Funding from Group and other subsidiaries (Detail) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Funding From Group And Other Subsidiaries [Line Items]
Senior unsecured debt that contributes to total loss-absorbing capacity (TLAC)	$ 4,629	$ 1,959
High-trigger loss-absorbing additional tier 1 capital instruments	10,744	9,882
Low-trigger loss-absorbing additional tier 1 capital instruments	$ 1,214	$ 1,189

The amount of total loss-absorbing capacity (TLAC)-eligible senior unsecured debt designated at fair value included in gone concern loss-absorbing capacity.

No definition available.

Name:	ubs_TLACEligibleSeniorUnsecuredDebtInstrumentsAtFairValueInGoneConcernLossAbsorbingCapacity
Namespace Prefix:	ubs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant