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Consolidated Statement of Changes in Equity (Parenthetical) - $ / shares	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Ordinary cash dividends paid, ordinary shares per share	$ 0.37
Ordinary cash dividends paid, ordinary shares per share, first tranche	0.365	$ 0.365
Ordinary cash dividends paid, ordinary shares per share, second tranche	$ 0.365	$ 0.365
Maximum percentage of dividends that may be paid from capital contribution reserves	50.00%
Own shares purchased and cancelled as part of 2018-2021 the share repurchase program	156,632,400
Minimum percentage of the total capital reduction amount exceeding the nominal value by which captal contribution reserves are reduced upon cancellation of the shares	50.00%

X

- Definition

The amount of dividends paid per ordinary share.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 34
-IssueDate 2020-01-01
-Paragraph 16A
-Subparagraph f
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=34&code=ifrs-tx-2020-en-r&anchor=para_16A_f&doctype=Standard
-URIDate 2020-01-01

+ Details

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Namespace Prefix:	ifrs-full_
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Balance Type:	na
Period Type:	duration

X

- Definition

The amount of dividends paid per ordinary share, first tranche.

+ References

No definition available.

+ Details

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Namespace Prefix:	ubs_
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Period Type:	duration

X

- Definition

The amount of dividends paid per ordinary share, second tranche.

+ References

No definition available.

+ Details

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Namespace Prefix:	ubs_
Data Type:	num:perShareItemType
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X

- Definition

The maximum percentage of dividends that may be paid from capital contribution reserves under Swiss tax law.

+ References

No definition available.

+ Details

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Namespace Prefix:	ubs_
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X

- Definition

The minimum percentage of the total capital reduction amount exceeding the nominal value by which captal contribution reserves are reduced upon cancellateion of the shares under Swiss tax law.

+ References

No definition available.

+ Details

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Namespace Prefix:	ubs_
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Balance Type:	na
Period Type:	duration

X

- Definition

Number of own shares that have been repurchased and subsequently cancelled as part of 2018-2021 share repurchase program.

+ References

No definition available.

+ Details

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Namespace Prefix:	ubs_
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Period Type:	duration