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Label Element Value
Risk Return Abstract rr_RiskReturnAbstract  
Document Type dei_DocumentType 497
Period End Date dei_DocumentPeriodEndDate Aug. 31, 2023
Registrant Name dei_EntityRegistrantName Prudential National Muni Fund, Inc.
CIK dei_EntityCentralIndexKey 0000314612
Amendment Flag dei_AmendmentFlag false
Document Created Date dei_DocumentCreationDate Oct. 30, 2023
Effective Date dei_DocumentEffectiveDate Oct. 31, 2023
Prospectus Date rr_ProspectusDate Oct. 31, 2023
Entity Inv Company Type dei_EntityInvCompanyType N-1A