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Debt issued designated at fair value (Detail) - USD ($) $ in Millions | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Issued debt instruments |  |  |  |
Equity-linked | [1] | $ 49,157 | $ 44,615 | $ 41,069
Rates-linked |  | 16,397 | 12,668 | 11,038
Credit-linked |  | 1,826 | 1,804 | 1,933
Fixed-rate |  | 2,883 | 3,343 | 3,604
Commodity-linked |  | 1,961 | 1,564 | 1,497
Other |  | 2,841 | 2,540 | 2,101
of which: debt that contributes to total loss-absorbing capacity |  | 2,112 | 1,676 | 1,190
Total debt issued designated at fair value |  | 75,065 | 66,535 | 61,243
of which: issued by UBS AG with original maturity greater than one year |  | 51,830 | 47,348 | 46,427
of which: life-to-date own credit (gain) / loss |  | $ 317 | $ 424 | $ 418
Unsecured portion of debt instruments issued by UBS AG with original maturity greater than one year |  | 99.00% | 100.00% | 100.00%
[1] | <div>Includes investment fund unit-linked instruments issued</div>

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- Definition The amount of commodity-linked debt instruments that have been issued and are designated at fair value. + References No definition available. + Details
Name: | ubs_CommodityLinkedIssuedDebtInstrumentsDesignatedAtFairValueThroughProfitOrLoss
Namespace Prefix: | ubs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of credit-linked debt instruments that have been issued and are designated at fair value. + References No definition available. + Details
Name: | ubs_CreditLinkedIssuedDebtInstrumentsDesignatedAtFairValueThroughProfitOrLoss
Namespace Prefix: | ubs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of all types of debt instruments that have been issued by UBS AG and are designated at fair value, with original maturity greater than one year. + References No definition available. + Details
Name: | ubs_DebtInstrumentsIssuedByUBSAGDesignatedAtFairValueThroughProfitOrLossWithMaturityGreaterThanOneYear
Namespace Prefix: | ubs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The percentage of unsecured debt instruments that have been issued by UBS AG and are designated at fair value, with original maturity greater than one year. + References No definition available. + Details
Name: | ubs_DebtInstrumentsIssuedByUBSAGDesignatedAtFairValueThroughProfitOrLossWithMaturityGreaterThanOneYearUnsecuredPortion
Namespace Prefix: | ubs_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition The amount of debt issued designated at fair value. + References No definition available. + Details
Name: | ubs_DebtSecuritiesIssuedAtFairValueThroughProfitOrLossDesignatedAsUponInitialRecognition
Namespace Prefix: | ubs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of equity-linked debt instruments that have been issued and are designated at fair value. + References No definition available. + Details
Name: | ubs_EquityLinkedIssuedDebtInstrumentsDesignatedAtFairValueThroughProfitOrLoss
Namespace Prefix: | ubs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of fixed-rate debt instruments that have been issued and are designated at fair value. + References No definition available. + Details
Name: | ubs_FixedRateIssuedDebtInstrumentsDesignatedAtFairValueThroughProfitOrLoss
Namespace Prefix: | ubs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Definition The amount of life-to-credit own credit (gain) / loss of financial liabilities at fair value through profit or loss that were designated as such upon initial recognition or subsequently. A negative value refers to life-to-date gain whereas a positive value refers to life-to-date loss. + References No definition available. + Details
Name: | ubs_LifeToDateChangeInFairValueOfFinancialLiabilityAttributableToChangeInCreditRiskOfLiabilityIssuedDebt
Namespace Prefix: | ubs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The amount of other miscellaneous debt instruments that have been issued and are designated at fair value. + References No definition available. + Details
Name: | ubs_OtherIssuedDebtInstrumentsDesignatedAtFairValueThroughProfitOrLoss
Namespace Prefix: | ubs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of rates-linked debt instruments that have been issued and are designated at fair value. + References No definition available. + Details
Name: | ubs_RatesLinkedIssuedDebtInstrumentsDesignatedAtFairValueThroughProfitOrLoss
Namespace Prefix: | ubs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of total loss-absorbing capacity (TLAC)-eligible senior unsecured debt designated at fair value included in gone concern loss-absorbing capacity. + References No definition available. + Details
Name: | ubs_TLACEligibleSeniorUnsecuredDebtInstrumentsAtFairValueInGoneConcernLossAbsorbingCapacity
Namespace Prefix: | ubs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant