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Expected credit loss measurement - ECL for the period (Narrative) (Detail 1) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |
Credit loss expense / (release) | $ (80) | $ (28) | $ 272 | $ (108) | $ 540
Personal & Corporate Banking |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |
Credit loss expense / (release) | (46) |  |  | (69) | 187
Global Wealth Management |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |
Credit loss expense / (release) | (14) |  |  | (16) | 117
Investment Bank |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |
Credit loss expense / (release) | (21) |  |  | (23) | 200
Group Functions |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |
Credit loss expense / (release) | 1 |  |  | $ 1 | $ 35
Positions that are not credit impaired |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |
Credit loss expense / (release) | (88) |  |  |  |
Positions that are not credit impaired | Post-model expense adjustment updates |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |
Credit loss expense / (release) | (91) |  |  |  |
Positions that are not credit impaired | Scenario-driven model output effects - cumulative |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |
Credit loss expense / (release) | (273) |  |  |  |
Positions that are not credit impaired | Scenario-driven model output effects - retained |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |
Credit loss expense / (release) | (183) |  |  |  |
Positions that are not credit impaired | Personal & Corporate Banking |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |
Credit loss expense / (release) | (51) |  |  |  |
Positions that are not credit impaired | Global Wealth Management |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |
Credit loss expense / (release) | (13) |  |  |  |
Positions that are not credit impaired | Investment Bank |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |
Credit loss expense / (release) | (24) |  |  |  |
Positions that are not credit impaired | Group Functions |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |
Credit loss expense / (release) | 1 |  |  |  |
Credit-impaired positions |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |
Credit loss expense / (release) | 8 |  |  |  |
Credit-impaired positions | Personal & Corporate Banking |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |
Credit loss expense / (release) | 5 |  |  |  |
Credit-impaired positions | Global Wealth Management |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |
Credit loss expense / (release) | 0 |  |  |  |
Credit-impaired positions | Investment Bank |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |
Credit loss expense / (release) | 3 |  |  |  |
Credit-impaired positions | Group Functions |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |
Credit loss expense / (release) | $ 0 |  |  |  |

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- Definition The amount of impairment loss, impairment gain or reversal of impairment loss that is recognised in profit or loss in accordance with paragraph 5.5.8 of IFRS 9 and that arises from applying the impairment requirements in Section 5.5 of IFRS 9. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 82 -Subparagraph ba -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_82_ba&doctype=Standard -URIDate 2020-01-01 + Details
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