Consolidated Statement of Changes in Equity (Parenthetical) $ in Millions	Dec. 31, 2018 USD ($)
Effect of adoption of IFRIC 23	$ (11)
Retained earnings
Effect of adoption of IFRIC 23	(11)
Total equity attributable to shareholders
Effect of adoption of IFRIC 23	$ (11)

The amount of adjustments to equity due to adoption of IFRIC 23.

No definition available.

Name:	ubs_AdjustmentsToEquityDueToAdoptionOfIFRIC23
Namespace Prefix:	ubs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration