0000901243 2026-07-29 2026-07-29 0000901243 dei:BusinessContactMember 2026-07-29 2026-07-29 0000901243 false 333-296185 811-07642 N-2 true false 2 true true 13 true BlackRock MuniAssets Fund, Inc. 100 Bellevue Parkway Wilmington DE 19809 800 882-0052 John M. Perlowski, President 50 Hudson Yards New York NY 10001 From time to time after the effective date of this Registration Statement. false true true false false false false false false false true false false true No false false