Interest rate benchmark reform (Narrative) (Detail) $ in Billions	Dec. 31, 2021 USD ($)
Entity [Table]
Mortgages linked to CHF LIBOR	$ 21
JPY and USD benchmark bonds resettable to LIBOR	3
Multicurrency Loan Commitments	5
UBS AG [Member]
Entity [Table]
Mortgages linked to CHF LIBOR	21
JPY and USD benchmark bonds resettable to LIBOR	3
Multicurrency Loan Commitments	$ 5

The amount of JPY and USD benchmark bonds resettable to LIBOR, if not called.

No definition available.

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