Related parties (Narrative) (Detail) SFr in Millions, $ in Millions	12 Months Ended
Dec. 31, 2021 CHF (SFr)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 CHF (SFr)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 CHF (SFr)	Dec. 31, 2019 USD ($)
Entity [Table]
Payments to external board members	SFr 6.9	$ 7.5	SFr 6.6	$ 7.0	SFr 7.3	$ 7.3
UBS AG
Entity [Table]
Payments to external board members	SFr 6.9	$ 7.5	SFr 6.6	$ 7.0	SFr 7.3	$ 7.3

The amount of remuneration paid or payable to the entity's directors.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2021-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2021-03-24

Name:	ifrs-full_DirectorsRemunerationExpense
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration