Label	Element	Value
UBS Municipal Bond Fund
Risk/Return:	rr_RiskReturnAbstract
Supplement [Text Block]	ck0000886244_SupplementTextBlock	The UBS Funds UBS Municipal Bond Fund Prospectus Supplement April 5, 2016 Dear Investor, The purpose of this supplement to the Prospectus of the UBS Municipal Bond Fund series (the "Fund") of The UBS Funds dated October 28, 2015, as supplemented, is to provide you with updated information regarding the Fund. Effective June 1, 2016, the Prospectus is hereby supplemented accordingly as shown below.
Risk/Return [Heading]	rr_RiskReturnHeading	UBS Municipal Bond Fund
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	The section captioned “Fees and expenses” and sub-captioned “Annual fund operating expenses” on page 13 of the Prospectus is revised by replacing footnote 1 to the fee table in its entirety with the following: Purchases of $500,000 or more that were not subject to a front-end sales charge are subject to a 0.75% CDSC if sold within one year of the purchase date. PLEASE BE SURE TO RETAIN THIS IMPORTANT INFORMATION FOR FUTURE REFERENCE.
Expenses Deferred Charges [Text Block]	rr_ExpensesDeferredChargesTextBlock	Purchases of $500,000 or more that were not subject to a front-end sales charge are subject to a 0.75% CDSC if sold within one year of the purchase date.

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Supplement [Text Block]

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The UBS Funds

UBS Municipal Bond Fund

Prospectus Supplement

April 5, 2016

Dear Investor,

The purpose of this supplement to the Prospectus of the UBS Municipal Bond Fund series (the "Fund") of The UBS Funds dated October 28, 2015, as supplemented, is to provide you with updated information regarding the Fund.

Effective June 1, 2016, the Prospectus is hereby supplemented accordingly as shown below.

Risk/Return [Heading]

rr_RiskReturnHeading

UBS Municipal Bond Fund

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The section captioned “Fees and expenses” and sub-captioned “Annual fund operating expenses” on page 13 of the Prospectus is revised by replacing footnote 1 to the fee table in its entirety with the following:

Purchases of $500,000 or more that were not subject to a front-end sales charge are subject to a 0.75% CDSC if sold within one year of the purchase date.

PLEASE BE SURE TO RETAIN THIS IMPORTANT INFORMATION FOR FUTURE REFERENCE.

Expenses Deferred Charges [Text Block]

rr_ExpensesDeferredChargesTextBlock

Purchases of $500,000 or more that were not subject to a front-end sales charge are subject to a 0.75% CDSC if sold within one year of the purchase date.