  | 21 | 0 | 8 |  |
Stage 3 positions | Asset Management |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |
Credit loss expense / (release) |  | 0 | 0 | 0 |  |
Stage 3 positions | Investment Bank |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |
Credit loss expense / (release) |  | (4) | 12 | (26) |  |
Stage 3 positions | Group Functions |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |
Credit loss expense / (release) |  | 0 | $ 0 | $ 2 |  |
Stage 3 positions | Credit Suisse BDs |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |
Credit loss expense / (release) |  | 51 |  |  |  |
Stage 3 positions | Wealth Management |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |
Credit loss expense / (release) |  | 0 |  |  |  |
Stage 3 positions | Swiss Bank |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |
Credit loss expense / (release) |  | 7 |  |  |  |
Stage 3 positions | Asset Management |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |
Credit loss expense / (release) |  | 0 |  |  |  |
Stage 3 positions | Investment Bank |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |
Credit loss expense / (release) |  | 0 |  |  |  |
Stage 3 positions | Capital Release Unit |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |
Credit loss expense / (release) |  | 44 |  |  |  |
Stage 3 positions | Corporate Center |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |
Credit loss expense / (release) |  | 0 |  |  |  |
Purchased credit-impaired (PCI) |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |
Credit loss expense / (release) |  | 19 |  |  |  |
Purchased credit-impaired (PCI) | Credit Suisse BDs |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |
Credit loss expense / (release) |  | 19 |  |  |  |
Purchased credit-impaired (PCI) | Wealth Management |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |
Credit loss expense / (release) |  | 7 |  |  |  |
Purchased credit-impaired (PCI) | Swiss Bank |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |
Credit loss expense / (release) |  | 0 |  |  |  |
Purchased credit-impaired (PCI) | Asset Management |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |
Credit loss expense / (release) |  | 0 |  |  |  |
Purchased credit-impaired (PCI) | Investment Bank |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |
Credit loss expense / (release) |  | 12 |  |  |  |
Purchased credit-impaired (PCI) | Capital Release Unit |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |
Credit loss expense / (release) |  | 0 |  |  |  |
Purchased credit-impaired (PCI) | Corporate Center |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |
Credit loss expense / (release) |  | $ 0 |  |  |  |

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