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FVM - Valuation adjustments reserves on the balance sheet (Detail) - USD ($) $ in Millions | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022
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Valuation Adjustment Reserves On The Balance Sheet [Line Items] |  |  |
Own credit adjustments on financial liabilities designated at fair value | $ 142 | $ 624 | $ 556
of which: debt issued designated at fair value | 46 | 495 | 453
of which: other financial liabilities designated at fair value | 96 | 129 | 103
Credit valuation adjustments | (151) | (33) | (33)
Funding / Debit valuation adjustments | (172) | (101) | (46)
Other valuation adjustments | (2,911) | (801) | (839)
of which: liquidity | (1,905) | (299) | (311)
of which: model uncertainty | (1,005) | $ (502) | $ (529)
Credit Suisse |  |  |
Valuation Adjustment Reserves On The Balance Sheet [Line Items] |  |  |
Own credit adjustments on financial liabilities designated at fair value | (221) |  |
Credit valuation adjustments | 117 |  |
Funding / Debit valuation adjustments | 73 |  |
of which: liquidity | 1,630 |  |
of which: model uncertainty | $ 555 |  |

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- Definition A component of equity representing the accumulated change in fair value of financial liabilities attributable to change in the credit risk of the liabilities. [Refer: Credit risk [member]; Financial liabilities] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 78 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_78_e&doctype=Standard -URIDate 2022-03-24 + Details
Name: | ifrs-full_ReserveOfChangeInFairValueOfFinancialLiabilityAttributableToChangeInCreditRiskOfLiability
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of valuation adjustments made on financial instruments which represents the estimated fair value of protection required to hedge the counterparty credit risk of OTC derivative instruments, including funded derivative instruments that are classified as Financial assets at fair value not held for trading. + References No definition available. + Details
Name: | ubs_CreditValuationAdjustments
Namespace Prefix: | ubs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of valuation adjustments made on financial instruments which reflect the costs and benefits of funding associated with uncollateralized and partially collateralized derivative receivables and payables, and adjustment made to the measurement of derivative liabilities to reflect the own credit risk of the entity. + References No definition available. + Details
Name: | ubs_FundingAndDebitValuationAdjustments
Namespace Prefix: | ubs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of valuation adjustments made on financial instruments relating to liquidity. + References No definition available. + Details
Name: | ubs_LiquidityValuationAdjustments
Namespace Prefix: | ubs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of valuation adjustments made on financial instruments relating to model uncertainty. + References No definition available. + Details
Name: | ubs_ModelUncertaintyValuationAdjustments
Namespace Prefix: | ubs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of other valuation adjustments made on financial instruments. + References No definition available. + Details
Name: | ubs_OtherValuationAdjustments
Namespace Prefix: | ubs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition A component of equity representing the accumulated change in fair value of debt issued designated at fair value attributable to change in the credit risk of the liabilities. + References No definition available. + Details
Name: | ubs_Reserveofchangeinfairvalueoffinancialliabilityattributabletochangeincreditriskofliabilitydebtissueddesignatedatfairvalue
Namespace Prefix: | ubs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition A component of equity representing the accumulated change in fair value of other financial liabilities designated at fair value attributable to change in the credit risk of the liabilities. + References No definition available. + Details
Name: | ubs_Reserveofchangeinfairvalueoffinancialliabilityattributabletochangeincreditriskofliabilityotherfinancialliabilitiesdesignatedatfairvalue
Namespace Prefix: | ubs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | ubs_ValuationAdjustmentReservesOnTheBalanceSheetLineItems
Namespace Prefix: | ubs_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_ConsolidatedEntitiesAxis=ubs_CreditSuisseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |