Fair value measurement (Narrative) (Detail) $ in Millions	12 Months Ended
Dec. 31, 2021 USD ($)
Entity [Table]
Other net income from financial instruments measured at fair value through profit or loss, swaps portfolio close	$ (861)
UBS AG
Entity [Table]
Other net income from financial instruments measured at fair value through profit or loss, swaps portfolio close	$ (861)

The amount of other net income from financial instruments measured at fair value through profit or loss, as a result of closing out a portfolio of swaps, following the client's defult.

No definition available.

Name:	ubs_OtherNetIncomeFromFinancialInstrumentsMeasuredAtFairValueThroughProfitOrLossSwapsPortfolio
Namespace Prefix:	ubs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration