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Expected credit loss measurement - ECL for the period (Narrative) (Detail 2) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2023 | Mar. 31, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Jun. 12, 2023 | Dec. 31, 2022
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |  |
Credit loss expense / (release) | $ 740 | $ 38 | $ 7 | $ 778 | $ 25 |  |
Total ECL allowances and provisions | $ (1,868) | (1,121) |  | (1,868) |  |  | $ (1,091)
Mild debt crisis |  |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |  |
Scenario weights | 15.00% |  |  |  |  |  |
Personal & Corporate Banking |  |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |  |
Credit loss expense / (release) | $ 10 | 16 | 35 | 26 | 57 |  |
Global Wealth Management |  |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |  |
Credit loss expense / (release) | 5 | 15 | (3) | 20 | (10) |  |
Investment Bank |  |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |  |
Credit loss expense / (release) | 1 | 7 | (28) | 8 | (24) |  |
Group Functions - Non-core and Legacy |  |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |  |
Credit loss expense / (release) | 0 | 0 | 2 | 0 | $ 2 |  |
Credit Suisse |  |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |  |
Credit loss expense / (release) | 724 |  |  |  |  |  |
Credit Suisse | Post-model adjustment |  |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |  |
Total ECL allowances and provisions | 102 |  |  | 102 |  |  |
Stage 1 and 2 positions |  |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |  |
Credit loss expense / (release) | 644 | 26 | 16 |  |  |  |
Total ECL allowances and provisions | 1,199 |  |  | 1,199 |  |  |
Stage 1 and 2 positions | Post-model adjustment |  |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |  |
Total ECL allowances and provisions | 131 | 128 |  | $ 131 |  |  |
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 | Global Wealth Management |  |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |  |
Credit loss expense / (release) | (4) | 15 | (8) |  |  |  |
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 - Non-core and Legacy |  |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |  |
Credit loss expense / (release) | 0 | 0 | 0 |  |  |  |
Stage 1 and 2 positions | Credit Suisse |  |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |  |
Credit loss expense / (release) | 654 |  |  |  |  |  |
Stage 3 positions |  |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |  |
Credit loss expense / (release) | 77 | 12 | (9) |  |  |  |
Stage 3 positions | Credit Suisse |  |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |  |
Total ECL allowances and provisions |  |  |  |  |  | $ 1,100 |
Stage 3 positions | Personal & Corporate Banking |  |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |  |
Credit loss expense / (release) | 21 | 0 | 8 |  |  |  |
Stage 3 positions | Global Wealth Management |  |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |  |
Credit loss expense / (release) | 9 | 0 | 6 |  |  |  |
Stage 3 positions | Investment Bank |  |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |  |
Credit loss expense / (release) | (4) | 12 | (26) |  |  |  |
Stage 3 positions | Group Functions - Non-core and Legacy |  |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |  |
Credit loss expense / (release) | 0 | $ 0 | $ 2 |  |  |  |
Stage 3 positions | Credit Suisse |  |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |  |
Credit loss expense / (release) | 51 |  |  |  |  |  |
Purchased credit-impaired (PCI) |  |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |  |
Credit loss expense / (release) | 19 |  |  |  |  |  |
Purchased credit-impaired (PCI) | Credit Suisse |  |  |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |  |  |
Credit loss expense / (release) | $ 19 |  |  |  |  |  |

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