3.22.2 html 9 84 1 true 9 0 false 2 false false R1.htm 000000 - Document - Document and Entity Information {Elements} Sheet http://www.blackrock.com/role/DocumentDocumentandEntityInformationElements000000 Document and Entity Information 1 false false R2.htm 000021 - Disclosure - Risk/Return Detail Data {Elements} - BLACKROCK WEALTH LIQUID ENVIRONMENTALLY AWARE FUND (Investor A, C and Institutional) Sheet http://www.blackrock.com/role/DisclosureRiskReturnDetailDataElementsBLACKROCKWEALTHLIQUIDENVIRONMENTALLYAWAREFUNDInvestorACandInstitutional Risk/Return Detail Data- BLACKROCK WEALTH LIQUID ENVIRONMENTALLY AWARE FUND (Investor A, C and Institutional) 2 false false R3.htm 000041 - Disclosure - Risk/Return Detail Data {Elements} - BLACKROCK WEALTH LIQUID ENVIRONMENTALLY AWARE FUND (Service) Sheet http://www.blackrock.com/role/DisclosureRiskReturnDetailDataElementsBLACKROCKWEALTHLIQUIDENVIRONMENTALLYAWAREFUNDService Risk/Return Detail Data- BLACKROCK WEALTH LIQUID ENVIRONMENTALLY AWARE FUND (Service) 3 false false R4.htm 000061 - Disclosure - Risk/Return Detail Data {Elements} - BLACKROCK WEALTH LIQUID ENVIRONMENTALLY AWARE FUND (Premier) Sheet http://www.blackrock.com/role/DisclosureRiskReturnDetailDataElementsBLACKROCKWEALTHLIQUIDENVIRONMENTALLYAWAREFUNDPremier000061 Risk/Return Detail Data- BLACKROCK WEALTH LIQUID ENVIRONMENTALLY AWARE FUND (Premier) 4 false false All Reports Book All Reports d326188d485bpos.htm bf1-20220726.xsd bf1-20220726_cal.xml bf1-20220726_def.xml bf1-20220726_lab.xml bf1-20220726_pre.xml d326188dex9910a.htm g326188bar.jpg g326188c301429410001_dgf.jpg g326188g1bar.jpg g326188g1c301429410005_dgf.jpg g326188g1img9594021d1.gif g326188g2bar.jpg g326188g2c301429410004_dgf.jpg g326188g2img7eaeb9d61.gif g326188img15615fde1.gif http://xbrl.sec.gov/dei/2021 http://xbrl.sec.gov/rr/2021 true true