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Class P2 Prospectus | UBS International Sustainable Equity Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement to Prospectus [Text Block] rr_SupplementToProspectusTextBlock

The UBS Funds

Prospectus Supplement | October 2, 2023

Includes:

•  UBS International Sustainable Equity Fund

Dear Investor,

The purpose of this supplement is to update the information in the Prospectus relating to Class P2 shares, dated October 28, 2022, as supplemented, for UBS International Sustainable Equity Fund (the "Fund"), a series of The UBS Funds, as follows:
Risk/Return [Heading] rr_RiskReturnHeading UBS International Sustainable Equity Fund
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

Effective October 1, 2023, the Fund's primary benchmark changed from the MSCI All Country World ("ACWI") ex-US Index to the MSCI World ex-US Index.

Therefore, the information under the heading "UBS International Sustainable Equity Fund-Fund Summary" and the sub-heading "Average annual total returns" is deleted in its entirety and replaced with the following:
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective October 1, 2023, the MSCI World ex-US Index replaced the MSCI ACWI ex-US Index as the Fund's benchmark because it more closely aligns with the Fund's investment strategy.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock

PLEASE BE SURE TO RETAIN THIS IMPORTANT INFORMATION FOR FUTURE REFERENCE.
Average Annual Return, Caption rr_AverageAnnualReturnCaption Average annual total returns (figures reflect sales charges) (for the periods ended December 31, 2021)
Class P2 Prospectus | UBS International Sustainable Equity Fund | MSCI ACWI ex-US Index  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 7.82% [1]
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 24.27% [1]
Class P2 Prospectus | UBS International Sustainable Equity Fund | MSCI World ex-US Index  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 12.62% [1]
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 30.00% [1]
Class P2 Prospectus | UBS International Sustainable Equity Fund | Class P2  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 4.14%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 20.34%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Oct. 30, 2020
Class P2 Prospectus | UBS International Sustainable Equity Fund | Class P2 | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 1.76%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 17.75%
Class P2 Prospectus | UBS International Sustainable Equity Fund | Class P2 | After Taxes on Distributions and Sale of Fund Shares  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 4.22%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 15.62%
[1] Effective October 1, 2023, the MSCI World ex-US Index replaced the MSCI ACWI ex-US Index as the Fund's benchmark because it more closely aligns with the Fund's investment strategy.