Investor A1 [Member] Investment Objectives and Goals - Investor A1 - BlackRock New Jersey Municipal Bond Fund |
May 31, 2026 |
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| Prospectus [Line Items] | |
| Risk/Return [Heading] | Fund Overview Key Facts About BlackRock New Jersey Municipal Bond Fund |
| Objective [Heading] | Investment Objective |
| Objective, Primary [Text Block] | The investment objective of BlackRock New Jersey Municipal Bond Fund (the “New Jersey Fund” or the “Fund”) is to provide shareholders with income exempt from Federal income tax and New Jersey personal income taxes.
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