MD&A - Risk management and control - Market Risk (Narrative) (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Entity [Table]
Confidence level applied for calculating VaR for internal management purpose	95.00%
Confidence level applied for calculating regulatory VaR	99.00%
Confidence level applied for calculating SVaR	99.00%
Total effect of economic value of equity for equity, goodwill and real estate	$ 19.6	$ 22.1
Equity instruments held as financial assets at fair value not held for trading and as investments in associates	3,000.0
Equity instruments held as financial assets at fair value not held for trading	1,900.0
Investments in associates	1,101.0	1,243.0	$ 1,557.0
+1 bp
Entity [Table]
Total effect on economic value of equity as per Pillar 3 requirement	$ (25.0)	(29.9)
Parallel up
Entity [Table]
Regulatory Threshold For Outlier Test Of Tier 1 Capital	15.00%
Total effect on economic value of equity as per Pillar 3 requirement	$ (4,600.0)	(6,000.0)
Change in tier 1 capital instruments, immediate effect	$ (400.0)	$ (1,100.0)
Percentage change in tier 1 capital instruments	7.90%	10.00%
Percentage change in tier 1 capital instruments, immediate effect	0.60%	1.80%
USD
Entity [Table]
Total effect of economic value of equity for equity, goodwill and real estate	$ 14.0	$ 15.6
CHF
Entity [Table]
Total effect of economic value of equity for equity, goodwill and real estate	$ 4.8	5.5
UBS AG
Entity [Table]
Confidence level applied for calculating VaR for internal management purpose	95.00%
Confidence level applied for calculating regulatory VaR	99.00%
Confidence level applied for calculating SVaR	99.00%
Total effect of economic value of equity for equity, goodwill and real estate	$ 19.6	22.1
Equity instruments held as financial assets at fair value not held for trading and as investments in associates	3,000.0
Equity instruments held as financial assets at fair value not held for trading	1,900.0
Investments in associates	1,101.0	1,243.0	$ 1,557.0
UBS AG \| +1 bp
Entity [Table]
Total effect on economic value of equity as per Pillar 3 requirement	$ (25.0)	(29.9)
UBS AG \| Parallel up
Entity [Table]
Regulatory Threshold For Outlier Test Of Tier 1 Capital	15.00%
Total effect on economic value of equity as per Pillar 3 requirement	$ (4,600.0)	(6,000.0)
Change in tier 1 capital instruments, immediate effect	$ (400.0)	$ (1,100.0)
Percentage change in tier 1 capital instruments	7.90%	10.00%
Percentage change in tier 1 capital instruments, immediate effect	0.60%	1.80%
UBS AG \| USD
Entity [Table]
Total effect of economic value of equity for equity, goodwill and real estate	$ 14.0	$ 15.6
UBS AG \| CHF
Entity [Table]
Total effect of economic value of equity for equity, goodwill and real estate	$ 4.8	$ 5.5

The amount of investments accounted for using the equity method. The equity method is a method of accounting whereby the investment is initially recognised at cost and adjusted thereafter for the post-acquisition change in the investor's share of net assets of the investee. The investor's profit or loss includes its share of the profit or loss of the investee. The investor's other comprehensive income includes its share of the other comprehensive income of the investee. [Refer: At cost [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 8
-IssueDate 2021-01-01
-Paragraph 24
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2021-en-r&anchor=para_24_a&doctype=Standard
-URIDate 2021-03-24

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2021-01-01
-Paragraph B16
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2021-en-r&anchor=para_B16&doctype=Appendix&subtype=B
-URIDate 2021-03-24

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2021-01-01
-Paragraph 54
-Subparagraph e
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_54_e&doctype=Standard
-URIDate 2021-03-24

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The percentage of confidence level applied for calculating value-at-risk (VaR) for internal management purpose.

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The amount of equity instruments held as financial assets at fair value not held for trading.

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The amount of equity instruments held as financial assets at fair value not held for trading and as investments in associates.

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The amount of increase (decrease) in economic value of equity excluding AT1 capital instruments as per FINMA Pillar 3 disclosure requirement.

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