Supplemental guarantor information (Narrative) (Detail) - UBS AG $ in Billions	12 Months Ended
Dec. 31, 2022 USD ($)
Entity [Table]
Joint and several liability	$ 4.3
Increase decrease in joint and several liability	$ (1.4)

The joint liability for contractual obligations of UBS AG decreased by.

No definition available.

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