Employee benefits: variable compensation (Narrative) (Detail 1)		12 Months Ended
Jun. 12, 2023	Dec. 31, 2023 d shares	Dec. 31, 2022 shares
Equity Participation And Other Compensation Plans [Line Items]
Share delivery obligations		196,000,000	178,000,000
Treasury shares available to satisfy share delivery obligations		131,000,000	119,000,000
Credit Suisse
Equity Participation And Other Compensation Plans [Line Items]
Percentage of retention awards offered in cash	50.00%	50.00%
Vesting requirement for payment arrangement	60	60
Percentage of retention awards offered in shares	50.00%	50.00%
Acquiree shares exchanged for 1 acquirer share		22.48
Deferred Contingent Capital Plan
Equity Participation And Other Compensation Plans [Line Items]
Percentage of awards that GEB members forfeit for each year during the vesting period in which UBS does not achieve an adjusted profit before tax		20.00%

The amount of shares of the acquiree in exchange of 1 new share issued by the acquirer.

No definition available.

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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- Definition

The percentage of retention awards to be delivered in cash, offered to Credit Suisse Group personnel.

+ References

No definition available.

+ Details

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- Definition

The percentage of awards that GEB members forfeit for each year during the vesting period in which UBS does not achieve an adjusted profit before tax.

+ References

No definition available.

+ Details

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- Definition

The percentage of retention awards to be delivered in shares, offered to Credit Suisse Group personnel.

+ References

No definition available.

+ Details

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- Definition

The number of unvested shares that validly exist and are outstanding as of the balance sheet date, which is calculated on the basis of unvested notional share awards, options and stock appreciation rights, taking applicable performance conditions into account.

+ References

No definition available.

+ Details

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- Definition

The number of treasury shares that were available to satisfy share delivery obligations.

+ References

No definition available.

+ Details

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Data Type:	xbrli:sharesItemType
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- Definition

The vesting period for retention awards offered in cash to Credit Suisse Group personnel.

+ References

No definition available.

+ Details

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- Details

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- Details

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