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Interest rate benchmark reform (Narrative) (Detail) - USD ($) $ in Billions | Jun. 30, 2023 | Dec. 31, 2022
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Disclosure Of Maximum Exposure To Interest Rate Benchmark Reform [Line Items] |  |
US mortgages linked to USD LIBOR |  | $ 9
Corporate loans subject to interest rate benchmark reform | $ 2 |
Yen, pounds, sterling and US dollar denominated publicly issued benchmark bonds | 6 |
Credit Suisse |  |
Disclosure Of Maximum Exposure To Interest Rate Benchmark Reform [Line Items] |  |
Yen, pounds, sterling and US dollar denominated publicly issued benchmark notes | $ 3 |

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- Definition The amount of corporate loans in the UBS Investment Bank, Credit Suisse Investment Bank and Credit Suisse Wealth Management, subject to interest rate benchmark reform. + References No definition available. + Details
Name: | ubs_CorporateLoansSubjectToInterestRateBenchmarkReform
Namespace Prefix: | ubs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
Name: | ubs_DisclosureOfMaximumExposureToInterestRateBenchmarkReformLineItems
Namespace Prefix: | ubs_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of JPY, GBP and USD benchmark bonds resettable to LIBOR, if not called. + References No definition available. + Details
Name: | ubs_JPYAndGBPAndUSDBenchmarkBondsResettableToLIBOR
Namespace Prefix: | ubs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of JPY, GBP and USD benchmark note resettable to LIBOR, if not called, assumed by UBS Group AG as a result of the acquisition of the Credit Suisse Group. + References No definition available. + Details
Name: | ubs_JPYAndGBPAndUSDBenchmarkNotesResettableToLIBORAssumedByUBS
Namespace Prefix: | ubs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of US mortgages linked to USD LIBOR. + References No definition available. + Details
Name: | ubs_USMortgagesLinkedToUSDLIBOR
Namespace Prefix: | ubs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | ifrs-full_BusinessCombinationsAxis=ubs_CreditSuisseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |