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Expected credit loss measurement - ECL for the period (Detail) - 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)
Asset Management |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |
Credit loss (expense) / release | 0 |  |  | 0 | 0
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 | 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 | Asset Management |  |  |  |  |
Disclosure Of Provision Matrix [Line Items] |  |  |  |  |
Credit loss (expense) / release | 0 |  |  |  |
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 | Asset 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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