Fidelity Union Street Trust N-CSR23 Oct 24Certified annual shareholder report (management investment company)Financial data

Company Profile

Form N-CSR Cover

Form N-CSR Cover	12 Months Ended
Form N-CSR Cover	Aug. 31, 2024
Shareholder Report [Line Items]
Document Type	N-CSR
Amendment Flag	false
Registrant Name	Fidelity Union Street Trust
Entity Central Index Key	0000035330
Entity Investment Company Type	N-1A
Document Period End Date	Aug. 31, 2024

Shareholder Report

Shareholder Report	12 Months Ended
Shareholder Report	Aug. 31, 2024 USD ($) shares
Shareholder Report [Line Items]
Document Type	N-CSR
Amendment Flag	false
Registrant Name	Fidelity Union Street Trust
Entity Central Index Key	0000035330
Entity Investment Company Type	N-1A
Document Period End Date	Aug. 31, 2024
Fidelity Arizona Municipal Income Fund
Shareholder Report [Line Items]
Fund Name	Fidelity® Arizona Municipal Income Fund
Class Name	Fidelity® Arizona Municipal Income Fund
Trading Symbol	FSAZX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains information about Fidelity® Arizona Municipal Income Fund for the period September 1, 2023 to August 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number	1-800-544-8544
Additional Information Email	fidfunddocuments@fidelity.com
Additional Information Website	fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block]	What were your Fund costs for the last year? (based on hypothetical $10,000 investment) FUND COST (PREVIOUS YEAR) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Fidelity® Arizona Municipal Income Fund $ 0.55 %
Expenses Paid, Amount	$ 57
Expense Ratio, Percent	0.55%
Factors Affecting Performance [Text Block]	What affected the Fund's performance this period? • • • • • • •
Performance Past Does Not Indicate Future [Text]	The Fund's past performance is not a good predictor of the Fund's future performance.</span>" id="sjs-B25"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span>
Line Graph [Table Text Block]	How did the Fund perform over the past 10 years? CUMULATIVE PERFORMANCE August 31, 2014 through August 31, 2024. Initial investment of $10,000. Fidelity® Arizona Municipal Income Fund $10,000 $10,328 $11,052 $11,099 $11,094 $12,044 $12,324 $12,727 $11,573 $11,749 $12,546 Bloomberg Arizona 2+ Year Enhanced Municipal Linked Index $10,000 $10,319 $11,078 $11,215 $11,228 $12,206 $12,602 $12,985 $11,885 $12,017 $12,736 Bloomberg Municipal Bond Index $10,000 $10,252 $10,958 $11,054 $11,108 $12,077 $12,468 $12,891 $11,778 $11,979 $12,708 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year 10 Year Fidelity® Arizona Municipal Income Fund 6.78% 0.82% 2.29% Bloomberg Arizona 2+ Year Enhanced Municipal Linked Index 5.99% 0.85% 2.45% Bloomberg Municipal Bond Index 6.09% 1.02% 2.43% Visit www.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
Net Assets	$ 122,357,798
Holdings Count \| shares	113
Advisory Fees Paid, Amount	$ 666,316
Investment Company Portfolio Turnover	7%
Additional Fund Statistics [Text Block]	Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 113 Total Advisory Fee $ Portfolio Turnover 7 %
Holdings [Text Block]	REVENUE SOURCES (% of Fund's net assets) Health Care 28.5 Education 18.4 General Obligations 13.9 Transportation 10.0 Special Tax 9.0 Water & Sewer 5.8 State G.O. 5.3 Others(Individually Less Than 5%) 9.1 100.0 AAA 2.2 AA 50.2 A 32.9 BBB 6.4 B 0.4 Not Rated 4.6 Short-Term Investments and Net Other Assets (Liabilities) 3.3 QUALITY DIVERSIFICATION (% of Fund's net assets) We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.
Fidelity Maryland Municipal Income Fund
Shareholder Report [Line Items]
Fund Name	Fidelity® Maryland Municipal Income Fund
Class Name	Fidelity® Maryland Municipal Income Fund
Trading Symbol	SMDMX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains information about Fidelity® Maryland Municipal Income Fund for the period September 1, 2023 to August 31, 2024.
Shareholder Report Annual or Semi-Annual	annual shareholder report
Additional Information [Text Block]	You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number	1-800-544-8544
Additional Information Email	fidfunddocuments@fidelity.com
Additional Information Website	fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block]	What were your Fund costs for the last year? (based on hypothetical $10,000 investment) FUND COST (PREVIOUS YEAR) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Fidelity® Maryland Municipal Income Fund $ 0.55 %
Expenses Paid, Amount	$ 57
Expense Ratio, Percent	0.55%
Factors Affecting Performance [Text Block]	What affected the Fund's performance this period? • • • • • •
Performance Past Does Not Indicate Future [Text]	The Fund's past performance is not a good predictor of the Fund's future performance.</span>" id="sjs-B50"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span>
Line Graph [Table Text Block]	How did the Fund perform over the past 10 years? CUMULATIVE PERFORMANCE August 31, 2014 through August 31, 2024. Initial investment of $10,000. Fidelity® Maryland Municipal Income Fund $10,000 $10,266 $10,983 $11,019 $11,001 $11,934 $12,107 $12,601 $11,448 $11,624 $12,347 Bloomberg Maryland 2+ Year Enhanced Municipal Linked Index $10,000 $10,271 $11,044 $11,147 $11,128 $12,076 $12,536 $12,824 $11,742 $11,850 $12,505 Bloomberg Municipal Bond Index $10,000 $10,252 $10,958 $11,054 $11,108 $12,077 $12,468 $12,891 $11,778 $11,979 $12,708 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024
Average Annual Return [Table Text Block]	AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year 10 Year Fidelity® Maryland Municipal Income Fund 6.22% 0.68% 2.13% Bloomberg Maryland 2+ Year Enhanced Municipal Linked Index 5.53% 0.70% 2.26% Bloomberg Municipal Bond Index 6.09% 1.02% 2.43% Visit www.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
No Deduction of Taxes [Text Block]	The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
Net Assets	$ 164,184,901
Holdings Count \| shares	131
Advisory Fees Paid, Amount	$ 936,180
Investment Company Portfolio Turnover	15%
Additional Fund Statistics [Text Block]	Key Fund Statistics (as of August 31, 2024) KEY FACTS Fund Size $ Number of Holdings 131 Total Advisory Fee $ Portfolio Turnover 15 %
Holdings [Text Block]	REVENUE SOURCES (% of Fund's net assets) Health Care 25.4 General Obligations 23.2 Special Tax 12.4 Transportation 9.7 Water & Sewer 7.8 Education 7.7 Housing 6.7 Others(Individually Less Than 5%) 7.1 100.0 AAA 15.1 AA 30.0 A 24.7 BBB 14.6 B 0.9 Not Rated 8.1 Short-Term Investments and Net Other Assets (Liabilities) 6.6 QUALITY DIVERSIFICATION (% of Fund's net assets) We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.

Shareholder Report, Line Graph

Shareholder Report, Line Graph (Details) - USD ($)

12 Months Ended

60 Months Ended

120 Months Ended

132 Months Ended

Aug. 31, 2024

Aug. 31, 2023

Aug. 31, 2022

Aug. 31, 2021

Aug. 31, 2020

Aug. 31, 2019

Aug. 31, 2018

Aug. 31, 2017

Aug. 31, 2016

Aug. 31, 2015

Aug. 31, 2014

C000020471_1_BBIndexMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

6.09%

C000020471_1_BBIndexMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

1.02%

C000020471_1_BBIndexMember_10YRMember

Account Value [Line Items]

Average Annual Return, Percent

2.43%

C000020473_1_BBIndexMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

6.09%

C000020473_1_BBIndexMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

1.02%

C000020473_1_BBIndexMember_10YRMember

Account Value [Line Items]

Average Annual Return, Percent

2.43%

C000020471_LG_ClassMember_11YRMember

Account Value [Line Items]

Line Graph and Table Measure Name

Fidelity® Arizona Municipal Income Fund" id="sjs-E23">Fidelity® Arizona Municipal Income Fund

C000020471_ClassMember_AsOf_2014Member

Account Value [Line Items]

Account Value

$ 10,000

C000020471_ClassMember_AsOf_2015Member

Account Value [Line Items]

Account Value

$ 10,328

C000020471_ClassMember_AsOf_2016Member

Account Value [Line Items]

Account Value

$ 11,052

C000020471_ClassMember_AsOf_2017Member

Account Value [Line Items]

Account Value

$ 11,099

C000020471_ClassMember_AsOf_2018Member

Account Value [Line Items]

Account Value

$ 11,094

C000020471_ClassMember_AsOf_2019Member

Account Value [Line Items]

Account Value

$ 12,044

C000020471_ClassMember_AsOf_2020Member

Account Value [Line Items]

Account Value

$ 12,324

C000020471_ClassMember_AsOf_2021Member

Account Value [Line Items]

Account Value

$ 12,727

C000020471_ClassMember_AsOf_2022Member

Account Value [Line Items]

Account Value

$ 11,573

C000020471_ClassMember_AsOf_2023Member

Account Value [Line Items]

Account Value

$ 11,749

C000020471_ClassMember_AsOf_2024Member

Account Value [Line Items]

Account Value

$ 12,546

C000020471_LG_1_AdditionalIndexMember_11YRMember

Account Value [Line Items]

Line Graph and Table Measure Name

Bloomberg Arizona 2+ Year Enhanced Municipal Linked Index" id="sjs-E59">Bloomberg Arizona 2+ Year Enhanced Municipal Linked Index

C000020471_1_AdditionalIndexMember_AsOf_2014Member

Account Value [Line Items]

Account Value

10,000

C000020471_1_AdditionalIndexMember_AsOf_2015Member

Account Value [Line Items]

Account Value

10,319

C000020471_1_AdditionalIndexMember_AsOf_2016Member

Account Value [Line Items]

Account Value

11,078

C000020471_1_AdditionalIndexMember_AsOf_2017Member

Account Value [Line Items]

Account Value

11,215

C000020471_1_AdditionalIndexMember_AsOf_2018Member

Account Value [Line Items]

Account Value

11,228

C000020471_1_AdditionalIndexMember_AsOf_2019Member

Account Value [Line Items]

Account Value

12,206

C000020471_1_AdditionalIndexMember_AsOf_2020Member

Account Value [Line Items]

Account Value

12,602

C000020471_1_AdditionalIndexMember_AsOf_2021Member

Account Value [Line Items]

Account Value

12,985

C000020471_1_AdditionalIndexMember_AsOf_2022Member

Account Value [Line Items]

Account Value

11,885

C000020471_1_AdditionalIndexMember_AsOf_2023Member

Account Value [Line Items]

Account Value

12,017

C000020471_1_AdditionalIndexMember_AsOf_2024Member

Account Value [Line Items]

Account Value

12,736

$ 12,736

C000020471_LG_2_AdditionalIndexMember_11YRMember

Account Value [Line Items]

Line Graph and Table Measure Name

Bloomberg Municipal Bond Index" id="sjs-E95">Bloomberg Municipal Bond Index

C000020471_2_AdditionalIndexMember_AsOf_2014Member

Account Value [Line Items]

Account Value

10,000

C000020471_2_AdditionalIndexMember_AsOf_2015Member

Account Value [Line Items]

Account Value

10,252

C000020471_2_AdditionalIndexMember_AsOf_2016Member

Account Value [Line Items]

Account Value

10,958

C000020471_2_AdditionalIndexMember_AsOf_2017Member

Account Value [Line Items]

Account Value

11,054

C000020471_2_AdditionalIndexMember_AsOf_2018Member

Account Value [Line Items]

Account Value

11,108

C000020471_2_AdditionalIndexMember_AsOf_2019Member

Account Value [Line Items]

Account Value

12,077

C000020471_2_AdditionalIndexMember_AsOf_2020Member

Account Value [Line Items]

Account Value

12,468

C000020471_2_AdditionalIndexMember_AsOf_2021Member

Account Value [Line Items]

Account Value

12,891

C000020471_2_AdditionalIndexMember_AsOf_2022Member

Account Value [Line Items]

Account Value

11,778

C000020471_2_AdditionalIndexMember_AsOf_2023Member

Account Value [Line Items]

Account Value

11,979

C000020471_2_AdditionalIndexMember_AsOf_2024Member

Account Value [Line Items]

Account Value

$ 12,708

C000020471_NoLoadClassMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

6.78%

C000020471_NoLoadClassMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

0.82%

C000020471_NoLoadClassMember_10YRMember

Account Value [Line Items]

Average Annual Return, Percent

2.29%

C000020471_0_AdditionalIndexMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

5.99%

C000020471_0_AdditionalIndexMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

0.85%

C000020471_0_AdditionalIndexMember_10YRMember

Account Value [Line Items]

Average Annual Return, Percent

2.45%

C000020473_LG_ClassMember_11YRMember

Account Value [Line Items]

Line Graph and Table Measure Name

Fidelity® Maryland Municipal Income Fund" id="sjs-E149">Fidelity® Maryland Municipal Income Fund

C000020473_ClassMember_AsOf_2014Member

Account Value [Line Items]

Account Value

10,000

C000020473_ClassMember_AsOf_2015Member

Account Value [Line Items]

Account Value

10,266

C000020473_ClassMember_AsOf_2016Member

Account Value [Line Items]

Account Value

10,983

C000020473_ClassMember_AsOf_2017Member

Account Value [Line Items]

Account Value

11,019

C000020473_ClassMember_AsOf_2018Member

Account Value [Line Items]

Account Value

11,001

C000020473_ClassMember_AsOf_2019Member

Account Value [Line Items]

Account Value

11,934

C000020473_ClassMember_AsOf_2020Member

Account Value [Line Items]

Account Value

12,107

C000020473_ClassMember_AsOf_2021Member

Account Value [Line Items]

Account Value

12,601

C000020473_ClassMember_AsOf_2022Member

Account Value [Line Items]

Account Value

11,448

C000020473_ClassMember_AsOf_2023Member

Account Value [Line Items]

Account Value

11,624

C000020473_ClassMember_AsOf_2024Member

Account Value [Line Items]

Account Value

$ 12,347

C000020473_LG_1_AdditionalIndexMember_11YRMember

Account Value [Line Items]

Line Graph and Table Measure Name

Bloomberg Maryland 2+ Year Enhanced Municipal Linked Index" id="sjs-E185">Bloomberg Maryland 2+ Year Enhanced Municipal Linked Index

C000020473_1_AdditionalIndexMember_AsOf_2014Member

Account Value [Line Items]

Account Value

10,000

C000020473_1_AdditionalIndexMember_AsOf_2015Member

Account Value [Line Items]

Account Value

10,271

C000020473_1_AdditionalIndexMember_AsOf_2016Member

Account Value [Line Items]

Account Value

11,044

C000020473_1_AdditionalIndexMember_AsOf_2017Member

Account Value [Line Items]

Account Value

11,147

C000020473_1_AdditionalIndexMember_AsOf_2018Member

Account Value [Line Items]

Account Value

11,128

C000020473_1_AdditionalIndexMember_AsOf_2019Member

Account Value [Line Items]

Account Value

12,076

C000020473_1_AdditionalIndexMember_AsOf_2020Member

Account Value [Line Items]

Account Value

12,536

C000020473_1_AdditionalIndexMember_AsOf_2021Member

Account Value [Line Items]

Account Value

12,824

C000020473_1_AdditionalIndexMember_AsOf_2022Member

Account Value [Line Items]

Account Value

11,742

C000020473_1_AdditionalIndexMember_AsOf_2023Member

Account Value [Line Items]

Account Value

11,850

C000020473_1_AdditionalIndexMember_AsOf_2024Member

Account Value [Line Items]

Account Value

12,505

$ 12,505

C000020473_LG_2_AdditionalIndexMember_11YRMember

Account Value [Line Items]

Line Graph and Table Measure Name

Bloomberg Municipal Bond Index" id="sjs-E221">Bloomberg Municipal Bond Index

C000020473_2_AdditionalIndexMember_AsOf_2014Member

Account Value [Line Items]

Account Value

$ 10,000

C000020473_2_AdditionalIndexMember_AsOf_2015Member

Account Value [Line Items]

Account Value

$ 10,252

C000020473_2_AdditionalIndexMember_AsOf_2016Member

Account Value [Line Items]

Account Value

$ 10,958

C000020473_2_AdditionalIndexMember_AsOf_2017Member

Account Value [Line Items]

Account Value

$ 11,054

C000020473_2_AdditionalIndexMember_AsOf_2018Member

Account Value [Line Items]

Account Value

$ 11,108

C000020473_2_AdditionalIndexMember_AsOf_2019Member

Account Value [Line Items]

Account Value

$ 12,077

C000020473_2_AdditionalIndexMember_AsOf_2020Member

Account Value [Line Items]

Account Value

$ 12,468

C000020473_2_AdditionalIndexMember_AsOf_2021Member

Account Value [Line Items]

Account Value

$ 12,891

C000020473_2_AdditionalIndexMember_AsOf_2022Member

Account Value [Line Items]

Account Value

$ 11,778

C000020473_2_AdditionalIndexMember_AsOf_2023Member

Account Value [Line Items]

Account Value

$ 11,979

C000020473_2_AdditionalIndexMember_AsOf_2024Member

Account Value [Line Items]

Account Value

$ 12,708

C000020473_NoLoadClassMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

6.22%

C000020473_NoLoadClassMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

0.68%

C000020473_NoLoadClassMember_10YRMember

Account Value [Line Items]

Average Annual Return, Percent

2.13%

C000020473_0_AdditionalIndexMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

5.53%

C000020473_0_AdditionalIndexMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

0.70%

C000020473_0_AdditionalIndexMember_10YRMember

Account Value [Line Items]

Average Annual Return, Percent

2.26%

Shareholder Report, Holdings (D

Shareholder Report, Holdings (Details)	Aug. 31, 2024
Fidelity Arizona Municipal Income Fund \| RS0Member
Holdings [Line Items]
Percent of Net Asset Value	28.50%
Fidelity Arizona Municipal Income Fund \| RS1Member
Holdings [Line Items]
Percent of Net Asset Value	18.40%
Fidelity Arizona Municipal Income Fund \| RS2Member
Holdings [Line Items]
Percent of Net Asset Value	13.90%
Fidelity Arizona Municipal Income Fund \| RS3Member
Holdings [Line Items]
Percent of Net Asset Value	10%
Fidelity Arizona Municipal Income Fund \| RS4Member
Holdings [Line Items]
Percent of Net Asset Value	9%
Fidelity Arizona Municipal Income Fund \| RS5Member
Holdings [Line Items]
Percent of Net Asset Value	5.80%
Fidelity Arizona Municipal Income Fund \| RS6Member
Holdings [Line Items]
Percent of Net Asset Value	5.30%
Fidelity Arizona Municipal Income Fund \| RS7Member
Holdings [Line Items]
Percent of Net Asset Value	9.10%
Fidelity Arizona Municipal Income Fund \| QDAAAMember
Holdings [Line Items]
Percent of Net Asset Value	2.20%
Fidelity Arizona Municipal Income Fund \| QDAAMember
Holdings [Line Items]
Percent of Net Asset Value	50.20%
Fidelity Arizona Municipal Income Fund \| QDAMember
Holdings [Line Items]
Percent of Net Asset Value	32.90%
Fidelity Arizona Municipal Income Fund \| QDBBBMember
Holdings [Line Items]
Percent of Net Asset Value	6.40%
Fidelity Arizona Municipal Income Fund \| QDBMember
Holdings [Line Items]
Percent of Net Asset Value	0.40%
Fidelity Arizona Municipal Income Fund \| QDNotRatedMember
Holdings [Line Items]
Percent of Net Asset Value	4.60%
Fidelity Arizona Municipal Income Fund \| QDShortTermInvestmentsandNetOtherAssetsLiabilitiesMember
Holdings [Line Items]
Percent of Net Asset Value	3.30%
Fidelity Maryland Municipal Income Fund \| RS0Member
Holdings [Line Items]
Percent of Net Asset Value	25.40%
Fidelity Maryland Municipal Income Fund \| RS1Member
Holdings [Line Items]
Percent of Net Asset Value	23.20%
Fidelity Maryland Municipal Income Fund \| RS2Member
Holdings [Line Items]
Percent of Net Asset Value	12.40%
Fidelity Maryland Municipal Income Fund \| RS3Member
Holdings [Line Items]
Percent of Net Asset Value	9.70%
Fidelity Maryland Municipal Income Fund \| RS4Member
Holdings [Line Items]
Percent of Net Asset Value	7.80%
Fidelity Maryland Municipal Income Fund \| RS5Member
Holdings [Line Items]
Percent of Net Asset Value	7.70%
Fidelity Maryland Municipal Income Fund \| RS6Member
Holdings [Line Items]
Percent of Net Asset Value	6.70%
Fidelity Maryland Municipal Income Fund \| RS7Member
Holdings [Line Items]
Percent of Net Asset Value	7.10%
Fidelity Maryland Municipal Income Fund \| QDAAAMember
Holdings [Line Items]
Percent of Net Asset Value	15.10%
Fidelity Maryland Municipal Income Fund \| QDAAMember
Holdings [Line Items]
Percent of Net Asset Value	30%
Fidelity Maryland Municipal Income Fund \| QDAMember
Holdings [Line Items]
Percent of Net Asset Value	24.70%
Fidelity Maryland Municipal Income Fund \| QDBBBMember
Holdings [Line Items]
Percent of Net Asset Value	14.60%
Fidelity Maryland Municipal Income Fund \| QDBMember
Holdings [Line Items]
Percent of Net Asset Value	0.90%
Fidelity Maryland Municipal Income Fund \| QDNotRatedMember
Holdings [Line Items]
Percent of Net Asset Value	8.10%
Fidelity Maryland Municipal Income Fund \| QDShortTermInvestmentsandNetOtherAssetsLiabilitiesMember
Holdings [Line Items]
Percent of Net Asset Value	6.60%