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Class A & P 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 A and Class P 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 A & P 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, 5 Years rr_AverageAnnualReturnYear05 9.61% [1]
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 7.28% [1]
Class A & P 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, 5 Years rr_AverageAnnualReturnYear05 9.63% [1]
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 7.84% [1]
Class A & P Prospectus | UBS International Sustainable Equity Fund | CLASS A  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (2.59%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 7.87%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 7.45%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Jun. 30, 1997
Class A & P Prospectus | UBS International Sustainable Equity Fund | CLASS P  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 3.34%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 9.36%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 8.33%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Aug. 31, 1993
Class A & P Prospectus | UBS International Sustainable Equity Fund | CLASS P | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 1.17%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 8.69%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 7.74%
Class A & P Prospectus | UBS International Sustainable Equity Fund | CLASS P | After Taxes on Distributions and Sale of Fund Shares  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 3.61%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 7.48%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 6.78%
[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.