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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>

X

- 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

X

- 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

X

- 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

X

- 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

X

- 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

X

- 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

X

- 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

X

- References

No definition available.

+ Details

Name:	ubs_IssuedDebtInstrumentsAbstract
Namespace Prefix:	ubs_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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

X

- 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

X

- 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

X

- 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