{ "version": "2.2", "instance": { "d34357d485bpos.htm": { "nsprefix": "bf3", "nsuri": "http://www.blackrock.com/20260225", "dts": { "schema": { "local": [ "cik0000893818-20260225.xsd" ], "remote": [ "http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd", "http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd", "http://www.xbrl.org/2003/xl-2003-12-31.xsd", "http://www.xbrl.org/2003/xlink-2003-12-31.xsd", "http://www.xbrl.org/2005/xbrldt-2005.xsd", "http://www.xbrl.org/2006/ref-2006-02-27.xsd", "http://www.xbrl.org/lrr/arcrole/deprecated-2009-12-16.xsd", "http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd", "http://www.xbrl.org/lrr/role/net-2009-12-16.xsd", "https://www.xbrl.org/2020/extensible-enumerations-2.0.xsd", "https://www.xbrl.org/dtr/type/2020-01-21/types.xsd", "https://www.xbrl.org/dtr/type/2024-01-31/types.xsd", "https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd", "https://xbrl.fasb.org/srt/2025/elts/srt-roles-2025.xsd", "https://xbrl.fasb.org/srt/2025/elts/srt-types-2025.xsd", "https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd", "https://xbrl.fasb.org/us-gaap/2025/elts/us-roles-2025.xsd", "https://xbrl.fasb.org/us-gaap/2025/elts/us-types-2025.xsd", "https://xbrl.sec.gov/country/2025/country-2025.xsd", "https://xbrl.sec.gov/country/2025/country-2025_def.xsd", "https://xbrl.sec.gov/dei/2025/dei-2025.xsd", "https://xbrl.sec.gov/oef/2025/oef-2025.xsd", "https://xbrl.sec.gov/oef/2025/oef-2025_cal.xsd", "https://xbrl.sec.gov/oef/2025/oef-2025_lab.xsd", "https://xbrl.sec.gov/oef/2025/oef-rr-2025.xsd", "https://xbrl.sec.gov/stpr/2025/stpr-2025.xsd" ] }, "inline": { "local": [ "d34357d485bpos.htm" ] } }, "keyStandard": 59, "keyCustom": 0, "axisStandard": 5, "axisCustom": 0, "memberStandard": 4, "memberCustom": 128, "hidden": { "total": 96, "http://xbrl.sec.gov/oef/2025": 92, "http://xbrl.sec.gov/dei/2025": 4 }, "contextCount": 1368, "entityCount": 1, "segmentCount": 132, "elementCount": 301, "unitCount": 2, "baseTaxonomies": { "http://xbrl.sec.gov/oef/2025": 2470, "http://xbrl.sec.gov/dei/2025": 6 }, "report": { "R1": { "role": "http://xbrl.sec.gov/rr/role/N1aCover", "longName": "010000 - Disclosure - Form N-1A Cover", "shortName": "Form N-1A Cover", "isDefault": "true", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "1", "firstAnchor": { "contextRef": "DefaultContext", "name": "dei:EntityRegistrantName", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true }, "uniqueAnchor": null }, "R2": { "role": "http://www.blackrock.com/10/role/N1aCover", "longName": "1010000 - Disclosure - Investor A Institutional [Member] N-1A Cover", "shortName": "Investor A Institutional [Member] N-1A Cover", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "2", "firstAnchor": { "contextRef": "DefaultContext", "name": "dei:EntityRegistrantName", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true }, "uniqueAnchor": null }, "R3": { "role": "http://www.blackrock.com/10/role/RiskReturn", "longName": "1010002 - Disclosure - Investor A Institutional [Member] Investment Objectives and Goals", "shortName": "Investor A Institutional [Member] Investment Objectives and Goals", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "3", "firstAnchor": { "contextRef": "D20251031_20251031_S000086332Member_InvestorAInstitutionalMember", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000086332Member_InvestorAInstitutionalMember", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R4": { "role": "http://www.blackrock.com/10/role/FeesAndExpenses", "longName": "1010003 - Disclosure - Investor A Institutional [Member] Fees and Expenses", "shortName": "Investor A Institutional [Member] Fees and Expenses", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "4", "firstAnchor": { "contextRef": "D20251031_20251031_S000086332Member_InvestorAInstitutionalMember", "name": "oef:ExpenseHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000086332Member_InvestorAInstitutionalMember", "name": "oef:ExpenseHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R5": { "role": "http://www.blackrock.com/10/role/InvestmentStrategy", "longName": "1010004 - Disclosure - Investor A Institutional [Member] Investment Strategy", "shortName": "Investor A Institutional [Member] Investment Strategy", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "5", "firstAnchor": { "contextRef": "D20251031_20251031_S000086332Member_InvestorAInstitutionalMember", "name": "oef:StrategyHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000086332Member_InvestorAInstitutionalMember", "name": "oef:StrategyHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R6": { "role": "http://www.blackrock.com/10/role/InvestmentRisks", "longName": "1010005 - Disclosure - Investor A Institutional [Member] Investment Risks", "shortName": "Investor A Institutional [Member] Investment Risks", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "6", "firstAnchor": { "contextRef": "D20251031_20251031_S000086332Member_InvestorAInstitutionalMember_EquitySecuritiesRiskMember", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000086332Member_InvestorAInstitutionalMember_EquitySecuritiesRiskMember", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R7": { "role": "http://www.blackrock.com/10/role/PerformanceManagement", "longName": "1010006 - Disclosure - Investor A Institutional [Member] Performance Management", "shortName": "Investor A Institutional [Member] Performance Management", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "7", "firstAnchor": { "contextRef": "D20251031_20251031_S000086332Member_InvestorAInstitutionalMember", "name": "oef:BarChartAndPerformanceTableHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000086332Member_InvestorAInstitutionalMember", "name": "oef:BarChartAndPerformanceTableHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R8": { "role": "http://www.blackrock.com/10/role/OperatingExpensesData", "longName": "1020020 - Disclosure - Investor A Institutional [Member] Annual Fund Operating Expenses", "shortName": "Investor A Institutional [Member] Annual Fund Operating Expenses", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "8", "firstAnchor": { "contextRef": "D20251031_20251031_S000086332Member_InvestorAInstitutionalMember", "name": "oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "link:footnote", "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000086332Member_InvestorAInstitutionalMember", "name": "oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "link:footnote", "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R9": { "role": "http://www.blackrock.com/10/role/ExpenseExample", "longName": "1020030 - Disclosure - Investor A Institutional [Member] Expense Example", "shortName": "Investor A Institutional [Member] Expense Example", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "9", "firstAnchor": { "contextRef": "D20251031_20251031_S000086332Member_C000251817Member_InvestorAInstitutionalMember", "name": "oef:ExpenseExampleYear01", "unitRef": "USD", "xsiNil": "false", "lang": null, "decimals": "INF", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000086332Member_C000251817Member_InvestorAInstitutionalMember", "name": "oef:ExpenseExampleYear01", "unitRef": "USD", "xsiNil": "false", "lang": null, "decimals": "INF", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R10": { "role": "http://www.blackrock.com/10/role/BarChartData", "longName": "1020050 - Disclosure - Investor A Institutional [Member] Annual Total Returns", "shortName": "Investor A Institutional [Member] Annual Total Returns", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "10", "firstAnchor": null, "uniqueAnchor": null }, "R11": { "role": "http://www.blackrock.com/10/role/PerformanceTableData", "longName": "1020060 - Disclosure - Investor A Institutional [Member] Average Annual Total Returns", "shortName": "Investor A Institutional [Member] Average Annual Total Returns", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "11", "firstAnchor": { "contextRef": "FY2025_InvestorAInstitutionalMember_S000086332MSCIUSAIndexMember", "name": "oef:AvgAnnlRtrPct", "unitRef": "pure", "xsiNil": "false", "lang": null, "decimals": "4", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "FY2025_InvestorAInstitutionalMember_S000086332MSCIUSAIndexMember", "name": "oef:AvgAnnlRtrPct", "unitRef": "pure", "xsiNil": "false", "lang": null, "decimals": "4", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R12": { "role": "http://www.blackrock.com/1/role/N1aCover", "longName": "110000 - Disclosure - Investor A Institutional [Member] N-1A Cover", "shortName": "Investor A Institutional [Member] N-1A Cover", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "12", "firstAnchor": { "contextRef": "DefaultContext", "name": "dei:EntityRegistrantName", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true }, "uniqueAnchor": null }, "R13": { "role": "http://www.blackrock.com/1/role/RiskReturn", "longName": "110002 - Disclosure - Investor A Institutional [Member] Investment Objectives and Goals", "shortName": "Investor A Institutional [Member] Investment Objectives and Goals", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "13", "firstAnchor": { "contextRef": "D20251031_20251031_S000069122Member_InvestorAInstitutionalMember", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069122Member_InvestorAInstitutionalMember", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R14": { "role": "http://www.blackrock.com/1/role/FeesAndExpenses", "longName": "110003 - Disclosure - Investor A Institutional [Member] Fees and Expenses", "shortName": "Investor A Institutional [Member] Fees and Expenses", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "14", "firstAnchor": { "contextRef": "D20251031_20251031_S000069122Member_InvestorAInstitutionalMember", "name": "oef:ExpenseHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069122Member_InvestorAInstitutionalMember", "name": "oef:ExpenseHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R15": { "role": "http://www.blackrock.com/1/role/InvestmentStrategy", "longName": "110004 - Disclosure - Investor A Institutional [Member] Investment Strategy", "shortName": "Investor A Institutional [Member] Investment Strategy", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "15", "firstAnchor": { "contextRef": "D20251031_20251031_S000069122Member_InvestorAInstitutionalMember", "name": "oef:StrategyHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069122Member_InvestorAInstitutionalMember", "name": "oef:StrategyHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R16": { "role": "http://www.blackrock.com/1/role/InvestmentRisks", "longName": "110005 - Disclosure - Investor A Institutional [Member] Investment Risks", "shortName": "Investor A Institutional [Member] Investment Risks", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "16", "firstAnchor": { "contextRef": "D20251031_20251031_S000069122Member_InvestorAInstitutionalMember_EquitySecuritiesRiskMember", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069122Member_InvestorAInstitutionalMember_EquitySecuritiesRiskMember", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R17": { "role": "http://www.blackrock.com/1/role/PerformanceManagement", "longName": "110006 - Disclosure - Investor A Institutional [Member] Performance Management", "shortName": "Investor A Institutional [Member] Performance Management", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "17", "firstAnchor": { "contextRef": "D20251031_20251031_S000069122Member_InvestorAInstitutionalMember", "name": "oef:BarChartAndPerformanceTableHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069122Member_InvestorAInstitutionalMember", "name": "oef:BarChartAndPerformanceTableHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R18": { "role": "http://www.blackrock.com/11/role/N1aCover", "longName": "1110000 - Disclosure - Class K [Member] N-1A Cover", "shortName": "Class K [Member] N-1A Cover", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "18", "firstAnchor": { "contextRef": "DefaultContext", "name": "dei:EntityRegistrantName", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true }, "uniqueAnchor": null }, "R19": { "role": "http://www.blackrock.com/11/role/RiskReturn", "longName": "1110002 - Disclosure - Class K [Member] Investment Objectives and Goals", "shortName": "Class K [Member] Investment Objectives and Goals", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "19", "firstAnchor": { "contextRef": "D20251031_20251031_S000069122Member_ClassKMember", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069122Member_ClassKMember", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R20": { "role": "http://www.blackrock.com/11/role/FeesAndExpenses", "longName": "1110003 - Disclosure - Class K [Member] Fees and Expenses", "shortName": "Class K [Member] Fees and Expenses", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "20", "firstAnchor": { "contextRef": "D20251031_20251031_S000069122Member_ClassKMember", "name": "oef:ExpenseHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069122Member_ClassKMember", "name": "oef:ExpenseHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R21": { "role": "http://www.blackrock.com/11/role/InvestmentStrategy", "longName": "1110004 - Disclosure - Class K [Member] Investment Strategy", "shortName": "Class K [Member] Investment Strategy", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "21", "firstAnchor": { "contextRef": "D20251031_20251031_S000069122Member_ClassKMember", "name": "oef:StrategyHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069122Member_ClassKMember", "name": "oef:StrategyHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R22": { "role": "http://www.blackrock.com/11/role/InvestmentRisks", "longName": "1110005 - Disclosure - Class K [Member] Investment Risks", "shortName": "Class K [Member] Investment Risks", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "22", "firstAnchor": { "contextRef": "D20251031_20251031_S000069122Member_ClassKMember_EquitySecuritiesRiskMember", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069122Member_ClassKMember_EquitySecuritiesRiskMember", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R23": { "role": "http://www.blackrock.com/11/role/PerformanceManagement", "longName": "1110006 - Disclosure - Class K [Member] Performance Management", "shortName": "Class K [Member] Performance Management", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "23", "firstAnchor": { "contextRef": "D20251031_20251031_S000069122Member_ClassKMember", "name": "oef:BarChartAndPerformanceTableHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069122Member_ClassKMember", "name": "oef:BarChartAndPerformanceTableHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R24": { "role": "http://www.blackrock.com/11/role/OperatingExpensesData", "longName": "1120020 - Disclosure - Class K [Member] Annual Fund Operating Expenses", "shortName": "Class K [Member] Annual Fund Operating Expenses", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "24", "firstAnchor": { "contextRef": "D20251031_20251031_S000069122Member_ClassKMember", "name": "oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "link:footnote", "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069122Member_ClassKMember", "name": "oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "link:footnote", "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R25": { "role": "http://www.blackrock.com/11/role/ExpenseExample", "longName": "1120030 - Disclosure - Class K [Member] Expense Example", "shortName": "Class K [Member] Expense Example", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "25", "firstAnchor": { "contextRef": "D20251031_20251031_S000069122Member_C000220929Member_ClassKMember", "name": "oef:ExpenseExampleYear01", "unitRef": "USD", "xsiNil": "false", "lang": null, "decimals": "INF", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069122Member_C000220929Member_ClassKMember", "name": "oef:ExpenseExampleYear01", "unitRef": "USD", "xsiNil": "false", "lang": null, "decimals": "INF", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R26": { "role": "http://www.blackrock.com/11/role/BarChartData", "longName": "1120050 - Disclosure - Class K [Member] Annual Total Returns", "shortName": "Class K [Member] Annual Total Returns", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "26", "firstAnchor": null, "uniqueAnchor": null }, "R27": { "role": "http://www.blackrock.com/11/role/PerformanceTableData", "longName": "1120060 - Disclosure - Class K [Member] Average Annual Total Returns", "shortName": "Class K [Member] Average Annual Total Returns", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "27", "firstAnchor": { "contextRef": "FY2025_S000069122BloombergUSAggregateBondIndexMember_ClassKMember", "name": "oef:AvgAnnlRtrPct", "unitRef": "pure", "xsiNil": "false", "lang": null, "decimals": "4", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "FY2025_S000069122BloombergUSAggregateBondIndexMember_ClassKMember", "name": "oef:AvgAnnlRtrPct", "unitRef": "pure", "xsiNil": "false", "lang": null, "decimals": "4", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R28": { "role": "http://www.blackrock.com/1/role/OperatingExpensesData", "longName": "120020 - Disclosure - Investor A Institutional [Member] Annual Fund Operating Expenses", "shortName": "Investor A Institutional [Member] Annual Fund Operating Expenses", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "28", "firstAnchor": { "contextRef": "D20251031_20251031_S000069122Member_InvestorAInstitutionalMember", "name": "oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "link:footnote", "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069122Member_InvestorAInstitutionalMember", "name": "oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "link:footnote", "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R29": { "role": "http://www.blackrock.com/1/role/ExpenseExample", "longName": "120030 - Disclosure - Investor A Institutional [Member] Expense Example", "shortName": "Investor A Institutional [Member] Expense Example", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "29", "firstAnchor": { "contextRef": "D20251031_20251031_S000069122Member_C000220930Member_InvestorAInstitutionalMember", "name": "oef:ExpenseExampleYear01", "unitRef": "USD", "xsiNil": "false", "lang": null, "decimals": "INF", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069122Member_C000220930Member_InvestorAInstitutionalMember", "name": "oef:ExpenseExampleYear01", "unitRef": "USD", "xsiNil": "false", "lang": null, "decimals": "INF", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R30": { "role": "http://www.blackrock.com/1/role/BarChartData", "longName": "120050 - Disclosure - Investor A Institutional [Member] Annual Total Returns", "shortName": "Investor A Institutional [Member] Annual Total Returns", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "30", "firstAnchor": null, "uniqueAnchor": null }, "R31": { "role": "http://www.blackrock.com/1/role/PerformanceTableData", "longName": "120060 - Disclosure - Investor A Institutional [Member] Average Annual Total Returns", "shortName": "Investor A Institutional [Member] Average Annual Total Returns", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "31", "firstAnchor": { "contextRef": "FY2025_S000069122BloombergUSAggregateBondIndexMember_InvestorAInstitutionalMember", "name": "oef:AvgAnnlRtrPct", "unitRef": "pure", "xsiNil": "false", "lang": null, "decimals": "4", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "FY2025_S000069122BloombergUSAggregateBondIndexMember_InvestorAInstitutionalMember", "name": "oef:AvgAnnlRtrPct", "unitRef": "pure", "xsiNil": "false", "lang": null, "decimals": "4", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R32": { "role": "http://www.blackrock.com/12/role/N1aCover", "longName": "1210000 - Disclosure - Class K [Member] N-1A Cover", "shortName": "Class K [Member] N-1A Cover", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "32", "firstAnchor": { "contextRef": "DefaultContext", "name": "dei:EntityRegistrantName", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true }, "uniqueAnchor": null }, "R33": { "role": "http://www.blackrock.com/12/role/RiskReturn", "longName": "1210002 - Disclosure - Class K [Member] Investment Objectives and Goals", "shortName": "Class K [Member] Investment Objectives and Goals", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "33", "firstAnchor": { "contextRef": "D20251031_20251031_S000069125Member_ClassKMember", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069125Member_ClassKMember", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R34": { "role": "http://www.blackrock.com/12/role/FeesAndExpenses", "longName": "1210003 - Disclosure - Class K [Member] Fees and Expenses", "shortName": "Class K [Member] Fees and Expenses", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "34", "firstAnchor": { "contextRef": "D20251031_20251031_S000069125Member_ClassKMember", "name": "oef:ExpenseHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069125Member_ClassKMember", "name": "oef:ExpenseHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R35": { "role": "http://www.blackrock.com/12/role/InvestmentStrategy", "longName": "1210004 - Disclosure - Class K [Member] Investment Strategy", "shortName": "Class K [Member] Investment Strategy", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "35", "firstAnchor": { "contextRef": "D20251031_20251031_S000069125Member_ClassKMember", "name": "oef:StrategyHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069125Member_ClassKMember", "name": "oef:StrategyHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R36": { "role": "http://www.blackrock.com/12/role/InvestmentRisks", "longName": "1210005 - Disclosure - Class K [Member] Investment Risks", "shortName": "Class K [Member] Investment Risks", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "36", "firstAnchor": { "contextRef": "D20251031_20251031_S000069125Member_ClassKMember_EquitySecuritiesRiskMember", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069125Member_ClassKMember_EquitySecuritiesRiskMember", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R37": { "role": "http://www.blackrock.com/12/role/PerformanceManagement", "longName": "1210006 - Disclosure - Class K [Member] Performance Management", "shortName": "Class K [Member] Performance Management", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "37", "firstAnchor": { "contextRef": "D20251031_20251031_S000069125Member_ClassKMember", "name": "oef:BarChartAndPerformanceTableHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069125Member_ClassKMember", "name": "oef:BarChartAndPerformanceTableHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R38": { "role": "http://www.blackrock.com/12/role/OperatingExpensesData", "longName": "1220020 - Disclosure - Class K [Member] Annual Fund Operating Expenses", "shortName": "Class K [Member] Annual Fund Operating Expenses", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "38", "firstAnchor": { "contextRef": "D20251031_20251031_S000069125Member_ClassKMember", "name": "oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "link:footnote", "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069125Member_ClassKMember", "name": "oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "link:footnote", "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R39": { "role": "http://www.blackrock.com/12/role/ExpenseExample", "longName": "1220030 - Disclosure - Class K [Member] Expense Example", "shortName": "Class K [Member] Expense Example", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "39", "firstAnchor": { "contextRef": "D20251031_20251031_S000069125Member_C000220940Member_ClassKMember", "name": "oef:ExpenseExampleYear01", "unitRef": "USD", "xsiNil": "false", "lang": null, "decimals": "INF", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069125Member_C000220940Member_ClassKMember", "name": "oef:ExpenseExampleYear01", "unitRef": "USD", "xsiNil": "false", "lang": null, "decimals": "INF", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R40": { "role": "http://www.blackrock.com/12/role/BarChartData", "longName": "1220050 - Disclosure - Class K [Member] Annual Total Returns", "shortName": "Class K [Member] Annual Total Returns", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "40", "firstAnchor": null, "uniqueAnchor": null }, "R41": { "role": "http://www.blackrock.com/12/role/PerformanceTableData", "longName": "1220060 - Disclosure - Class K [Member] Average Annual Total Returns", "shortName": "Class K [Member] Average Annual Total Returns", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "41", "firstAnchor": { "contextRef": "FY2025_S000069125MSCIUSAIndexMember_ClassKMember", "name": "oef:AvgAnnlRtrPct", "unitRef": "pure", "xsiNil": "false", "lang": null, "decimals": "4", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "FY2025_S000069125MSCIUSAIndexMember_ClassKMember", "name": "oef:AvgAnnlRtrPct", "unitRef": "pure", "xsiNil": "false", "lang": null, "decimals": "4", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R42": { "role": "http://www.blackrock.com/13/role/N1aCover", "longName": "1310000 - Disclosure - Class K [Member] N-1A Cover", "shortName": "Class K [Member] N-1A Cover", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "42", "firstAnchor": { "contextRef": "DefaultContext", "name": "dei:EntityRegistrantName", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true }, "uniqueAnchor": null }, "R43": { "role": "http://www.blackrock.com/13/role/RiskReturn", "longName": "1310002 - Disclosure - Class K [Member] Investment Objectives and Goals", "shortName": "Class K [Member] Investment Objectives and Goals", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "43", "firstAnchor": { "contextRef": "D20251031_20251031_S000069126Member_ClassKMember", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069126Member_ClassKMember", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R44": { "role": "http://www.blackrock.com/13/role/FeesAndExpenses", "longName": "1310003 - Disclosure - Class K [Member] Fees and Expenses", "shortName": "Class K [Member] Fees and Expenses", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "44", "firstAnchor": { "contextRef": "D20251031_20251031_S000069126Member_ClassKMember", "name": "oef:ExpenseHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069126Member_ClassKMember", "name": "oef:ExpenseHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R45": { "role": "http://www.blackrock.com/13/role/InvestmentStrategy", "longName": "1310004 - Disclosure - Class K [Member] Investment Strategy", "shortName": "Class K [Member] Investment Strategy", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "45", "firstAnchor": { "contextRef": "D20251031_20251031_S000069126Member_ClassKMember", "name": "oef:StrategyHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069126Member_ClassKMember", "name": "oef:StrategyHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R46": { "role": "http://www.blackrock.com/13/role/InvestmentRisks", "longName": "1310005 - Disclosure - Class K [Member] Investment Risks", "shortName": "Class K [Member] Investment Risks", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "46", "firstAnchor": { "contextRef": "D20251031_20251031_S000069126Member_ClassKMember_EquitySecuritiesRiskMember", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069126Member_ClassKMember_EquitySecuritiesRiskMember", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R47": { "role": "http://www.blackrock.com/13/role/PerformanceManagement", "longName": "1310006 - Disclosure - Class K [Member] Performance Management", "shortName": "Class K [Member] Performance Management", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "47", "firstAnchor": { "contextRef": "D20251031_20251031_S000069126Member_ClassKMember", "name": "oef:BarChartAndPerformanceTableHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069126Member_ClassKMember", "name": "oef:BarChartAndPerformanceTableHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R48": { "role": "http://www.blackrock.com/13/role/OperatingExpensesData", "longName": "1320020 - Disclosure - Class K [Member] Annual Fund Operating Expenses", "shortName": "Class K [Member] Annual Fund Operating Expenses", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "48", "firstAnchor": { "contextRef": "D20251031_20251031_S000069126Member_ClassKMember", "name": "oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "link:footnote", "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069126Member_ClassKMember", "name": "oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "link:footnote", "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R49": { "role": "http://www.blackrock.com/13/role/ExpenseExample", "longName": "1320030 - Disclosure - Class K [Member] Expense Example", "shortName": "Class K [Member] Expense Example", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "49", "firstAnchor": { "contextRef": "D20251031_20251031_S000069126Member_C000220943Member_ClassKMember", "name": "oef:ExpenseExampleYear01", "unitRef": "USD", "xsiNil": "false", "lang": null, "decimals": "INF", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069126Member_C000220943Member_ClassKMember", "name": "oef:ExpenseExampleYear01", "unitRef": "USD", "xsiNil": "false", "lang": null, "decimals": "INF", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R50": { "role": "http://www.blackrock.com/13/role/BarChartData", "longName": "1320050 - Disclosure - Class K [Member] Annual Total Returns", "shortName": "Class K [Member] Annual Total Returns", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "50", "firstAnchor": null, "uniqueAnchor": null }, "R51": { "role": "http://www.blackrock.com/13/role/PerformanceTableData", "longName": "1320060 - Disclosure - Class K [Member] Average Annual Total Returns", "shortName": "Class K [Member] Average Annual Total Returns", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "51", "firstAnchor": { "contextRef": "FY2025_C000220943Member_ClassKMember", "name": "oef:AvgAnnlRtrPct", "unitRef": "pure", "xsiNil": "false", "lang": null, "decimals": "4", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "FY2025_C000220943Member_ClassKMember", "name": "oef:AvgAnnlRtrPct", "unitRef": "pure", "xsiNil": "false", "lang": null, "decimals": "4", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R52": { "role": "http://www.blackrock.com/14/role/N1aCover", "longName": "1410000 - Disclosure - Class K [Member] N-1A Cover", "shortName": "Class K [Member] N-1A Cover", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "52", "firstAnchor": { "contextRef": "DefaultContext", "name": "dei:EntityRegistrantName", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true }, "uniqueAnchor": null }, "R53": { "role": "http://www.blackrock.com/14/role/RiskReturn", "longName": "1410002 - Disclosure - Class K [Member] Investment Objectives and Goals", "shortName": "Class K [Member] Investment Objectives and Goals", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "53", "firstAnchor": { "contextRef": "D20251031_20251031_S000069127Member_ClassKMember", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069127Member_ClassKMember", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R54": { "role": "http://www.blackrock.com/14/role/FeesAndExpenses", "longName": "1410003 - Disclosure - Class K [Member] Fees and Expenses", "shortName": "Class K [Member] Fees and Expenses", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "54", "firstAnchor": { "contextRef": "D20251031_20251031_S000069127Member_ClassKMember", "name": "oef:ExpenseHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069127Member_ClassKMember", "name": "oef:ExpenseHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R55": { "role": "http://www.blackrock.com/14/role/InvestmentStrategy", "longName": "1410004 - Disclosure - Class K [Member] Investment Strategy", "shortName": "Class K [Member] Investment Strategy", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "55", "firstAnchor": { "contextRef": "D20251031_20251031_S000069127Member_ClassKMember", "name": "oef:StrategyHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069127Member_ClassKMember", "name": "oef:StrategyHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R56": { "role": "http://www.blackrock.com/14/role/InvestmentRisks", "longName": "1410005 - Disclosure - Class K [Member] Investment Risks", "shortName": "Class K [Member] Investment Risks", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "56", "firstAnchor": { "contextRef": "D20251031_20251031_S000069127Member_ClassKMember_EquitySecuritiesRiskMember", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069127Member_ClassKMember_EquitySecuritiesRiskMember", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R57": { "role": "http://www.blackrock.com/14/role/PerformanceManagement", "longName": "1410006 - Disclosure - Class K [Member] Performance Management", "shortName": "Class K [Member] Performance Management", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "57", "firstAnchor": { "contextRef": "D20251031_20251031_S000069127Member_ClassKMember", "name": "oef:BarChartAndPerformanceTableHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069127Member_ClassKMember", "name": "oef:BarChartAndPerformanceTableHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R58": { "role": "http://www.blackrock.com/14/role/OperatingExpensesData", "longName": "1420020 - Disclosure - Class K [Member] Annual Fund Operating Expenses", "shortName": "Class K [Member] Annual Fund Operating Expenses", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "58", "firstAnchor": { "contextRef": "D20251031_20251031_S000069127Member_ClassKMember", "name": "oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "link:footnote", "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069127Member_ClassKMember", "name": "oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "link:footnote", "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R59": { "role": "http://www.blackrock.com/14/role/ExpenseExample", "longName": "1420030 - Disclosure - Class K [Member] Expense Example", "shortName": "Class K [Member] Expense Example", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "59", "firstAnchor": { "contextRef": "D20251031_20251031_S000069127Member_C000220945Member_ClassKMember", "name": "oef:ExpenseExampleYear01", "unitRef": "USD", "xsiNil": "false", "lang": null, "decimals": "INF", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069127Member_C000220945Member_ClassKMember", "name": "oef:ExpenseExampleYear01", "unitRef": "USD", "xsiNil": "false", "lang": null, "decimals": "INF", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R60": { "role": "http://www.blackrock.com/14/role/BarChartData", "longName": "1420050 - Disclosure - Class K [Member] Annual Total Returns", "shortName": "Class K [Member] Annual Total Returns", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "60", "firstAnchor": null, "uniqueAnchor": null }, "R61": { "role": "http://www.blackrock.com/14/role/PerformanceTableData", "longName": "1420060 - Disclosure - Class K [Member] Average Annual Total Returns", "shortName": "Class K [Member] Average Annual Total Returns", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "61", "firstAnchor": { "contextRef": "FY2025_S000069127MSCIUSAIndexMember_ClassKMember", "name": "oef:AvgAnnlRtrPct", "unitRef": "pure", "xsiNil": "false", "lang": null, "decimals": "4", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "FY2025_S000069127MSCIUSAIndexMember_ClassKMember", "name": "oef:AvgAnnlRtrPct", "unitRef": "pure", "xsiNil": "false", "lang": null, "decimals": "4", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R62": { "role": "http://www.blackrock.com/15/role/N1aCover", "longName": "1510000 - Disclosure - Class K [Member] N-1A Cover", "shortName": "Class K [Member] N-1A Cover", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "62", "firstAnchor": { "contextRef": "DefaultContext", "name": "dei:EntityRegistrantName", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true }, "uniqueAnchor": null }, "R63": { "role": "http://www.blackrock.com/15/role/RiskReturn", "longName": "1510002 - Disclosure - Class K [Member] Investment Objectives and Goals", "shortName": "Class K [Member] Investment Objectives and Goals", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "63", "firstAnchor": { "contextRef": "D20251031_20251031_S000069128Member_ClassKMember", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069128Member_ClassKMember", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R64": { "role": "http://www.blackrock.com/15/role/FeesAndExpenses", "longName": "1510003 - Disclosure - Class K [Member] Fees and Expenses", "shortName": "Class K [Member] Fees and Expenses", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "64", "firstAnchor": { "contextRef": "D20251031_20251031_S000069128Member_ClassKMember", "name": "oef:ExpenseHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "span", "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069128Member_ClassKMember", "name": "oef:ExpenseHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "span", "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R65": { "role": "http://www.blackrock.com/15/role/InvestmentStrategy", "longName": "1510004 - Disclosure - Class K [Member] Investment Strategy", "shortName": "Class K [Member] Investment Strategy", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "65", "firstAnchor": { "contextRef": "D20251031_20251031_S000069128Member_ClassKMember", "name": "oef:StrategyHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "span", "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069128Member_ClassKMember", "name": "oef:StrategyHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "span", "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R66": { "role": "http://www.blackrock.com/15/role/InvestmentRisks", "longName": "1510005 - Disclosure - Class K [Member] Investment Risks", "shortName": "Class K [Member] Investment Risks", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "66", "firstAnchor": { "contextRef": "D20251031_20251031_S000069128Member_ClassKMember_EquitySecuritiesRiskMember", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069128Member_ClassKMember_EquitySecuritiesRiskMember", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R67": { "role": "http://www.blackrock.com/15/role/PerformanceManagement", "longName": "1510006 - Disclosure - Class K [Member] Performance Management", "shortName": "Class K [Member] Performance Management", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "67", "firstAnchor": { "contextRef": "D20251031_20251031_S000069128Member_ClassKMember", "name": "oef:BarChartAndPerformanceTableHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "span", "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069128Member_ClassKMember", "name": "oef:BarChartAndPerformanceTableHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "span", "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R68": { "role": "http://www.blackrock.com/15/role/OperatingExpensesData", "longName": "1520020 - Disclosure - Class K [Member] Annual Fund Operating Expenses", "shortName": "Class K [Member] Annual Fund Operating Expenses", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "68", "firstAnchor": { "contextRef": "D20251031_20251031_S000069128Member_ClassKMember", "name": "oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "link:footnote", "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069128Member_ClassKMember", "name": "oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "link:footnote", "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R69": { "role": "http://www.blackrock.com/15/role/ExpenseExample", "longName": "1520030 - Disclosure - Class K [Member] Expense Example", "shortName": "Class K [Member] Expense Example", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "69", "firstAnchor": { "contextRef": "D20251031_20251031_S000069128Member_C000220949Member_ClassKMember", "name": "oef:ExpenseExampleYear01", "unitRef": "USD", "xsiNil": "false", "lang": null, "decimals": "INF", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069128Member_C000220949Member_ClassKMember", "name": "oef:ExpenseExampleYear01", "unitRef": "USD", "xsiNil": "false", "lang": null, "decimals": "INF", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R70": { "role": "http://www.blackrock.com/15/role/BarChartData", "longName": "1520050 - Disclosure - Class K [Member] Annual Total Returns", "shortName": "Class K [Member] Annual Total Returns", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "70", "firstAnchor": null, "uniqueAnchor": null }, "R71": { "role": "http://www.blackrock.com/15/role/PerformanceTableData", "longName": "1520060 - Disclosure - Class K [Member] Average Annual Total Returns", "shortName": "Class K [Member] Average Annual Total Returns", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "71", "firstAnchor": { "contextRef": "FY2025_ClassKMember_S000069128MSCIUSAIndexMember", "name": "oef:AvgAnnlRtrPct", "unitRef": "pure", "xsiNil": "false", "lang": null, "decimals": "4", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "FY2025_ClassKMember_S000069128MSCIUSAIndexMember", "name": "oef:AvgAnnlRtrPct", "unitRef": "pure", "xsiNil": "false", "lang": null, "decimals": "4", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R72": { "role": "http://www.blackrock.com/16/role/N1aCover", "longName": "1610000 - Disclosure - Class K [Member] N-1A Cover", "shortName": "Class K [Member] N-1A Cover", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "72", "firstAnchor": { "contextRef": "DefaultContext", "name": "dei:EntityRegistrantName", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true }, "uniqueAnchor": null }, "R73": { "role": "http://www.blackrock.com/16/role/RiskReturn", "longName": "1610002 - Disclosure - Class K [Member] Investment Objectives and Goals", "shortName": "Class K [Member] Investment Objectives and Goals", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "73", "firstAnchor": { "contextRef": "D20251031_20251031_S000069129Member_ClassKMember", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069129Member_ClassKMember", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R74": { "role": "http://www.blackrock.com/16/role/FeesAndExpenses", "longName": "1610003 - Disclosure - Class K [Member] Fees and Expenses", "shortName": "Class K [Member] Fees and Expenses", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "74", "firstAnchor": { "contextRef": "D20251031_20251031_S000069129Member_ClassKMember", "name": "oef:ExpenseHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "span", "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069129Member_ClassKMember", "name": "oef:ExpenseHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "span", "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R75": { "role": "http://www.blackrock.com/16/role/InvestmentStrategy", "longName": "1610004 - Disclosure - Class K [Member] Investment Strategy", "shortName": "Class K [Member] Investment Strategy", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "75", "firstAnchor": { "contextRef": "D20251031_20251031_S000069129Member_ClassKMember", "name": "oef:StrategyHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "span", "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069129Member_ClassKMember", "name": "oef:StrategyHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "span", "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R76": { "role": "http://www.blackrock.com/16/role/InvestmentRisks", "longName": "1610005 - Disclosure - Class K [Member] Investment Risks", "shortName": "Class K [Member] Investment Risks", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "76", "firstAnchor": { "contextRef": "D20251031_20251031_S000069129Member_ClassKMember_EquitySecuritiesRiskMember", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069129Member_ClassKMember_EquitySecuritiesRiskMember", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R77": { "role": "http://www.blackrock.com/16/role/PerformanceManagement", "longName": "1610006 - Disclosure - Class K [Member] Performance Management", "shortName": "Class K [Member] Performance Management", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "77", "firstAnchor": { "contextRef": "D20251031_20251031_S000069129Member_ClassKMember", "name": "oef:BarChartAndPerformanceTableHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "span", "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069129Member_ClassKMember", "name": "oef:BarChartAndPerformanceTableHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "span", "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R78": { "role": "http://www.blackrock.com/16/role/OperatingExpensesData", "longName": "1620020 - Disclosure - Class K [Member] Annual Fund Operating Expenses", "shortName": "Class K [Member] Annual Fund Operating Expenses", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "78", "firstAnchor": { "contextRef": "D20251031_20251031_S000069129Member_ClassKMember", "name": "oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "link:footnote", "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069129Member_ClassKMember", "name": "oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "link:footnote", "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R79": { "role": "http://www.blackrock.com/16/role/ExpenseExample", "longName": "1620030 - Disclosure - Class K [Member] Expense Example", "shortName": "Class K [Member] Expense Example", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "79", "firstAnchor": { "contextRef": "D20251031_20251031_S000069129Member_C000220952Member_ClassKMember", "name": "oef:ExpenseExampleYear01", "unitRef": "USD", "xsiNil": "false", "lang": null, "decimals": "INF", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069129Member_C000220952Member_ClassKMember", "name": "oef:ExpenseExampleYear01", "unitRef": "USD", "xsiNil": "false", "lang": null, "decimals": "INF", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R80": { "role": "http://www.blackrock.com/16/role/BarChartData", "longName": "1620050 - Disclosure - Class K [Member] Annual Total Returns", "shortName": "Class K [Member] Annual Total Returns", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "80", "firstAnchor": null, "uniqueAnchor": null }, "R81": { "role": "http://www.blackrock.com/16/role/PerformanceTableData", "longName": "1620060 - Disclosure - Class K [Member] Average Annual Total Returns", "shortName": "Class K [Member] Average Annual Total Returns", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "81", "firstAnchor": { "contextRef": "FY2025_ClassKMember_S000069129MSCIUSAIndexMember", "name": "oef:AvgAnnlRtrPct", "unitRef": "pure", "xsiNil": "false", "lang": null, "decimals": "4", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "FY2025_ClassKMember_S000069129MSCIUSAIndexMember", "name": "oef:AvgAnnlRtrPct", "unitRef": "pure", "xsiNil": "false", "lang": null, "decimals": "4", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R82": { "role": "http://www.blackrock.com/17/role/N1aCover", "longName": "1710000 - Disclosure - Class K [Member] N-1A Cover", "shortName": "Class K [Member] N-1A Cover", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "82", "firstAnchor": { "contextRef": "DefaultContext", "name": "dei:EntityRegistrantName", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true }, "uniqueAnchor": null }, "R83": { "role": "http://www.blackrock.com/17/role/RiskReturn", "longName": "1710002 - Disclosure - Class K [Member] Investment Objectives and Goals", "shortName": "Class K [Member] Investment Objectives and Goals", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "83", "firstAnchor": { "contextRef": "D20251031_20251031_S000069130Member_ClassKMember", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069130Member_ClassKMember", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R84": { "role": "http://www.blackrock.com/17/role/FeesAndExpenses", "longName": "1710003 - Disclosure - Class K [Member] Fees and Expenses", "shortName": "Class K [Member] Fees and Expenses", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "84", "firstAnchor": { "contextRef": "D20251031_20251031_S000069130Member_ClassKMember", "name": "oef:ExpenseHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069130Member_ClassKMember", "name": "oef:ExpenseHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R85": { "role": "http://www.blackrock.com/17/role/InvestmentStrategy", "longName": "1710004 - Disclosure - Class K [Member] Investment Strategy", "shortName": "Class K [Member] Investment Strategy", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "85", "firstAnchor": { "contextRef": "D20251031_20251031_S000069130Member_ClassKMember", "name": "oef:StrategyHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069130Member_ClassKMember", "name": "oef:StrategyHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R86": { "role": "http://www.blackrock.com/17/role/InvestmentRisks", "longName": "1710005 - Disclosure - Class K [Member] Investment Risks", "shortName": "Class K [Member] Investment Risks", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "86", "firstAnchor": { "contextRef": "D20251031_20251031_S000069130Member_ClassKMember_EquitySecuritiesRiskMember", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069130Member_ClassKMember_EquitySecuritiesRiskMember", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R87": { "role": "http://www.blackrock.com/17/role/PerformanceManagement", "longName": "1710006 - Disclosure - Class K [Member] Performance Management", "shortName": "Class K [Member] Performance Management", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "87", "firstAnchor": { "contextRef": "D20251031_20251031_S000069130Member_ClassKMember", "name": "oef:BarChartAndPerformanceTableHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069130Member_ClassKMember", "name": "oef:BarChartAndPerformanceTableHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R88": { "role": "http://www.blackrock.com/17/role/OperatingExpensesData", "longName": "1720020 - Disclosure - Class K [Member] Annual Fund Operating Expenses", "shortName": "Class K [Member] Annual Fund Operating Expenses", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "88", "firstAnchor": { "contextRef": "D20251031_20251031_S000069130Member_ClassKMember", "name": "oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "link:footnote", "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069130Member_ClassKMember", "name": "oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "link:footnote", "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R89": { "role": "http://www.blackrock.com/17/role/ExpenseExample", "longName": "1720030 - Disclosure - Class K [Member] Expense Example", "shortName": "Class K [Member] Expense Example", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "89", "firstAnchor": { "contextRef": "D20251031_20251031_S000069130Member_C000220954Member_ClassKMember", "name": "oef:ExpenseExampleYear01", "unitRef": "USD", "xsiNil": "false", "lang": null, "decimals": "INF", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069130Member_C000220954Member_ClassKMember", "name": "oef:ExpenseExampleYear01", "unitRef": "USD", "xsiNil": "false", "lang": null, "decimals": "INF", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R90": { "role": "http://www.blackrock.com/17/role/BarChartData", "longName": "1720050 - Disclosure - Class K [Member] Annual Total Returns", "shortName": "Class K [Member] Annual Total Returns", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "90", "firstAnchor": null, "uniqueAnchor": null }, "R91": { "role": "http://www.blackrock.com/17/role/PerformanceTableData", "longName": "1720060 - Disclosure - Class K [Member] Average Annual Total Returns", "shortName": "Class K [Member] Average Annual Total Returns", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "91", "firstAnchor": { "contextRef": "FY2025_ClassKMember_S000069130MSCIUSAIndexMember", "name": "oef:AvgAnnlRtrPct", "unitRef": "pure", "xsiNil": "false", "lang": null, "decimals": "4", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "FY2025_ClassKMember_S000069130MSCIUSAIndexMember", "name": "oef:AvgAnnlRtrPct", "unitRef": "pure", "xsiNil": "false", "lang": null, "decimals": "4", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R92": { "role": "http://www.blackrock.com/18/role/N1aCover", "longName": "1810000 - Disclosure - Class K [Member] N-1A Cover", "shortName": "Class K [Member] N-1A Cover", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "92", "firstAnchor": { "contextRef": "DefaultContext", "name": "dei:EntityRegistrantName", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true }, "uniqueAnchor": null }, "R93": { "role": "http://www.blackrock.com/18/role/RiskReturn", "longName": "1810002 - Disclosure - Class K [Member] Investment Objectives and Goals", "shortName": "Class K [Member] Investment Objectives and Goals", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "93", "firstAnchor": { "contextRef": "D20251031_20251031_S000069131Member_ClassKMember", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069131Member_ClassKMember", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R94": { "role": "http://www.blackrock.com/18/role/FeesAndExpenses", "longName": "1810003 - Disclosure - Class K [Member] Fees and Expenses", "shortName": "Class K [Member] Fees and Expenses", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "94", "firstAnchor": { "contextRef": "D20251031_20251031_S000069131Member_ClassKMember", "name": "oef:ExpenseHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069131Member_ClassKMember", "name": "oef:ExpenseHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R95": { "role": "http://www.blackrock.com/18/role/InvestmentStrategy", "longName": "1810004 - Disclosure - Class K [Member] Investment Strategy", "shortName": "Class K [Member] Investment Strategy", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "95", "firstAnchor": { "contextRef": "D20251031_20251031_S000069131Member_ClassKMember", "name": "oef:StrategyHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069131Member_ClassKMember", "name": "oef:StrategyHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R96": { "role": "http://www.blackrock.com/18/role/InvestmentRisks", "longName": "1810005 - Disclosure - Class K [Member] Investment Risks", "shortName": "Class K [Member] Investment Risks", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "96", "firstAnchor": { "contextRef": "D20251031_20251031_S000069131Member_ClassKMember_EquitySecuritiesRiskMember", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069131Member_ClassKMember_EquitySecuritiesRiskMember", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R97": { "role": "http://www.blackrock.com/18/role/PerformanceManagement", "longName": "1810006 - Disclosure - Class K [Member] Performance Management", "shortName": "Class K [Member] Performance Management", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "97", "firstAnchor": { "contextRef": "D20251031_20251031_S000069131Member_ClassKMember", "name": "oef:BarChartAndPerformanceTableHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069131Member_ClassKMember", "name": "oef:BarChartAndPerformanceTableHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R98": { "role": "http://www.blackrock.com/18/role/OperatingExpensesData", "longName": "1820020 - Disclosure - Class K [Member] Annual Fund Operating Expenses", "shortName": "Class K [Member] Annual Fund Operating Expenses", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "98", "firstAnchor": { "contextRef": "D20251031_20251031_S000069131Member_ClassKMember", "name": "oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "link:footnote", "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069131Member_ClassKMember", "name": "oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "link:footnote", "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R99": { "role": "http://www.blackrock.com/18/role/ExpenseExample", "longName": "1820030 - Disclosure - Class K [Member] Expense Example", "shortName": "Class K [Member] Expense Example", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "99", "firstAnchor": { "contextRef": "D20251031_20251031_S000069131Member_C000220957Member_ClassKMember", "name": "oef:ExpenseExampleYear01", "unitRef": "USD", "xsiNil": "false", "lang": null, "decimals": "INF", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069131Member_C000220957Member_ClassKMember", "name": "oef:ExpenseExampleYear01", "unitRef": "USD", "xsiNil": "false", "lang": null, "decimals": "INF", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R100": { "role": "http://www.blackrock.com/18/role/BarChartData", "longName": "1820050 - Disclosure - Class K [Member] Annual Total Returns", "shortName": "Class K [Member] Annual Total Returns", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "100", "firstAnchor": null, "uniqueAnchor": null }, "R101": { "role": "http://www.blackrock.com/18/role/PerformanceTableData", "longName": "1820060 - Disclosure - Class K [Member] Average Annual Total Returns", "shortName": "Class K [Member] Average Annual Total Returns", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "101", "firstAnchor": { "contextRef": "FY2025_ClassKMember_S000069131MSCIUSAIndexMember", "name": "oef:AvgAnnlRtrPct", "unitRef": "pure", "xsiNil": "false", "lang": null, "decimals": "4", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "FY2025_ClassKMember_S000069131MSCIUSAIndexMember", "name": "oef:AvgAnnlRtrPct", "unitRef": "pure", "xsiNil": "false", "lang": null, "decimals": "4", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R102": { "role": "http://www.blackrock.com/19/role/N1aCover", "longName": "1910000 - Disclosure - Class K [Member] N-1A Cover", "shortName": "Class K [Member] N-1A Cover", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "102", "firstAnchor": { "contextRef": "DefaultContext", "name": "dei:EntityRegistrantName", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true }, "uniqueAnchor": null }, "R103": { "role": "http://www.blackrock.com/19/role/RiskReturn", "longName": "1910002 - Disclosure - Class K [Member] Investment Objectives and Goals", "shortName": "Class K [Member] Investment Objectives and Goals", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "103", "firstAnchor": { "contextRef": "D20251031_20251031_S000069123Member_ClassKMember", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069123Member_ClassKMember", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R104": { "role": "http://www.blackrock.com/19/role/FeesAndExpenses", "longName": "1910003 - Disclosure - Class K [Member] Fees and Expenses", "shortName": "Class K [Member] Fees and Expenses", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "104", "firstAnchor": { "contextRef": "D20251031_20251031_S000069123Member_ClassKMember", "name": "oef:ExpenseHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069123Member_ClassKMember", "name": "oef:ExpenseHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R105": { "role": "http://www.blackrock.com/19/role/InvestmentStrategy", "longName": "1910004 - Disclosure - Class K [Member] Investment Strategy", "shortName": "Class K [Member] Investment Strategy", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "105", "firstAnchor": { "contextRef": "D20251031_20251031_S000069123Member_ClassKMember", "name": "oef:StrategyHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069123Member_ClassKMember", "name": "oef:StrategyHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R106": { "role": "http://www.blackrock.com/19/role/InvestmentRisks", "longName": "1910005 - Disclosure - Class K [Member] Investment Risks", "shortName": "Class K [Member] Investment Risks", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "106", "firstAnchor": { "contextRef": "D20251031_20251031_S000069123Member_ClassKMember_EquitySecuritiesRiskMember", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069123Member_ClassKMember_EquitySecuritiesRiskMember", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R107": { "role": "http://www.blackrock.com/19/role/PerformanceManagement", "longName": "1910006 - Disclosure - Class K [Member] Performance Management", "shortName": "Class K [Member] Performance Management", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "107", "firstAnchor": { "contextRef": "D20251031_20251031_S000069123Member_ClassKMember", "name": "oef:BarChartAndPerformanceTableHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069123Member_ClassKMember", "name": "oef:BarChartAndPerformanceTableHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R108": { "role": "http://www.blackrock.com/19/role/OperatingExpensesData", "longName": "1920020 - Disclosure - Class K [Member] Annual Fund Operating Expenses", "shortName": "Class K [Member] Annual Fund Operating Expenses", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "108", "firstAnchor": { "contextRef": "D20251031_20251031_S000069123Member_ClassKMember", "name": "oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "link:footnote", "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069123Member_ClassKMember", "name": "oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "link:footnote", "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R109": { "role": "http://www.blackrock.com/19/role/ExpenseExample", "longName": "1920030 - Disclosure - Class K [Member] Expense Example", "shortName": "Class K [Member] Expense Example", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "109", "firstAnchor": { "contextRef": "D20251031_20251031_S000069123Member_C000220933Member_ClassKMember", "name": "oef:ExpenseExampleYear01", "unitRef": "USD", "xsiNil": "false", "lang": null, "decimals": "INF", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069123Member_C000220933Member_ClassKMember", "name": "oef:ExpenseExampleYear01", "unitRef": "USD", "xsiNil": "false", "lang": null, "decimals": "INF", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R110": { "role": "http://www.blackrock.com/19/role/BarChartData", "longName": "1920050 - Disclosure - Class K [Member] Annual Total Returns", "shortName": "Class K [Member] Annual Total Returns", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "110", "firstAnchor": null, "uniqueAnchor": null }, "R111": { "role": "http://www.blackrock.com/19/role/PerformanceTableData", "longName": "1920060 - Disclosure - Class K [Member] Average Annual Total Returns", "shortName": "Class K [Member] Average Annual Total Returns", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "111", "firstAnchor": { "contextRef": "FY2025_ClassKMember_S000069123MSCIUSAIndex1Member", "name": "oef:AvgAnnlRtrPct", "unitRef": "pure", "xsiNil": "false", "lang": null, "decimals": "4", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "FY2025_ClassKMember_S000069123MSCIUSAIndex1Member", "name": "oef:AvgAnnlRtrPct", "unitRef": "pure", "xsiNil": "false", "lang": null, "decimals": "4", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R112": { "role": "http://www.blackrock.com/20/role/N1aCover", "longName": "2010000 - Disclosure - Class K [Member] N-1A Cover", "shortName": "Class K [Member] N-1A Cover", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "112", "firstAnchor": { "contextRef": "DefaultContext", "name": "dei:EntityRegistrantName", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true }, "uniqueAnchor": null }, "R113": { "role": "http://www.blackrock.com/20/role/RiskReturn", "longName": "2010002 - Disclosure - Class K [Member] Investment Objectives and Goals", "shortName": "Class K [Member] Investment Objectives and Goals", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "113", "firstAnchor": { "contextRef": "D20251031_20251031_S000086332Member_ClassKMember", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000086332Member_ClassKMember", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R114": { "role": "http://www.blackrock.com/20/role/FeesAndExpenses", "longName": "2010003 - Disclosure - Class K [Member] Fees and Expenses", "shortName": "Class K [Member] Fees and Expenses", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "114", "firstAnchor": { "contextRef": "D20251031_20251031_S000086332Member_ClassKMember", "name": "oef:ExpenseHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000086332Member_ClassKMember", "name": "oef:ExpenseHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R115": { "role": "http://www.blackrock.com/20/role/InvestmentStrategy", "longName": "2010004 - Disclosure - Class K [Member] Investment Strategy", "shortName": "Class K [Member] Investment Strategy", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "115", "firstAnchor": { "contextRef": "D20251031_20251031_S000086332Member_ClassKMember", "name": "oef:StrategyHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000086332Member_ClassKMember", "name": "oef:StrategyHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R116": { "role": "http://www.blackrock.com/20/role/InvestmentRisks", "longName": "2010005 - Disclosure - Class K [Member] Investment Risks", "shortName": "Class K [Member] Investment Risks", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "116", "firstAnchor": { "contextRef": "D20251031_20251031_S000086332Member_ClassKMember", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000086332Member_ClassKMember", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R117": { "role": "http://www.blackrock.com/20/role/PerformanceManagement", "longName": "2010006 - Disclosure - Class K [Member] Performance Management", "shortName": "Class K [Member] Performance Management", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "117", "firstAnchor": { "contextRef": "D20251031_20251031_S000086332Member_ClassKMember", "name": "oef:BarChartAndPerformanceTableHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000086332Member_ClassKMember", "name": "oef:BarChartAndPerformanceTableHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R118": { "role": "http://www.blackrock.com/20/role/OperatingExpensesData", "longName": "2020020 - Disclosure - Class K [Member] Annual Fund Operating Expenses", "shortName": "Class K [Member] Annual Fund Operating Expenses", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "118", "firstAnchor": { "contextRef": "D20251031_20251031_S000086332Member_ClassKMember", "name": "oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "link:footnote", "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000086332Member_ClassKMember", "name": "oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "link:footnote", "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R119": { "role": "http://www.blackrock.com/20/role/ExpenseExample", "longName": "2020030 - Disclosure - Class K [Member] Expense Example", "shortName": "Class K [Member] Expense Example", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "119", "firstAnchor": { "contextRef": "D20251031_20251031_S000086332Member_C000251819Member_ClassKMember", "name": "oef:ExpenseExampleYear01", "unitRef": "USD", "xsiNil": "false", "lang": null, "decimals": "INF", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000086332Member_C000251819Member_ClassKMember", "name": "oef:ExpenseExampleYear01", "unitRef": "USD", "xsiNil": "false", "lang": null, "decimals": "INF", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R120": { "role": "http://www.blackrock.com/20/role/BarChartData", "longName": "2020050 - Disclosure - Class K [Member] Annual Total Returns", "shortName": "Class K [Member] Annual Total Returns", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "120", "firstAnchor": null, "uniqueAnchor": null }, "R121": { "role": "http://www.blackrock.com/20/role/PerformanceTableData", "longName": "2020060 - Disclosure - Class K [Member] Average Annual Total Returns", "shortName": "Class K [Member] Average Annual Total Returns", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "121", "firstAnchor": { "contextRef": "FY2025_ClassKMember_S000086332MSCIUSAIndex2Member", "name": "oef:AvgAnnlRtrPct", "unitRef": "pure", "xsiNil": "false", "lang": null, "decimals": "4", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "FY2025_ClassKMember_S000086332MSCIUSAIndex2Member", "name": "oef:AvgAnnlRtrPct", "unitRef": "pure", "xsiNil": "false", "lang": null, "decimals": "4", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R122": { "role": "http://www.blackrock.com/2/role/N1aCover", "longName": "210000 - Disclosure - Investor A Institutional [Member] N-1A Cover", "shortName": "Investor A Institutional [Member] N-1A Cover", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "122", "firstAnchor": { "contextRef": "DefaultContext", "name": "dei:EntityRegistrantName", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true }, "uniqueAnchor": null }, "R123": { "role": "http://www.blackrock.com/2/role/RiskReturn", "longName": "210002 - Disclosure - Investor A Institutional [Member] Investment Objectives and Goals", "shortName": "Investor A Institutional [Member] Investment Objectives and Goals", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "123", "firstAnchor": { "contextRef": "D20251031_20251031_S000069125Member_InvestorAInstitutionalMember", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069125Member_InvestorAInstitutionalMember", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R124": { "role": "http://www.blackrock.com/2/role/FeesAndExpenses", "longName": "210003 - Disclosure - Investor A Institutional [Member] Fees and Expenses", "shortName": "Investor A Institutional [Member] Fees and Expenses", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "124", "firstAnchor": { "contextRef": "D20251031_20251031_S000069125Member_InvestorAInstitutionalMember", "name": "oef:ExpenseHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069125Member_InvestorAInstitutionalMember", "name": "oef:ExpenseHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R125": { "role": "http://www.blackrock.com/2/role/InvestmentStrategy", "longName": "210004 - Disclosure - Investor A Institutional [Member] Investment Strategy", "shortName": "Investor A Institutional [Member] Investment Strategy", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "125", "firstAnchor": { "contextRef": "D20251031_20251031_S000069125Member_InvestorAInstitutionalMember", "name": "oef:StrategyHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069125Member_InvestorAInstitutionalMember", "name": "oef:StrategyHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R126": { "role": "http://www.blackrock.com/2/role/InvestmentRisks", "longName": "210005 - Disclosure - Investor A Institutional [Member] Investment Risks", "shortName": "Investor A Institutional [Member] Investment Risks", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "126", "firstAnchor": { "contextRef": "D20251031_20251031_S000069125Member_InvestorAInstitutionalMember_EquitySecuritiesRiskMember", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069125Member_InvestorAInstitutionalMember_EquitySecuritiesRiskMember", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R127": { "role": "http://www.blackrock.com/2/role/PerformanceManagement", "longName": "210006 - Disclosure - Investor A Institutional [Member] Performance Management", "shortName": "Investor A Institutional [Member] Performance Management", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "127", "firstAnchor": { "contextRef": "D20251031_20251031_S000069125Member_InvestorAInstitutionalMember", "name": "oef:BarChartAndPerformanceTableHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069125Member_InvestorAInstitutionalMember", "name": "oef:BarChartAndPerformanceTableHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R128": { "role": "http://www.blackrock.com/2/role/OperatingExpensesData", "longName": "220020 - Disclosure - Investor A Institutional [Member] Annual Fund Operating Expenses", "shortName": "Investor A Institutional [Member] Annual Fund Operating Expenses", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "128", "firstAnchor": { "contextRef": "D20251031_20251031_S000069125Member_InvestorAInstitutionalMember", "name": "oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "link:footnote", "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069125Member_InvestorAInstitutionalMember", "name": "oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "link:footnote", "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R129": { "role": "http://www.blackrock.com/2/role/ExpenseExample", "longName": "220030 - Disclosure - Investor A Institutional [Member] Expense Example", "shortName": "Investor A Institutional [Member] Expense Example", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "129", "firstAnchor": { "contextRef": "D20251031_20251031_S000069125Member_C000220938Member_InvestorAInstitutionalMember", "name": "oef:ExpenseExampleYear01", "unitRef": "USD", "xsiNil": "false", "lang": null, "decimals": "INF", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069125Member_C000220938Member_InvestorAInstitutionalMember", "name": "oef:ExpenseExampleYear01", "unitRef": "USD", "xsiNil": "false", "lang": null, "decimals": "INF", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R130": { "role": "http://www.blackrock.com/2/role/BarChartData", "longName": "220050 - Disclosure - Investor A Institutional [Member] Annual Total Returns", "shortName": "Investor A Institutional [Member] Annual Total Returns", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "130", "firstAnchor": null, "uniqueAnchor": null }, "R131": { "role": "http://www.blackrock.com/2/role/PerformanceTableData", "longName": "220060 - Disclosure - Investor A Institutional [Member] Average Annual Total Returns", "shortName": "Investor A Institutional [Member] Average Annual Total Returns", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "131", "firstAnchor": { "contextRef": "FY2025_S000069125MSCIUSAIndexMember_InvestorAInstitutionalMember", "name": "oef:AvgAnnlRtrPct", "unitRef": "pure", "xsiNil": "false", "lang": null, "decimals": "4", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "FY2025_S000069125MSCIUSAIndexMember_InvestorAInstitutionalMember", "name": "oef:AvgAnnlRtrPct", "unitRef": "pure", "xsiNil": "false", "lang": null, "decimals": "4", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R132": { "role": "http://www.blackrock.com/3/role/N1aCover", "longName": "310000 - Disclosure - Investor A Institutional [Member] N-1A Cover", "shortName": "Investor A Institutional [Member] N-1A Cover", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "132", "firstAnchor": { "contextRef": "DefaultContext", "name": "dei:EntityRegistrantName", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true }, "uniqueAnchor": null }, "R133": { "role": "http://www.blackrock.com/3/role/RiskReturn", "longName": "310002 - Disclosure - Investor A Institutional [Member] Investment Objectives and Goals", "shortName": "Investor A Institutional [Member] Investment Objectives and Goals", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "133", "firstAnchor": { "contextRef": "D20251031_20251031_S000069126Member_InvestorAInstitutionalMember", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069126Member_InvestorAInstitutionalMember", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R134": { "role": "http://www.blackrock.com/3/role/FeesAndExpenses", "longName": "310003 - Disclosure - Investor A Institutional [Member] Fees and Expenses", "shortName": "Investor A Institutional [Member] Fees and Expenses", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "134", "firstAnchor": { "contextRef": "D20251031_20251031_S000069126Member_InvestorAInstitutionalMember", "name": "oef:ExpenseHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069126Member_InvestorAInstitutionalMember", "name": "oef:ExpenseHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R135": { "role": "http://www.blackrock.com/3/role/InvestmentStrategy", "longName": "310004 - Disclosure - Investor A Institutional [Member] Investment Strategy", "shortName": "Investor A Institutional [Member] Investment Strategy", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "135", "firstAnchor": { "contextRef": "D20251031_20251031_S000069126Member_InvestorAInstitutionalMember", "name": "oef:StrategyHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069126Member_InvestorAInstitutionalMember", "name": "oef:StrategyHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R136": { "role": "http://www.blackrock.com/3/role/InvestmentRisks", "longName": "310005 - Disclosure - Investor A Institutional [Member] Investment Risks", "shortName": "Investor A Institutional [Member] Investment Risks", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "136", "firstAnchor": { "contextRef": "D20251031_20251031_S000069126Member_InvestorAInstitutionalMember_EquitySecuritiesRiskMember", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069126Member_InvestorAInstitutionalMember_EquitySecuritiesRiskMember", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R137": { "role": "http://www.blackrock.com/3/role/PerformanceManagement", "longName": "310006 - Disclosure - Investor A Institutional [Member] Performance Management", "shortName": "Investor A Institutional [Member] Performance Management", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "137", "firstAnchor": { "contextRef": "D20251031_20251031_S000069126Member_InvestorAInstitutionalMember", "name": "oef:BarChartAndPerformanceTableHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069126Member_InvestorAInstitutionalMember", "name": "oef:BarChartAndPerformanceTableHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R138": { "role": "http://www.blackrock.com/3/role/OperatingExpensesData", "longName": "320020 - Disclosure - Investor A Institutional [Member] Annual Fund Operating Expenses", "shortName": "Investor A Institutional [Member] Annual Fund Operating Expenses", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "138", "firstAnchor": { "contextRef": "D20251031_20251031_S000069126Member_InvestorAInstitutionalMember", "name": "oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "link:footnote", "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069126Member_InvestorAInstitutionalMember", "name": "oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "link:footnote", "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R139": { "role": "http://www.blackrock.com/3/role/ExpenseExample", "longName": "320030 - Disclosure - Investor A Institutional [Member] Expense Example", "shortName": "Investor A Institutional [Member] Expense Example", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "139", "firstAnchor": { "contextRef": "D20251031_20251031_S000069126Member_C000220941Member_InvestorAInstitutionalMember", "name": "oef:ExpenseExampleYear01", "unitRef": "USD", "xsiNil": "false", "lang": null, "decimals": "INF", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069126Member_C000220941Member_InvestorAInstitutionalMember", "name": "oef:ExpenseExampleYear01", "unitRef": "USD", "xsiNil": "false", "lang": null, "decimals": "INF", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R140": { "role": "http://www.blackrock.com/3/role/BarChartData", "longName": "320050 - Disclosure - Investor A Institutional [Member] Annual Total Returns", "shortName": "Investor A Institutional [Member] Annual Total Returns", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "140", "firstAnchor": null, "uniqueAnchor": null }, "R141": { "role": "http://www.blackrock.com/3/role/PerformanceTableData", "longName": "320060 - Disclosure - Investor A Institutional [Member] Average Annual Total Returns", "shortName": "Investor A Institutional [Member] Average Annual Total Returns", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "141", "firstAnchor": { "contextRef": "FY2025_S000069126MSCIUSAIndexMember_InvestorAInstitutionalMember", "name": "oef:AvgAnnlRtrPct", "unitRef": "pure", "xsiNil": "false", "lang": null, "decimals": "4", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "FY2025_S000069126MSCIUSAIndexMember_InvestorAInstitutionalMember", "name": "oef:AvgAnnlRtrPct", "unitRef": "pure", "xsiNil": "false", "lang": null, "decimals": "4", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R142": { "role": "http://www.blackrock.com/4/role/N1aCover", "longName": "410000 - Disclosure - Investor A Institutional [Member] N-1A Cover", "shortName": "Investor A Institutional [Member] N-1A Cover", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "142", "firstAnchor": { "contextRef": "DefaultContext", "name": "dei:EntityRegistrantName", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true }, "uniqueAnchor": null }, "R143": { "role": "http://www.blackrock.com/4/role/RiskReturn", "longName": "410002 - Disclosure - Investor A Institutional [Member] Investment Objectives and Goals", "shortName": "Investor A Institutional [Member] Investment Objectives and Goals", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "143", "firstAnchor": { "contextRef": "D20251031_20251031_S000069127Member_InvestorAInstitutionalMember", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069127Member_InvestorAInstitutionalMember", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R144": { "role": "http://www.blackrock.com/4/role/FeesAndExpenses", "longName": "410003 - Disclosure - Investor A Institutional [Member] Fees and Expenses", "shortName": "Investor A Institutional [Member] Fees and Expenses", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "144", "firstAnchor": { "contextRef": "D20251031_20251031_S000069127Member_InvestorAInstitutionalMember", "name": "oef:ExpenseHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069127Member_InvestorAInstitutionalMember", "name": "oef:ExpenseHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R145": { "role": "http://www.blackrock.com/4/role/InvestmentStrategy", "longName": "410004 - Disclosure - Investor A Institutional [Member] Investment Strategy", "shortName": "Investor A Institutional [Member] Investment Strategy", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "145", "firstAnchor": { "contextRef": "D20251031_20251031_S000069127Member_InvestorAInstitutionalMember", "name": "oef:StrategyHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069127Member_InvestorAInstitutionalMember", "name": "oef:StrategyHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R146": { "role": "http://www.blackrock.com/4/role/InvestmentRisks", "longName": "410005 - Disclosure - Investor A Institutional [Member] Investment Risks", "shortName": "Investor A Institutional [Member] Investment Risks", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "146", "firstAnchor": { "contextRef": "D20251031_20251031_S000069127Member_InvestorAInstitutionalMember_EquitySecuritiesRiskMember", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069127Member_InvestorAInstitutionalMember_EquitySecuritiesRiskMember", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R147": { "role": "http://www.blackrock.com/4/role/PerformanceManagement", "longName": "410006 - Disclosure - Investor A Institutional [Member] Performance Management", "shortName": "Investor A Institutional [Member] Performance Management", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "147", "firstAnchor": { "contextRef": "D20251031_20251031_S000069127Member_InvestorAInstitutionalMember", "name": "oef:BarChartAndPerformanceTableHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069127Member_InvestorAInstitutionalMember", "name": "oef:BarChartAndPerformanceTableHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R148": { "role": "http://www.blackrock.com/4/role/OperatingExpensesData", "longName": "420020 - Disclosure - Investor A Institutional [Member] Annual Fund Operating Expenses", "shortName": "Investor A Institutional [Member] Annual Fund Operating Expenses", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "148", "firstAnchor": { "contextRef": "D20251031_20251031_S000069127Member_InvestorAInstitutionalMember", "name": "oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "link:footnote", "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069127Member_InvestorAInstitutionalMember", "name": "oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "link:footnote", "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R149": { "role": "http://www.blackrock.com/4/role/ExpenseExample", "longName": "420030 - Disclosure - Investor A Institutional [Member] Expense Example", "shortName": "Investor A Institutional [Member] Expense Example", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "149", "firstAnchor": { "contextRef": "D20251031_20251031_S000069127Member_C000220944Member_InvestorAInstitutionalMember", "name": "oef:ExpenseExampleYear01", "unitRef": "USD", "xsiNil": "false", "lang": null, "decimals": "INF", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069127Member_C000220944Member_InvestorAInstitutionalMember", "name": "oef:ExpenseExampleYear01", "unitRef": "USD", "xsiNil": "false", "lang": null, "decimals": "INF", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R150": { "role": "http://www.blackrock.com/4/role/BarChartData", "longName": "420050 - Disclosure - Investor A Institutional [Member] Annual Total Returns", "shortName": "Investor A Institutional [Member] Annual Total Returns", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "150", "firstAnchor": null, "uniqueAnchor": null }, "R151": { "role": "http://www.blackrock.com/4/role/PerformanceTableData", "longName": "420060 - Disclosure - Investor A Institutional [Member] Average Annual Total Returns", "shortName": "Investor A Institutional [Member] Average Annual Total Returns", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "151", "firstAnchor": { "contextRef": "FY2025_S000069127MSCIUSAIndexMember_InvestorAInstitutionalMember", "name": "oef:AvgAnnlRtrPct", "unitRef": "pure", "xsiNil": "false", "lang": null, "decimals": "4", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "FY2025_S000069127MSCIUSAIndexMember_InvestorAInstitutionalMember", "name": "oef:AvgAnnlRtrPct", "unitRef": "pure", "xsiNil": "false", "lang": null, "decimals": "4", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R152": { "role": "http://www.blackrock.com/5/role/N1aCover", "longName": "510000 - Disclosure - Investor A Institutional [Member] N-1A Cover", "shortName": "Investor A Institutional [Member] N-1A Cover", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "152", "firstAnchor": { "contextRef": "DefaultContext", "name": "dei:EntityRegistrantName", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true }, "uniqueAnchor": null }, "R153": { "role": "http://www.blackrock.com/5/role/RiskReturn", "longName": "510002 - Disclosure - Investor A Institutional [Member] Investment Objectives and Goals", "shortName": "Investor A Institutional [Member] Investment Objectives and Goals", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "153", "firstAnchor": { "contextRef": "D20251031_20251031_S000069128Member_InvestorAInstitutionalMember", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069128Member_InvestorAInstitutionalMember", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R154": { "role": "http://www.blackrock.com/5/role/FeesAndExpenses", "longName": "510003 - Disclosure - Investor A Institutional [Member] Fees and Expenses", "shortName": "Investor A Institutional [Member] Fees and Expenses", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "154", "firstAnchor": { "contextRef": "D20251031_20251031_S000069128Member_InvestorAInstitutionalMember", "name": "oef:ExpenseHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "span", "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069128Member_InvestorAInstitutionalMember", "name": "oef:ExpenseHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "span", "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R155": { "role": "http://www.blackrock.com/5/role/InvestmentStrategy", "longName": "510004 - Disclosure - Investor A Institutional [Member] Investment Strategy", "shortName": "Investor A Institutional [Member] Investment Strategy", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "155", "firstAnchor": { "contextRef": "D20251031_20251031_S000069128Member_InvestorAInstitutionalMember", "name": "oef:StrategyHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "span", "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069128Member_InvestorAInstitutionalMember", "name": "oef:StrategyHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "span", "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R156": { "role": "http://www.blackrock.com/5/role/InvestmentRisks", "longName": "510005 - Disclosure - Investor A Institutional [Member] Investment Risks", "shortName": "Investor A Institutional [Member] Investment Risks", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "156", "firstAnchor": { "contextRef": "D20251031_20251031_S000069128Member_InvestorAInstitutionalMember_EquitySecuritiesRiskMember", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069128Member_InvestorAInstitutionalMember_EquitySecuritiesRiskMember", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R157": { "role": "http://www.blackrock.com/5/role/PerformanceManagement", "longName": "510006 - Disclosure - Investor A Institutional [Member] Performance Management", "shortName": "Investor A Institutional [Member] Performance Management", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "157", "firstAnchor": { "contextRef": "D20251031_20251031_S000069128Member_InvestorAInstitutionalMember", "name": "oef:BarChartAndPerformanceTableHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "span", "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069128Member_InvestorAInstitutionalMember", "name": "oef:BarChartAndPerformanceTableHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "span", "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R158": { "role": "http://www.blackrock.com/5/role/OperatingExpensesData", "longName": "520020 - Disclosure - Investor A Institutional [Member] Annual Fund Operating Expenses", "shortName": "Investor A Institutional [Member] Annual Fund Operating Expenses", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "158", "firstAnchor": { "contextRef": "D20251031_20251031_S000069128Member_InvestorAInstitutionalMember", "name": "oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "link:footnote", "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069128Member_InvestorAInstitutionalMember", "name": "oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "link:footnote", "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R159": { "role": "http://www.blackrock.com/5/role/ExpenseExample", "longName": "520030 - Disclosure - Investor A Institutional [Member] Expense Example", "shortName": "Investor A Institutional [Member] Expense Example", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "159", "firstAnchor": { "contextRef": "D20251031_20251031_S000069128Member_C000220947Member_InvestorAInstitutionalMember", "name": "oef:ExpenseExampleYear01", "unitRef": "USD", "xsiNil": "false", "lang": null, "decimals": "INF", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069128Member_C000220947Member_InvestorAInstitutionalMember", "name": "oef:ExpenseExampleYear01", "unitRef": "USD", "xsiNil": "false", "lang": null, "decimals": "INF", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R160": { "role": "http://www.blackrock.com/5/role/BarChartData", "longName": "520050 - Disclosure - Investor A Institutional [Member] Annual Total Returns", "shortName": "Investor A Institutional [Member] Annual Total Returns", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "160", "firstAnchor": null, "uniqueAnchor": null }, "R161": { "role": "http://www.blackrock.com/5/role/PerformanceTableData", "longName": "520060 - Disclosure - Investor A Institutional [Member] Average Annual Total Returns", "shortName": "Investor A Institutional [Member] Average Annual Total Returns", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "161", "firstAnchor": { "contextRef": "FY2025_InvestorAInstitutionalMember_S000069128MSCIUSAIndexMember", "name": "oef:AvgAnnlRtrPct", "unitRef": "pure", "xsiNil": "false", "lang": null, "decimals": "4", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "FY2025_InvestorAInstitutionalMember_S000069128MSCIUSAIndexMember", "name": "oef:AvgAnnlRtrPct", "unitRef": "pure", "xsiNil": "false", "lang": null, "decimals": "4", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R162": { "role": "http://www.blackrock.com/6/role/N1aCover", "longName": "610000 - Disclosure - Investor A Institutional [Member] N-1A Cover", "shortName": "Investor A Institutional [Member] N-1A Cover", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "162", "firstAnchor": { "contextRef": "DefaultContext", "name": "dei:EntityRegistrantName", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true }, "uniqueAnchor": null }, "R163": { "role": "http://www.blackrock.com/6/role/RiskReturn", "longName": "610002 - Disclosure - Investor A Institutional [Member] Investment Objectives and Goals", "shortName": "Investor A Institutional [Member] Investment Objectives and Goals", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "163", "firstAnchor": { "contextRef": "D20251031_20251031_S000069129Member_InvestorAInstitutionalMember", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069129Member_InvestorAInstitutionalMember", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R164": { "role": "http://www.blackrock.com/6/role/FeesAndExpenses", "longName": "610003 - Disclosure - Investor A Institutional [Member] Fees and Expenses", "shortName": "Investor A Institutional [Member] Fees and Expenses", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "164", "firstAnchor": { "contextRef": "D20251031_20251031_S000069129Member_InvestorAInstitutionalMember", "name": "oef:ExpenseHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "span", "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069129Member_InvestorAInstitutionalMember", "name": "oef:ExpenseHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "span", "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R165": { "role": "http://www.blackrock.com/6/role/InvestmentStrategy", "longName": "610004 - Disclosure - Investor A Institutional [Member] Investment Strategy", "shortName": "Investor A Institutional [Member] Investment Strategy", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "165", "firstAnchor": { "contextRef": "D20251031_20251031_S000069129Member_InvestorAInstitutionalMember", "name": "oef:StrategyHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "span", "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069129Member_InvestorAInstitutionalMember", "name": "oef:StrategyHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "span", "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R166": { "role": "http://www.blackrock.com/6/role/InvestmentRisks", "longName": "610005 - Disclosure - Investor A Institutional [Member] Investment Risks", "shortName": "Investor A Institutional [Member] Investment Risks", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "166", "firstAnchor": { "contextRef": "D20251031_20251031_S000069129Member_InvestorAInstitutionalMember_EquitySecuritiesRiskMember", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069129Member_InvestorAInstitutionalMember_EquitySecuritiesRiskMember", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R167": { "role": "http://www.blackrock.com/6/role/PerformanceManagement", "longName": "610006 - Disclosure - Investor A Institutional [Member] Performance Management", "shortName": "Investor A Institutional [Member] Performance Management", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "167", "firstAnchor": { "contextRef": "D20251031_20251031_S000069129Member_InvestorAInstitutionalMember", "name": "oef:BarChartAndPerformanceTableHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "span", "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069129Member_InvestorAInstitutionalMember", "name": "oef:BarChartAndPerformanceTableHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "span", "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R168": { "role": "http://www.blackrock.com/6/role/OperatingExpensesData", "longName": "620020 - Disclosure - Investor A Institutional [Member] Annual Fund Operating Expenses", "shortName": "Investor A Institutional [Member] Annual Fund Operating Expenses", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "168", "firstAnchor": { "contextRef": "D20251031_20251031_S000069129Member_InvestorAInstitutionalMember", "name": "oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "link:footnote", "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069129Member_InvestorAInstitutionalMember", "name": "oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "link:footnote", "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R169": { "role": "http://www.blackrock.com/6/role/ExpenseExample", "longName": "620030 - Disclosure - Investor A Institutional [Member] Expense Example", "shortName": "Investor A Institutional [Member] Expense Example", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "169", "firstAnchor": { "contextRef": "D20251031_20251031_S000069129Member_C000220950Member_InvestorAInstitutionalMember", "name": "oef:ExpenseExampleYear01", "unitRef": "USD", "xsiNil": "false", "lang": null, "decimals": "INF", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069129Member_C000220950Member_InvestorAInstitutionalMember", "name": "oef:ExpenseExampleYear01", "unitRef": "USD", "xsiNil": "false", "lang": null, "decimals": "INF", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R170": { "role": "http://www.blackrock.com/6/role/BarChartData", "longName": "620050 - Disclosure - Investor A Institutional [Member] Annual Total Returns", "shortName": "Investor A Institutional [Member] Annual Total Returns", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "170", "firstAnchor": null, "uniqueAnchor": null }, "R171": { "role": "http://www.blackrock.com/6/role/PerformanceTableData", "longName": "620060 - Disclosure - Investor A Institutional [Member] Average Annual Total Returns", "shortName": "Investor A Institutional [Member] Average Annual Total Returns", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "171", "firstAnchor": { "contextRef": "FY2025_InvestorAInstitutionalMember_S000069129MSCIUSAIndexMember", "name": "oef:AvgAnnlRtrPct", "unitRef": "pure", "xsiNil": "false", "lang": null, "decimals": "4", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "FY2025_InvestorAInstitutionalMember_S000069129MSCIUSAIndexMember", "name": "oef:AvgAnnlRtrPct", "unitRef": "pure", "xsiNil": "false", "lang": null, "decimals": "4", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R172": { "role": "http://www.blackrock.com/7/role/N1aCover", "longName": "710000 - Disclosure - Investor A Institutional [Member] N-1A Cover", "shortName": "Investor A Institutional [Member] N-1A Cover", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "172", "firstAnchor": { "contextRef": "DefaultContext", "name": "dei:EntityRegistrantName", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true }, "uniqueAnchor": null }, "R173": { "role": "http://www.blackrock.com/7/role/RiskReturn", "longName": "710002 - Disclosure - Investor A Institutional [Member] Investment Objectives and Goals", "shortName": "Investor A Institutional [Member] Investment Objectives and Goals", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "173", "firstAnchor": { "contextRef": "D20251031_20251031_S000069130Member_InvestorAInstitutionalMember", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069130Member_InvestorAInstitutionalMember", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R174": { "role": "http://www.blackrock.com/7/role/FeesAndExpenses", "longName": "710003 - Disclosure - Investor A Institutional [Member] Fees and Expenses", "shortName": "Investor A Institutional [Member] Fees and Expenses", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "174", "firstAnchor": { "contextRef": "D20251031_20251031_S000069130Member_InvestorAInstitutionalMember", "name": "oef:ExpenseHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069130Member_InvestorAInstitutionalMember", "name": "oef:ExpenseHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R175": { "role": "http://www.blackrock.com/7/role/InvestmentStrategy", "longName": "710004 - Disclosure - Investor A Institutional [Member] Investment Strategy", "shortName": "Investor A Institutional [Member] Investment Strategy", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "175", "firstAnchor": { "contextRef": "D20251031_20251031_S000069130Member_InvestorAInstitutionalMember", "name": "oef:StrategyHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069130Member_InvestorAInstitutionalMember", "name": "oef:StrategyHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R176": { "role": "http://www.blackrock.com/7/role/InvestmentRisks", "longName": "710005 - Disclosure - Investor A Institutional [Member] Investment Risks", "shortName": "Investor A Institutional [Member] Investment Risks", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "176", "firstAnchor": { "contextRef": "D20251031_20251031_S000069130Member_InvestorAInstitutionalMember_EquitySecuritiesRiskMember", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069130Member_InvestorAInstitutionalMember_EquitySecuritiesRiskMember", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R177": { "role": "http://www.blackrock.com/7/role/PerformanceManagement", "longName": "710006 - Disclosure - Investor A Institutional [Member] Performance Management", "shortName": "Investor A Institutional [Member] Performance Management", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "177", "firstAnchor": { "contextRef": "D20251031_20251031_S000069130Member_InvestorAInstitutionalMember", "name": "oef:BarChartAndPerformanceTableHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069130Member_InvestorAInstitutionalMember", "name": "oef:BarChartAndPerformanceTableHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R178": { "role": "http://www.blackrock.com/7/role/OperatingExpensesData", "longName": "720020 - Disclosure - Investor A Institutional [Member] Annual Fund Operating Expenses", "shortName": "Investor A Institutional [Member] Annual Fund Operating Expenses", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "178", "firstAnchor": { "contextRef": "D20251031_20251031_S000069130Member_InvestorAInstitutionalMember", "name": "oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "link:footnote", "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069130Member_InvestorAInstitutionalMember", "name": "oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "link:footnote", "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R179": { "role": "http://www.blackrock.com/7/role/ExpenseExample", "longName": "720030 - Disclosure - Investor A Institutional [Member] Expense Example", "shortName": "Investor A Institutional [Member] Expense Example", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "179", "firstAnchor": { "contextRef": "D20251031_20251031_S000069130Member_C000220953Member_InvestorAInstitutionalMember", "name": "oef:ExpenseExampleYear01", "unitRef": "USD", "xsiNil": "false", "lang": null, "decimals": "INF", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069130Member_C000220953Member_InvestorAInstitutionalMember", "name": "oef:ExpenseExampleYear01", "unitRef": "USD", "xsiNil": "false", "lang": null, "decimals": "INF", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R180": { "role": "http://www.blackrock.com/7/role/BarChartData", "longName": "720050 - Disclosure - Investor A Institutional [Member] Annual Total Returns", "shortName": "Investor A Institutional [Member] Annual Total Returns", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "180", "firstAnchor": null, "uniqueAnchor": null }, "R181": { "role": "http://www.blackrock.com/7/role/PerformanceTableData", "longName": "720060 - Disclosure - Investor A Institutional [Member] Average Annual Total Returns", "shortName": "Investor A Institutional [Member] Average Annual Total Returns", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "181", "firstAnchor": { "contextRef": "FY2025_InvestorAInstitutionalMember_S000069130MSCIUSAIndexMember", "name": "oef:AvgAnnlRtrPct", "unitRef": "pure", "xsiNil": "false", "lang": null, "decimals": "4", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "FY2025_InvestorAInstitutionalMember_S000069130MSCIUSAIndexMember", "name": "oef:AvgAnnlRtrPct", "unitRef": "pure", "xsiNil": "false", "lang": null, "decimals": "4", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R182": { "role": "http://www.blackrock.com/8/role/N1aCover", "longName": "810000 - Disclosure - Investor A Institutional [Member] N-1A Cover", "shortName": "Investor A Institutional [Member] N-1A Cover", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "182", "firstAnchor": { "contextRef": "DefaultContext", "name": "dei:EntityRegistrantName", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true }, "uniqueAnchor": null }, "R183": { "role": "http://www.blackrock.com/8/role/RiskReturn", "longName": "810002 - Disclosure - Investor A Institutional [Member] Investment Objectives and Goals", "shortName": "Investor A Institutional [Member] Investment Objectives and Goals", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "183", "firstAnchor": { "contextRef": "D20251031_20251031_S000069131Member_InvestorAInstitutionalMember", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069131Member_InvestorAInstitutionalMember", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R184": { "role": "http://www.blackrock.com/8/role/FeesAndExpenses", "longName": "810003 - Disclosure - Investor A Institutional [Member] Fees and Expenses", "shortName": "Investor A Institutional [Member] Fees and Expenses", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "184", "firstAnchor": { "contextRef": "D20251031_20251031_S000069131Member_InvestorAInstitutionalMember", "name": "oef:ExpenseHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069131Member_InvestorAInstitutionalMember", "name": "oef:ExpenseHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R185": { "role": "http://www.blackrock.com/8/role/InvestmentStrategy", "longName": "810004 - Disclosure - Investor A Institutional [Member] Investment Strategy", "shortName": "Investor A Institutional [Member] Investment Strategy", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "185", "firstAnchor": { "contextRef": "D20251031_20251031_S000069131Member_InvestorAInstitutionalMember", "name": "oef:StrategyHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069131Member_InvestorAInstitutionalMember", "name": "oef:StrategyHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R186": { "role": "http://www.blackrock.com/8/role/InvestmentRisks", "longName": "810005 - Disclosure - Investor A Institutional [Member] Investment Risks", "shortName": "Investor A Institutional [Member] Investment Risks", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "186", "firstAnchor": { "contextRef": "D20251031_20251031_S000069131Member_InvestorAInstitutionalMember_EquitySecuritiesRiskMember", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069131Member_InvestorAInstitutionalMember_EquitySecuritiesRiskMember", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R187": { "role": "http://www.blackrock.com/8/role/PerformanceManagement", "longName": "810006 - Disclosure - Investor A Institutional [Member] Performance Management", "shortName": "Investor A Institutional [Member] Performance Management", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "187", "firstAnchor": { "contextRef": "D20251031_20251031_S000069131Member_InvestorAInstitutionalMember", "name": "oef:BarChartAndPerformanceTableHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069131Member_InvestorAInstitutionalMember", "name": "oef:BarChartAndPerformanceTableHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R188": { "role": "http://www.blackrock.com/8/role/OperatingExpensesData", "longName": "820020 - Disclosure - Investor A Institutional [Member] Annual Fund Operating Expenses", "shortName": "Investor A Institutional [Member] Annual Fund Operating Expenses", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "188", "firstAnchor": { "contextRef": "D20251031_20251031_S000069131Member_InvestorAInstitutionalMember", "name": "oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "link:footnote", "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069131Member_InvestorAInstitutionalMember", "name": "oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "link:footnote", "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R189": { "role": "http://www.blackrock.com/8/role/ExpenseExample", "longName": "820030 - Disclosure - Investor A Institutional [Member] Expense Example", "shortName": "Investor A Institutional [Member] Expense Example", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "189", "firstAnchor": { "contextRef": "D20251031_20251031_S000069131Member_C000220956Member_InvestorAInstitutionalMember", "name": "oef:ExpenseExampleYear01", "unitRef": "USD", "xsiNil": "false", "lang": null, "decimals": "INF", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069131Member_C000220956Member_InvestorAInstitutionalMember", "name": "oef:ExpenseExampleYear01", "unitRef": "USD", "xsiNil": "false", "lang": null, "decimals": "INF", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R190": { "role": "http://www.blackrock.com/8/role/BarChartData", "longName": "820050 - Disclosure - Investor A Institutional [Member] Annual Total Returns", "shortName": "Investor A Institutional [Member] Annual Total Returns", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "190", "firstAnchor": null, "uniqueAnchor": null }, "R191": { "role": "http://www.blackrock.com/8/role/PerformanceTableData", "longName": "820060 - Disclosure - Investor A Institutional [Member] Average Annual Total Returns", "shortName": "Investor A Institutional [Member] Average Annual Total Returns", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "191", "firstAnchor": { "contextRef": "FY2025_InvestorAInstitutionalMember_S000069131MSCIUSAIndexMember", "name": "oef:AvgAnnlRtrPct", "unitRef": "pure", "xsiNil": "false", "lang": null, "decimals": "4", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "FY2025_InvestorAInstitutionalMember_S000069131MSCIUSAIndexMember", "name": "oef:AvgAnnlRtrPct", "unitRef": "pure", "xsiNil": "false", "lang": null, "decimals": "4", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R192": { "role": "http://www.blackrock.com/9/role/N1aCover", "longName": "910000 - Disclosure - Investor A Institutional [Member] N-1A Cover", "shortName": "Investor A Institutional [Member] N-1A Cover", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "192", "firstAnchor": { "contextRef": "DefaultContext", "name": "dei:EntityRegistrantName", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true }, "uniqueAnchor": null }, "R193": { "role": "http://www.blackrock.com/9/role/RiskReturn", "longName": "910002 - Disclosure - Investor A Institutional [Member] Investment Objectives and Goals", "shortName": "Investor A Institutional [Member] Investment Objectives and Goals", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "193", "firstAnchor": { "contextRef": "D20251031_20251031_S000069123Member_InvestorAInstitutionalMember", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069123Member_InvestorAInstitutionalMember", "name": "oef:RiskReturnHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R194": { "role": "http://www.blackrock.com/9/role/FeesAndExpenses", "longName": "910003 - Disclosure - Investor A Institutional [Member] Fees and Expenses", "shortName": "Investor A Institutional [Member] Fees and Expenses", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "194", "firstAnchor": { "contextRef": "D20251031_20251031_S000069123Member_InvestorAInstitutionalMember", "name": "oef:ExpenseHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069123Member_InvestorAInstitutionalMember", "name": "oef:ExpenseHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R195": { "role": "http://www.blackrock.com/9/role/InvestmentStrategy", "longName": "910004 - Disclosure - Investor A Institutional [Member] Investment Strategy", "shortName": "Investor A Institutional [Member] Investment Strategy", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "195", "firstAnchor": { "contextRef": "D20251031_20251031_S000069123Member_InvestorAInstitutionalMember", "name": "oef:StrategyHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "span", "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069123Member_InvestorAInstitutionalMember", "name": "oef:StrategyHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "span", "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R196": { "role": "http://www.blackrock.com/9/role/InvestmentRisks", "longName": "910005 - Disclosure - Investor A Institutional [Member] Investment Risks", "shortName": "Investor A Institutional [Member] Investment Risks", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "196", "firstAnchor": { "contextRef": "D20251031_20251031_S000069123Member_InvestorAInstitutionalMember", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069123Member_InvestorAInstitutionalMember", "name": "oef:RiskTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R197": { "role": "http://www.blackrock.com/9/role/PerformanceManagement", "longName": "910006 - Disclosure - Investor A Institutional [Member] Performance Management", "shortName": "Investor A Institutional [Member] Performance Management", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "197", "firstAnchor": { "contextRef": "D20251031_20251031_S000069123Member_InvestorAInstitutionalMember", "name": "oef:BarChartAndPerformanceTableHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069123Member_InvestorAInstitutionalMember", "name": "oef:BarChartAndPerformanceTableHeading", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R198": { "role": "http://www.blackrock.com/9/role/OperatingExpensesData", "longName": "920020 - Disclosure - Investor A Institutional [Member] Annual Fund Operating Expenses", "shortName": "Investor A Institutional [Member] Annual Fund Operating Expenses", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "198", "firstAnchor": { "contextRef": "D20251031_20251031_S000069123Member_InvestorAInstitutionalMember", "name": "oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "link:footnote", "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069123Member_InvestorAInstitutionalMember", "name": "oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "link:footnote", "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R199": { "role": "http://www.blackrock.com/9/role/ExpenseExample", "longName": "920030 - Disclosure - Investor A Institutional [Member] Expense Example", "shortName": "Investor A Institutional [Member] Expense Example", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "199", "firstAnchor": { "contextRef": "D20251031_20251031_S000069123Member_C000220932Member_InvestorAInstitutionalMember", "name": "oef:ExpenseExampleYear01", "unitRef": "USD", "xsiNil": "false", "lang": null, "decimals": "INF", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "D20251031_20251031_S000069123Member_C000220932Member_InvestorAInstitutionalMember", "name": "oef:ExpenseExampleYear01", "unitRef": "USD", "xsiNil": "false", "lang": null, "decimals": "INF", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } }, "R200": { "role": "http://www.blackrock.com/9/role/BarChartData", "longName": "920050 - Disclosure - Investor A Institutional [Member] Annual Total Returns", "shortName": "Investor A Institutional [Member] Annual Total Returns", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "200", "firstAnchor": null, "uniqueAnchor": null }, "R201": { "role": "http://www.blackrock.com/9/role/PerformanceTableData", "longName": "920060 - Disclosure - Investor A Institutional [Member] Average Annual Total Returns", "shortName": "Investor A Institutional [Member] Average Annual Total Returns", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Risk/Return", "order": "201", "firstAnchor": { "contextRef": "FY2025_InvestorAInstitutionalMember_S000069123MSCIUSAIndexMember", "name": "oef:AvgAnnlRtrPct", "unitRef": "pure", "xsiNil": "false", "lang": null, "decimals": "4", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "FY2025_InvestorAInstitutionalMember_S000069123MSCIUSAIndexMember", "name": "oef:AvgAnnlRtrPct", "unitRef": "pure", "xsiNil": "false", "lang": null, "decimals": "4", "ancestors": [ "td", "tr", "table", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d34357d485bpos.htm", "first": true, "unique": true } } }, "tag": { "oef_AcquiredFundFeesAndExpensesBasedOnEstimates": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "AcquiredFundFeesAndExpensesBasedOnEstimates", "presentation": [ "http://www.blackrock.com/1/role/FeesAndExpenses", "http://www.blackrock.com/10/role/FeesAndExpenses", "http://www.blackrock.com/11/role/FeesAndExpenses", "http://www.blackrock.com/12/role/FeesAndExpenses", "http://www.blackrock.com/13/role/FeesAndExpenses", "http://www.blackrock.com/14/role/FeesAndExpenses", "http://www.blackrock.com/15/role/FeesAndExpenses", "http://www.blackrock.com/16/role/FeesAndExpenses", "http://www.blackrock.com/17/role/FeesAndExpenses", "http://www.blackrock.com/18/role/FeesAndExpenses", "http://www.blackrock.com/19/role/FeesAndExpenses", "http://www.blackrock.com/2/role/FeesAndExpenses", "http://www.blackrock.com/20/role/FeesAndExpenses", "http://www.blackrock.com/3/role/FeesAndExpenses", "http://www.blackrock.com/4/role/FeesAndExpenses", "http://www.blackrock.com/5/role/FeesAndExpenses", "http://www.blackrock.com/6/role/FeesAndExpenses", "http://www.blackrock.com/7/role/FeesAndExpenses", "http://www.blackrock.com/8/role/FeesAndExpenses", "http://www.blackrock.com/9/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/FeesAndExpenses" ], "lang": { "en-us": { "role": { "label": "Acquired Fund Fees and Expenses, Based on Estimates [Text]" } } }, "auth_ref": [ "r28" ] }, "oef_AcquiredFundFeesAndExpensesOverAssets": { "xbrltype": "nonNegativePure4ItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "AcquiredFundFeesAndExpensesOverAssets", "calculation": { "http://xbrl.sec.gov/rr/role/OperatingExpensesData": { "parentTag": "oef_ExpensesOverAssets", "weight": 1.0, "order": 5.0 } }, "presentation": [ "http://www.blackrock.com/1/role/OperatingExpensesData", "http://www.blackrock.com/10/role/OperatingExpensesData", "http://www.blackrock.com/11/role/OperatingExpensesData", "http://www.blackrock.com/12/role/OperatingExpensesData", "http://www.blackrock.com/13/role/OperatingExpensesData", "http://www.blackrock.com/14/role/OperatingExpensesData", "http://www.blackrock.com/15/role/OperatingExpensesData", "http://www.blackrock.com/16/role/OperatingExpensesData", "http://www.blackrock.com/17/role/OperatingExpensesData", "http://www.blackrock.com/18/role/OperatingExpensesData", "http://www.blackrock.com/19/role/OperatingExpensesData", "http://www.blackrock.com/2/role/OperatingExpensesData", "http://www.blackrock.com/20/role/OperatingExpensesData", "http://www.blackrock.com/3/role/OperatingExpensesData", "http://www.blackrock.com/4/role/OperatingExpensesData", "http://www.blackrock.com/5/role/OperatingExpensesData", "http://www.blackrock.com/6/role/OperatingExpensesData", "http://www.blackrock.com/7/role/OperatingExpensesData", "http://www.blackrock.com/8/role/OperatingExpensesData", "http://www.blackrock.com/9/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/OperatingExpensesData" ], "lang": { "en-us": { "role": { "label": "Acquired Fund Fees and Expenses" } } }, "auth_ref": [ "r27" ] }, "bf3_AffiliatedFundRiskMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "AffiliatedFundRiskMember", "presentation": [ "http://www.blackrock.com/1/role/InvestmentRisks", "http://www.blackrock.com/10/role/InvestmentRisks", "http://www.blackrock.com/11/role/InvestmentRisks", "http://www.blackrock.com/12/role/InvestmentRisks", "http://www.blackrock.com/13/role/InvestmentRisks", "http://www.blackrock.com/14/role/InvestmentRisks", "http://www.blackrock.com/15/role/InvestmentRisks", "http://www.blackrock.com/16/role/InvestmentRisks", "http://www.blackrock.com/17/role/InvestmentRisks", "http://www.blackrock.com/18/role/InvestmentRisks", "http://www.blackrock.com/19/role/InvestmentRisks", "http://www.blackrock.com/2/role/InvestmentRisks", "http://www.blackrock.com/20/role/InvestmentRisks", "http://www.blackrock.com/3/role/InvestmentRisks", "http://www.blackrock.com/4/role/InvestmentRisks", "http://www.blackrock.com/5/role/InvestmentRisks", "http://www.blackrock.com/6/role/InvestmentRisks", "http://www.blackrock.com/7/role/InvestmentRisks", "http://www.blackrock.com/8/role/InvestmentRisks", "http://www.blackrock.com/9/role/InvestmentRisks" ], "lang": { "en-us": { "role": { "label": "Affiliated Fund Risk [Member]" } } }, "auth_ref": [] }, "oef_AfterTaxesOnDistributionsAndSalesMember": { "xbrltype": "domainItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "AfterTaxesOnDistributionsAndSalesMember", "presentation": [ "http://www.blackrock.com/1/role/PerformanceTableData", "http://www.blackrock.com/10/role/PerformanceTableData", "http://www.blackrock.com/11/role/PerformanceTableData", "http://www.blackrock.com/12/role/PerformanceTableData", "http://www.blackrock.com/13/role/PerformanceTableData", "http://www.blackrock.com/14/role/PerformanceTableData", "http://www.blackrock.com/15/role/PerformanceTableData", "http://www.blackrock.com/16/role/PerformanceTableData", "http://www.blackrock.com/17/role/PerformanceTableData", "http://www.blackrock.com/18/role/PerformanceTableData", "http://www.blackrock.com/19/role/PerformanceTableData", "http://www.blackrock.com/2/role/PerformanceTableData", "http://www.blackrock.com/20/role/PerformanceTableData", "http://www.blackrock.com/3/role/PerformanceTableData", "http://www.blackrock.com/4/role/PerformanceTableData", "http://www.blackrock.com/5/role/PerformanceTableData", "http://www.blackrock.com/6/role/PerformanceTableData", "http://www.blackrock.com/7/role/PerformanceTableData", "http://www.blackrock.com/8/role/PerformanceTableData", "http://www.blackrock.com/9/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "After Taxes on Distributions and Sales" } } }, "auth_ref": [ "r48" ] }, "oef_AfterTaxesOnDistributionsMember": { "xbrltype": "domainItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "AfterTaxesOnDistributionsMember", "presentation": [ "http://www.blackrock.com/1/role/PerformanceTableData", "http://www.blackrock.com/10/role/PerformanceTableData", "http://www.blackrock.com/11/role/PerformanceTableData", "http://www.blackrock.com/12/role/PerformanceTableData", "http://www.blackrock.com/13/role/PerformanceTableData", "http://www.blackrock.com/14/role/PerformanceTableData", "http://www.blackrock.com/15/role/PerformanceTableData", "http://www.blackrock.com/16/role/PerformanceTableData", "http://www.blackrock.com/17/role/PerformanceTableData", "http://www.blackrock.com/18/role/PerformanceTableData", "http://www.blackrock.com/19/role/PerformanceTableData", "http://www.blackrock.com/2/role/PerformanceTableData", "http://www.blackrock.com/20/role/PerformanceTableData", "http://www.blackrock.com/3/role/PerformanceTableData", "http://www.blackrock.com/4/role/PerformanceTableData", "http://www.blackrock.com/5/role/PerformanceTableData", "http://www.blackrock.com/6/role/PerformanceTableData", "http://www.blackrock.com/7/role/PerformanceTableData", "http://www.blackrock.com/8/role/PerformanceTableData", "http://www.blackrock.com/9/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "After Taxes on Distributions" } } }, "auth_ref": [ "r48" ] }, "oef_AllCoregistrantsMember": { "xbrltype": "domainItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "AllCoregistrantsMember", "presentation": [ "http://www.blackrock.com/1/role/BarChartData", "http://www.blackrock.com/1/role/ExpenseExample", "http://www.blackrock.com/1/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/1/role/FeesAndExpenses", "http://www.blackrock.com/1/role/InvestmentRisks", "http://www.blackrock.com/1/role/InvestmentStrategy", "http://www.blackrock.com/1/role/N1aCover", "http://www.blackrock.com/1/role/N1aSupplement", "http://www.blackrock.com/1/role/OperatingExpensesData", "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/1/role/PerformanceTableData", "http://www.blackrock.com/1/role/RiskReturn", "http://www.blackrock.com/1/role/ShareholderFeesData", "http://www.blackrock.com/10/role/BarChartData", "http://www.blackrock.com/10/role/ExpenseExample", "http://www.blackrock.com/10/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/10/role/FeesAndExpenses", "http://www.blackrock.com/10/role/InvestmentRisks", "http://www.blackrock.com/10/role/InvestmentStrategy", "http://www.blackrock.com/10/role/N1aCover", "http://www.blackrock.com/10/role/N1aSupplement", "http://www.blackrock.com/10/role/OperatingExpensesData", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/10/role/PerformanceTableData", "http://www.blackrock.com/10/role/RiskReturn", "http://www.blackrock.com/10/role/ShareholderFeesData", "http://www.blackrock.com/11/role/BarChartData", "http://www.blackrock.com/11/role/ExpenseExample", "http://www.blackrock.com/11/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/11/role/FeesAndExpenses", "http://www.blackrock.com/11/role/InvestmentRisks", "http://www.blackrock.com/11/role/InvestmentStrategy", "http://www.blackrock.com/11/role/N1aCover", "http://www.blackrock.com/11/role/N1aSupplement", "http://www.blackrock.com/11/role/OperatingExpensesData", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/11/role/PerformanceTableData", "http://www.blackrock.com/11/role/RiskReturn", "http://www.blackrock.com/11/role/ShareholderFeesData", "http://www.blackrock.com/12/role/BarChartData", "http://www.blackrock.com/12/role/ExpenseExample", "http://www.blackrock.com/12/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/12/role/FeesAndExpenses", "http://www.blackrock.com/12/role/InvestmentRisks", "http://www.blackrock.com/12/role/InvestmentStrategy", "http://www.blackrock.com/12/role/N1aCover", "http://www.blackrock.com/12/role/N1aSupplement", "http://www.blackrock.com/12/role/OperatingExpensesData", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/12/role/PerformanceTableData", "http://www.blackrock.com/12/role/RiskReturn", "http://www.blackrock.com/12/role/ShareholderFeesData", "http://www.blackrock.com/13/role/BarChartData", "http://www.blackrock.com/13/role/ExpenseExample", "http://www.blackrock.com/13/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/13/role/FeesAndExpenses", "http://www.blackrock.com/13/role/InvestmentRisks", "http://www.blackrock.com/13/role/InvestmentStrategy", "http://www.blackrock.com/13/role/N1aCover", "http://www.blackrock.com/13/role/N1aSupplement", "http://www.blackrock.com/13/role/OperatingExpensesData", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/13/role/PerformanceTableData", "http://www.blackrock.com/13/role/RiskReturn", "http://www.blackrock.com/13/role/ShareholderFeesData", "http://www.blackrock.com/14/role/BarChartData", "http://www.blackrock.com/14/role/ExpenseExample", "http://www.blackrock.com/14/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/14/role/FeesAndExpenses", "http://www.blackrock.com/14/role/InvestmentRisks", "http://www.blackrock.com/14/role/InvestmentStrategy", "http://www.blackrock.com/14/role/N1aCover", "http://www.blackrock.com/14/role/N1aSupplement", "http://www.blackrock.com/14/role/OperatingExpensesData", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/14/role/PerformanceTableData", "http://www.blackrock.com/14/role/RiskReturn", "http://www.blackrock.com/14/role/ShareholderFeesData", "http://www.blackrock.com/15/role/BarChartData", "http://www.blackrock.com/15/role/ExpenseExample", "http://www.blackrock.com/15/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/15/role/FeesAndExpenses", "http://www.blackrock.com/15/role/InvestmentRisks", "http://www.blackrock.com/15/role/InvestmentStrategy", "http://www.blackrock.com/15/role/N1aCover", "http://www.blackrock.com/15/role/N1aSupplement", "http://www.blackrock.com/15/role/OperatingExpensesData", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/15/role/PerformanceTableData", "http://www.blackrock.com/15/role/RiskReturn", "http://www.blackrock.com/15/role/ShareholderFeesData", "http://www.blackrock.com/16/role/BarChartData", "http://www.blackrock.com/16/role/ExpenseExample", "http://www.blackrock.com/16/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/16/role/FeesAndExpenses", "http://www.blackrock.com/16/role/InvestmentRisks", "http://www.blackrock.com/16/role/InvestmentStrategy", "http://www.blackrock.com/16/role/N1aCover", "http://www.blackrock.com/16/role/N1aSupplement", "http://www.blackrock.com/16/role/OperatingExpensesData", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/16/role/PerformanceTableData", "http://www.blackrock.com/16/role/RiskReturn", "http://www.blackrock.com/16/role/ShareholderFeesData", "http://www.blackrock.com/17/role/BarChartData", "http://www.blackrock.com/17/role/ExpenseExample", "http://www.blackrock.com/17/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/17/role/FeesAndExpenses", "http://www.blackrock.com/17/role/InvestmentRisks", "http://www.blackrock.com/17/role/InvestmentStrategy", "http://www.blackrock.com/17/role/N1aCover", "http://www.blackrock.com/17/role/N1aSupplement", "http://www.blackrock.com/17/role/OperatingExpensesData", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/17/role/PerformanceTableData", "http://www.blackrock.com/17/role/RiskReturn", "http://www.blackrock.com/17/role/ShareholderFeesData", "http://www.blackrock.com/18/role/BarChartData", "http://www.blackrock.com/18/role/ExpenseExample", "http://www.blackrock.com/18/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/18/role/FeesAndExpenses", "http://www.blackrock.com/18/role/InvestmentRisks", "http://www.blackrock.com/18/role/InvestmentStrategy", "http://www.blackrock.com/18/role/N1aCover", "http://www.blackrock.com/18/role/N1aSupplement", "http://www.blackrock.com/18/role/OperatingExpensesData", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/18/role/PerformanceTableData", "http://www.blackrock.com/18/role/RiskReturn", "http://www.blackrock.com/18/role/ShareholderFeesData", "http://www.blackrock.com/19/role/BarChartData", "http://www.blackrock.com/19/role/ExpenseExample", "http://www.blackrock.com/19/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/19/role/FeesAndExpenses", "http://www.blackrock.com/19/role/InvestmentRisks", "http://www.blackrock.com/19/role/InvestmentStrategy", "http://www.blackrock.com/19/role/N1aCover", "http://www.blackrock.com/19/role/N1aSupplement", "http://www.blackrock.com/19/role/OperatingExpensesData", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/19/role/PerformanceTableData", "http://www.blackrock.com/19/role/RiskReturn", "http://www.blackrock.com/19/role/ShareholderFeesData", "http://www.blackrock.com/2/role/BarChartData", "http://www.blackrock.com/2/role/ExpenseExample", "http://www.blackrock.com/2/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/2/role/FeesAndExpenses", "http://www.blackrock.com/2/role/InvestmentRisks", "http://www.blackrock.com/2/role/InvestmentStrategy", "http://www.blackrock.com/2/role/N1aCover", "http://www.blackrock.com/2/role/N1aSupplement", "http://www.blackrock.com/2/role/OperatingExpensesData", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/2/role/PerformanceTableData", "http://www.blackrock.com/2/role/RiskReturn", "http://www.blackrock.com/2/role/ShareholderFeesData", "http://www.blackrock.com/20/role/BarChartData", "http://www.blackrock.com/20/role/ExpenseExample", "http://www.blackrock.com/20/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/20/role/FeesAndExpenses", "http://www.blackrock.com/20/role/InvestmentRisks", "http://www.blackrock.com/20/role/InvestmentStrategy", "http://www.blackrock.com/20/role/N1aCover", "http://www.blackrock.com/20/role/N1aSupplement", "http://www.blackrock.com/20/role/OperatingExpensesData", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/20/role/PerformanceTableData", "http://www.blackrock.com/20/role/RiskReturn", "http://www.blackrock.com/20/role/ShareholderFeesData", "http://www.blackrock.com/3/role/BarChartData", "http://www.blackrock.com/3/role/ExpenseExample", "http://www.blackrock.com/3/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/3/role/FeesAndExpenses", "http://www.blackrock.com/3/role/InvestmentRisks", "http://www.blackrock.com/3/role/InvestmentStrategy", "http://www.blackrock.com/3/role/N1aCover", "http://www.blackrock.com/3/role/N1aSupplement", "http://www.blackrock.com/3/role/OperatingExpensesData", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/3/role/PerformanceTableData", "http://www.blackrock.com/3/role/RiskReturn", "http://www.blackrock.com/3/role/ShareholderFeesData", "http://www.blackrock.com/4/role/BarChartData", "http://www.blackrock.com/4/role/ExpenseExample", "http://www.blackrock.com/4/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/4/role/FeesAndExpenses", "http://www.blackrock.com/4/role/InvestmentRisks", "http://www.blackrock.com/4/role/InvestmentStrategy", "http://www.blackrock.com/4/role/N1aCover", "http://www.blackrock.com/4/role/N1aSupplement", "http://www.blackrock.com/4/role/OperatingExpensesData", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/4/role/PerformanceTableData", "http://www.blackrock.com/4/role/RiskReturn", "http://www.blackrock.com/4/role/ShareholderFeesData", "http://www.blackrock.com/5/role/BarChartData", "http://www.blackrock.com/5/role/ExpenseExample", "http://www.blackrock.com/5/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/5/role/FeesAndExpenses", "http://www.blackrock.com/5/role/InvestmentRisks", "http://www.blackrock.com/5/role/InvestmentStrategy", "http://www.blackrock.com/5/role/N1aCover", "http://www.blackrock.com/5/role/N1aSupplement", "http://www.blackrock.com/5/role/OperatingExpensesData", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/5/role/PerformanceTableData", "http://www.blackrock.com/5/role/RiskReturn", "http://www.blackrock.com/5/role/ShareholderFeesData", "http://www.blackrock.com/6/role/BarChartData", "http://www.blackrock.com/6/role/ExpenseExample", "http://www.blackrock.com/6/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/6/role/FeesAndExpenses", "http://www.blackrock.com/6/role/InvestmentRisks", "http://www.blackrock.com/6/role/InvestmentStrategy", "http://www.blackrock.com/6/role/N1aCover", "http://www.blackrock.com/6/role/N1aSupplement", "http://www.blackrock.com/6/role/OperatingExpensesData", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/6/role/PerformanceTableData", "http://www.blackrock.com/6/role/RiskReturn", "http://www.blackrock.com/6/role/ShareholderFeesData", "http://www.blackrock.com/7/role/BarChartData", "http://www.blackrock.com/7/role/ExpenseExample", "http://www.blackrock.com/7/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/7/role/FeesAndExpenses", "http://www.blackrock.com/7/role/InvestmentRisks", "http://www.blackrock.com/7/role/InvestmentStrategy", "http://www.blackrock.com/7/role/N1aCover", "http://www.blackrock.com/7/role/N1aSupplement", "http://www.blackrock.com/7/role/OperatingExpensesData", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/7/role/PerformanceTableData", "http://www.blackrock.com/7/role/RiskReturn", "http://www.blackrock.com/7/role/ShareholderFeesData", "http://www.blackrock.com/8/role/BarChartData", "http://www.blackrock.com/8/role/ExpenseExample", "http://www.blackrock.com/8/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/8/role/FeesAndExpenses", "http://www.blackrock.com/8/role/InvestmentRisks", "http://www.blackrock.com/8/role/InvestmentStrategy", "http://www.blackrock.com/8/role/N1aCover", "http://www.blackrock.com/8/role/N1aSupplement", "http://www.blackrock.com/8/role/OperatingExpensesData", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/8/role/PerformanceTableData", "http://www.blackrock.com/8/role/RiskReturn", "http://www.blackrock.com/8/role/ShareholderFeesData", "http://www.blackrock.com/9/role/BarChartData", "http://www.blackrock.com/9/role/ExpenseExample", "http://www.blackrock.com/9/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/9/role/FeesAndExpenses", "http://www.blackrock.com/9/role/InvestmentRisks", "http://www.blackrock.com/9/role/InvestmentStrategy", "http://www.blackrock.com/9/role/N1aCover", "http://www.blackrock.com/9/role/N1aSupplement", "http://www.blackrock.com/9/role/OperatingExpensesData", "http://www.blackrock.com/9/role/PerformanceManagement", "http://www.blackrock.com/9/role/PerformanceTableData", "http://www.blackrock.com/9/role/RiskReturn", "http://www.blackrock.com/9/role/ShareholderFeesData", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/InvestmentRisks", "http://xbrl.sec.gov/rr/role/InvestmentStrategy", "http://xbrl.sec.gov/rr/role/N1aCover", "http://xbrl.sec.gov/rr/role/N1aSupplement", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/RiskReturn", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "All Coregistrants [Member]" } } }, "auth_ref": [ "r1" ] }, "oef_AllRisksMember": { "xbrltype": "domainItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "AllRisksMember", "presentation": [ "http://www.blackrock.com/1/role/InvestmentRisks", "http://www.blackrock.com/10/role/InvestmentRisks", "http://www.blackrock.com/11/role/InvestmentRisks", "http://www.blackrock.com/12/role/InvestmentRisks", "http://www.blackrock.com/13/role/InvestmentRisks", "http://www.blackrock.com/14/role/InvestmentRisks", "http://www.blackrock.com/15/role/InvestmentRisks", "http://www.blackrock.com/16/role/InvestmentRisks", "http://www.blackrock.com/17/role/InvestmentRisks", "http://www.blackrock.com/18/role/InvestmentRisks", "http://www.blackrock.com/19/role/InvestmentRisks", "http://www.blackrock.com/2/role/InvestmentRisks", "http://www.blackrock.com/20/role/InvestmentRisks", "http://www.blackrock.com/3/role/InvestmentRisks", "http://www.blackrock.com/4/role/InvestmentRisks", "http://www.blackrock.com/5/role/InvestmentRisks", "http://www.blackrock.com/6/role/InvestmentRisks", "http://www.blackrock.com/7/role/InvestmentRisks", "http://www.blackrock.com/8/role/InvestmentRisks", "http://www.blackrock.com/9/role/InvestmentRisks", "http://xbrl.sec.gov/rr/role/InvestmentRisks" ], "lang": { "en-us": { "role": { "label": "All Risks [Member]" } } }, "auth_ref": [ "r37" ] }, "bf3_AllocationRiskMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "AllocationRiskMember", "presentation": [ "http://www.blackrock.com/1/role/InvestmentRisks", "http://www.blackrock.com/10/role/InvestmentRisks", "http://www.blackrock.com/11/role/InvestmentRisks", "http://www.blackrock.com/12/role/InvestmentRisks", "http://www.blackrock.com/13/role/InvestmentRisks", "http://www.blackrock.com/14/role/InvestmentRisks", "http://www.blackrock.com/15/role/InvestmentRisks", "http://www.blackrock.com/16/role/InvestmentRisks", "http://www.blackrock.com/17/role/InvestmentRisks", "http://www.blackrock.com/18/role/InvestmentRisks", "http://www.blackrock.com/19/role/InvestmentRisks", "http://www.blackrock.com/2/role/InvestmentRisks", "http://www.blackrock.com/20/role/InvestmentRisks", "http://www.blackrock.com/3/role/InvestmentRisks", "http://www.blackrock.com/4/role/InvestmentRisks", "http://www.blackrock.com/5/role/InvestmentRisks", "http://www.blackrock.com/6/role/InvestmentRisks", "http://www.blackrock.com/7/role/InvestmentRisks", "http://www.blackrock.com/8/role/InvestmentRisks", "http://www.blackrock.com/9/role/InvestmentRisks" ], "lang": { "en-us": { "role": { "label": "Allocation Risk [Member]" } } }, "auth_ref": [] }, "dei_AmendmentDescription": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/dei/2025", "localname": "AmendmentDescription", "presentation": [ "http://www.blackrock.com/1/role/N1aCover", "http://www.blackrock.com/10/role/N1aCover", "http://www.blackrock.com/11/role/N1aCover", "http://www.blackrock.com/12/role/N1aCover", "http://www.blackrock.com/13/role/N1aCover", "http://www.blackrock.com/14/role/N1aCover", "http://www.blackrock.com/15/role/N1aCover", "http://www.blackrock.com/16/role/N1aCover", "http://www.blackrock.com/17/role/N1aCover", "http://www.blackrock.com/18/role/N1aCover", "http://www.blackrock.com/19/role/N1aCover", "http://www.blackrock.com/2/role/N1aCover", "http://www.blackrock.com/20/role/N1aCover", "http://www.blackrock.com/3/role/N1aCover", "http://www.blackrock.com/4/role/N1aCover", "http://www.blackrock.com/5/role/N1aCover", "http://www.blackrock.com/6/role/N1aCover", "http://www.blackrock.com/7/role/N1aCover", "http://www.blackrock.com/8/role/N1aCover", "http://www.blackrock.com/9/role/N1aCover", "http://xbrl.sec.gov/rr/role/N1aCover" ], "lang": { "en-us": { "role": { "label": "Amendment Description", "documentation": "Description of changes contained within amended document." } } }, "auth_ref": [] }, "dei_AmendmentFlag": { "xbrltype": "booleanItemType", "nsuri": "http://xbrl.sec.gov/dei/2025", "localname": "AmendmentFlag", "presentation": [ "http://www.blackrock.com/1/role/N1aCover", "http://www.blackrock.com/10/role/N1aCover", "http://www.blackrock.com/11/role/N1aCover", "http://www.blackrock.com/12/role/N1aCover", "http://www.blackrock.com/13/role/N1aCover", "http://www.blackrock.com/14/role/N1aCover", "http://www.blackrock.com/15/role/N1aCover", "http://www.blackrock.com/16/role/N1aCover", "http://www.blackrock.com/17/role/N1aCover", "http://www.blackrock.com/18/role/N1aCover", "http://www.blackrock.com/19/role/N1aCover", "http://www.blackrock.com/2/role/N1aCover", "http://www.blackrock.com/20/role/N1aCover", "http://www.blackrock.com/3/role/N1aCover", "http://www.blackrock.com/4/role/N1aCover", "http://www.blackrock.com/5/role/N1aCover", "http://www.blackrock.com/6/role/N1aCover", "http://www.blackrock.com/7/role/N1aCover", "http://www.blackrock.com/8/role/N1aCover", "http://www.blackrock.com/9/role/N1aCover", "http://xbrl.sec.gov/rr/role/N1aCover" ], "lang": { "en-us": { "role": { "label": "Amendment Flag", "documentation": "Boolean flag that is true when the XBRL content amends previously-filed or accepted submission." } } }, "auth_ref": [] }, "oef_AnnlRtrPct": { "xbrltype": "pureItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "AnnlRtrPct", "presentation": [ "http://www.blackrock.com/1/role/BarChartData", "http://www.blackrock.com/10/role/BarChartData", "http://www.blackrock.com/11/role/BarChartData", "http://www.blackrock.com/12/role/BarChartData", "http://www.blackrock.com/13/role/BarChartData", "http://www.blackrock.com/14/role/BarChartData", "http://www.blackrock.com/15/role/BarChartData", "http://www.blackrock.com/16/role/BarChartData", "http://www.blackrock.com/17/role/BarChartData", "http://www.blackrock.com/18/role/BarChartData", "http://www.blackrock.com/19/role/BarChartData", "http://www.blackrock.com/2/role/BarChartData", "http://www.blackrock.com/20/role/BarChartData", "http://www.blackrock.com/3/role/BarChartData", "http://www.blackrock.com/4/role/BarChartData", "http://www.blackrock.com/5/role/BarChartData", "http://www.blackrock.com/6/role/BarChartData", "http://www.blackrock.com/7/role/BarChartData", "http://www.blackrock.com/8/role/BarChartData", "http://www.blackrock.com/9/role/BarChartData", "http://xbrl.sec.gov/rr/role/BarChartData" ], "lang": { "en-us": { "role": { "label": "Annual Return [Percent]" } } }, "auth_ref": [ "r44" ] }, "oef_AnnualFundOperatingExpensesTableTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "AnnualFundOperatingExpensesTableTextBlock", "presentation": [ "http://www.blackrock.com/1/role/FeesAndExpenses", "http://www.blackrock.com/10/role/FeesAndExpenses", "http://www.blackrock.com/11/role/FeesAndExpenses", "http://www.blackrock.com/12/role/FeesAndExpenses", "http://www.blackrock.com/13/role/FeesAndExpenses", "http://www.blackrock.com/14/role/FeesAndExpenses", "http://www.blackrock.com/15/role/FeesAndExpenses", "http://www.blackrock.com/16/role/FeesAndExpenses", "http://www.blackrock.com/17/role/FeesAndExpenses", "http://www.blackrock.com/18/role/FeesAndExpenses", "http://www.blackrock.com/19/role/FeesAndExpenses", "http://www.blackrock.com/2/role/FeesAndExpenses", "http://www.blackrock.com/20/role/FeesAndExpenses", "http://www.blackrock.com/3/role/FeesAndExpenses", "http://www.blackrock.com/4/role/FeesAndExpenses", "http://www.blackrock.com/5/role/FeesAndExpenses", "http://www.blackrock.com/6/role/FeesAndExpenses", "http://www.blackrock.com/7/role/FeesAndExpenses", "http://www.blackrock.com/8/role/FeesAndExpenses", "http://www.blackrock.com/9/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/FeesAndExpenses" ], "lang": { "en-us": { "role": { "label": "Annual Fund Operating Expenses [Table]" } } }, "auth_ref": [ "r34" ] }, "oef_AnnualReturnCaption": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "AnnualReturnCaption", "presentation": [ "http://www.blackrock.com/1/role/BarChartData", "http://www.blackrock.com/10/role/BarChartData", "http://www.blackrock.com/11/role/BarChartData", "http://www.blackrock.com/12/role/BarChartData", "http://www.blackrock.com/13/role/BarChartData", "http://www.blackrock.com/14/role/BarChartData", "http://www.blackrock.com/15/role/BarChartData", "http://www.blackrock.com/16/role/BarChartData", "http://www.blackrock.com/17/role/BarChartData", "http://www.blackrock.com/18/role/BarChartData", "http://www.blackrock.com/19/role/BarChartData", "http://www.blackrock.com/2/role/BarChartData", "http://www.blackrock.com/20/role/BarChartData", "http://www.blackrock.com/3/role/BarChartData", "http://www.blackrock.com/4/role/BarChartData", "http://www.blackrock.com/5/role/BarChartData", "http://www.blackrock.com/6/role/BarChartData", "http://www.blackrock.com/7/role/BarChartData", "http://www.blackrock.com/8/role/BarChartData", "http://www.blackrock.com/9/role/BarChartData", "http://xbrl.sec.gov/rr/role/BarChartData" ], "lang": { "en-us": { "role": { "label": "Annual Return Caption [Text]" } } }, "auth_ref": [ "r46" ] }, "oef_AnnualReturnColumnName": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "AnnualReturnColumnName", "presentation": [ "http://www.blackrock.com/1/role/BarChartData", "http://www.blackrock.com/10/role/BarChartData", "http://www.blackrock.com/11/role/BarChartData", "http://www.blackrock.com/12/role/BarChartData", "http://www.blackrock.com/13/role/BarChartData", "http://www.blackrock.com/14/role/BarChartData", "http://www.blackrock.com/15/role/BarChartData", "http://www.blackrock.com/16/role/BarChartData", "http://www.blackrock.com/17/role/BarChartData", "http://www.blackrock.com/18/role/BarChartData", "http://www.blackrock.com/19/role/BarChartData", "http://www.blackrock.com/2/role/BarChartData", "http://www.blackrock.com/20/role/BarChartData", "http://www.blackrock.com/3/role/BarChartData", "http://www.blackrock.com/4/role/BarChartData", "http://www.blackrock.com/5/role/BarChartData", "http://www.blackrock.com/6/role/BarChartData", "http://www.blackrock.com/7/role/BarChartData", "http://www.blackrock.com/8/role/BarChartData", "http://www.blackrock.com/9/role/BarChartData", "http://xbrl.sec.gov/rr/role/BarChartData" ], "lang": { "en-us": { "role": { "label": "Annual Return, Column [Optional Text]" } } }, "auth_ref": [ "r45" ] }, "oef_AnnualReturnInceptionDate": { "xbrltype": "dateItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "AnnualReturnInceptionDate", "presentation": [ "http://www.blackrock.com/1/role/BarChartData", "http://www.blackrock.com/10/role/BarChartData", "http://www.blackrock.com/11/role/BarChartData", "http://www.blackrock.com/12/role/BarChartData", "http://www.blackrock.com/13/role/BarChartData", "http://www.blackrock.com/14/role/BarChartData", "http://www.blackrock.com/15/role/BarChartData", "http://www.blackrock.com/16/role/BarChartData", "http://www.blackrock.com/17/role/BarChartData", "http://www.blackrock.com/18/role/BarChartData", "http://www.blackrock.com/19/role/BarChartData", "http://www.blackrock.com/2/role/BarChartData", "http://www.blackrock.com/20/role/BarChartData", "http://www.blackrock.com/3/role/BarChartData", "http://www.blackrock.com/4/role/BarChartData", "http://www.blackrock.com/5/role/BarChartData", "http://www.blackrock.com/6/role/BarChartData", "http://www.blackrock.com/7/role/BarChartData", "http://www.blackrock.com/8/role/BarChartData", "http://www.blackrock.com/9/role/BarChartData", "http://xbrl.sec.gov/rr/role/BarChartData" ], "lang": { "en-us": { "role": { "label": "Annual Return, Inception Date" } } }, "auth_ref": [ "r44" ] }, "bf3_AssetClassRiskMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "AssetClassRiskMember", "presentation": [ "http://www.blackrock.com/1/role/InvestmentRisks", "http://www.blackrock.com/10/role/InvestmentRisks", "http://www.blackrock.com/11/role/InvestmentRisks", "http://www.blackrock.com/12/role/InvestmentRisks", "http://www.blackrock.com/13/role/InvestmentRisks", "http://www.blackrock.com/14/role/InvestmentRisks", "http://www.blackrock.com/15/role/InvestmentRisks", "http://www.blackrock.com/16/role/InvestmentRisks", "http://www.blackrock.com/17/role/InvestmentRisks", "http://www.blackrock.com/18/role/InvestmentRisks", "http://www.blackrock.com/19/role/InvestmentRisks", "http://www.blackrock.com/2/role/InvestmentRisks", "http://www.blackrock.com/20/role/InvestmentRisks", "http://www.blackrock.com/3/role/InvestmentRisks", "http://www.blackrock.com/4/role/InvestmentRisks", "http://www.blackrock.com/5/role/InvestmentRisks", "http://www.blackrock.com/6/role/InvestmentRisks", "http://www.blackrock.com/7/role/InvestmentRisks", "http://www.blackrock.com/8/role/InvestmentRisks", "http://www.blackrock.com/9/role/InvestmentRisks" ], "lang": { "en-us": { "role": { "label": "Asset Class Risk [Member]" } } }, "auth_ref": [] }, "bf3_AuthorizedParticipantConcentrationRiskMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "AuthorizedParticipantConcentrationRiskMember", "presentation": [ "http://www.blackrock.com/1/role/InvestmentRisks", "http://www.blackrock.com/10/role/InvestmentRisks", "http://www.blackrock.com/11/role/InvestmentRisks", "http://www.blackrock.com/12/role/InvestmentRisks", "http://www.blackrock.com/13/role/InvestmentRisks", "http://www.blackrock.com/14/role/InvestmentRisks", "http://www.blackrock.com/15/role/InvestmentRisks", "http://www.blackrock.com/16/role/InvestmentRisks", "http://www.blackrock.com/17/role/InvestmentRisks", "http://www.blackrock.com/18/role/InvestmentRisks", "http://www.blackrock.com/19/role/InvestmentRisks", "http://www.blackrock.com/2/role/InvestmentRisks", "http://www.blackrock.com/20/role/InvestmentRisks", "http://www.blackrock.com/3/role/InvestmentRisks", "http://www.blackrock.com/4/role/InvestmentRisks", "http://www.blackrock.com/5/role/InvestmentRisks", "http://www.blackrock.com/6/role/InvestmentRisks", "http://www.blackrock.com/7/role/InvestmentRisks", "http://www.blackrock.com/8/role/InvestmentRisks", "http://www.blackrock.com/9/role/InvestmentRisks" ], "lang": { "en-us": { "role": { "label": "Authorized Participant Concentration Risk [Member]" } } }, "auth_ref": [] }, "oef_AverageAnnualReturnAbstract": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "AverageAnnualReturnAbstract", "lang": { "en-us": { "role": { "label": "Average Annual Return:" } } }, "auth_ref": [ "r48" ] }, "oef_AverageAnnualReturnCaption": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "AverageAnnualReturnCaption", "presentation": [ "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/9/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Average Annual Return, Caption [Optional Text]" } } }, "auth_ref": [ "r48" ] }, "oef_AverageAnnualReturnColumnName": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "AverageAnnualReturnColumnName", "presentation": [ "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/9/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Average Annual Return, Column Name [Optional Text]" } } }, "auth_ref": [ "r48" ] }, "oef_AverageAnnualReturnLabel": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "AverageAnnualReturnLabel", "presentation": [ "http://www.blackrock.com/1/role/PerformanceTableData", "http://www.blackrock.com/10/role/PerformanceTableData", "http://www.blackrock.com/11/role/PerformanceTableData", "http://www.blackrock.com/12/role/PerformanceTableData", "http://www.blackrock.com/13/role/PerformanceTableData", "http://www.blackrock.com/14/role/PerformanceTableData", "http://www.blackrock.com/15/role/PerformanceTableData", "http://www.blackrock.com/16/role/PerformanceTableData", "http://www.blackrock.com/17/role/PerformanceTableData", "http://www.blackrock.com/18/role/PerformanceTableData", "http://www.blackrock.com/19/role/PerformanceTableData", "http://www.blackrock.com/2/role/PerformanceTableData", "http://www.blackrock.com/20/role/PerformanceTableData", "http://www.blackrock.com/3/role/PerformanceTableData", "http://www.blackrock.com/4/role/PerformanceTableData", "http://www.blackrock.com/5/role/PerformanceTableData", "http://www.blackrock.com/6/role/PerformanceTableData", "http://www.blackrock.com/7/role/PerformanceTableData", "http://www.blackrock.com/8/role/PerformanceTableData", "http://www.blackrock.com/9/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "Average Annual Return, Label [Optional Text]" } } }, "auth_ref": [ "r48" ] }, "oef_AvgAnnlRtrPct": { "xbrltype": "percentItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "AvgAnnlRtrPct", "presentation": [ "http://www.blackrock.com/1/role/PerformanceTableData", "http://www.blackrock.com/10/role/PerformanceTableData", "http://www.blackrock.com/11/role/PerformanceTableData", "http://www.blackrock.com/12/role/PerformanceTableData", "http://www.blackrock.com/13/role/PerformanceTableData", "http://www.blackrock.com/14/role/PerformanceTableData", "http://www.blackrock.com/15/role/PerformanceTableData", "http://www.blackrock.com/16/role/PerformanceTableData", "http://www.blackrock.com/17/role/PerformanceTableData", "http://www.blackrock.com/18/role/PerformanceTableData", "http://www.blackrock.com/19/role/PerformanceTableData", "http://www.blackrock.com/2/role/PerformanceTableData", "http://www.blackrock.com/20/role/PerformanceTableData", "http://www.blackrock.com/3/role/PerformanceTableData", "http://www.blackrock.com/4/role/PerformanceTableData", "http://www.blackrock.com/5/role/PerformanceTableData", "http://www.blackrock.com/6/role/PerformanceTableData", "http://www.blackrock.com/7/role/PerformanceTableData", "http://www.blackrock.com/8/role/PerformanceTableData", "http://www.blackrock.com/9/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "Average Annual Return, Percent" } } }, "auth_ref": [ "r9" ] }, "oef_BarChartAndPerformanceTableHeading": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "BarChartAndPerformanceTableHeading", "presentation": [ "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/9/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Bar Chart and Performance Table [Heading]" } } }, "auth_ref": [ "r42" ] }, "oef_BarChartClosingTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "BarChartClosingTextBlock", "presentation": [ "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/9/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Bar Chart Closing [Text Block]" } } }, "auth_ref": [ "r44" ] }, "oef_BarChartDoesNotReflectSalesLoads": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "BarChartDoesNotReflectSalesLoads", "presentation": [ "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/9/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Bar Chart Does Not Reflect Sales Loads [Text]" } } }, "auth_ref": [ "r44" ] }, "oef_BarChartFootnotesTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "BarChartFootnotesTextBlock", "presentation": [ "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/9/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Bar Chart Footnotes [Text Block]" } } }, "auth_ref": [ "r49" ] }, "oef_BarChartHeading": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "BarChartHeading", "presentation": [ "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/9/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Bar Chart [Heading]" } } }, "auth_ref": [ "r44" ] }, "oef_BarChartHighestQuarterlyReturn": { "xbrltype": "pureItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "BarChartHighestQuarterlyReturn", "presentation": [ "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/9/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Highest Quarterly Return" } } }, "auth_ref": [ "r44" ] }, "oef_BarChartHighestQuarterlyReturnDate": { "xbrltype": "dateItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "BarChartHighestQuarterlyReturnDate", "presentation": [ "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/9/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Highest Quarterly Return, Date" } } }, "auth_ref": [ "r44" ] }, "oef_BarChartLowestQuarterlyReturn": { "xbrltype": "pureItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "BarChartLowestQuarterlyReturn", "presentation": [ "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/9/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Lowest Quarterly Return" } } }, "auth_ref": [ "r44" ] }, "oef_BarChartLowestQuarterlyReturnDate": { "xbrltype": "dateItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "BarChartLowestQuarterlyReturnDate", "presentation": [ "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/9/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Lowest Quarterly Return, Date" } } }, "auth_ref": [ "r44" ] }, "oef_BarChartNarrativeTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "BarChartNarrativeTextBlock", "presentation": [ "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/9/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Bar Chart Narrative [Text Block]" } } }, "auth_ref": [ "r44" ] }, "oef_BarChartReasonSelectedClassDifferentFromImmediatelyPrecedingPeriod": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "BarChartReasonSelectedClassDifferentFromImmediatelyPrecedingPeriod", "presentation": [ "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/9/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Bar Chart, Reason Selected Class Different from Immediately Preceding Period [Text]" } } }, "auth_ref": [ "r47" ] }, "oef_BarChartReturnsForClassNotOfferedInProspectus": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "BarChartReturnsForClassNotOfferedInProspectus", "presentation": [ "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/9/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Bar Chart, Returns for Class Not Offered in Prospectus [Text]" } } }, "auth_ref": [ "r46" ] }, "oef_BarChartTableAbstract": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "BarChartTableAbstract", "lang": { "en-us": { "role": { "label": "Bar Chart Table:" } } }, "auth_ref": [ "r44" ] }, "oef_BarChartTableTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "BarChartTableTextBlock", "presentation": [ "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/9/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Bar Chart [Table]" } } }, "auth_ref": [ "r44" ] }, "oef_BarChartYearToDateReturn": { "xbrltype": "pureItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "BarChartYearToDateReturn", "presentation": [ "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/9/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Bar Chart, Year to Date Return" } } }, "auth_ref": [ "r44" ] }, "oef_BarChartYearToDateReturnDate": { "xbrltype": "dateItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "BarChartYearToDateReturnDate", "presentation": [ "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/9/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Bar Chart, Year to Date Return, Date" } } }, "auth_ref": [ "r44" ] }, "bf3_C000220929Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000220929Member", "presentation": [ "http://www.blackrock.com/11/role/BarChartData", "http://www.blackrock.com/11/role/ExpenseExample", "http://www.blackrock.com/11/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/11/role/N1aSupplement", "http://www.blackrock.com/11/role/OperatingExpensesData", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/11/role/PerformanceTableData", "http://www.blackrock.com/11/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "verboseLabel": "Class K Shares", "label": "C000220929 [Member]" } } }, "auth_ref": [] }, "bf3_C000220930Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000220930Member", "presentation": [ "http://www.blackrock.com/1/role/BarChartData", "http://www.blackrock.com/1/role/ExpenseExample", "http://www.blackrock.com/1/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/1/role/N1aSupplement", "http://www.blackrock.com/1/role/OperatingExpensesData", "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/1/role/PerformanceTableData", "http://www.blackrock.com/1/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "verboseLabel": "Institutional", "label": "C000220930 [Member]" } } }, "auth_ref": [] }, "bf3_C000220931Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000220931Member", "presentation": [ "http://www.blackrock.com/1/role/BarChartData", "http://www.blackrock.com/1/role/ExpenseExample", "http://www.blackrock.com/1/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/1/role/N1aSupplement", "http://www.blackrock.com/1/role/OperatingExpensesData", "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/1/role/PerformanceTableData", "http://www.blackrock.com/1/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "verboseLabel": "Investor A", "label": "C000220931 [Member]" } } }, "auth_ref": [] }, "bf3_C000220932Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000220932Member", "presentation": [ "http://www.blackrock.com/9/role/BarChartData", "http://www.blackrock.com/9/role/ExpenseExample", "http://www.blackrock.com/9/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/9/role/N1aSupplement", "http://www.blackrock.com/9/role/OperatingExpensesData", "http://www.blackrock.com/9/role/PerformanceManagement", "http://www.blackrock.com/9/role/PerformanceTableData", "http://www.blackrock.com/9/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "verboseLabel": "Investor A", "label": "C000220932 [Member]" } } }, "auth_ref": [] }, "bf3_C000220933Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000220933Member", "presentation": [ "http://www.blackrock.com/19/role/BarChartData", "http://www.blackrock.com/19/role/ExpenseExample", "http://www.blackrock.com/19/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/19/role/N1aSupplement", "http://www.blackrock.com/19/role/OperatingExpensesData", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/19/role/PerformanceTableData", "http://www.blackrock.com/19/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "verboseLabel": "Class K", "label": "C000220933 [Member]" } } }, "auth_ref": [] }, "bf3_C000220934Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000220934Member", "presentation": [ "http://www.blackrock.com/9/role/BarChartData", "http://www.blackrock.com/9/role/ExpenseExample", "http://www.blackrock.com/9/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/9/role/N1aSupplement", "http://www.blackrock.com/9/role/OperatingExpensesData", "http://www.blackrock.com/9/role/PerformanceManagement", "http://www.blackrock.com/9/role/PerformanceTableData", "http://www.blackrock.com/9/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "verboseLabel": "Institutional", "label": "C000220934 [Member]" } } }, "auth_ref": [] }, "bf3_C000220938Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000220938Member", "presentation": [ "http://www.blackrock.com/2/role/BarChartData", "http://www.blackrock.com/2/role/ExpenseExample", "http://www.blackrock.com/2/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/2/role/N1aSupplement", "http://www.blackrock.com/2/role/OperatingExpensesData", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/2/role/PerformanceTableData", "http://www.blackrock.com/2/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "verboseLabel": "Institutional", "label": "C000220938 [Member]" } } }, "auth_ref": [] }, "bf3_C000220939Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000220939Member", "presentation": [ "http://www.blackrock.com/2/role/BarChartData", "http://www.blackrock.com/2/role/ExpenseExample", "http://www.blackrock.com/2/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/2/role/N1aSupplement", "http://www.blackrock.com/2/role/OperatingExpensesData", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/2/role/PerformanceTableData", "http://www.blackrock.com/2/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "verboseLabel": "Investor A", "label": "C000220939 [Member]" } } }, "auth_ref": [] }, "bf3_C000220940Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000220940Member", "presentation": [ "http://www.blackrock.com/12/role/BarChartData", "http://www.blackrock.com/12/role/ExpenseExample", "http://www.blackrock.com/12/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/12/role/N1aSupplement", "http://www.blackrock.com/12/role/OperatingExpensesData", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/12/role/PerformanceTableData", "http://www.blackrock.com/12/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "verboseLabel": "Class K Shares", "label": "C000220940 [Member]" } } }, "auth_ref": [] }, "bf3_C000220941Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000220941Member", "presentation": [ "http://www.blackrock.com/3/role/BarChartData", "http://www.blackrock.com/3/role/ExpenseExample", "http://www.blackrock.com/3/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/3/role/N1aSupplement", "http://www.blackrock.com/3/role/OperatingExpensesData", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/3/role/PerformanceTableData", "http://www.blackrock.com/3/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "verboseLabel": "Institutional", "label": "C000220941 [Member]" } } }, "auth_ref": [] }, "bf3_C000220942Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000220942Member", "presentation": [ "http://www.blackrock.com/3/role/BarChartData", "http://www.blackrock.com/3/role/ExpenseExample", "http://www.blackrock.com/3/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/3/role/N1aSupplement", "http://www.blackrock.com/3/role/OperatingExpensesData", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/3/role/PerformanceTableData", "http://www.blackrock.com/3/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "verboseLabel": "Investor A", "label": "C000220942 [Member]" } } }, "auth_ref": [] }, "bf3_C000220943Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000220943Member", "presentation": [ "http://www.blackrock.com/13/role/BarChartData", "http://www.blackrock.com/13/role/ExpenseExample", "http://www.blackrock.com/13/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/13/role/N1aSupplement", "http://www.blackrock.com/13/role/OperatingExpensesData", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/13/role/PerformanceTableData", "http://www.blackrock.com/13/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "verboseLabel": "Class K", "label": "C000220943 [Member]" } } }, "auth_ref": [] }, "bf3_C000220944Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000220944Member", "presentation": [ "http://www.blackrock.com/4/role/BarChartData", "http://www.blackrock.com/4/role/ExpenseExample", "http://www.blackrock.com/4/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/4/role/N1aSupplement", "http://www.blackrock.com/4/role/OperatingExpensesData", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/4/role/PerformanceTableData", "http://www.blackrock.com/4/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "verboseLabel": "Institutional", "label": "C000220944 [Member]" } } }, "auth_ref": [] }, "bf3_C000220945Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000220945Member", "presentation": [ "http://www.blackrock.com/14/role/BarChartData", "http://www.blackrock.com/14/role/ExpenseExample", "http://www.blackrock.com/14/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/14/role/N1aSupplement", "http://www.blackrock.com/14/role/OperatingExpensesData", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/14/role/PerformanceTableData", "http://www.blackrock.com/14/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "verboseLabel": "Class K", "label": "C000220945 [Member]" } } }, "auth_ref": [] }, "bf3_C000220946Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000220946Member", "presentation": [ "http://www.blackrock.com/4/role/BarChartData", "http://www.blackrock.com/4/role/ExpenseExample", "http://www.blackrock.com/4/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/4/role/N1aSupplement", "http://www.blackrock.com/4/role/OperatingExpensesData", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/4/role/PerformanceTableData", "http://www.blackrock.com/4/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "verboseLabel": "Investor A", "label": "C000220946 [Member]" } } }, "auth_ref": [] }, "bf3_C000220947Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000220947Member", "presentation": [ "http://www.blackrock.com/5/role/BarChartData", "http://www.blackrock.com/5/role/ExpenseExample", "http://www.blackrock.com/5/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/5/role/N1aSupplement", "http://www.blackrock.com/5/role/OperatingExpensesData", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/5/role/PerformanceTableData", "http://www.blackrock.com/5/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "verboseLabel": "Investor A", "label": "C000220947 [Member]" } } }, "auth_ref": [] }, "bf3_C000220948Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000220948Member", "presentation": [ "http://www.blackrock.com/5/role/BarChartData", "http://www.blackrock.com/5/role/ExpenseExample", "http://www.blackrock.com/5/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/5/role/N1aSupplement", "http://www.blackrock.com/5/role/OperatingExpensesData", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/5/role/PerformanceTableData", "http://www.blackrock.com/5/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "verboseLabel": "Institutional", "label": "C000220948 [Member]" } } }, "auth_ref": [] }, "bf3_C000220949Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000220949Member", "presentation": [ "http://www.blackrock.com/15/role/BarChartData", "http://www.blackrock.com/15/role/ExpenseExample", "http://www.blackrock.com/15/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/15/role/N1aSupplement", "http://www.blackrock.com/15/role/OperatingExpensesData", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/15/role/PerformanceTableData", "http://www.blackrock.com/15/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "verboseLabel": "Class K", "label": "C000220949 [Member]" } } }, "auth_ref": [] }, "bf3_C000220950Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000220950Member", "presentation": [ "http://www.blackrock.com/6/role/BarChartData", "http://www.blackrock.com/6/role/ExpenseExample", "http://www.blackrock.com/6/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/6/role/N1aSupplement", "http://www.blackrock.com/6/role/OperatingExpensesData", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/6/role/PerformanceTableData", "http://www.blackrock.com/6/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "verboseLabel": "Investor A", "label": "C000220950 [Member]" } } }, "auth_ref": [] }, "bf3_C000220951Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000220951Member", "presentation": [ "http://www.blackrock.com/6/role/BarChartData", "http://www.blackrock.com/6/role/ExpenseExample", "http://www.blackrock.com/6/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/6/role/N1aSupplement", "http://www.blackrock.com/6/role/OperatingExpensesData", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/6/role/PerformanceTableData", "http://www.blackrock.com/6/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "verboseLabel": "Institutional", "label": "C000220951 [Member]" } } }, "auth_ref": [] }, "bf3_C000220952Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000220952Member", "presentation": [ "http://www.blackrock.com/16/role/BarChartData", "http://www.blackrock.com/16/role/ExpenseExample", "http://www.blackrock.com/16/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/16/role/N1aSupplement", "http://www.blackrock.com/16/role/OperatingExpensesData", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/16/role/PerformanceTableData", "http://www.blackrock.com/16/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "verboseLabel": "Class K", "label": "C000220952 [Member]" } } }, "auth_ref": [] }, "bf3_C000220953Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000220953Member", "presentation": [ "http://www.blackrock.com/7/role/BarChartData", "http://www.blackrock.com/7/role/ExpenseExample", "http://www.blackrock.com/7/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/7/role/N1aSupplement", "http://www.blackrock.com/7/role/OperatingExpensesData", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/7/role/PerformanceTableData", "http://www.blackrock.com/7/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "verboseLabel": "Investor A", "label": "C000220953 [Member]" } } }, "auth_ref": [] }, "bf3_C000220954Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000220954Member", "presentation": [ "http://www.blackrock.com/17/role/BarChartData", "http://www.blackrock.com/17/role/ExpenseExample", "http://www.blackrock.com/17/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/17/role/N1aSupplement", "http://www.blackrock.com/17/role/OperatingExpensesData", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/17/role/PerformanceTableData", "http://www.blackrock.com/17/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "verboseLabel": "Class K", "label": "C000220954 [Member]" } } }, "auth_ref": [] }, "bf3_C000220955Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000220955Member", "presentation": [ "http://www.blackrock.com/7/role/BarChartData", "http://www.blackrock.com/7/role/ExpenseExample", "http://www.blackrock.com/7/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/7/role/N1aSupplement", "http://www.blackrock.com/7/role/OperatingExpensesData", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/7/role/PerformanceTableData", "http://www.blackrock.com/7/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "verboseLabel": "Institutional", "label": "C000220955 [Member]" } } }, "auth_ref": [] }, "bf3_C000220956Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000220956Member", "presentation": [ "http://www.blackrock.com/8/role/BarChartData", "http://www.blackrock.com/8/role/ExpenseExample", "http://www.blackrock.com/8/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/8/role/N1aSupplement", "http://www.blackrock.com/8/role/OperatingExpensesData", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/8/role/PerformanceTableData", "http://www.blackrock.com/8/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "verboseLabel": "Institutional", "label": "C000220956 [Member]" } } }, "auth_ref": [] }, "bf3_C000220957Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000220957Member", "presentation": [ "http://www.blackrock.com/18/role/BarChartData", "http://www.blackrock.com/18/role/ExpenseExample", "http://www.blackrock.com/18/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/18/role/N1aSupplement", "http://www.blackrock.com/18/role/OperatingExpensesData", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/18/role/PerformanceTableData", "http://www.blackrock.com/18/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "verboseLabel": "Class K", "label": "C000220957 [Member]" } } }, "auth_ref": [] }, "bf3_C000220958Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000220958Member", "presentation": [ "http://www.blackrock.com/8/role/BarChartData", "http://www.blackrock.com/8/role/ExpenseExample", "http://www.blackrock.com/8/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/8/role/N1aSupplement", "http://www.blackrock.com/8/role/OperatingExpensesData", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/8/role/PerformanceTableData", "http://www.blackrock.com/8/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "verboseLabel": "Investor A", "label": "C000220958 [Member]" } } }, "auth_ref": [] }, "bf3_C000251817Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000251817Member", "presentation": [ "http://www.blackrock.com/10/role/BarChartData", "http://www.blackrock.com/10/role/ExpenseExample", "http://www.blackrock.com/10/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/10/role/N1aSupplement", "http://www.blackrock.com/10/role/OperatingExpensesData", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/10/role/PerformanceTableData", "http://www.blackrock.com/10/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "verboseLabel": "Institutional", "label": "C000251817 [Member]" } } }, "auth_ref": [] }, "bf3_C000251818Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000251818Member", "presentation": [ "http://www.blackrock.com/10/role/BarChartData", "http://www.blackrock.com/10/role/ExpenseExample", "http://www.blackrock.com/10/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/10/role/N1aSupplement", "http://www.blackrock.com/10/role/OperatingExpensesData", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/10/role/PerformanceTableData", "http://www.blackrock.com/10/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "verboseLabel": "Investor A", "label": "C000251818 [Member]" } } }, "auth_ref": [] }, "bf3_C000251819Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000251819Member", "presentation": [ "http://www.blackrock.com/20/role/BarChartData", "http://www.blackrock.com/20/role/ExpenseExample", "http://www.blackrock.com/20/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/20/role/N1aSupplement", "http://www.blackrock.com/20/role/OperatingExpensesData", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/20/role/PerformanceTableData", "http://www.blackrock.com/20/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "verboseLabel": "Class K", "label": "C000251819 [Member]" } } }, "auth_ref": [] }, "oef_ClassAxis": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ClassAxis", "presentation": [ "http://www.blackrock.com/1/role/BarChartData", "http://www.blackrock.com/1/role/ExpenseExample", "http://www.blackrock.com/1/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/1/role/FeesAndExpenses", "http://www.blackrock.com/1/role/N1aSupplement", "http://www.blackrock.com/1/role/OperatingExpensesData", "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/1/role/PerformanceTableData", "http://www.blackrock.com/1/role/ShareholderFeesData", "http://www.blackrock.com/10/role/BarChartData", "http://www.blackrock.com/10/role/ExpenseExample", "http://www.blackrock.com/10/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/10/role/FeesAndExpenses", "http://www.blackrock.com/10/role/N1aSupplement", "http://www.blackrock.com/10/role/OperatingExpensesData", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/10/role/PerformanceTableData", "http://www.blackrock.com/10/role/ShareholderFeesData", "http://www.blackrock.com/11/role/BarChartData", "http://www.blackrock.com/11/role/ExpenseExample", "http://www.blackrock.com/11/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/11/role/FeesAndExpenses", "http://www.blackrock.com/11/role/N1aSupplement", "http://www.blackrock.com/11/role/OperatingExpensesData", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/11/role/PerformanceTableData", "http://www.blackrock.com/11/role/ShareholderFeesData", "http://www.blackrock.com/12/role/BarChartData", "http://www.blackrock.com/12/role/ExpenseExample", "http://www.blackrock.com/12/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/12/role/FeesAndExpenses", "http://www.blackrock.com/12/role/N1aSupplement", "http://www.blackrock.com/12/role/OperatingExpensesData", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/12/role/PerformanceTableData", "http://www.blackrock.com/12/role/ShareholderFeesData", "http://www.blackrock.com/13/role/BarChartData", "http://www.blackrock.com/13/role/ExpenseExample", "http://www.blackrock.com/13/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/13/role/FeesAndExpenses", "http://www.blackrock.com/13/role/N1aSupplement", "http://www.blackrock.com/13/role/OperatingExpensesData", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/13/role/PerformanceTableData", "http://www.blackrock.com/13/role/ShareholderFeesData", "http://www.blackrock.com/14/role/BarChartData", "http://www.blackrock.com/14/role/ExpenseExample", "http://www.blackrock.com/14/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/14/role/FeesAndExpenses", "http://www.blackrock.com/14/role/N1aSupplement", "http://www.blackrock.com/14/role/OperatingExpensesData", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/14/role/PerformanceTableData", "http://www.blackrock.com/14/role/ShareholderFeesData", "http://www.blackrock.com/15/role/BarChartData", "http://www.blackrock.com/15/role/ExpenseExample", "http://www.blackrock.com/15/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/15/role/FeesAndExpenses", "http://www.blackrock.com/15/role/N1aSupplement", "http://www.blackrock.com/15/role/OperatingExpensesData", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/15/role/PerformanceTableData", "http://www.blackrock.com/15/role/ShareholderFeesData", "http://www.blackrock.com/16/role/BarChartData", "http://www.blackrock.com/16/role/ExpenseExample", "http://www.blackrock.com/16/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/16/role/FeesAndExpenses", "http://www.blackrock.com/16/role/N1aSupplement", "http://www.blackrock.com/16/role/OperatingExpensesData", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/16/role/PerformanceTableData", "http://www.blackrock.com/16/role/ShareholderFeesData", "http://www.blackrock.com/17/role/BarChartData", "http://www.blackrock.com/17/role/ExpenseExample", "http://www.blackrock.com/17/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/17/role/FeesAndExpenses", "http://www.blackrock.com/17/role/N1aSupplement", "http://www.blackrock.com/17/role/OperatingExpensesData", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/17/role/PerformanceTableData", "http://www.blackrock.com/17/role/ShareholderFeesData", "http://www.blackrock.com/18/role/BarChartData", "http://www.blackrock.com/18/role/ExpenseExample", "http://www.blackrock.com/18/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/18/role/FeesAndExpenses", "http://www.blackrock.com/18/role/N1aSupplement", "http://www.blackrock.com/18/role/OperatingExpensesData", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/18/role/PerformanceTableData", "http://www.blackrock.com/18/role/ShareholderFeesData", "http://www.blackrock.com/19/role/BarChartData", "http://www.blackrock.com/19/role/ExpenseExample", "http://www.blackrock.com/19/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/19/role/FeesAndExpenses", "http://www.blackrock.com/19/role/N1aSupplement", "http://www.blackrock.com/19/role/OperatingExpensesData", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/19/role/PerformanceTableData", "http://www.blackrock.com/19/role/ShareholderFeesData", "http://www.blackrock.com/2/role/BarChartData", "http://www.blackrock.com/2/role/ExpenseExample", "http://www.blackrock.com/2/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/2/role/FeesAndExpenses", "http://www.blackrock.com/2/role/N1aSupplement", "http://www.blackrock.com/2/role/OperatingExpensesData", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/2/role/PerformanceTableData", "http://www.blackrock.com/2/role/ShareholderFeesData", "http://www.blackrock.com/20/role/BarChartData", "http://www.blackrock.com/20/role/ExpenseExample", "http://www.blackrock.com/20/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/20/role/FeesAndExpenses", "http://www.blackrock.com/20/role/N1aSupplement", "http://www.blackrock.com/20/role/OperatingExpensesData", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/20/role/PerformanceTableData", "http://www.blackrock.com/20/role/ShareholderFeesData", "http://www.blackrock.com/3/role/BarChartData", "http://www.blackrock.com/3/role/ExpenseExample", "http://www.blackrock.com/3/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/3/role/FeesAndExpenses", "http://www.blackrock.com/3/role/N1aSupplement", "http://www.blackrock.com/3/role/OperatingExpensesData", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/3/role/PerformanceTableData", "http://www.blackrock.com/3/role/ShareholderFeesData", "http://www.blackrock.com/4/role/BarChartData", "http://www.blackrock.com/4/role/ExpenseExample", "http://www.blackrock.com/4/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/4/role/FeesAndExpenses", "http://www.blackrock.com/4/role/N1aSupplement", "http://www.blackrock.com/4/role/OperatingExpensesData", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/4/role/PerformanceTableData", "http://www.blackrock.com/4/role/ShareholderFeesData", "http://www.blackrock.com/5/role/BarChartData", "http://www.blackrock.com/5/role/ExpenseExample", "http://www.blackrock.com/5/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/5/role/FeesAndExpenses", "http://www.blackrock.com/5/role/N1aSupplement", "http://www.blackrock.com/5/role/OperatingExpensesData", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/5/role/PerformanceTableData", "http://www.blackrock.com/5/role/ShareholderFeesData", "http://www.blackrock.com/6/role/BarChartData", "http://www.blackrock.com/6/role/ExpenseExample", "http://www.blackrock.com/6/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/6/role/FeesAndExpenses", "http://www.blackrock.com/6/role/N1aSupplement", "http://www.blackrock.com/6/role/OperatingExpensesData", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/6/role/PerformanceTableData", "http://www.blackrock.com/6/role/ShareholderFeesData", "http://www.blackrock.com/7/role/BarChartData", "http://www.blackrock.com/7/role/ExpenseExample", "http://www.blackrock.com/7/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/7/role/FeesAndExpenses", "http://www.blackrock.com/7/role/N1aSupplement", "http://www.blackrock.com/7/role/OperatingExpensesData", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/7/role/PerformanceTableData", "http://www.blackrock.com/7/role/ShareholderFeesData", "http://www.blackrock.com/8/role/BarChartData", "http://www.blackrock.com/8/role/ExpenseExample", "http://www.blackrock.com/8/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/8/role/FeesAndExpenses", "http://www.blackrock.com/8/role/N1aSupplement", "http://www.blackrock.com/8/role/OperatingExpensesData", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/8/role/PerformanceTableData", "http://www.blackrock.com/8/role/ShareholderFeesData", "http://www.blackrock.com/9/role/BarChartData", "http://www.blackrock.com/9/role/ExpenseExample", "http://www.blackrock.com/9/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/9/role/FeesAndExpenses", "http://www.blackrock.com/9/role/N1aSupplement", "http://www.blackrock.com/9/role/OperatingExpensesData", "http://www.blackrock.com/9/role/PerformanceManagement", "http://www.blackrock.com/9/role/PerformanceTableData", "http://www.blackrock.com/9/role/ShareholderFeesData", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/N1aSupplement", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "Class [Axis]" } } }, "auth_ref": [ "r4" ] }, "bf3_ClassKMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "ClassKMember", "presentation": [ "http://www.blackrock.com/11/role/BarChartData", "http://www.blackrock.com/11/role/ExpenseExample", "http://www.blackrock.com/11/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/11/role/FeesAndExpenses", "http://www.blackrock.com/11/role/InvestmentRisks", "http://www.blackrock.com/11/role/InvestmentStrategy", "http://www.blackrock.com/11/role/N1aCover", "http://www.blackrock.com/11/role/N1aSupplement", "http://www.blackrock.com/11/role/OperatingExpensesData", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/11/role/PerformanceTableData", "http://www.blackrock.com/11/role/RiskReturn", "http://www.blackrock.com/11/role/ShareholderFeesData", "http://www.blackrock.com/12/role/BarChartData", "http://www.blackrock.com/12/role/ExpenseExample", "http://www.blackrock.com/12/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/12/role/FeesAndExpenses", "http://www.blackrock.com/12/role/InvestmentRisks", "http://www.blackrock.com/12/role/InvestmentStrategy", "http://www.blackrock.com/12/role/N1aCover", "http://www.blackrock.com/12/role/N1aSupplement", "http://www.blackrock.com/12/role/OperatingExpensesData", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/12/role/PerformanceTableData", "http://www.blackrock.com/12/role/RiskReturn", "http://www.blackrock.com/12/role/ShareholderFeesData", "http://www.blackrock.com/13/role/BarChartData", "http://www.blackrock.com/13/role/ExpenseExample", "http://www.blackrock.com/13/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/13/role/FeesAndExpenses", "http://www.blackrock.com/13/role/InvestmentRisks", "http://www.blackrock.com/13/role/InvestmentStrategy", "http://www.blackrock.com/13/role/N1aCover", "http://www.blackrock.com/13/role/N1aSupplement", "http://www.blackrock.com/13/role/OperatingExpensesData", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/13/role/PerformanceTableData", "http://www.blackrock.com/13/role/RiskReturn", "http://www.blackrock.com/13/role/ShareholderFeesData", "http://www.blackrock.com/14/role/BarChartData", "http://www.blackrock.com/14/role/ExpenseExample", "http://www.blackrock.com/14/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/14/role/FeesAndExpenses", "http://www.blackrock.com/14/role/InvestmentRisks", "http://www.blackrock.com/14/role/InvestmentStrategy", "http://www.blackrock.com/14/role/N1aCover", "http://www.blackrock.com/14/role/N1aSupplement", "http://www.blackrock.com/14/role/OperatingExpensesData", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/14/role/PerformanceTableData", "http://www.blackrock.com/14/role/RiskReturn", "http://www.blackrock.com/14/role/ShareholderFeesData", "http://www.blackrock.com/15/role/BarChartData", "http://www.blackrock.com/15/role/ExpenseExample", "http://www.blackrock.com/15/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/15/role/FeesAndExpenses", "http://www.blackrock.com/15/role/InvestmentRisks", "http://www.blackrock.com/15/role/InvestmentStrategy", "http://www.blackrock.com/15/role/N1aCover", "http://www.blackrock.com/15/role/N1aSupplement", "http://www.blackrock.com/15/role/OperatingExpensesData", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/15/role/PerformanceTableData", "http://www.blackrock.com/15/role/RiskReturn", "http://www.blackrock.com/15/role/ShareholderFeesData", "http://www.blackrock.com/16/role/BarChartData", "http://www.blackrock.com/16/role/ExpenseExample", "http://www.blackrock.com/16/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/16/role/FeesAndExpenses", "http://www.blackrock.com/16/role/InvestmentRisks", "http://www.blackrock.com/16/role/InvestmentStrategy", "http://www.blackrock.com/16/role/N1aCover", "http://www.blackrock.com/16/role/N1aSupplement", "http://www.blackrock.com/16/role/OperatingExpensesData", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/16/role/PerformanceTableData", "http://www.blackrock.com/16/role/RiskReturn", "http://www.blackrock.com/16/role/ShareholderFeesData", "http://www.blackrock.com/17/role/BarChartData", "http://www.blackrock.com/17/role/ExpenseExample", "http://www.blackrock.com/17/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/17/role/FeesAndExpenses", "http://www.blackrock.com/17/role/InvestmentRisks", "http://www.blackrock.com/17/role/InvestmentStrategy", "http://www.blackrock.com/17/role/N1aCover", "http://www.blackrock.com/17/role/N1aSupplement", "http://www.blackrock.com/17/role/OperatingExpensesData", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/17/role/PerformanceTableData", "http://www.blackrock.com/17/role/RiskReturn", "http://www.blackrock.com/17/role/ShareholderFeesData", "http://www.blackrock.com/18/role/BarChartData", "http://www.blackrock.com/18/role/ExpenseExample", "http://www.blackrock.com/18/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/18/role/FeesAndExpenses", "http://www.blackrock.com/18/role/InvestmentRisks", "http://www.blackrock.com/18/role/InvestmentStrategy", "http://www.blackrock.com/18/role/N1aCover", "http://www.blackrock.com/18/role/N1aSupplement", "http://www.blackrock.com/18/role/OperatingExpensesData", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/18/role/PerformanceTableData", "http://www.blackrock.com/18/role/RiskReturn", "http://www.blackrock.com/18/role/ShareholderFeesData", "http://www.blackrock.com/19/role/BarChartData", "http://www.blackrock.com/19/role/ExpenseExample", "http://www.blackrock.com/19/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/19/role/FeesAndExpenses", "http://www.blackrock.com/19/role/InvestmentRisks", "http://www.blackrock.com/19/role/InvestmentStrategy", "http://www.blackrock.com/19/role/N1aCover", "http://www.blackrock.com/19/role/N1aSupplement", "http://www.blackrock.com/19/role/OperatingExpensesData", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/19/role/PerformanceTableData", "http://www.blackrock.com/19/role/RiskReturn", "http://www.blackrock.com/19/role/ShareholderFeesData", "http://www.blackrock.com/20/role/BarChartData", "http://www.blackrock.com/20/role/ExpenseExample", "http://www.blackrock.com/20/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/20/role/FeesAndExpenses", "http://www.blackrock.com/20/role/InvestmentRisks", "http://www.blackrock.com/20/role/InvestmentStrategy", "http://www.blackrock.com/20/role/N1aCover", "http://www.blackrock.com/20/role/N1aSupplement", "http://www.blackrock.com/20/role/OperatingExpensesData", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/20/role/PerformanceTableData", "http://www.blackrock.com/20/role/RiskReturn", "http://www.blackrock.com/20/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "verboseLabel": "Class K", "label": "Class K [Member]" } } }, "auth_ref": [] }, "bf3_CommoditiesRelatedInvestmentsRiskMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "CommoditiesRelatedInvestmentsRiskMember", "presentation": [ "http://www.blackrock.com/1/role/InvestmentRisks", "http://www.blackrock.com/10/role/InvestmentRisks", "http://www.blackrock.com/11/role/InvestmentRisks", "http://www.blackrock.com/12/role/InvestmentRisks", "http://www.blackrock.com/13/role/InvestmentRisks", "http://www.blackrock.com/14/role/InvestmentRisks", "http://www.blackrock.com/15/role/InvestmentRisks", "http://www.blackrock.com/16/role/InvestmentRisks", "http://www.blackrock.com/17/role/InvestmentRisks", "http://www.blackrock.com/18/role/InvestmentRisks", "http://www.blackrock.com/19/role/InvestmentRisks", "http://www.blackrock.com/2/role/InvestmentRisks", "http://www.blackrock.com/20/role/InvestmentRisks", "http://www.blackrock.com/3/role/InvestmentRisks", "http://www.blackrock.com/4/role/InvestmentRisks", "http://www.blackrock.com/5/role/InvestmentRisks", "http://www.blackrock.com/6/role/InvestmentRisks", "http://www.blackrock.com/7/role/InvestmentRisks", "http://www.blackrock.com/8/role/InvestmentRisks", "http://www.blackrock.com/9/role/InvestmentRisks" ], "lang": { "en-us": { "role": { "label": "Commodities Related Investments Risk [Member]" } } }, "auth_ref": [] }, "oef_Component1OtherExpensesOverAssets": { "xbrltype": "nonNegativePure4ItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "Component1OtherExpensesOverAssets", "calculation": { "http://xbrl.sec.gov/rr/role/OperatingExpensesData": { "parentTag": "oef_OtherExpensesOverAssets", "weight": 1.0, "order": 1.0 } }, "presentation": [ "http://www.blackrock.com/1/role/OperatingExpensesData", "http://www.blackrock.com/10/role/OperatingExpensesData", "http://www.blackrock.com/11/role/OperatingExpensesData", "http://www.blackrock.com/12/role/OperatingExpensesData", "http://www.blackrock.com/13/role/OperatingExpensesData", "http://www.blackrock.com/14/role/OperatingExpensesData", "http://www.blackrock.com/15/role/OperatingExpensesData", "http://www.blackrock.com/16/role/OperatingExpensesData", "http://www.blackrock.com/17/role/OperatingExpensesData", "http://www.blackrock.com/18/role/OperatingExpensesData", "http://www.blackrock.com/19/role/OperatingExpensesData", "http://www.blackrock.com/2/role/OperatingExpensesData", "http://www.blackrock.com/20/role/OperatingExpensesData", "http://www.blackrock.com/3/role/OperatingExpensesData", "http://www.blackrock.com/4/role/OperatingExpensesData", "http://www.blackrock.com/5/role/OperatingExpensesData", "http://www.blackrock.com/6/role/OperatingExpensesData", "http://www.blackrock.com/7/role/OperatingExpensesData", "http://www.blackrock.com/8/role/OperatingExpensesData", "http://www.blackrock.com/9/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/OperatingExpensesData" ], "lang": { "en-us": { "role": { "label": "Component1 Other Expenses" } } }, "auth_ref": [ "r22" ] }, "oef_Component2OtherExpensesOverAssets": { "xbrltype": "nonNegativePure4ItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "Component2OtherExpensesOverAssets", "calculation": { "http://xbrl.sec.gov/rr/role/OperatingExpensesData": { "parentTag": "oef_OtherExpensesOverAssets", "weight": 1.0, "order": 2.0 } }, "presentation": [ "http://www.blackrock.com/1/role/OperatingExpensesData", "http://www.blackrock.com/10/role/OperatingExpensesData", "http://www.blackrock.com/11/role/OperatingExpensesData", "http://www.blackrock.com/12/role/OperatingExpensesData", "http://www.blackrock.com/13/role/OperatingExpensesData", "http://www.blackrock.com/14/role/OperatingExpensesData", "http://www.blackrock.com/15/role/OperatingExpensesData", "http://www.blackrock.com/16/role/OperatingExpensesData", "http://www.blackrock.com/17/role/OperatingExpensesData", "http://www.blackrock.com/18/role/OperatingExpensesData", "http://www.blackrock.com/19/role/OperatingExpensesData", "http://www.blackrock.com/2/role/OperatingExpensesData", "http://www.blackrock.com/20/role/OperatingExpensesData", "http://www.blackrock.com/3/role/OperatingExpensesData", "http://www.blackrock.com/4/role/OperatingExpensesData", "http://www.blackrock.com/5/role/OperatingExpensesData", "http://www.blackrock.com/6/role/OperatingExpensesData", "http://www.blackrock.com/7/role/OperatingExpensesData", "http://www.blackrock.com/8/role/OperatingExpensesData", "http://www.blackrock.com/9/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/OperatingExpensesData" ], "lang": { "en-us": { "role": { "label": "Component2 Other Expenses" } } }, "auth_ref": [ "r22" ] }, "oef_Component3OtherExpensesOverAssets": { "xbrltype": "nonNegativePure4ItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "Component3OtherExpensesOverAssets", "calculation": { "http://xbrl.sec.gov/rr/role/OperatingExpensesData": { "parentTag": "oef_OtherExpensesOverAssets", "weight": 1.0, "order": 3.0 } }, "presentation": [ "http://www.blackrock.com/1/role/OperatingExpensesData", "http://www.blackrock.com/10/role/OperatingExpensesData", "http://www.blackrock.com/11/role/OperatingExpensesData", "http://www.blackrock.com/12/role/OperatingExpensesData", "http://www.blackrock.com/13/role/OperatingExpensesData", "http://www.blackrock.com/14/role/OperatingExpensesData", "http://www.blackrock.com/15/role/OperatingExpensesData", "http://www.blackrock.com/16/role/OperatingExpensesData", "http://www.blackrock.com/17/role/OperatingExpensesData", "http://www.blackrock.com/18/role/OperatingExpensesData", "http://www.blackrock.com/19/role/OperatingExpensesData", "http://www.blackrock.com/2/role/OperatingExpensesData", "http://www.blackrock.com/20/role/OperatingExpensesData", "http://www.blackrock.com/3/role/OperatingExpensesData", "http://www.blackrock.com/4/role/OperatingExpensesData", "http://www.blackrock.com/5/role/OperatingExpensesData", "http://www.blackrock.com/6/role/OperatingExpensesData", "http://www.blackrock.com/7/role/OperatingExpensesData", "http://www.blackrock.com/8/role/OperatingExpensesData", "http://www.blackrock.com/9/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/OperatingExpensesData" ], "lang": { "en-us": { "role": { "label": "Component3 Other Expenses" } } }, "auth_ref": [ "r22" ] }, "bf3_ConcentrationRiskMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "ConcentrationRiskMember", "presentation": [ "http://www.blackrock.com/1/role/InvestmentRisks", "http://www.blackrock.com/10/role/InvestmentRisks", "http://www.blackrock.com/11/role/InvestmentRisks", "http://www.blackrock.com/12/role/InvestmentRisks", "http://www.blackrock.com/13/role/InvestmentRisks", "http://www.blackrock.com/14/role/InvestmentRisks", "http://www.blackrock.com/15/role/InvestmentRisks", "http://www.blackrock.com/16/role/InvestmentRisks", "http://www.blackrock.com/17/role/InvestmentRisks", "http://www.blackrock.com/18/role/InvestmentRisks", "http://www.blackrock.com/19/role/InvestmentRisks", "http://www.blackrock.com/2/role/InvestmentRisks", "http://www.blackrock.com/20/role/InvestmentRisks", "http://www.blackrock.com/3/role/InvestmentRisks", "http://www.blackrock.com/4/role/InvestmentRisks", "http://www.blackrock.com/5/role/InvestmentRisks", "http://www.blackrock.com/6/role/InvestmentRisks", "http://www.blackrock.com/7/role/InvestmentRisks", "http://www.blackrock.com/8/role/InvestmentRisks", "http://www.blackrock.com/9/role/InvestmentRisks" ], "lang": { "en-us": { "role": { "label": "Concentration Risk [Member]" } } }, "auth_ref": [] }, "oef_CoregistrantAxis": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "CoregistrantAxis", "presentation": [ "http://www.blackrock.com/1/role/BarChartData", "http://www.blackrock.com/1/role/ExpenseExample", "http://www.blackrock.com/1/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/1/role/FeesAndExpenses", "http://www.blackrock.com/1/role/InvestmentRisks", "http://www.blackrock.com/1/role/InvestmentStrategy", "http://www.blackrock.com/1/role/N1aCover", "http://www.blackrock.com/1/role/N1aSupplement", "http://www.blackrock.com/1/role/OperatingExpensesData", "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/1/role/PerformanceTableData", "http://www.blackrock.com/1/role/RiskReturn", "http://www.blackrock.com/1/role/ShareholderFeesData", "http://www.blackrock.com/10/role/BarChartData", "http://www.blackrock.com/10/role/ExpenseExample", "http://www.blackrock.com/10/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/10/role/FeesAndExpenses", "http://www.blackrock.com/10/role/InvestmentRisks", "http://www.blackrock.com/10/role/InvestmentStrategy", "http://www.blackrock.com/10/role/N1aCover", "http://www.blackrock.com/10/role/N1aSupplement", "http://www.blackrock.com/10/role/OperatingExpensesData", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/10/role/PerformanceTableData", "http://www.blackrock.com/10/role/RiskReturn", "http://www.blackrock.com/10/role/ShareholderFeesData", "http://www.blackrock.com/11/role/BarChartData", "http://www.blackrock.com/11/role/ExpenseExample", "http://www.blackrock.com/11/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/11/role/FeesAndExpenses", "http://www.blackrock.com/11/role/InvestmentRisks", "http://www.blackrock.com/11/role/InvestmentStrategy", "http://www.blackrock.com/11/role/N1aCover", "http://www.blackrock.com/11/role/N1aSupplement", "http://www.blackrock.com/11/role/OperatingExpensesData", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/11/role/PerformanceTableData", "http://www.blackrock.com/11/role/RiskReturn", "http://www.blackrock.com/11/role/ShareholderFeesData", "http://www.blackrock.com/12/role/BarChartData", "http://www.blackrock.com/12/role/ExpenseExample", "http://www.blackrock.com/12/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/12/role/FeesAndExpenses", "http://www.blackrock.com/12/role/InvestmentRisks", "http://www.blackrock.com/12/role/InvestmentStrategy", "http://www.blackrock.com/12/role/N1aCover", "http://www.blackrock.com/12/role/N1aSupplement", "http://www.blackrock.com/12/role/OperatingExpensesData", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/12/role/PerformanceTableData", "http://www.blackrock.com/12/role/RiskReturn", "http://www.blackrock.com/12/role/ShareholderFeesData", "http://www.blackrock.com/13/role/BarChartData", "http://www.blackrock.com/13/role/ExpenseExample", "http://www.blackrock.com/13/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/13/role/FeesAndExpenses", "http://www.blackrock.com/13/role/InvestmentRisks", "http://www.blackrock.com/13/role/InvestmentStrategy", "http://www.blackrock.com/13/role/N1aCover", "http://www.blackrock.com/13/role/N1aSupplement", "http://www.blackrock.com/13/role/OperatingExpensesData", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/13/role/PerformanceTableData", "http://www.blackrock.com/13/role/RiskReturn", "http://www.blackrock.com/13/role/ShareholderFeesData", "http://www.blackrock.com/14/role/BarChartData", "http://www.blackrock.com/14/role/ExpenseExample", "http://www.blackrock.com/14/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/14/role/FeesAndExpenses", "http://www.blackrock.com/14/role/InvestmentRisks", "http://www.blackrock.com/14/role/InvestmentStrategy", "http://www.blackrock.com/14/role/N1aCover", "http://www.blackrock.com/14/role/N1aSupplement", "http://www.blackrock.com/14/role/OperatingExpensesData", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/14/role/PerformanceTableData", "http://www.blackrock.com/14/role/RiskReturn", "http://www.blackrock.com/14/role/ShareholderFeesData", "http://www.blackrock.com/15/role/BarChartData", "http://www.blackrock.com/15/role/ExpenseExample", "http://www.blackrock.com/15/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/15/role/FeesAndExpenses", "http://www.blackrock.com/15/role/InvestmentRisks", "http://www.blackrock.com/15/role/InvestmentStrategy", "http://www.blackrock.com/15/role/N1aCover", "http://www.blackrock.com/15/role/N1aSupplement", "http://www.blackrock.com/15/role/OperatingExpensesData", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/15/role/PerformanceTableData", "http://www.blackrock.com/15/role/RiskReturn", "http://www.blackrock.com/15/role/ShareholderFeesData", "http://www.blackrock.com/16/role/BarChartData", "http://www.blackrock.com/16/role/ExpenseExample", "http://www.blackrock.com/16/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/16/role/FeesAndExpenses", "http://www.blackrock.com/16/role/InvestmentRisks", "http://www.blackrock.com/16/role/InvestmentStrategy", "http://www.blackrock.com/16/role/N1aCover", "http://www.blackrock.com/16/role/N1aSupplement", "http://www.blackrock.com/16/role/OperatingExpensesData", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/16/role/PerformanceTableData", "http://www.blackrock.com/16/role/RiskReturn", "http://www.blackrock.com/16/role/ShareholderFeesData", "http://www.blackrock.com/17/role/BarChartData", "http://www.blackrock.com/17/role/ExpenseExample", "http://www.blackrock.com/17/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/17/role/FeesAndExpenses", "http://www.blackrock.com/17/role/InvestmentRisks", "http://www.blackrock.com/17/role/InvestmentStrategy", "http://www.blackrock.com/17/role/N1aCover", "http://www.blackrock.com/17/role/N1aSupplement", "http://www.blackrock.com/17/role/OperatingExpensesData", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/17/role/PerformanceTableData", "http://www.blackrock.com/17/role/RiskReturn", "http://www.blackrock.com/17/role/ShareholderFeesData", "http://www.blackrock.com/18/role/BarChartData", "http://www.blackrock.com/18/role/ExpenseExample", "http://www.blackrock.com/18/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/18/role/FeesAndExpenses", "http://www.blackrock.com/18/role/InvestmentRisks", "http://www.blackrock.com/18/role/InvestmentStrategy", "http://www.blackrock.com/18/role/N1aCover", "http://www.blackrock.com/18/role/N1aSupplement", "http://www.blackrock.com/18/role/OperatingExpensesData", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/18/role/PerformanceTableData", "http://www.blackrock.com/18/role/RiskReturn", "http://www.blackrock.com/18/role/ShareholderFeesData", "http://www.blackrock.com/19/role/BarChartData", "http://www.blackrock.com/19/role/ExpenseExample", "http://www.blackrock.com/19/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/19/role/FeesAndExpenses", "http://www.blackrock.com/19/role/InvestmentRisks", "http://www.blackrock.com/19/role/InvestmentStrategy", "http://www.blackrock.com/19/role/N1aCover", "http://www.blackrock.com/19/role/N1aSupplement", "http://www.blackrock.com/19/role/OperatingExpensesData", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/19/role/PerformanceTableData", "http://www.blackrock.com/19/role/RiskReturn", "http://www.blackrock.com/19/role/ShareholderFeesData", "http://www.blackrock.com/2/role/BarChartData", "http://www.blackrock.com/2/role/ExpenseExample", "http://www.blackrock.com/2/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/2/role/FeesAndExpenses", "http://www.blackrock.com/2/role/InvestmentRisks", "http://www.blackrock.com/2/role/InvestmentStrategy", "http://www.blackrock.com/2/role/N1aCover", "http://www.blackrock.com/2/role/N1aSupplement", "http://www.blackrock.com/2/role/OperatingExpensesData", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/2/role/PerformanceTableData", "http://www.blackrock.com/2/role/RiskReturn", "http://www.blackrock.com/2/role/ShareholderFeesData", "http://www.blackrock.com/20/role/BarChartData", "http://www.blackrock.com/20/role/ExpenseExample", "http://www.blackrock.com/20/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/20/role/FeesAndExpenses", "http://www.blackrock.com/20/role/InvestmentRisks", "http://www.blackrock.com/20/role/InvestmentStrategy", "http://www.blackrock.com/20/role/N1aCover", "http://www.blackrock.com/20/role/N1aSupplement", "http://www.blackrock.com/20/role/OperatingExpensesData", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/20/role/PerformanceTableData", "http://www.blackrock.com/20/role/RiskReturn", "http://www.blackrock.com/20/role/ShareholderFeesData", "http://www.blackrock.com/3/role/BarChartData", "http://www.blackrock.com/3/role/ExpenseExample", "http://www.blackrock.com/3/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/3/role/FeesAndExpenses", "http://www.blackrock.com/3/role/InvestmentRisks", "http://www.blackrock.com/3/role/InvestmentStrategy", "http://www.blackrock.com/3/role/N1aCover", "http://www.blackrock.com/3/role/N1aSupplement", "http://www.blackrock.com/3/role/OperatingExpensesData", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/3/role/PerformanceTableData", "http://www.blackrock.com/3/role/RiskReturn", "http://www.blackrock.com/3/role/ShareholderFeesData", "http://www.blackrock.com/4/role/BarChartData", "http://www.blackrock.com/4/role/ExpenseExample", "http://www.blackrock.com/4/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/4/role/FeesAndExpenses", "http://www.blackrock.com/4/role/InvestmentRisks", "http://www.blackrock.com/4/role/InvestmentStrategy", "http://www.blackrock.com/4/role/N1aCover", "http://www.blackrock.com/4/role/N1aSupplement", "http://www.blackrock.com/4/role/OperatingExpensesData", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/4/role/PerformanceTableData", "http://www.blackrock.com/4/role/RiskReturn", "http://www.blackrock.com/4/role/ShareholderFeesData", "http://www.blackrock.com/5/role/BarChartData", "http://www.blackrock.com/5/role/ExpenseExample", "http://www.blackrock.com/5/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/5/role/FeesAndExpenses", "http://www.blackrock.com/5/role/InvestmentRisks", "http://www.blackrock.com/5/role/InvestmentStrategy", "http://www.blackrock.com/5/role/N1aCover", "http://www.blackrock.com/5/role/N1aSupplement", "http://www.blackrock.com/5/role/OperatingExpensesData", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/5/role/PerformanceTableData", "http://www.blackrock.com/5/role/RiskReturn", "http://www.blackrock.com/5/role/ShareholderFeesData", "http://www.blackrock.com/6/role/BarChartData", "http://www.blackrock.com/6/role/ExpenseExample", "http://www.blackrock.com/6/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/6/role/FeesAndExpenses", "http://www.blackrock.com/6/role/InvestmentRisks", "http://www.blackrock.com/6/role/InvestmentStrategy", "http://www.blackrock.com/6/role/N1aCover", "http://www.blackrock.com/6/role/N1aSupplement", "http://www.blackrock.com/6/role/OperatingExpensesData", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/6/role/PerformanceTableData", "http://www.blackrock.com/6/role/RiskReturn", "http://www.blackrock.com/6/role/ShareholderFeesData", "http://www.blackrock.com/7/role/BarChartData", "http://www.blackrock.com/7/role/ExpenseExample", "http://www.blackrock.com/7/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/7/role/FeesAndExpenses", "http://www.blackrock.com/7/role/InvestmentRisks", "http://www.blackrock.com/7/role/InvestmentStrategy", "http://www.blackrock.com/7/role/N1aCover", "http://www.blackrock.com/7/role/N1aSupplement", "http://www.blackrock.com/7/role/OperatingExpensesData", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/7/role/PerformanceTableData", "http://www.blackrock.com/7/role/RiskReturn", "http://www.blackrock.com/7/role/ShareholderFeesData", "http://www.blackrock.com/8/role/BarChartData", "http://www.blackrock.com/8/role/ExpenseExample", "http://www.blackrock.com/8/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/8/role/FeesAndExpenses", "http://www.blackrock.com/8/role/InvestmentRisks", "http://www.blackrock.com/8/role/InvestmentStrategy", "http://www.blackrock.com/8/role/N1aCover", "http://www.blackrock.com/8/role/N1aSupplement", "http://www.blackrock.com/8/role/OperatingExpensesData", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/8/role/PerformanceTableData", "http://www.blackrock.com/8/role/RiskReturn", "http://www.blackrock.com/8/role/ShareholderFeesData", "http://www.blackrock.com/9/role/BarChartData", "http://www.blackrock.com/9/role/ExpenseExample", "http://www.blackrock.com/9/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/9/role/FeesAndExpenses", "http://www.blackrock.com/9/role/InvestmentRisks", "http://www.blackrock.com/9/role/InvestmentStrategy", "http://www.blackrock.com/9/role/N1aCover", "http://www.blackrock.com/9/role/N1aSupplement", "http://www.blackrock.com/9/role/OperatingExpensesData", "http://www.blackrock.com/9/role/PerformanceManagement", "http://www.blackrock.com/9/role/PerformanceTableData", "http://www.blackrock.com/9/role/RiskReturn", "http://www.blackrock.com/9/role/ShareholderFeesData", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/InvestmentRisks", "http://xbrl.sec.gov/rr/role/InvestmentStrategy", "http://xbrl.sec.gov/rr/role/N1aCover", "http://xbrl.sec.gov/rr/role/N1aSupplement", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/RiskReturn", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "Coregistrant [Axis]" } } }, "auth_ref": [ "r1" ] }, "bf3_DebtSecuritiesRiskMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "DebtSecuritiesRiskMember", "presentation": [ "http://www.blackrock.com/1/role/InvestmentRisks", "http://www.blackrock.com/10/role/InvestmentRisks", "http://www.blackrock.com/11/role/InvestmentRisks", "http://www.blackrock.com/12/role/InvestmentRisks", "http://www.blackrock.com/13/role/InvestmentRisks", "http://www.blackrock.com/14/role/InvestmentRisks", "http://www.blackrock.com/15/role/InvestmentRisks", "http://www.blackrock.com/16/role/InvestmentRisks", "http://www.blackrock.com/17/role/InvestmentRisks", "http://www.blackrock.com/18/role/InvestmentRisks", "http://www.blackrock.com/19/role/InvestmentRisks", "http://www.blackrock.com/2/role/InvestmentRisks", "http://www.blackrock.com/20/role/InvestmentRisks", "http://www.blackrock.com/3/role/InvestmentRisks", "http://www.blackrock.com/4/role/InvestmentRisks", "http://www.blackrock.com/5/role/InvestmentRisks", "http://www.blackrock.com/6/role/InvestmentRisks", "http://www.blackrock.com/7/role/InvestmentRisks", "http://www.blackrock.com/8/role/InvestmentRisks", "http://www.blackrock.com/9/role/InvestmentRisks" ], "lang": { "en-us": { "role": { "label": "Debt Securities Risk [Member]" } } }, "auth_ref": [] }, "bf3_DepositaryReceiptsRiskMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "DepositaryReceiptsRiskMember", "presentation": [ "http://www.blackrock.com/1/role/InvestmentRisks", "http://www.blackrock.com/10/role/InvestmentRisks", "http://www.blackrock.com/11/role/InvestmentRisks", "http://www.blackrock.com/12/role/InvestmentRisks", "http://www.blackrock.com/13/role/InvestmentRisks", "http://www.blackrock.com/14/role/InvestmentRisks", "http://www.blackrock.com/15/role/InvestmentRisks", "http://www.blackrock.com/16/role/InvestmentRisks", "http://www.blackrock.com/17/role/InvestmentRisks", "http://www.blackrock.com/18/role/InvestmentRisks", "http://www.blackrock.com/19/role/InvestmentRisks", "http://www.blackrock.com/2/role/InvestmentRisks", "http://www.blackrock.com/20/role/InvestmentRisks", "http://www.blackrock.com/3/role/InvestmentRisks", "http://www.blackrock.com/4/role/InvestmentRisks", "http://www.blackrock.com/5/role/InvestmentRisks", "http://www.blackrock.com/6/role/InvestmentRisks", "http://www.blackrock.com/7/role/InvestmentRisks", "http://www.blackrock.com/8/role/InvestmentRisks", "http://www.blackrock.com/9/role/InvestmentRisks" ], "lang": { "en-us": { "role": { "label": "Depositary Receipts Risk [Member]" } } }, "auth_ref": [] }, "bf3_DerivativesRisksMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "DerivativesRisksMember", "presentation": [ "http://www.blackrock.com/1/role/InvestmentRisks", "http://www.blackrock.com/10/role/InvestmentRisks", "http://www.blackrock.com/11/role/InvestmentRisks", "http://www.blackrock.com/12/role/InvestmentRisks", "http://www.blackrock.com/13/role/InvestmentRisks", "http://www.blackrock.com/14/role/InvestmentRisks", "http://www.blackrock.com/15/role/InvestmentRisks", "http://www.blackrock.com/16/role/InvestmentRisks", "http://www.blackrock.com/17/role/InvestmentRisks", "http://www.blackrock.com/18/role/InvestmentRisks", "http://www.blackrock.com/19/role/InvestmentRisks", "http://www.blackrock.com/2/role/InvestmentRisks", "http://www.blackrock.com/20/role/InvestmentRisks", "http://www.blackrock.com/3/role/InvestmentRisks", "http://www.blackrock.com/4/role/InvestmentRisks", "http://www.blackrock.com/5/role/InvestmentRisks", "http://www.blackrock.com/6/role/InvestmentRisks", "http://www.blackrock.com/7/role/InvestmentRisks", "http://www.blackrock.com/8/role/InvestmentRisks", "http://www.blackrock.com/9/role/InvestmentRisks" ], "lang": { "en-us": { "role": { "label": "Derivatives Risks [Member]" } } }, "auth_ref": [] }, "oef_DistributionAndService12b1FeesOverAssets": { "xbrltype": "nonNegativePure4ItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "DistributionAndService12b1FeesOverAssets", "calculation": { "http://xbrl.sec.gov/rr/role/OperatingExpensesData": { "parentTag": "oef_ExpensesOverAssets", "weight": 1.0, "order": 2.0 } }, "presentation": [ "http://www.blackrock.com/1/role/OperatingExpensesData", "http://www.blackrock.com/10/role/OperatingExpensesData", "http://www.blackrock.com/11/role/OperatingExpensesData", "http://www.blackrock.com/12/role/OperatingExpensesData", "http://www.blackrock.com/13/role/OperatingExpensesData", "http://www.blackrock.com/14/role/OperatingExpensesData", "http://www.blackrock.com/15/role/OperatingExpensesData", "http://www.blackrock.com/16/role/OperatingExpensesData", "http://www.blackrock.com/17/role/OperatingExpensesData", "http://www.blackrock.com/18/role/OperatingExpensesData", "http://www.blackrock.com/19/role/OperatingExpensesData", "http://www.blackrock.com/2/role/OperatingExpensesData", "http://www.blackrock.com/20/role/OperatingExpensesData", "http://www.blackrock.com/3/role/OperatingExpensesData", "http://www.blackrock.com/4/role/OperatingExpensesData", "http://www.blackrock.com/5/role/OperatingExpensesData", "http://www.blackrock.com/6/role/OperatingExpensesData", "http://www.blackrock.com/7/role/OperatingExpensesData", "http://www.blackrock.com/8/role/OperatingExpensesData", "http://www.blackrock.com/9/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/OperatingExpensesData" ], "lang": { "en-us": { "role": { "label": "Distribution and Service (12b-1) Fees" } } }, "auth_ref": [ "r19" ] }, "oef_DistributionOrSimilarNon12b1FeesOverAssets": { "xbrltype": "nonNegativePure4ItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "DistributionOrSimilarNon12b1FeesOverAssets", "calculation": { "http://xbrl.sec.gov/rr/role/OperatingExpensesData": { "parentTag": "oef_ExpensesOverAssets", "weight": 1.0, "order": 3.0 } }, "presentation": [ "http://www.blackrock.com/1/role/OperatingExpensesData", "http://www.blackrock.com/10/role/OperatingExpensesData", "http://www.blackrock.com/11/role/OperatingExpensesData", "http://www.blackrock.com/12/role/OperatingExpensesData", "http://www.blackrock.com/13/role/OperatingExpensesData", "http://www.blackrock.com/14/role/OperatingExpensesData", "http://www.blackrock.com/15/role/OperatingExpensesData", "http://www.blackrock.com/16/role/OperatingExpensesData", "http://www.blackrock.com/17/role/OperatingExpensesData", "http://www.blackrock.com/18/role/OperatingExpensesData", "http://www.blackrock.com/19/role/OperatingExpensesData", "http://www.blackrock.com/2/role/OperatingExpensesData", "http://www.blackrock.com/20/role/OperatingExpensesData", "http://www.blackrock.com/3/role/OperatingExpensesData", "http://www.blackrock.com/4/role/OperatingExpensesData", "http://www.blackrock.com/5/role/OperatingExpensesData", "http://www.blackrock.com/6/role/OperatingExpensesData", "http://www.blackrock.com/7/role/OperatingExpensesData", "http://www.blackrock.com/8/role/OperatingExpensesData", "http://www.blackrock.com/9/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/OperatingExpensesData" ], "lang": { "en-us": { "role": { "label": "Distribution or Similar (Non 12b-1) Fees" } } }, "auth_ref": [ "r19" ] }, "dei_DocumentDomain": { "xbrltype": "domainItemType", "nsuri": "http://xbrl.sec.gov/dei/2025", "localname": "DocumentDomain", "presentation": [ "http://www.blackrock.com/1/role/BarChartData", "http://www.blackrock.com/1/role/ExpenseExample", "http://www.blackrock.com/1/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/1/role/FeesAndExpenses", "http://www.blackrock.com/1/role/InvestmentRisks", "http://www.blackrock.com/1/role/InvestmentStrategy", "http://www.blackrock.com/1/role/N1aCover", "http://www.blackrock.com/1/role/N1aSupplement", "http://www.blackrock.com/1/role/OperatingExpensesData", "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/1/role/PerformanceTableData", "http://www.blackrock.com/1/role/RiskReturn", "http://www.blackrock.com/1/role/ShareholderFeesData", "http://www.blackrock.com/10/role/BarChartData", "http://www.blackrock.com/10/role/ExpenseExample", "http://www.blackrock.com/10/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/10/role/FeesAndExpenses", "http://www.blackrock.com/10/role/InvestmentRisks", "http://www.blackrock.com/10/role/InvestmentStrategy", "http://www.blackrock.com/10/role/N1aCover", "http://www.blackrock.com/10/role/N1aSupplement", "http://www.blackrock.com/10/role/OperatingExpensesData", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/10/role/PerformanceTableData", "http://www.blackrock.com/10/role/RiskReturn", "http://www.blackrock.com/10/role/ShareholderFeesData", "http://www.blackrock.com/11/role/BarChartData", "http://www.blackrock.com/11/role/ExpenseExample", "http://www.blackrock.com/11/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/11/role/FeesAndExpenses", "http://www.blackrock.com/11/role/InvestmentRisks", "http://www.blackrock.com/11/role/InvestmentStrategy", "http://www.blackrock.com/11/role/N1aCover", "http://www.blackrock.com/11/role/N1aSupplement", "http://www.blackrock.com/11/role/OperatingExpensesData", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/11/role/PerformanceTableData", "http://www.blackrock.com/11/role/RiskReturn", "http://www.blackrock.com/11/role/ShareholderFeesData", "http://www.blackrock.com/12/role/BarChartData", "http://www.blackrock.com/12/role/ExpenseExample", "http://www.blackrock.com/12/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/12/role/FeesAndExpenses", "http://www.blackrock.com/12/role/InvestmentRisks", "http://www.blackrock.com/12/role/InvestmentStrategy", "http://www.blackrock.com/12/role/N1aCover", "http://www.blackrock.com/12/role/N1aSupplement", "http://www.blackrock.com/12/role/OperatingExpensesData", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/12/role/PerformanceTableData", "http://www.blackrock.com/12/role/RiskReturn", "http://www.blackrock.com/12/role/ShareholderFeesData", "http://www.blackrock.com/13/role/BarChartData", "http://www.blackrock.com/13/role/ExpenseExample", "http://www.blackrock.com/13/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/13/role/FeesAndExpenses", "http://www.blackrock.com/13/role/InvestmentRisks", "http://www.blackrock.com/13/role/InvestmentStrategy", "http://www.blackrock.com/13/role/N1aCover", "http://www.blackrock.com/13/role/N1aSupplement", "http://www.blackrock.com/13/role/OperatingExpensesData", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/13/role/PerformanceTableData", "http://www.blackrock.com/13/role/RiskReturn", "http://www.blackrock.com/13/role/ShareholderFeesData", "http://www.blackrock.com/14/role/BarChartData", "http://www.blackrock.com/14/role/ExpenseExample", "http://www.blackrock.com/14/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/14/role/FeesAndExpenses", "http://www.blackrock.com/14/role/InvestmentRisks", "http://www.blackrock.com/14/role/InvestmentStrategy", "http://www.blackrock.com/14/role/N1aCover", "http://www.blackrock.com/14/role/N1aSupplement", "http://www.blackrock.com/14/role/OperatingExpensesData", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/14/role/PerformanceTableData", "http://www.blackrock.com/14/role/RiskReturn", "http://www.blackrock.com/14/role/ShareholderFeesData", "http://www.blackrock.com/15/role/BarChartData", "http://www.blackrock.com/15/role/ExpenseExample", "http://www.blackrock.com/15/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/15/role/FeesAndExpenses", "http://www.blackrock.com/15/role/InvestmentRisks", "http://www.blackrock.com/15/role/InvestmentStrategy", "http://www.blackrock.com/15/role/N1aCover", "http://www.blackrock.com/15/role/N1aSupplement", "http://www.blackrock.com/15/role/OperatingExpensesData", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/15/role/PerformanceTableData", "http://www.blackrock.com/15/role/RiskReturn", "http://www.blackrock.com/15/role/ShareholderFeesData", "http://www.blackrock.com/16/role/BarChartData", "http://www.blackrock.com/16/role/ExpenseExample", "http://www.blackrock.com/16/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/16/role/FeesAndExpenses", "http://www.blackrock.com/16/role/InvestmentRisks", "http://www.blackrock.com/16/role/InvestmentStrategy", "http://www.blackrock.com/16/role/N1aCover", "http://www.blackrock.com/16/role/N1aSupplement", "http://www.blackrock.com/16/role/OperatingExpensesData", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/16/role/PerformanceTableData", "http://www.blackrock.com/16/role/RiskReturn", "http://www.blackrock.com/16/role/ShareholderFeesData", "http://www.blackrock.com/17/role/BarChartData", "http://www.blackrock.com/17/role/ExpenseExample", "http://www.blackrock.com/17/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/17/role/FeesAndExpenses", "http://www.blackrock.com/17/role/InvestmentRisks", "http://www.blackrock.com/17/role/InvestmentStrategy", "http://www.blackrock.com/17/role/N1aCover", "http://www.blackrock.com/17/role/N1aSupplement", "http://www.blackrock.com/17/role/OperatingExpensesData", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/17/role/PerformanceTableData", "http://www.blackrock.com/17/role/RiskReturn", "http://www.blackrock.com/17/role/ShareholderFeesData", "http://www.blackrock.com/18/role/BarChartData", "http://www.blackrock.com/18/role/ExpenseExample", "http://www.blackrock.com/18/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/18/role/FeesAndExpenses", "http://www.blackrock.com/18/role/InvestmentRisks", "http://www.blackrock.com/18/role/InvestmentStrategy", "http://www.blackrock.com/18/role/N1aCover", "http://www.blackrock.com/18/role/N1aSupplement", "http://www.blackrock.com/18/role/OperatingExpensesData", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/18/role/PerformanceTableData", "http://www.blackrock.com/18/role/RiskReturn", "http://www.blackrock.com/18/role/ShareholderFeesData", "http://www.blackrock.com/19/role/BarChartData", "http://www.blackrock.com/19/role/ExpenseExample", "http://www.blackrock.com/19/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/19/role/FeesAndExpenses", "http://www.blackrock.com/19/role/InvestmentRisks", "http://www.blackrock.com/19/role/InvestmentStrategy", "http://www.blackrock.com/19/role/N1aCover", "http://www.blackrock.com/19/role/N1aSupplement", "http://www.blackrock.com/19/role/OperatingExpensesData", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/19/role/PerformanceTableData", "http://www.blackrock.com/19/role/RiskReturn", "http://www.blackrock.com/19/role/ShareholderFeesData", "http://www.blackrock.com/2/role/BarChartData", "http://www.blackrock.com/2/role/ExpenseExample", "http://www.blackrock.com/2/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/2/role/FeesAndExpenses", "http://www.blackrock.com/2/role/InvestmentRisks", "http://www.blackrock.com/2/role/InvestmentStrategy", "http://www.blackrock.com/2/role/N1aCover", "http://www.blackrock.com/2/role/N1aSupplement", "http://www.blackrock.com/2/role/OperatingExpensesData", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/2/role/PerformanceTableData", "http://www.blackrock.com/2/role/RiskReturn", "http://www.blackrock.com/2/role/ShareholderFeesData", "http://www.blackrock.com/20/role/BarChartData", "http://www.blackrock.com/20/role/ExpenseExample", "http://www.blackrock.com/20/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/20/role/FeesAndExpenses", "http://www.blackrock.com/20/role/InvestmentRisks", "http://www.blackrock.com/20/role/InvestmentStrategy", "http://www.blackrock.com/20/role/N1aCover", "http://www.blackrock.com/20/role/N1aSupplement", "http://www.blackrock.com/20/role/OperatingExpensesData", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/20/role/PerformanceTableData", "http://www.blackrock.com/20/role/RiskReturn", "http://www.blackrock.com/20/role/ShareholderFeesData", "http://www.blackrock.com/3/role/BarChartData", "http://www.blackrock.com/3/role/ExpenseExample", "http://www.blackrock.com/3/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/3/role/FeesAndExpenses", "http://www.blackrock.com/3/role/InvestmentRisks", "http://www.blackrock.com/3/role/InvestmentStrategy", "http://www.blackrock.com/3/role/N1aCover", "http://www.blackrock.com/3/role/N1aSupplement", "http://www.blackrock.com/3/role/OperatingExpensesData", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/3/role/PerformanceTableData", "http://www.blackrock.com/3/role/RiskReturn", "http://www.blackrock.com/3/role/ShareholderFeesData", "http://www.blackrock.com/4/role/BarChartData", "http://www.blackrock.com/4/role/ExpenseExample", "http://www.blackrock.com/4/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/4/role/FeesAndExpenses", "http://www.blackrock.com/4/role/InvestmentRisks", "http://www.blackrock.com/4/role/InvestmentStrategy", "http://www.blackrock.com/4/role/N1aCover", "http://www.blackrock.com/4/role/N1aSupplement", "http://www.blackrock.com/4/role/OperatingExpensesData", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/4/role/PerformanceTableData", "http://www.blackrock.com/4/role/RiskReturn", "http://www.blackrock.com/4/role/ShareholderFeesData", "http://www.blackrock.com/5/role/BarChartData", "http://www.blackrock.com/5/role/ExpenseExample", "http://www.blackrock.com/5/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/5/role/FeesAndExpenses", "http://www.blackrock.com/5/role/InvestmentRisks", "http://www.blackrock.com/5/role/InvestmentStrategy", "http://www.blackrock.com/5/role/N1aCover", "http://www.blackrock.com/5/role/N1aSupplement", "http://www.blackrock.com/5/role/OperatingExpensesData", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/5/role/PerformanceTableData", "http://www.blackrock.com/5/role/RiskReturn", "http://www.blackrock.com/5/role/ShareholderFeesData", "http://www.blackrock.com/6/role/BarChartData", "http://www.blackrock.com/6/role/ExpenseExample", "http://www.blackrock.com/6/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/6/role/FeesAndExpenses", "http://www.blackrock.com/6/role/InvestmentRisks", "http://www.blackrock.com/6/role/InvestmentStrategy", "http://www.blackrock.com/6/role/N1aCover", "http://www.blackrock.com/6/role/N1aSupplement", "http://www.blackrock.com/6/role/OperatingExpensesData", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/6/role/PerformanceTableData", "http://www.blackrock.com/6/role/RiskReturn", "http://www.blackrock.com/6/role/ShareholderFeesData", "http://www.blackrock.com/7/role/BarChartData", "http://www.blackrock.com/7/role/ExpenseExample", "http://www.blackrock.com/7/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/7/role/FeesAndExpenses", "http://www.blackrock.com/7/role/InvestmentRisks", "http://www.blackrock.com/7/role/InvestmentStrategy", "http://www.blackrock.com/7/role/N1aCover", "http://www.blackrock.com/7/role/N1aSupplement", "http://www.blackrock.com/7/role/OperatingExpensesData", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/7/role/PerformanceTableData", "http://www.blackrock.com/7/role/RiskReturn", "http://www.blackrock.com/7/role/ShareholderFeesData", "http://www.blackrock.com/8/role/BarChartData", "http://www.blackrock.com/8/role/ExpenseExample", "http://www.blackrock.com/8/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/8/role/FeesAndExpenses", "http://www.blackrock.com/8/role/InvestmentRisks", "http://www.blackrock.com/8/role/InvestmentStrategy", "http://www.blackrock.com/8/role/N1aCover", "http://www.blackrock.com/8/role/N1aSupplement", "http://www.blackrock.com/8/role/OperatingExpensesData", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/8/role/PerformanceTableData", "http://www.blackrock.com/8/role/RiskReturn", "http://www.blackrock.com/8/role/ShareholderFeesData", "http://www.blackrock.com/9/role/BarChartData", "http://www.blackrock.com/9/role/ExpenseExample", "http://www.blackrock.com/9/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/9/role/FeesAndExpenses", "http://www.blackrock.com/9/role/InvestmentRisks", "http://www.blackrock.com/9/role/InvestmentStrategy", "http://www.blackrock.com/9/role/N1aCover", "http://www.blackrock.com/9/role/N1aSupplement", "http://www.blackrock.com/9/role/OperatingExpensesData", "http://www.blackrock.com/9/role/PerformanceManagement", "http://www.blackrock.com/9/role/PerformanceTableData", "http://www.blackrock.com/9/role/RiskReturn", "http://www.blackrock.com/9/role/ShareholderFeesData", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/InvestmentRisks", "http://xbrl.sec.gov/rr/role/InvestmentStrategy", "http://xbrl.sec.gov/rr/role/N1aCover", "http://xbrl.sec.gov/rr/role/N1aSupplement", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/RiskReturn", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "Prospectus", "documentation": "Type of the document as assigned by the filer, corresponding to SEC document naming convention standards." } } }, "auth_ref": [] }, "dei_DocumentInformationDocumentAxis": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/dei/2025", "localname": "DocumentInformationDocumentAxis", "presentation": [ "http://www.blackrock.com/1/role/BarChartData", "http://www.blackrock.com/1/role/ExpenseExample", "http://www.blackrock.com/1/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/1/role/FeesAndExpenses", "http://www.blackrock.com/1/role/InvestmentRisks", "http://www.blackrock.com/1/role/InvestmentStrategy", "http://www.blackrock.com/1/role/N1aCover", "http://www.blackrock.com/1/role/N1aSupplement", "http://www.blackrock.com/1/role/OperatingExpensesData", "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/1/role/PerformanceTableData", "http://www.blackrock.com/1/role/RiskReturn", "http://www.blackrock.com/1/role/ShareholderFeesData", "http://www.blackrock.com/10/role/BarChartData", "http://www.blackrock.com/10/role/ExpenseExample", "http://www.blackrock.com/10/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/10/role/FeesAndExpenses", "http://www.blackrock.com/10/role/InvestmentRisks", "http://www.blackrock.com/10/role/InvestmentStrategy", "http://www.blackrock.com/10/role/N1aCover", "http://www.blackrock.com/10/role/N1aSupplement", "http://www.blackrock.com/10/role/OperatingExpensesData", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/10/role/PerformanceTableData", "http://www.blackrock.com/10/role/RiskReturn", "http://www.blackrock.com/10/role/ShareholderFeesData", "http://www.blackrock.com/11/role/BarChartData", "http://www.blackrock.com/11/role/ExpenseExample", "http://www.blackrock.com/11/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/11/role/FeesAndExpenses", "http://www.blackrock.com/11/role/InvestmentRisks", "http://www.blackrock.com/11/role/InvestmentStrategy", "http://www.blackrock.com/11/role/N1aCover", "http://www.blackrock.com/11/role/N1aSupplement", "http://www.blackrock.com/11/role/OperatingExpensesData", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/11/role/PerformanceTableData", "http://www.blackrock.com/11/role/RiskReturn", "http://www.blackrock.com/11/role/ShareholderFeesData", "http://www.blackrock.com/12/role/BarChartData", "http://www.blackrock.com/12/role/ExpenseExample", "http://www.blackrock.com/12/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/12/role/FeesAndExpenses", "http://www.blackrock.com/12/role/InvestmentRisks", "http://www.blackrock.com/12/role/InvestmentStrategy", "http://www.blackrock.com/12/role/N1aCover", "http://www.blackrock.com/12/role/N1aSupplement", "http://www.blackrock.com/12/role/OperatingExpensesData", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/12/role/PerformanceTableData", "http://www.blackrock.com/12/role/RiskReturn", "http://www.blackrock.com/12/role/ShareholderFeesData", "http://www.blackrock.com/13/role/BarChartData", "http://www.blackrock.com/13/role/ExpenseExample", "http://www.blackrock.com/13/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/13/role/FeesAndExpenses", "http://www.blackrock.com/13/role/InvestmentRisks", "http://www.blackrock.com/13/role/InvestmentStrategy", "http://www.blackrock.com/13/role/N1aCover", "http://www.blackrock.com/13/role/N1aSupplement", "http://www.blackrock.com/13/role/OperatingExpensesData", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/13/role/PerformanceTableData", "http://www.blackrock.com/13/role/RiskReturn", "http://www.blackrock.com/13/role/ShareholderFeesData", "http://www.blackrock.com/14/role/BarChartData", "http://www.blackrock.com/14/role/ExpenseExample", "http://www.blackrock.com/14/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/14/role/FeesAndExpenses", "http://www.blackrock.com/14/role/InvestmentRisks", "http://www.blackrock.com/14/role/InvestmentStrategy", "http://www.blackrock.com/14/role/N1aCover", "http://www.blackrock.com/14/role/N1aSupplement", "http://www.blackrock.com/14/role/OperatingExpensesData", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/14/role/PerformanceTableData", "http://www.blackrock.com/14/role/RiskReturn", "http://www.blackrock.com/14/role/ShareholderFeesData", "http://www.blackrock.com/15/role/BarChartData", "http://www.blackrock.com/15/role/ExpenseExample", "http://www.blackrock.com/15/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/15/role/FeesAndExpenses", "http://www.blackrock.com/15/role/InvestmentRisks", "http://www.blackrock.com/15/role/InvestmentStrategy", "http://www.blackrock.com/15/role/N1aCover", "http://www.blackrock.com/15/role/N1aSupplement", "http://www.blackrock.com/15/role/OperatingExpensesData", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/15/role/PerformanceTableData", "http://www.blackrock.com/15/role/RiskReturn", "http://www.blackrock.com/15/role/ShareholderFeesData", "http://www.blackrock.com/16/role/BarChartData", "http://www.blackrock.com/16/role/ExpenseExample", "http://www.blackrock.com/16/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/16/role/FeesAndExpenses", "http://www.blackrock.com/16/role/InvestmentRisks", "http://www.blackrock.com/16/role/InvestmentStrategy", "http://www.blackrock.com/16/role/N1aCover", "http://www.blackrock.com/16/role/N1aSupplement", "http://www.blackrock.com/16/role/OperatingExpensesData", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/16/role/PerformanceTableData", "http://www.blackrock.com/16/role/RiskReturn", "http://www.blackrock.com/16/role/ShareholderFeesData", "http://www.blackrock.com/17/role/BarChartData", "http://www.blackrock.com/17/role/ExpenseExample", "http://www.blackrock.com/17/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/17/role/FeesAndExpenses", "http://www.blackrock.com/17/role/InvestmentRisks", "http://www.blackrock.com/17/role/InvestmentStrategy", "http://www.blackrock.com/17/role/N1aCover", "http://www.blackrock.com/17/role/N1aSupplement", "http://www.blackrock.com/17/role/OperatingExpensesData", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/17/role/PerformanceTableData", "http://www.blackrock.com/17/role/RiskReturn", "http://www.blackrock.com/17/role/ShareholderFeesData", "http://www.blackrock.com/18/role/BarChartData", "http://www.blackrock.com/18/role/ExpenseExample", "http://www.blackrock.com/18/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/18/role/FeesAndExpenses", "http://www.blackrock.com/18/role/InvestmentRisks", "http://www.blackrock.com/18/role/InvestmentStrategy", "http://www.blackrock.com/18/role/N1aCover", "http://www.blackrock.com/18/role/N1aSupplement", "http://www.blackrock.com/18/role/OperatingExpensesData", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/18/role/PerformanceTableData", "http://www.blackrock.com/18/role/RiskReturn", "http://www.blackrock.com/18/role/ShareholderFeesData", "http://www.blackrock.com/19/role/BarChartData", "http://www.blackrock.com/19/role/ExpenseExample", "http://www.blackrock.com/19/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/19/role/FeesAndExpenses", "http://www.blackrock.com/19/role/InvestmentRisks", "http://www.blackrock.com/19/role/InvestmentStrategy", "http://www.blackrock.com/19/role/N1aCover", "http://www.blackrock.com/19/role/N1aSupplement", "http://www.blackrock.com/19/role/OperatingExpensesData", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/19/role/PerformanceTableData", "http://www.blackrock.com/19/role/RiskReturn", "http://www.blackrock.com/19/role/ShareholderFeesData", "http://www.blackrock.com/2/role/BarChartData", "http://www.blackrock.com/2/role/ExpenseExample", "http://www.blackrock.com/2/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/2/role/FeesAndExpenses", "http://www.blackrock.com/2/role/InvestmentRisks", "http://www.blackrock.com/2/role/InvestmentStrategy", "http://www.blackrock.com/2/role/N1aCover", "http://www.blackrock.com/2/role/N1aSupplement", "http://www.blackrock.com/2/role/OperatingExpensesData", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/2/role/PerformanceTableData", "http://www.blackrock.com/2/role/RiskReturn", "http://www.blackrock.com/2/role/ShareholderFeesData", "http://www.blackrock.com/20/role/BarChartData", "http://www.blackrock.com/20/role/ExpenseExample", "http://www.blackrock.com/20/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/20/role/FeesAndExpenses", "http://www.blackrock.com/20/role/InvestmentRisks", "http://www.blackrock.com/20/role/InvestmentStrategy", "http://www.blackrock.com/20/role/N1aCover", "http://www.blackrock.com/20/role/N1aSupplement", "http://www.blackrock.com/20/role/OperatingExpensesData", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/20/role/PerformanceTableData", "http://www.blackrock.com/20/role/RiskReturn", "http://www.blackrock.com/20/role/ShareholderFeesData", "http://www.blackrock.com/3/role/BarChartData", "http://www.blackrock.com/3/role/ExpenseExample", "http://www.blackrock.com/3/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/3/role/FeesAndExpenses", "http://www.blackrock.com/3/role/InvestmentRisks", "http://www.blackrock.com/3/role/InvestmentStrategy", "http://www.blackrock.com/3/role/N1aCover", "http://www.blackrock.com/3/role/N1aSupplement", "http://www.blackrock.com/3/role/OperatingExpensesData", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/3/role/PerformanceTableData", "http://www.blackrock.com/3/role/RiskReturn", "http://www.blackrock.com/3/role/ShareholderFeesData", "http://www.blackrock.com/4/role/BarChartData", "http://www.blackrock.com/4/role/ExpenseExample", "http://www.blackrock.com/4/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/4/role/FeesAndExpenses", "http://www.blackrock.com/4/role/InvestmentRisks", "http://www.blackrock.com/4/role/InvestmentStrategy", "http://www.blackrock.com/4/role/N1aCover", "http://www.blackrock.com/4/role/N1aSupplement", "http://www.blackrock.com/4/role/OperatingExpensesData", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/4/role/PerformanceTableData", "http://www.blackrock.com/4/role/RiskReturn", "http://www.blackrock.com/4/role/ShareholderFeesData", "http://www.blackrock.com/5/role/BarChartData", "http://www.blackrock.com/5/role/ExpenseExample", "http://www.blackrock.com/5/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/5/role/FeesAndExpenses", "http://www.blackrock.com/5/role/InvestmentRisks", "http://www.blackrock.com/5/role/InvestmentStrategy", "http://www.blackrock.com/5/role/N1aCover", "http://www.blackrock.com/5/role/N1aSupplement", "http://www.blackrock.com/5/role/OperatingExpensesData", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/5/role/PerformanceTableData", "http://www.blackrock.com/5/role/RiskReturn", "http://www.blackrock.com/5/role/ShareholderFeesData", "http://www.blackrock.com/6/role/BarChartData", "http://www.blackrock.com/6/role/ExpenseExample", "http://www.blackrock.com/6/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/6/role/FeesAndExpenses", "http://www.blackrock.com/6/role/InvestmentRisks", "http://www.blackrock.com/6/role/InvestmentStrategy", "http://www.blackrock.com/6/role/N1aCover", "http://www.blackrock.com/6/role/N1aSupplement", "http://www.blackrock.com/6/role/OperatingExpensesData", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/6/role/PerformanceTableData", "http://www.blackrock.com/6/role/RiskReturn", "http://www.blackrock.com/6/role/ShareholderFeesData", "http://www.blackrock.com/7/role/BarChartData", "http://www.blackrock.com/7/role/ExpenseExample", "http://www.blackrock.com/7/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/7/role/FeesAndExpenses", "http://www.blackrock.com/7/role/InvestmentRisks", "http://www.blackrock.com/7/role/InvestmentStrategy", "http://www.blackrock.com/7/role/N1aCover", "http://www.blackrock.com/7/role/N1aSupplement", "http://www.blackrock.com/7/role/OperatingExpensesData", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/7/role/PerformanceTableData", "http://www.blackrock.com/7/role/RiskReturn", "http://www.blackrock.com/7/role/ShareholderFeesData", "http://www.blackrock.com/8/role/BarChartData", "http://www.blackrock.com/8/role/ExpenseExample", "http://www.blackrock.com/8/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/8/role/FeesAndExpenses", "http://www.blackrock.com/8/role/InvestmentRisks", "http://www.blackrock.com/8/role/InvestmentStrategy", "http://www.blackrock.com/8/role/N1aCover", "http://www.blackrock.com/8/role/N1aSupplement", "http://www.blackrock.com/8/role/OperatingExpensesData", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/8/role/PerformanceTableData", "http://www.blackrock.com/8/role/RiskReturn", "http://www.blackrock.com/8/role/ShareholderFeesData", "http://www.blackrock.com/9/role/BarChartData", "http://www.blackrock.com/9/role/ExpenseExample", "http://www.blackrock.com/9/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/9/role/FeesAndExpenses", "http://www.blackrock.com/9/role/InvestmentRisks", "http://www.blackrock.com/9/role/InvestmentStrategy", "http://www.blackrock.com/9/role/N1aCover", "http://www.blackrock.com/9/role/N1aSupplement", "http://www.blackrock.com/9/role/OperatingExpensesData", "http://www.blackrock.com/9/role/PerformanceManagement", "http://www.blackrock.com/9/role/PerformanceTableData", "http://www.blackrock.com/9/role/RiskReturn", "http://www.blackrock.com/9/role/ShareholderFeesData", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/InvestmentRisks", "http://xbrl.sec.gov/rr/role/InvestmentStrategy", "http://xbrl.sec.gov/rr/role/N1aCover", "http://xbrl.sec.gov/rr/role/N1aSupplement", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/RiskReturn", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "Document [Axis]", "documentation": "The axis of a table defines the relationship between the domain members or categories in the table and the line items or concepts that complete the table." } } }, "auth_ref": [] }, "dei_DocumentPeriodEndDate": { "xbrltype": "dateItemType", "nsuri": "http://xbrl.sec.gov/dei/2025", "localname": "DocumentPeriodEndDate", "presentation": [ "http://www.blackrock.com/1/role/N1aCover", "http://www.blackrock.com/10/role/N1aCover", "http://www.blackrock.com/11/role/N1aCover", "http://www.blackrock.com/12/role/N1aCover", "http://www.blackrock.com/13/role/N1aCover", "http://www.blackrock.com/14/role/N1aCover", "http://www.blackrock.com/15/role/N1aCover", "http://www.blackrock.com/16/role/N1aCover", "http://www.blackrock.com/17/role/N1aCover", "http://www.blackrock.com/18/role/N1aCover", "http://www.blackrock.com/19/role/N1aCover", "http://www.blackrock.com/2/role/N1aCover", "http://www.blackrock.com/20/role/N1aCover", "http://www.blackrock.com/3/role/N1aCover", "http://www.blackrock.com/4/role/N1aCover", "http://www.blackrock.com/5/role/N1aCover", "http://www.blackrock.com/6/role/N1aCover", "http://www.blackrock.com/7/role/N1aCover", "http://www.blackrock.com/8/role/N1aCover", "http://www.blackrock.com/9/role/N1aCover", "http://xbrl.sec.gov/rr/role/N1aCover" ], "lang": { "en-us": { "role": { "label": "Document Period End Date", "documentation": "For the EDGAR submission types of Form 8-K: the date of the report, the date of the earliest event reported; for the EDGAR submission types of Form N-1A: the filing date; for all other submission types: the end of the reporting or transition period. The format of the date is YYYY-MM-DD." } } }, "auth_ref": [] }, "dei_DocumentType": { "xbrltype": "submissionTypeItemType", "nsuri": "http://xbrl.sec.gov/dei/2025", "localname": "DocumentType", "presentation": [ "http://www.blackrock.com/1/role/N1aCover", "http://www.blackrock.com/10/role/N1aCover", "http://www.blackrock.com/11/role/N1aCover", "http://www.blackrock.com/12/role/N1aCover", "http://www.blackrock.com/13/role/N1aCover", "http://www.blackrock.com/14/role/N1aCover", "http://www.blackrock.com/15/role/N1aCover", "http://www.blackrock.com/16/role/N1aCover", "http://www.blackrock.com/17/role/N1aCover", "http://www.blackrock.com/18/role/N1aCover", "http://www.blackrock.com/19/role/N1aCover", "http://www.blackrock.com/2/role/N1aCover", "http://www.blackrock.com/20/role/N1aCover", "http://www.blackrock.com/3/role/N1aCover", "http://www.blackrock.com/4/role/N1aCover", "http://www.blackrock.com/5/role/N1aCover", "http://www.blackrock.com/6/role/N1aCover", "http://www.blackrock.com/7/role/N1aCover", "http://www.blackrock.com/8/role/N1aCover", "http://www.blackrock.com/9/role/N1aCover", "http://xbrl.sec.gov/rr/role/N1aCover" ], "lang": { "en-us": { "role": { "label": "Document Type", "documentation": "The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'." } } }, "auth_ref": [] }, "bf3_EmergingMarketsRiskMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "EmergingMarketsRiskMember", "presentation": [ "http://www.blackrock.com/1/role/InvestmentRisks", "http://www.blackrock.com/10/role/InvestmentRisks", "http://www.blackrock.com/11/role/InvestmentRisks", "http://www.blackrock.com/12/role/InvestmentRisks", "http://www.blackrock.com/13/role/InvestmentRisks", "http://www.blackrock.com/14/role/InvestmentRisks", "http://www.blackrock.com/15/role/InvestmentRisks", "http://www.blackrock.com/16/role/InvestmentRisks", "http://www.blackrock.com/17/role/InvestmentRisks", "http://www.blackrock.com/18/role/InvestmentRisks", "http://www.blackrock.com/19/role/InvestmentRisks", "http://www.blackrock.com/2/role/InvestmentRisks", "http://www.blackrock.com/20/role/InvestmentRisks", "http://www.blackrock.com/3/role/InvestmentRisks", "http://www.blackrock.com/4/role/InvestmentRisks", "http://www.blackrock.com/5/role/InvestmentRisks", "http://www.blackrock.com/6/role/InvestmentRisks", "http://www.blackrock.com/7/role/InvestmentRisks", "http://www.blackrock.com/8/role/InvestmentRisks", "http://www.blackrock.com/9/role/InvestmentRisks" ], "lang": { "en-us": { "role": { "label": "Emerging Markets Risk [Member]" } } }, "auth_ref": [] }, "dei_EntityCentralIndexKey": { "xbrltype": "centralIndexKeyItemType", "nsuri": "http://xbrl.sec.gov/dei/2025", "localname": "EntityCentralIndexKey", "presentation": [ "http://www.blackrock.com/1/role/N1aCover", "http://www.blackrock.com/10/role/N1aCover", "http://www.blackrock.com/11/role/N1aCover", "http://www.blackrock.com/12/role/N1aCover", "http://www.blackrock.com/13/role/N1aCover", "http://www.blackrock.com/14/role/N1aCover", "http://www.blackrock.com/15/role/N1aCover", "http://www.blackrock.com/16/role/N1aCover", "http://www.blackrock.com/17/role/N1aCover", "http://www.blackrock.com/18/role/N1aCover", "http://www.blackrock.com/19/role/N1aCover", "http://www.blackrock.com/2/role/N1aCover", "http://www.blackrock.com/20/role/N1aCover", "http://www.blackrock.com/3/role/N1aCover", "http://www.blackrock.com/4/role/N1aCover", "http://www.blackrock.com/5/role/N1aCover", "http://www.blackrock.com/6/role/N1aCover", "http://www.blackrock.com/7/role/N1aCover", "http://www.blackrock.com/8/role/N1aCover", "http://www.blackrock.com/9/role/N1aCover", "http://xbrl.sec.gov/rr/role/N1aCover" ], "lang": { "en-us": { "role": { "label": "Entity Central Index Key", "documentation": "A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK." } } }, "auth_ref": [ "r0" ] }, "dei_EntityDomain": { "xbrltype": "domainItemType", "nsuri": "http://xbrl.sec.gov/dei/2025", "localname": "EntityDomain", "presentation": [ "http://www.blackrock.com/1/role/BarChartData", "http://www.blackrock.com/1/role/ExpenseExample", "http://www.blackrock.com/1/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/1/role/FeesAndExpenses", "http://www.blackrock.com/1/role/InvestmentRisks", "http://www.blackrock.com/1/role/InvestmentStrategy", "http://www.blackrock.com/1/role/N1aSupplement", "http://www.blackrock.com/1/role/OperatingExpensesData", "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/1/role/RiskReturn", "http://www.blackrock.com/1/role/ShareholderFeesData", "http://www.blackrock.com/10/role/BarChartData", "http://www.blackrock.com/10/role/ExpenseExample", "http://www.blackrock.com/10/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/10/role/FeesAndExpenses", "http://www.blackrock.com/10/role/InvestmentRisks", "http://www.blackrock.com/10/role/InvestmentStrategy", "http://www.blackrock.com/10/role/N1aSupplement", "http://www.blackrock.com/10/role/OperatingExpensesData", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/10/role/RiskReturn", "http://www.blackrock.com/10/role/ShareholderFeesData", "http://www.blackrock.com/11/role/BarChartData", "http://www.blackrock.com/11/role/ExpenseExample", "http://www.blackrock.com/11/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/11/role/FeesAndExpenses", "http://www.blackrock.com/11/role/InvestmentRisks", "http://www.blackrock.com/11/role/InvestmentStrategy", "http://www.blackrock.com/11/role/N1aSupplement", "http://www.blackrock.com/11/role/OperatingExpensesData", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/11/role/RiskReturn", "http://www.blackrock.com/11/role/ShareholderFeesData", "http://www.blackrock.com/12/role/BarChartData", "http://www.blackrock.com/12/role/ExpenseExample", "http://www.blackrock.com/12/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/12/role/FeesAndExpenses", "http://www.blackrock.com/12/role/InvestmentRisks", "http://www.blackrock.com/12/role/InvestmentStrategy", "http://www.blackrock.com/12/role/N1aSupplement", "http://www.blackrock.com/12/role/OperatingExpensesData", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/12/role/RiskReturn", "http://www.blackrock.com/12/role/ShareholderFeesData", "http://www.blackrock.com/13/role/BarChartData", "http://www.blackrock.com/13/role/ExpenseExample", "http://www.blackrock.com/13/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/13/role/FeesAndExpenses", "http://www.blackrock.com/13/role/InvestmentRisks", "http://www.blackrock.com/13/role/InvestmentStrategy", "http://www.blackrock.com/13/role/N1aSupplement", "http://www.blackrock.com/13/role/OperatingExpensesData", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/13/role/RiskReturn", "http://www.blackrock.com/13/role/ShareholderFeesData", "http://www.blackrock.com/14/role/BarChartData", "http://www.blackrock.com/14/role/ExpenseExample", "http://www.blackrock.com/14/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/14/role/FeesAndExpenses", "http://www.blackrock.com/14/role/InvestmentRisks", "http://www.blackrock.com/14/role/InvestmentStrategy", "http://www.blackrock.com/14/role/N1aSupplement", "http://www.blackrock.com/14/role/OperatingExpensesData", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/14/role/RiskReturn", "http://www.blackrock.com/14/role/ShareholderFeesData", "http://www.blackrock.com/15/role/BarChartData", "http://www.blackrock.com/15/role/ExpenseExample", "http://www.blackrock.com/15/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/15/role/FeesAndExpenses", "http://www.blackrock.com/15/role/InvestmentRisks", "http://www.blackrock.com/15/role/InvestmentStrategy", "http://www.blackrock.com/15/role/N1aSupplement", "http://www.blackrock.com/15/role/OperatingExpensesData", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/15/role/RiskReturn", "http://www.blackrock.com/15/role/ShareholderFeesData", "http://www.blackrock.com/16/role/BarChartData", "http://www.blackrock.com/16/role/ExpenseExample", "http://www.blackrock.com/16/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/16/role/FeesAndExpenses", "http://www.blackrock.com/16/role/InvestmentRisks", "http://www.blackrock.com/16/role/InvestmentStrategy", "http://www.blackrock.com/16/role/N1aSupplement", "http://www.blackrock.com/16/role/OperatingExpensesData", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/16/role/RiskReturn", "http://www.blackrock.com/16/role/ShareholderFeesData", "http://www.blackrock.com/17/role/BarChartData", "http://www.blackrock.com/17/role/ExpenseExample", "http://www.blackrock.com/17/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/17/role/FeesAndExpenses", "http://www.blackrock.com/17/role/InvestmentRisks", "http://www.blackrock.com/17/role/InvestmentStrategy", "http://www.blackrock.com/17/role/N1aSupplement", "http://www.blackrock.com/17/role/OperatingExpensesData", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/17/role/RiskReturn", "http://www.blackrock.com/17/role/ShareholderFeesData", "http://www.blackrock.com/18/role/BarChartData", "http://www.blackrock.com/18/role/ExpenseExample", "http://www.blackrock.com/18/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/18/role/FeesAndExpenses", "http://www.blackrock.com/18/role/InvestmentRisks", "http://www.blackrock.com/18/role/InvestmentStrategy", "http://www.blackrock.com/18/role/N1aSupplement", "http://www.blackrock.com/18/role/OperatingExpensesData", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/18/role/RiskReturn", "http://www.blackrock.com/18/role/ShareholderFeesData", "http://www.blackrock.com/19/role/BarChartData", "http://www.blackrock.com/19/role/ExpenseExample", "http://www.blackrock.com/19/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/19/role/FeesAndExpenses", "http://www.blackrock.com/19/role/InvestmentRisks", "http://www.blackrock.com/19/role/InvestmentStrategy", "http://www.blackrock.com/19/role/N1aSupplement", "http://www.blackrock.com/19/role/OperatingExpensesData", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/19/role/RiskReturn", "http://www.blackrock.com/19/role/ShareholderFeesData", "http://www.blackrock.com/2/role/BarChartData", "http://www.blackrock.com/2/role/ExpenseExample", "http://www.blackrock.com/2/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/2/role/FeesAndExpenses", "http://www.blackrock.com/2/role/InvestmentRisks", "http://www.blackrock.com/2/role/InvestmentStrategy", "http://www.blackrock.com/2/role/N1aSupplement", "http://www.blackrock.com/2/role/OperatingExpensesData", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/2/role/RiskReturn", "http://www.blackrock.com/2/role/ShareholderFeesData", "http://www.blackrock.com/20/role/BarChartData", "http://www.blackrock.com/20/role/ExpenseExample", "http://www.blackrock.com/20/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/20/role/FeesAndExpenses", "http://www.blackrock.com/20/role/InvestmentRisks", "http://www.blackrock.com/20/role/InvestmentStrategy", "http://www.blackrock.com/20/role/N1aSupplement", "http://www.blackrock.com/20/role/OperatingExpensesData", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/20/role/RiskReturn", "http://www.blackrock.com/20/role/ShareholderFeesData", "http://www.blackrock.com/3/role/BarChartData", "http://www.blackrock.com/3/role/ExpenseExample", "http://www.blackrock.com/3/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/3/role/FeesAndExpenses", "http://www.blackrock.com/3/role/InvestmentRisks", "http://www.blackrock.com/3/role/InvestmentStrategy", "http://www.blackrock.com/3/role/N1aSupplement", "http://www.blackrock.com/3/role/OperatingExpensesData", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/3/role/RiskReturn", "http://www.blackrock.com/3/role/ShareholderFeesData", "http://www.blackrock.com/4/role/BarChartData", "http://www.blackrock.com/4/role/ExpenseExample", "http://www.blackrock.com/4/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/4/role/FeesAndExpenses", "http://www.blackrock.com/4/role/InvestmentRisks", "http://www.blackrock.com/4/role/InvestmentStrategy", "http://www.blackrock.com/4/role/N1aSupplement", "http://www.blackrock.com/4/role/OperatingExpensesData", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/4/role/RiskReturn", "http://www.blackrock.com/4/role/ShareholderFeesData", "http://www.blackrock.com/5/role/BarChartData", "http://www.blackrock.com/5/role/ExpenseExample", "http://www.blackrock.com/5/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/5/role/FeesAndExpenses", "http://www.blackrock.com/5/role/InvestmentRisks", "http://www.blackrock.com/5/role/InvestmentStrategy", "http://www.blackrock.com/5/role/N1aSupplement", "http://www.blackrock.com/5/role/OperatingExpensesData", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/5/role/RiskReturn", "http://www.blackrock.com/5/role/ShareholderFeesData", "http://www.blackrock.com/6/role/BarChartData", "http://www.blackrock.com/6/role/ExpenseExample", "http://www.blackrock.com/6/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/6/role/FeesAndExpenses", "http://www.blackrock.com/6/role/InvestmentRisks", "http://www.blackrock.com/6/role/InvestmentStrategy", "http://www.blackrock.com/6/role/N1aSupplement", "http://www.blackrock.com/6/role/OperatingExpensesData", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/6/role/RiskReturn", "http://www.blackrock.com/6/role/ShareholderFeesData", "http://www.blackrock.com/7/role/BarChartData", "http://www.blackrock.com/7/role/ExpenseExample", "http://www.blackrock.com/7/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/7/role/FeesAndExpenses", "http://www.blackrock.com/7/role/InvestmentRisks", "http://www.blackrock.com/7/role/InvestmentStrategy", "http://www.blackrock.com/7/role/N1aSupplement", "http://www.blackrock.com/7/role/OperatingExpensesData", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/7/role/RiskReturn", "http://www.blackrock.com/7/role/ShareholderFeesData", "http://www.blackrock.com/8/role/BarChartData", "http://www.blackrock.com/8/role/ExpenseExample", "http://www.blackrock.com/8/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/8/role/FeesAndExpenses", "http://www.blackrock.com/8/role/InvestmentRisks", "http://www.blackrock.com/8/role/InvestmentStrategy", "http://www.blackrock.com/8/role/N1aSupplement", "http://www.blackrock.com/8/role/OperatingExpensesData", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/8/role/RiskReturn", "http://www.blackrock.com/8/role/ShareholderFeesData", "http://www.blackrock.com/9/role/BarChartData", "http://www.blackrock.com/9/role/ExpenseExample", "http://www.blackrock.com/9/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/9/role/FeesAndExpenses", "http://www.blackrock.com/9/role/InvestmentRisks", "http://www.blackrock.com/9/role/InvestmentStrategy", "http://www.blackrock.com/9/role/N1aSupplement", "http://www.blackrock.com/9/role/OperatingExpensesData", "http://www.blackrock.com/9/role/PerformanceManagement", "http://www.blackrock.com/9/role/RiskReturn", "http://www.blackrock.com/9/role/ShareholderFeesData", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/InvestmentRisks", "http://xbrl.sec.gov/rr/role/InvestmentStrategy", "http://xbrl.sec.gov/rr/role/N1aSupplement", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/RiskReturn", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "Series", "documentation": "All the names of the entities being reported upon in a document. Any legal structure used to conduct activities or to hold assets. Some examples of such structures are corporations, partnerships, limited liability companies, grantor trusts, and other trusts. This item does not include business and geographical segments which are included in the geographical or business segments domains." } } }, "auth_ref": [] }, "dei_EntityInvCompanyType": { "xbrltype": "invCompanyType", "nsuri": "http://xbrl.sec.gov/dei/2025", "localname": "EntityInvCompanyType", "presentation": [ "http://www.blackrock.com/1/role/N1aCover", "http://www.blackrock.com/10/role/N1aCover", "http://www.blackrock.com/11/role/N1aCover", "http://www.blackrock.com/12/role/N1aCover", "http://www.blackrock.com/13/role/N1aCover", "http://www.blackrock.com/14/role/N1aCover", "http://www.blackrock.com/15/role/N1aCover", "http://www.blackrock.com/16/role/N1aCover", "http://www.blackrock.com/17/role/N1aCover", "http://www.blackrock.com/18/role/N1aCover", "http://www.blackrock.com/19/role/N1aCover", "http://www.blackrock.com/2/role/N1aCover", "http://www.blackrock.com/20/role/N1aCover", "http://www.blackrock.com/3/role/N1aCover", "http://www.blackrock.com/4/role/N1aCover", "http://www.blackrock.com/5/role/N1aCover", "http://www.blackrock.com/6/role/N1aCover", "http://www.blackrock.com/7/role/N1aCover", "http://www.blackrock.com/8/role/N1aCover", "http://www.blackrock.com/9/role/N1aCover", "http://xbrl.sec.gov/rr/role/N1aCover" ], "lang": { "en-us": { "role": { "label": "Entity Investment Company Type", "documentation": "One of: N-1A (Mutual Fund), N-1 (Open-End Separate Account with No Variable Annuities), N-2 (Closed-End Investment Company), N-3 (Separate Account Registered as Open-End Management Investment Company), N-4 (Variable Annuity UIT Separate Account), N-5 (Small Business Investment Company), N-6 (Variable Life UIT Separate Account), S-1 or S-3 (Face Amount Certificate Company), S-6 (UIT, Non-Insurance Product)." } } }, "auth_ref": [ "r59" ] }, "dei_EntityRegistrantName": { "xbrltype": "normalizedStringItemType", "nsuri": "http://xbrl.sec.gov/dei/2025", "localname": "EntityRegistrantName", "presentation": [ "http://www.blackrock.com/1/role/N1aCover", "http://www.blackrock.com/10/role/N1aCover", "http://www.blackrock.com/11/role/N1aCover", "http://www.blackrock.com/12/role/N1aCover", "http://www.blackrock.com/13/role/N1aCover", "http://www.blackrock.com/14/role/N1aCover", "http://www.blackrock.com/15/role/N1aCover", "http://www.blackrock.com/16/role/N1aCover", "http://www.blackrock.com/17/role/N1aCover", "http://www.blackrock.com/18/role/N1aCover", "http://www.blackrock.com/19/role/N1aCover", "http://www.blackrock.com/2/role/N1aCover", "http://www.blackrock.com/20/role/N1aCover", "http://www.blackrock.com/3/role/N1aCover", "http://www.blackrock.com/4/role/N1aCover", "http://www.blackrock.com/5/role/N1aCover", "http://www.blackrock.com/6/role/N1aCover", "http://www.blackrock.com/7/role/N1aCover", "http://www.blackrock.com/8/role/N1aCover", "http://www.blackrock.com/9/role/N1aCover", "http://xbrl.sec.gov/rr/role/N1aCover" ], "lang": { "en-us": { "role": { "label": "Registrant Name", "documentation": "The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC." } } }, "auth_ref": [ "r0" ] }, "bf3_EquitySecuritiesRiskMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "EquitySecuritiesRiskMember", "presentation": [ "http://www.blackrock.com/1/role/InvestmentRisks", "http://www.blackrock.com/10/role/InvestmentRisks", "http://www.blackrock.com/11/role/InvestmentRisks", "http://www.blackrock.com/12/role/InvestmentRisks", "http://www.blackrock.com/13/role/InvestmentRisks", "http://www.blackrock.com/14/role/InvestmentRisks", "http://www.blackrock.com/15/role/InvestmentRisks", "http://www.blackrock.com/16/role/InvestmentRisks", "http://www.blackrock.com/17/role/InvestmentRisks", "http://www.blackrock.com/18/role/InvestmentRisks", "http://www.blackrock.com/19/role/InvestmentRisks", "http://www.blackrock.com/2/role/InvestmentRisks", "http://www.blackrock.com/20/role/InvestmentRisks", "http://www.blackrock.com/3/role/InvestmentRisks", "http://www.blackrock.com/4/role/InvestmentRisks", "http://www.blackrock.com/5/role/InvestmentRisks", "http://www.blackrock.com/6/role/InvestmentRisks", "http://www.blackrock.com/7/role/InvestmentRisks", "http://www.blackrock.com/8/role/InvestmentRisks", "http://www.blackrock.com/9/role/InvestmentRisks" ], "lang": { "en-us": { "role": { "label": "Equity Securities Risk [Member]" } } }, "auth_ref": [] }, "oef_ExchangeFee": { "xbrltype": "nonNegativeMonetaryItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExchangeFee", "presentation": [ "http://www.blackrock.com/1/role/ShareholderFeesData", "http://www.blackrock.com/10/role/ShareholderFeesData", "http://www.blackrock.com/11/role/ShareholderFeesData", "http://www.blackrock.com/12/role/ShareholderFeesData", "http://www.blackrock.com/13/role/ShareholderFeesData", "http://www.blackrock.com/14/role/ShareholderFeesData", "http://www.blackrock.com/15/role/ShareholderFeesData", "http://www.blackrock.com/16/role/ShareholderFeesData", "http://www.blackrock.com/17/role/ShareholderFeesData", "http://www.blackrock.com/18/role/ShareholderFeesData", "http://www.blackrock.com/19/role/ShareholderFeesData", "http://www.blackrock.com/2/role/ShareholderFeesData", "http://www.blackrock.com/20/role/ShareholderFeesData", "http://www.blackrock.com/3/role/ShareholderFeesData", "http://www.blackrock.com/4/role/ShareholderFeesData", "http://www.blackrock.com/5/role/ShareholderFeesData", "http://www.blackrock.com/6/role/ShareholderFeesData", "http://www.blackrock.com/7/role/ShareholderFeesData", "http://www.blackrock.com/8/role/ShareholderFeesData", "http://www.blackrock.com/9/role/ShareholderFeesData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "Exchange Fee" } } }, "auth_ref": [ "r13" ] }, "oef_ExchangeFeeOverRedemption": { "xbrltype": "nonNegativePure4ItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExchangeFeeOverRedemption", "presentation": [ "http://www.blackrock.com/1/role/ShareholderFeesData", "http://www.blackrock.com/10/role/ShareholderFeesData", "http://www.blackrock.com/11/role/ShareholderFeesData", "http://www.blackrock.com/12/role/ShareholderFeesData", "http://www.blackrock.com/13/role/ShareholderFeesData", "http://www.blackrock.com/14/role/ShareholderFeesData", "http://www.blackrock.com/15/role/ShareholderFeesData", "http://www.blackrock.com/16/role/ShareholderFeesData", "http://www.blackrock.com/17/role/ShareholderFeesData", "http://www.blackrock.com/18/role/ShareholderFeesData", "http://www.blackrock.com/19/role/ShareholderFeesData", "http://www.blackrock.com/2/role/ShareholderFeesData", "http://www.blackrock.com/20/role/ShareholderFeesData", "http://www.blackrock.com/3/role/ShareholderFeesData", "http://www.blackrock.com/4/role/ShareholderFeesData", "http://www.blackrock.com/5/role/ShareholderFeesData", "http://www.blackrock.com/6/role/ShareholderFeesData", "http://www.blackrock.com/7/role/ShareholderFeesData", "http://www.blackrock.com/8/role/ShareholderFeesData", "http://www.blackrock.com/9/role/ShareholderFeesData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "Exchange Fee (as a percentage of Amount Redeemed)" } } }, "auth_ref": [ "r13" ] }, "oef_ExpenseBreakpointDiscounts": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpenseBreakpointDiscounts", "presentation": [ "http://www.blackrock.com/1/role/FeesAndExpenses", "http://www.blackrock.com/10/role/FeesAndExpenses", "http://www.blackrock.com/11/role/FeesAndExpenses", "http://www.blackrock.com/12/role/FeesAndExpenses", "http://www.blackrock.com/13/role/FeesAndExpenses", "http://www.blackrock.com/14/role/FeesAndExpenses", "http://www.blackrock.com/15/role/FeesAndExpenses", "http://www.blackrock.com/16/role/FeesAndExpenses", "http://www.blackrock.com/17/role/FeesAndExpenses", "http://www.blackrock.com/18/role/FeesAndExpenses", "http://www.blackrock.com/19/role/FeesAndExpenses", "http://www.blackrock.com/2/role/FeesAndExpenses", "http://www.blackrock.com/20/role/FeesAndExpenses", "http://www.blackrock.com/3/role/FeesAndExpenses", "http://www.blackrock.com/4/role/FeesAndExpenses", "http://www.blackrock.com/5/role/FeesAndExpenses", "http://www.blackrock.com/6/role/FeesAndExpenses", "http://www.blackrock.com/7/role/FeesAndExpenses", "http://www.blackrock.com/8/role/FeesAndExpenses", "http://www.blackrock.com/9/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/FeesAndExpenses" ], "lang": { "en-us": { "role": { "label": "Expense Breakpoint Discounts [Text]" } } }, "auth_ref": [ "r25" ] }, "oef_ExpenseBreakpointMinimumInvestmentRequiredAmount": { "xbrltype": "monetaryItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpenseBreakpointMinimumInvestmentRequiredAmount", "presentation": [ "http://www.blackrock.com/1/role/FeesAndExpenses", "http://www.blackrock.com/10/role/FeesAndExpenses", "http://www.blackrock.com/11/role/FeesAndExpenses", "http://www.blackrock.com/12/role/FeesAndExpenses", "http://www.blackrock.com/13/role/FeesAndExpenses", "http://www.blackrock.com/14/role/FeesAndExpenses", "http://www.blackrock.com/15/role/FeesAndExpenses", "http://www.blackrock.com/16/role/FeesAndExpenses", "http://www.blackrock.com/17/role/FeesAndExpenses", "http://www.blackrock.com/18/role/FeesAndExpenses", "http://www.blackrock.com/19/role/FeesAndExpenses", "http://www.blackrock.com/2/role/FeesAndExpenses", "http://www.blackrock.com/20/role/FeesAndExpenses", "http://www.blackrock.com/3/role/FeesAndExpenses", "http://www.blackrock.com/4/role/FeesAndExpenses", "http://www.blackrock.com/5/role/FeesAndExpenses", "http://www.blackrock.com/6/role/FeesAndExpenses", "http://www.blackrock.com/7/role/FeesAndExpenses", "http://www.blackrock.com/8/role/FeesAndExpenses", "http://www.blackrock.com/9/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/FeesAndExpenses" ], "lang": { "en-us": { "role": { "label": "Expense Breakpoint, Minimum Investment Required [Amount]" } } }, "auth_ref": [ "r12" ] }, "oef_ExpenseExampleAbstract": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpenseExampleAbstract", "lang": { "en-us": { "role": { "label": "Expense Example:" } } }, "auth_ref": [ "r30" ] }, "oef_ExpenseExampleByYearCaption": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpenseExampleByYearCaption", "presentation": [ "http://www.blackrock.com/1/role/FeesAndExpenses", "http://www.blackrock.com/10/role/FeesAndExpenses", "http://www.blackrock.com/11/role/FeesAndExpenses", "http://www.blackrock.com/12/role/FeesAndExpenses", "http://www.blackrock.com/13/role/FeesAndExpenses", "http://www.blackrock.com/14/role/FeesAndExpenses", "http://www.blackrock.com/15/role/FeesAndExpenses", "http://www.blackrock.com/16/role/FeesAndExpenses", "http://www.blackrock.com/17/role/FeesAndExpenses", "http://www.blackrock.com/18/role/FeesAndExpenses", "http://www.blackrock.com/19/role/FeesAndExpenses", "http://www.blackrock.com/2/role/FeesAndExpenses", "http://www.blackrock.com/20/role/FeesAndExpenses", "http://www.blackrock.com/3/role/FeesAndExpenses", "http://www.blackrock.com/4/role/FeesAndExpenses", "http://www.blackrock.com/5/role/FeesAndExpenses", "http://www.blackrock.com/6/role/FeesAndExpenses", "http://www.blackrock.com/7/role/FeesAndExpenses", "http://www.blackrock.com/8/role/FeesAndExpenses", "http://www.blackrock.com/9/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/FeesAndExpenses" ], "lang": { "en-us": { "role": { "label": "Expense Example by, Year, Caption [Text]" } } }, "auth_ref": [ "r30" ] }, "oef_ExpenseExampleByYearColumnName": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpenseExampleByYearColumnName", "presentation": [ "http://www.blackrock.com/1/role/ExpenseExample", "http://www.blackrock.com/10/role/ExpenseExample", "http://www.blackrock.com/11/role/ExpenseExample", "http://www.blackrock.com/12/role/ExpenseExample", "http://www.blackrock.com/13/role/ExpenseExample", "http://www.blackrock.com/14/role/ExpenseExample", "http://www.blackrock.com/15/role/ExpenseExample", "http://www.blackrock.com/16/role/ExpenseExample", "http://www.blackrock.com/17/role/ExpenseExample", "http://www.blackrock.com/18/role/ExpenseExample", "http://www.blackrock.com/19/role/ExpenseExample", "http://www.blackrock.com/2/role/ExpenseExample", "http://www.blackrock.com/20/role/ExpenseExample", "http://www.blackrock.com/3/role/ExpenseExample", "http://www.blackrock.com/4/role/ExpenseExample", "http://www.blackrock.com/5/role/ExpenseExample", "http://www.blackrock.com/6/role/ExpenseExample", "http://www.blackrock.com/7/role/ExpenseExample", "http://www.blackrock.com/8/role/ExpenseExample", "http://www.blackrock.com/9/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExample" ], "lang": { "en-us": { "role": { "label": "Expense Example, By Year, Column [Optional Text]" } } }, "auth_ref": [ "r30" ] }, "oef_ExpenseExampleByYearHeading": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpenseExampleByYearHeading", "presentation": [ "http://www.blackrock.com/1/role/FeesAndExpenses", "http://www.blackrock.com/10/role/FeesAndExpenses", "http://www.blackrock.com/11/role/FeesAndExpenses", "http://www.blackrock.com/12/role/FeesAndExpenses", "http://www.blackrock.com/13/role/FeesAndExpenses", "http://www.blackrock.com/14/role/FeesAndExpenses", "http://www.blackrock.com/15/role/FeesAndExpenses", "http://www.blackrock.com/16/role/FeesAndExpenses", "http://www.blackrock.com/17/role/FeesAndExpenses", "http://www.blackrock.com/18/role/FeesAndExpenses", "http://www.blackrock.com/19/role/FeesAndExpenses", "http://www.blackrock.com/2/role/FeesAndExpenses", "http://www.blackrock.com/20/role/FeesAndExpenses", "http://www.blackrock.com/3/role/FeesAndExpenses", "http://www.blackrock.com/4/role/FeesAndExpenses", "http://www.blackrock.com/5/role/FeesAndExpenses", "http://www.blackrock.com/6/role/FeesAndExpenses", "http://www.blackrock.com/7/role/FeesAndExpenses", "http://www.blackrock.com/8/role/FeesAndExpenses", "http://www.blackrock.com/9/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/FeesAndExpenses" ], "lang": { "en-us": { "role": { "label": "Expense Example by Year [Heading]" } } }, "auth_ref": [ "r30" ] }, "oef_ExpenseExampleClosingTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpenseExampleClosingTextBlock", "presentation": [ "http://www.blackrock.com/1/role/FeesAndExpenses", "http://www.blackrock.com/10/role/FeesAndExpenses", "http://www.blackrock.com/11/role/FeesAndExpenses", "http://www.blackrock.com/12/role/FeesAndExpenses", "http://www.blackrock.com/13/role/FeesAndExpenses", "http://www.blackrock.com/14/role/FeesAndExpenses", "http://www.blackrock.com/15/role/FeesAndExpenses", "http://www.blackrock.com/16/role/FeesAndExpenses", "http://www.blackrock.com/17/role/FeesAndExpenses", "http://www.blackrock.com/18/role/FeesAndExpenses", "http://www.blackrock.com/19/role/FeesAndExpenses", "http://www.blackrock.com/2/role/FeesAndExpenses", "http://www.blackrock.com/20/role/FeesAndExpenses", "http://www.blackrock.com/3/role/FeesAndExpenses", "http://www.blackrock.com/4/role/FeesAndExpenses", "http://www.blackrock.com/5/role/FeesAndExpenses", "http://www.blackrock.com/6/role/FeesAndExpenses", "http://www.blackrock.com/7/role/FeesAndExpenses", "http://www.blackrock.com/8/role/FeesAndExpenses", "http://www.blackrock.com/9/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/FeesAndExpenses" ], "lang": { "en-us": { "role": { "label": "Expense Example Closing [Text Block]" } } }, "auth_ref": [ "r30" ] }, "oef_ExpenseExampleFootnotesTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpenseExampleFootnotesTextBlock", "presentation": [ "http://www.blackrock.com/1/role/FeesAndExpenses", "http://www.blackrock.com/10/role/FeesAndExpenses", "http://www.blackrock.com/11/role/FeesAndExpenses", "http://www.blackrock.com/12/role/FeesAndExpenses", "http://www.blackrock.com/13/role/FeesAndExpenses", "http://www.blackrock.com/14/role/FeesAndExpenses", "http://www.blackrock.com/15/role/FeesAndExpenses", "http://www.blackrock.com/16/role/FeesAndExpenses", "http://www.blackrock.com/17/role/FeesAndExpenses", "http://www.blackrock.com/18/role/FeesAndExpenses", "http://www.blackrock.com/19/role/FeesAndExpenses", "http://www.blackrock.com/2/role/FeesAndExpenses", "http://www.blackrock.com/20/role/FeesAndExpenses", "http://www.blackrock.com/3/role/FeesAndExpenses", "http://www.blackrock.com/4/role/FeesAndExpenses", "http://www.blackrock.com/5/role/FeesAndExpenses", "http://www.blackrock.com/6/role/FeesAndExpenses", "http://www.blackrock.com/7/role/FeesAndExpenses", "http://www.blackrock.com/8/role/FeesAndExpenses", "http://www.blackrock.com/9/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/FeesAndExpenses" ], "lang": { "en-us": { "role": { "label": "Expense Example Footnotes [Text Block]" } } }, "auth_ref": [ "r30" ] }, "oef_ExpenseExampleHeading": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpenseExampleHeading", "presentation": [ "http://www.blackrock.com/1/role/FeesAndExpenses", "http://www.blackrock.com/10/role/FeesAndExpenses", "http://www.blackrock.com/11/role/FeesAndExpenses", "http://www.blackrock.com/12/role/FeesAndExpenses", "http://www.blackrock.com/13/role/FeesAndExpenses", "http://www.blackrock.com/14/role/FeesAndExpenses", "http://www.blackrock.com/15/role/FeesAndExpenses", "http://www.blackrock.com/16/role/FeesAndExpenses", "http://www.blackrock.com/17/role/FeesAndExpenses", "http://www.blackrock.com/18/role/FeesAndExpenses", "http://www.blackrock.com/19/role/FeesAndExpenses", "http://www.blackrock.com/2/role/FeesAndExpenses", "http://www.blackrock.com/20/role/FeesAndExpenses", "http://www.blackrock.com/3/role/FeesAndExpenses", "http://www.blackrock.com/4/role/FeesAndExpenses", "http://www.blackrock.com/5/role/FeesAndExpenses", "http://www.blackrock.com/6/role/FeesAndExpenses", "http://www.blackrock.com/7/role/FeesAndExpenses", "http://www.blackrock.com/8/role/FeesAndExpenses", "http://www.blackrock.com/9/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/FeesAndExpenses" ], "lang": { "en-us": { "role": { "label": "Expense Example [Heading]" } } }, "auth_ref": [ "r30" ] }, "oef_ExpenseExampleNarrativeTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpenseExampleNarrativeTextBlock", "presentation": [ "http://www.blackrock.com/1/role/FeesAndExpenses", "http://www.blackrock.com/10/role/FeesAndExpenses", "http://www.blackrock.com/11/role/FeesAndExpenses", "http://www.blackrock.com/12/role/FeesAndExpenses", "http://www.blackrock.com/13/role/FeesAndExpenses", "http://www.blackrock.com/14/role/FeesAndExpenses", "http://www.blackrock.com/15/role/FeesAndExpenses", "http://www.blackrock.com/16/role/FeesAndExpenses", "http://www.blackrock.com/17/role/FeesAndExpenses", "http://www.blackrock.com/18/role/FeesAndExpenses", "http://www.blackrock.com/19/role/FeesAndExpenses", "http://www.blackrock.com/2/role/FeesAndExpenses", "http://www.blackrock.com/20/role/FeesAndExpenses", "http://www.blackrock.com/3/role/FeesAndExpenses", "http://www.blackrock.com/4/role/FeesAndExpenses", "http://www.blackrock.com/5/role/FeesAndExpenses", "http://www.blackrock.com/6/role/FeesAndExpenses", "http://www.blackrock.com/7/role/FeesAndExpenses", "http://www.blackrock.com/8/role/FeesAndExpenses", "http://www.blackrock.com/9/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/FeesAndExpenses" ], "lang": { "en-us": { "role": { "label": "Expense Example Narrative [Text Block]" } } }, "auth_ref": [ "r30" ] }, "oef_ExpenseExampleNoRedemptionAbstract": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpenseExampleNoRedemptionAbstract", "lang": { "en-us": { "role": { "label": "Expense Example, No Redemption:" } } }, "auth_ref": [ "r31" ] }, "oef_ExpenseExampleNoRedemptionByYearCaption": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpenseExampleNoRedemptionByYearCaption", "presentation": [ "http://www.blackrock.com/1/role/FeesAndExpenses", "http://www.blackrock.com/10/role/FeesAndExpenses", "http://www.blackrock.com/11/role/FeesAndExpenses", "http://www.blackrock.com/12/role/FeesAndExpenses", "http://www.blackrock.com/13/role/FeesAndExpenses", "http://www.blackrock.com/14/role/FeesAndExpenses", "http://www.blackrock.com/15/role/FeesAndExpenses", "http://www.blackrock.com/16/role/FeesAndExpenses", "http://www.blackrock.com/17/role/FeesAndExpenses", "http://www.blackrock.com/18/role/FeesAndExpenses", "http://www.blackrock.com/19/role/FeesAndExpenses", "http://www.blackrock.com/2/role/FeesAndExpenses", "http://www.blackrock.com/20/role/FeesAndExpenses", "http://www.blackrock.com/3/role/FeesAndExpenses", "http://www.blackrock.com/4/role/FeesAndExpenses", "http://www.blackrock.com/5/role/FeesAndExpenses", "http://www.blackrock.com/6/role/FeesAndExpenses", "http://www.blackrock.com/7/role/FeesAndExpenses", "http://www.blackrock.com/8/role/FeesAndExpenses", "http://www.blackrock.com/9/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/FeesAndExpenses" ], "lang": { "en-us": { "role": { "label": "Expense Example, No Redemption, By Year, Caption [Text]" } } }, "auth_ref": [ "r31" ] }, "oef_ExpenseExampleNoRedemptionByYearColumnName": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpenseExampleNoRedemptionByYearColumnName", "presentation": [ "http://www.blackrock.com/1/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/10/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/11/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/12/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/13/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/14/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/15/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/16/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/17/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/18/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/19/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/2/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/20/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/3/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/4/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/5/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/6/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/7/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/8/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/9/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption" ], "lang": { "en-us": { "role": { "label": "Expense Example, No Redemption, By Year, Column [Optional Text]" } } }, "auth_ref": [ "r31" ] }, "oef_ExpenseExampleNoRedemptionNarrativeTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpenseExampleNoRedemptionNarrativeTextBlock", "presentation": [ "http://www.blackrock.com/1/role/FeesAndExpenses", "http://www.blackrock.com/10/role/FeesAndExpenses", "http://www.blackrock.com/11/role/FeesAndExpenses", "http://www.blackrock.com/12/role/FeesAndExpenses", "http://www.blackrock.com/13/role/FeesAndExpenses", "http://www.blackrock.com/14/role/FeesAndExpenses", "http://www.blackrock.com/15/role/FeesAndExpenses", "http://www.blackrock.com/16/role/FeesAndExpenses", "http://www.blackrock.com/17/role/FeesAndExpenses", "http://www.blackrock.com/18/role/FeesAndExpenses", "http://www.blackrock.com/19/role/FeesAndExpenses", "http://www.blackrock.com/2/role/FeesAndExpenses", "http://www.blackrock.com/20/role/FeesAndExpenses", "http://www.blackrock.com/3/role/FeesAndExpenses", "http://www.blackrock.com/4/role/FeesAndExpenses", "http://www.blackrock.com/5/role/FeesAndExpenses", "http://www.blackrock.com/6/role/FeesAndExpenses", "http://www.blackrock.com/7/role/FeesAndExpenses", "http://www.blackrock.com/8/role/FeesAndExpenses", "http://www.blackrock.com/9/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/FeesAndExpenses" ], "lang": { "en-us": { "role": { "label": "Expense Example, No Redemption Narrative [Text Block]" } } }, "auth_ref": [ "r31" ] }, "oef_ExpenseExampleNoRedemptionTableTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpenseExampleNoRedemptionTableTextBlock", "presentation": [ "http://www.blackrock.com/1/role/FeesAndExpenses", "http://www.blackrock.com/10/role/FeesAndExpenses", "http://www.blackrock.com/11/role/FeesAndExpenses", "http://www.blackrock.com/12/role/FeesAndExpenses", "http://www.blackrock.com/13/role/FeesAndExpenses", "http://www.blackrock.com/14/role/FeesAndExpenses", "http://www.blackrock.com/15/role/FeesAndExpenses", "http://www.blackrock.com/16/role/FeesAndExpenses", "http://www.blackrock.com/17/role/FeesAndExpenses", "http://www.blackrock.com/18/role/FeesAndExpenses", "http://www.blackrock.com/19/role/FeesAndExpenses", "http://www.blackrock.com/2/role/FeesAndExpenses", "http://www.blackrock.com/20/role/FeesAndExpenses", "http://www.blackrock.com/3/role/FeesAndExpenses", "http://www.blackrock.com/4/role/FeesAndExpenses", "http://www.blackrock.com/5/role/FeesAndExpenses", "http://www.blackrock.com/6/role/FeesAndExpenses", "http://www.blackrock.com/7/role/FeesAndExpenses", "http://www.blackrock.com/8/role/FeesAndExpenses", "http://www.blackrock.com/9/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/FeesAndExpenses" ], "lang": { "en-us": { "role": { "label": "Expense Example, No Redemption [Table]" } } }, "auth_ref": [ "r31" ] }, "oef_ExpenseExampleNoRedemptionYear01": { "xbrltype": "nonNegativeMonetaryItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpenseExampleNoRedemptionYear01", "presentation": [ "http://www.blackrock.com/1/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/10/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/11/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/12/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/13/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/14/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/15/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/16/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/17/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/18/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/19/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/2/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/20/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/3/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/4/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/5/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/6/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/7/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/8/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/9/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption" ], "lang": { "en-us": { "role": { "label": "Expense Example, No Redemption, 1 Year" } } }, "auth_ref": [ "r31" ] }, "oef_ExpenseExampleNoRedemptionYear03": { "xbrltype": "nonNegativeMonetaryItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpenseExampleNoRedemptionYear03", "presentation": [ "http://www.blackrock.com/1/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/10/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/11/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/12/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/13/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/14/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/15/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/16/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/17/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/18/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/19/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/2/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/20/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/3/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/4/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/5/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/6/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/7/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/8/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/9/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption" ], "lang": { "en-us": { "role": { "label": "Expense Example, No Redemption, 3 Years" } } }, "auth_ref": [ "r31" ] }, "oef_ExpenseExampleNoRedemptionYear05": { "xbrltype": "nonNegativeMonetaryItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpenseExampleNoRedemptionYear05", "presentation": [ "http://www.blackrock.com/1/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/10/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/11/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/12/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/13/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/14/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/15/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/16/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/17/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/18/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/19/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/2/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/20/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/3/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/4/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/5/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/6/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/7/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/8/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/9/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption" ], "lang": { "en-us": { "role": { "label": "Expense Example, No Redemption, 5 Years" } } }, "auth_ref": [ "r31" ] }, "oef_ExpenseExampleNoRedemptionYear10": { "xbrltype": "nonNegativeMonetaryItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpenseExampleNoRedemptionYear10", "presentation": [ "http://www.blackrock.com/1/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/10/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/11/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/12/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/13/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/14/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/15/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/16/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/17/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/18/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/19/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/2/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/20/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/3/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/4/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/5/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/6/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/7/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/8/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/9/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption" ], "lang": { "en-us": { "role": { "label": "Expense Example, No Redemption, 10 Years" } } }, "auth_ref": [ "r31" ] }, "oef_ExpenseExampleWithRedemptionTableTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpenseExampleWithRedemptionTableTextBlock", "presentation": [ "http://www.blackrock.com/1/role/FeesAndExpenses", "http://www.blackrock.com/10/role/FeesAndExpenses", "http://www.blackrock.com/11/role/FeesAndExpenses", "http://www.blackrock.com/12/role/FeesAndExpenses", "http://www.blackrock.com/13/role/FeesAndExpenses", "http://www.blackrock.com/14/role/FeesAndExpenses", "http://www.blackrock.com/15/role/FeesAndExpenses", "http://www.blackrock.com/16/role/FeesAndExpenses", "http://www.blackrock.com/17/role/FeesAndExpenses", "http://www.blackrock.com/18/role/FeesAndExpenses", "http://www.blackrock.com/19/role/FeesAndExpenses", "http://www.blackrock.com/2/role/FeesAndExpenses", "http://www.blackrock.com/20/role/FeesAndExpenses", "http://www.blackrock.com/3/role/FeesAndExpenses", "http://www.blackrock.com/4/role/FeesAndExpenses", "http://www.blackrock.com/5/role/FeesAndExpenses", "http://www.blackrock.com/6/role/FeesAndExpenses", "http://www.blackrock.com/7/role/FeesAndExpenses", "http://www.blackrock.com/8/role/FeesAndExpenses", "http://www.blackrock.com/9/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/FeesAndExpenses" ], "lang": { "en-us": { "role": { "label": "Expense Example, With Redemption [Table]" } } }, "auth_ref": [ "r30" ] }, "oef_ExpenseExampleYear01": { "xbrltype": "nonNegativeMonetaryItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpenseExampleYear01", "presentation": [ "http://www.blackrock.com/1/role/ExpenseExample", "http://www.blackrock.com/10/role/ExpenseExample", "http://www.blackrock.com/11/role/ExpenseExample", "http://www.blackrock.com/12/role/ExpenseExample", "http://www.blackrock.com/13/role/ExpenseExample", "http://www.blackrock.com/14/role/ExpenseExample", "http://www.blackrock.com/15/role/ExpenseExample", "http://www.blackrock.com/16/role/ExpenseExample", "http://www.blackrock.com/17/role/ExpenseExample", "http://www.blackrock.com/18/role/ExpenseExample", "http://www.blackrock.com/19/role/ExpenseExample", "http://www.blackrock.com/2/role/ExpenseExample", "http://www.blackrock.com/20/role/ExpenseExample", "http://www.blackrock.com/3/role/ExpenseExample", "http://www.blackrock.com/4/role/ExpenseExample", "http://www.blackrock.com/5/role/ExpenseExample", "http://www.blackrock.com/6/role/ExpenseExample", "http://www.blackrock.com/7/role/ExpenseExample", "http://www.blackrock.com/8/role/ExpenseExample", "http://www.blackrock.com/9/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExample" ], "lang": { "en-us": { "role": { "label": "Expense Example, with Redemption, 1 Year" } } }, "auth_ref": [ "r30" ] }, "oef_ExpenseExampleYear03": { "xbrltype": "nonNegativeMonetaryItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpenseExampleYear03", "presentation": [ "http://www.blackrock.com/1/role/ExpenseExample", "http://www.blackrock.com/10/role/ExpenseExample", "http://www.blackrock.com/11/role/ExpenseExample", "http://www.blackrock.com/12/role/ExpenseExample", "http://www.blackrock.com/13/role/ExpenseExample", "http://www.blackrock.com/14/role/ExpenseExample", "http://www.blackrock.com/15/role/ExpenseExample", "http://www.blackrock.com/16/role/ExpenseExample", "http://www.blackrock.com/17/role/ExpenseExample", "http://www.blackrock.com/18/role/ExpenseExample", "http://www.blackrock.com/19/role/ExpenseExample", "http://www.blackrock.com/2/role/ExpenseExample", "http://www.blackrock.com/20/role/ExpenseExample", "http://www.blackrock.com/3/role/ExpenseExample", "http://www.blackrock.com/4/role/ExpenseExample", "http://www.blackrock.com/5/role/ExpenseExample", "http://www.blackrock.com/6/role/ExpenseExample", "http://www.blackrock.com/7/role/ExpenseExample", "http://www.blackrock.com/8/role/ExpenseExample", "http://www.blackrock.com/9/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExample" ], "lang": { "en-us": { "role": { "label": "Expense Example, with Redemption, 3 Years" } } }, "auth_ref": [ "r30" ] }, "oef_ExpenseExampleYear05": { "xbrltype": "nonNegativeMonetaryItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpenseExampleYear05", "presentation": [ "http://www.blackrock.com/1/role/ExpenseExample", "http://www.blackrock.com/10/role/ExpenseExample", "http://www.blackrock.com/11/role/ExpenseExample", "http://www.blackrock.com/12/role/ExpenseExample", "http://www.blackrock.com/13/role/ExpenseExample", "http://www.blackrock.com/14/role/ExpenseExample", "http://www.blackrock.com/15/role/ExpenseExample", "http://www.blackrock.com/16/role/ExpenseExample", "http://www.blackrock.com/17/role/ExpenseExample", "http://www.blackrock.com/18/role/ExpenseExample", "http://www.blackrock.com/19/role/ExpenseExample", "http://www.blackrock.com/2/role/ExpenseExample", "http://www.blackrock.com/20/role/ExpenseExample", "http://www.blackrock.com/3/role/ExpenseExample", "http://www.blackrock.com/4/role/ExpenseExample", "http://www.blackrock.com/5/role/ExpenseExample", "http://www.blackrock.com/6/role/ExpenseExample", "http://www.blackrock.com/7/role/ExpenseExample", "http://www.blackrock.com/8/role/ExpenseExample", "http://www.blackrock.com/9/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExample" ], "lang": { "en-us": { "role": { "label": "Expense Example, with Redemption, 5 Years" } } }, "auth_ref": [ "r30" ] }, "oef_ExpenseExampleYear10": { "xbrltype": "nonNegativeMonetaryItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpenseExampleYear10", "presentation": [ "http://www.blackrock.com/1/role/ExpenseExample", "http://www.blackrock.com/10/role/ExpenseExample", "http://www.blackrock.com/11/role/ExpenseExample", "http://www.blackrock.com/12/role/ExpenseExample", "http://www.blackrock.com/13/role/ExpenseExample", "http://www.blackrock.com/14/role/ExpenseExample", "http://www.blackrock.com/15/role/ExpenseExample", "http://www.blackrock.com/16/role/ExpenseExample", "http://www.blackrock.com/17/role/ExpenseExample", "http://www.blackrock.com/18/role/ExpenseExample", "http://www.blackrock.com/19/role/ExpenseExample", "http://www.blackrock.com/2/role/ExpenseExample", "http://www.blackrock.com/20/role/ExpenseExample", "http://www.blackrock.com/3/role/ExpenseExample", "http://www.blackrock.com/4/role/ExpenseExample", "http://www.blackrock.com/5/role/ExpenseExample", "http://www.blackrock.com/6/role/ExpenseExample", "http://www.blackrock.com/7/role/ExpenseExample", "http://www.blackrock.com/8/role/ExpenseExample", "http://www.blackrock.com/9/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExample" ], "lang": { "en-us": { "role": { "label": "Expense Example, with Redemption, 10 Years" } } }, "auth_ref": [ "r30" ] }, "oef_ExpenseFootnotesTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpenseFootnotesTextBlock", "presentation": [ "http://www.blackrock.com/1/role/FeesAndExpenses", "http://www.blackrock.com/10/role/FeesAndExpenses", "http://www.blackrock.com/11/role/FeesAndExpenses", "http://www.blackrock.com/12/role/FeesAndExpenses", "http://www.blackrock.com/13/role/FeesAndExpenses", "http://www.blackrock.com/14/role/FeesAndExpenses", "http://www.blackrock.com/15/role/FeesAndExpenses", "http://www.blackrock.com/16/role/FeesAndExpenses", "http://www.blackrock.com/17/role/FeesAndExpenses", "http://www.blackrock.com/18/role/FeesAndExpenses", "http://www.blackrock.com/19/role/FeesAndExpenses", "http://www.blackrock.com/2/role/FeesAndExpenses", "http://www.blackrock.com/20/role/FeesAndExpenses", "http://www.blackrock.com/3/role/FeesAndExpenses", "http://www.blackrock.com/4/role/FeesAndExpenses", "http://www.blackrock.com/5/role/FeesAndExpenses", "http://www.blackrock.com/6/role/FeesAndExpenses", "http://www.blackrock.com/7/role/FeesAndExpenses", "http://www.blackrock.com/8/role/FeesAndExpenses", "http://www.blackrock.com/9/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/FeesAndExpenses" ], "lang": { "en-us": { "role": { "label": "Expense Footnotes [Text Block]" } } }, "auth_ref": [ "r17" ] }, "oef_ExpenseHeading": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpenseHeading", "presentation": [ "http://www.blackrock.com/1/role/FeesAndExpenses", "http://www.blackrock.com/10/role/FeesAndExpenses", "http://www.blackrock.com/11/role/FeesAndExpenses", "http://www.blackrock.com/12/role/FeesAndExpenses", "http://www.blackrock.com/13/role/FeesAndExpenses", "http://www.blackrock.com/14/role/FeesAndExpenses", "http://www.blackrock.com/15/role/FeesAndExpenses", "http://www.blackrock.com/16/role/FeesAndExpenses", "http://www.blackrock.com/17/role/FeesAndExpenses", "http://www.blackrock.com/18/role/FeesAndExpenses", "http://www.blackrock.com/19/role/FeesAndExpenses", "http://www.blackrock.com/2/role/FeesAndExpenses", "http://www.blackrock.com/20/role/FeesAndExpenses", "http://www.blackrock.com/3/role/FeesAndExpenses", "http://www.blackrock.com/4/role/FeesAndExpenses", "http://www.blackrock.com/5/role/FeesAndExpenses", "http://www.blackrock.com/6/role/FeesAndExpenses", "http://www.blackrock.com/7/role/FeesAndExpenses", "http://www.blackrock.com/8/role/FeesAndExpenses", "http://www.blackrock.com/9/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/FeesAndExpenses" ], "lang": { "en-us": { "role": { "label": "Expense Heading [Optional Text]" } } }, "auth_ref": [ "r11" ] }, "oef_ExpenseNarrativeTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpenseNarrativeTextBlock", "presentation": [ "http://www.blackrock.com/1/role/FeesAndExpenses", "http://www.blackrock.com/10/role/FeesAndExpenses", "http://www.blackrock.com/11/role/FeesAndExpenses", "http://www.blackrock.com/12/role/FeesAndExpenses", "http://www.blackrock.com/13/role/FeesAndExpenses", "http://www.blackrock.com/14/role/FeesAndExpenses", "http://www.blackrock.com/15/role/FeesAndExpenses", "http://www.blackrock.com/16/role/FeesAndExpenses", "http://www.blackrock.com/17/role/FeesAndExpenses", "http://www.blackrock.com/18/role/FeesAndExpenses", "http://www.blackrock.com/19/role/FeesAndExpenses", "http://www.blackrock.com/2/role/FeesAndExpenses", "http://www.blackrock.com/20/role/FeesAndExpenses", "http://www.blackrock.com/3/role/FeesAndExpenses", "http://www.blackrock.com/4/role/FeesAndExpenses", "http://www.blackrock.com/5/role/FeesAndExpenses", "http://www.blackrock.com/6/role/FeesAndExpenses", "http://www.blackrock.com/7/role/FeesAndExpenses", "http://www.blackrock.com/8/role/FeesAndExpenses", "http://www.blackrock.com/9/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/FeesAndExpenses" ], "lang": { "en-us": { "role": { "label": "Expense Narrative [Text Block]" } } }, "auth_ref": [ "r12" ] }, "oef_ExpensesDeferredChargesTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpensesDeferredChargesTextBlock", "presentation": [ "http://www.blackrock.com/1/role/FeesAndExpenses", "http://www.blackrock.com/10/role/FeesAndExpenses", "http://www.blackrock.com/11/role/FeesAndExpenses", "http://www.blackrock.com/12/role/FeesAndExpenses", "http://www.blackrock.com/13/role/FeesAndExpenses", "http://www.blackrock.com/14/role/FeesAndExpenses", "http://www.blackrock.com/15/role/FeesAndExpenses", "http://www.blackrock.com/16/role/FeesAndExpenses", "http://www.blackrock.com/17/role/FeesAndExpenses", "http://www.blackrock.com/18/role/FeesAndExpenses", "http://www.blackrock.com/19/role/FeesAndExpenses", "http://www.blackrock.com/2/role/FeesAndExpenses", "http://www.blackrock.com/20/role/FeesAndExpenses", "http://www.blackrock.com/3/role/FeesAndExpenses", "http://www.blackrock.com/4/role/FeesAndExpenses", "http://www.blackrock.com/5/role/FeesAndExpenses", "http://www.blackrock.com/6/role/FeesAndExpenses", "http://www.blackrock.com/7/role/FeesAndExpenses", "http://www.blackrock.com/8/role/FeesAndExpenses", "http://www.blackrock.com/9/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/FeesAndExpenses" ], "lang": { "en-us": { "role": { "label": "Expenses Deferred Charges [Text Block]" } } }, "auth_ref": [ "r14" ] }, "oef_ExpensesExplanationOfNonrecurringAccountFee": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpensesExplanationOfNonrecurringAccountFee", "presentation": [ "http://www.blackrock.com/1/role/FeesAndExpenses", "http://www.blackrock.com/10/role/FeesAndExpenses", "http://www.blackrock.com/11/role/FeesAndExpenses", "http://www.blackrock.com/12/role/FeesAndExpenses", "http://www.blackrock.com/13/role/FeesAndExpenses", "http://www.blackrock.com/14/role/FeesAndExpenses", "http://www.blackrock.com/15/role/FeesAndExpenses", "http://www.blackrock.com/16/role/FeesAndExpenses", "http://www.blackrock.com/17/role/FeesAndExpenses", "http://www.blackrock.com/18/role/FeesAndExpenses", "http://www.blackrock.com/19/role/FeesAndExpenses", "http://www.blackrock.com/2/role/FeesAndExpenses", "http://www.blackrock.com/20/role/FeesAndExpenses", "http://www.blackrock.com/3/role/FeesAndExpenses", "http://www.blackrock.com/4/role/FeesAndExpenses", "http://www.blackrock.com/5/role/FeesAndExpenses", "http://www.blackrock.com/6/role/FeesAndExpenses", "http://www.blackrock.com/7/role/FeesAndExpenses", "http://www.blackrock.com/8/role/FeesAndExpenses", "http://www.blackrock.com/9/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/FeesAndExpenses" ], "lang": { "en-us": { "role": { "label": "Expenses Explanation of Nonrecurring Account Fee [Text]" } } }, "auth_ref": [ "r16" ] }, "oef_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpensesNotCorrelatedToRatioDueToAcquiredFundFees", "presentation": [ "http://www.blackrock.com/1/role/FeesAndExpenses", "http://www.blackrock.com/10/role/FeesAndExpenses", "http://www.blackrock.com/11/role/FeesAndExpenses", "http://www.blackrock.com/12/role/FeesAndExpenses", "http://www.blackrock.com/13/role/FeesAndExpenses", "http://www.blackrock.com/14/role/FeesAndExpenses", "http://www.blackrock.com/15/role/FeesAndExpenses", "http://www.blackrock.com/16/role/FeesAndExpenses", "http://www.blackrock.com/17/role/FeesAndExpenses", "http://www.blackrock.com/18/role/FeesAndExpenses", "http://www.blackrock.com/19/role/FeesAndExpenses", "http://www.blackrock.com/2/role/FeesAndExpenses", "http://www.blackrock.com/20/role/FeesAndExpenses", "http://www.blackrock.com/3/role/FeesAndExpenses", "http://www.blackrock.com/4/role/FeesAndExpenses", "http://www.blackrock.com/5/role/FeesAndExpenses", "http://www.blackrock.com/6/role/FeesAndExpenses", "http://www.blackrock.com/7/role/FeesAndExpenses", "http://www.blackrock.com/8/role/FeesAndExpenses", "http://www.blackrock.com/9/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/FeesAndExpenses" ], "lang": { "en-us": { "role": { "label": "Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text]" } } }, "auth_ref": [ "r29" ] }, "oef_ExpensesOtherExpensesHadExtraordinaryExpensesBeenIncluded": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpensesOtherExpensesHadExtraordinaryExpensesBeenIncluded", "presentation": [ "http://www.blackrock.com/1/role/FeesAndExpenses", "http://www.blackrock.com/10/role/FeesAndExpenses", "http://www.blackrock.com/11/role/FeesAndExpenses", "http://www.blackrock.com/12/role/FeesAndExpenses", "http://www.blackrock.com/13/role/FeesAndExpenses", "http://www.blackrock.com/14/role/FeesAndExpenses", "http://www.blackrock.com/15/role/FeesAndExpenses", "http://www.blackrock.com/16/role/FeesAndExpenses", "http://www.blackrock.com/17/role/FeesAndExpenses", "http://www.blackrock.com/18/role/FeesAndExpenses", "http://www.blackrock.com/19/role/FeesAndExpenses", "http://www.blackrock.com/2/role/FeesAndExpenses", "http://www.blackrock.com/20/role/FeesAndExpenses", "http://www.blackrock.com/3/role/FeesAndExpenses", "http://www.blackrock.com/4/role/FeesAndExpenses", "http://www.blackrock.com/5/role/FeesAndExpenses", "http://www.blackrock.com/6/role/FeesAndExpenses", "http://www.blackrock.com/7/role/FeesAndExpenses", "http://www.blackrock.com/8/role/FeesAndExpenses", "http://www.blackrock.com/9/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/FeesAndExpenses" ], "lang": { "en-us": { "role": { "label": "Expenses Other Expenses Had Extraordinary Expenses Been Included [Text]" } } }, "auth_ref": [ "r21" ] }, "oef_ExpensesOverAssets": { "xbrltype": "nonNegativePure4ItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpensesOverAssets", "calculation": { "http://xbrl.sec.gov/rr/role/OperatingExpensesData": { "parentTag": "oef_NetExpensesOverAssets", "weight": 1.0, "order": 1.0 } }, "presentation": [ "http://www.blackrock.com/1/role/OperatingExpensesData", "http://www.blackrock.com/10/role/OperatingExpensesData", "http://www.blackrock.com/11/role/OperatingExpensesData", "http://www.blackrock.com/12/role/OperatingExpensesData", "http://www.blackrock.com/13/role/OperatingExpensesData", "http://www.blackrock.com/14/role/OperatingExpensesData", "http://www.blackrock.com/15/role/OperatingExpensesData", "http://www.blackrock.com/16/role/OperatingExpensesData", "http://www.blackrock.com/17/role/OperatingExpensesData", "http://www.blackrock.com/18/role/OperatingExpensesData", "http://www.blackrock.com/19/role/OperatingExpensesData", "http://www.blackrock.com/2/role/OperatingExpensesData", "http://www.blackrock.com/20/role/OperatingExpensesData", "http://www.blackrock.com/3/role/OperatingExpensesData", "http://www.blackrock.com/4/role/OperatingExpensesData", "http://www.blackrock.com/5/role/OperatingExpensesData", "http://www.blackrock.com/6/role/OperatingExpensesData", "http://www.blackrock.com/7/role/OperatingExpensesData", "http://www.blackrock.com/8/role/OperatingExpensesData", "http://www.blackrock.com/9/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/OperatingExpensesData" ], "lang": { "en-us": { "role": { "label": "Expenses (as a percentage of Assets)", "totalLabel": "Total Expenses" } } }, "auth_ref": [ "r23" ] }, "oef_ExpensesRangeOfExchangeFeesTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpensesRangeOfExchangeFeesTextBlock", "presentation": [ "http://www.blackrock.com/1/role/FeesAndExpenses", "http://www.blackrock.com/10/role/FeesAndExpenses", "http://www.blackrock.com/11/role/FeesAndExpenses", "http://www.blackrock.com/12/role/FeesAndExpenses", "http://www.blackrock.com/13/role/FeesAndExpenses", "http://www.blackrock.com/14/role/FeesAndExpenses", "http://www.blackrock.com/15/role/FeesAndExpenses", "http://www.blackrock.com/16/role/FeesAndExpenses", "http://www.blackrock.com/17/role/FeesAndExpenses", "http://www.blackrock.com/18/role/FeesAndExpenses", "http://www.blackrock.com/19/role/FeesAndExpenses", "http://www.blackrock.com/2/role/FeesAndExpenses", "http://www.blackrock.com/20/role/FeesAndExpenses", "http://www.blackrock.com/3/role/FeesAndExpenses", "http://www.blackrock.com/4/role/FeesAndExpenses", "http://www.blackrock.com/5/role/FeesAndExpenses", "http://www.blackrock.com/6/role/FeesAndExpenses", "http://www.blackrock.com/7/role/FeesAndExpenses", "http://www.blackrock.com/8/role/FeesAndExpenses", "http://www.blackrock.com/9/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/FeesAndExpenses" ], "lang": { "en-us": { "role": { "label": "Expenses Range of Exchange Fees [Text Block]" } } }, "auth_ref": [ "r15" ] }, "oef_ExpensesRestatedToReflectCurrent": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpensesRestatedToReflectCurrent", "presentation": [ "http://www.blackrock.com/1/role/FeesAndExpenses", "http://www.blackrock.com/10/role/FeesAndExpenses", "http://www.blackrock.com/11/role/FeesAndExpenses", "http://www.blackrock.com/12/role/FeesAndExpenses", "http://www.blackrock.com/13/role/FeesAndExpenses", "http://www.blackrock.com/14/role/FeesAndExpenses", "http://www.blackrock.com/15/role/FeesAndExpenses", "http://www.blackrock.com/16/role/FeesAndExpenses", "http://www.blackrock.com/17/role/FeesAndExpenses", "http://www.blackrock.com/18/role/FeesAndExpenses", "http://www.blackrock.com/19/role/FeesAndExpenses", "http://www.blackrock.com/2/role/FeesAndExpenses", "http://www.blackrock.com/20/role/FeesAndExpenses", "http://www.blackrock.com/3/role/FeesAndExpenses", "http://www.blackrock.com/4/role/FeesAndExpenses", "http://www.blackrock.com/5/role/FeesAndExpenses", "http://www.blackrock.com/6/role/FeesAndExpenses", "http://www.blackrock.com/7/role/FeesAndExpenses", "http://www.blackrock.com/8/role/FeesAndExpenses", "http://www.blackrock.com/9/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/FeesAndExpenses" ], "lang": { "en-us": { "role": { "label": "Expenses Restated to Reflect Current [Text]" } } }, "auth_ref": [ "r24" ] }, "oef_FeeWaiverOrReimbursementOverAssets": { "xbrltype": "percentItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "FeeWaiverOrReimbursementOverAssets", "calculation": { "http://xbrl.sec.gov/rr/role/OperatingExpensesData": { "parentTag": "oef_NetExpensesOverAssets", "weight": 1.0, "order": 2.0 } }, "presentation": [ "http://www.blackrock.com/1/role/OperatingExpensesData", "http://www.blackrock.com/10/role/OperatingExpensesData", "http://www.blackrock.com/11/role/OperatingExpensesData", "http://www.blackrock.com/12/role/OperatingExpensesData", "http://www.blackrock.com/13/role/OperatingExpensesData", "http://www.blackrock.com/14/role/OperatingExpensesData", "http://www.blackrock.com/15/role/OperatingExpensesData", "http://www.blackrock.com/16/role/OperatingExpensesData", "http://www.blackrock.com/17/role/OperatingExpensesData", "http://www.blackrock.com/18/role/OperatingExpensesData", "http://www.blackrock.com/19/role/OperatingExpensesData", "http://www.blackrock.com/2/role/OperatingExpensesData", "http://www.blackrock.com/20/role/OperatingExpensesData", "http://www.blackrock.com/3/role/OperatingExpensesData", "http://www.blackrock.com/4/role/OperatingExpensesData", "http://www.blackrock.com/5/role/OperatingExpensesData", "http://www.blackrock.com/6/role/OperatingExpensesData", "http://www.blackrock.com/7/role/OperatingExpensesData", "http://www.blackrock.com/8/role/OperatingExpensesData", "http://www.blackrock.com/9/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/OperatingExpensesData" ], "lang": { "en-us": { "role": { "label": "Fee Waiver or Reimbursement", "negatedLabel": "Fee Waiver or Reimbursement" } } }, "auth_ref": [ "r26" ] }, "oef_FeeWaiverOrReimbursementOverAssetsDateOfTermination": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "FeeWaiverOrReimbursementOverAssetsDateOfTermination", "presentation": [ "http://www.blackrock.com/1/role/OperatingExpensesData", "http://www.blackrock.com/10/role/OperatingExpensesData", "http://www.blackrock.com/11/role/OperatingExpensesData", "http://www.blackrock.com/12/role/OperatingExpensesData", "http://www.blackrock.com/13/role/OperatingExpensesData", "http://www.blackrock.com/14/role/OperatingExpensesData", "http://www.blackrock.com/15/role/OperatingExpensesData", "http://www.blackrock.com/16/role/OperatingExpensesData", "http://www.blackrock.com/17/role/OperatingExpensesData", "http://www.blackrock.com/18/role/OperatingExpensesData", "http://www.blackrock.com/19/role/OperatingExpensesData", "http://www.blackrock.com/2/role/OperatingExpensesData", "http://www.blackrock.com/20/role/OperatingExpensesData", "http://www.blackrock.com/3/role/OperatingExpensesData", "http://www.blackrock.com/4/role/OperatingExpensesData", "http://www.blackrock.com/5/role/OperatingExpensesData", "http://www.blackrock.com/6/role/OperatingExpensesData", "http://www.blackrock.com/7/role/OperatingExpensesData", "http://www.blackrock.com/8/role/OperatingExpensesData", "http://www.blackrock.com/9/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/OperatingExpensesData" ], "lang": { "en-us": { "role": { "label": "Fee Waiver or Reimbursement over Assets, Date of Termination" } } }, "auth_ref": [ "r26" ] }, "bf3_ForeignSecuritiesRiskMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "ForeignSecuritiesRiskMember", "presentation": [ "http://www.blackrock.com/1/role/InvestmentRisks", "http://www.blackrock.com/10/role/InvestmentRisks", "http://www.blackrock.com/11/role/InvestmentRisks", "http://www.blackrock.com/12/role/InvestmentRisks", "http://www.blackrock.com/13/role/InvestmentRisks", "http://www.blackrock.com/14/role/InvestmentRisks", "http://www.blackrock.com/15/role/InvestmentRisks", "http://www.blackrock.com/16/role/InvestmentRisks", "http://www.blackrock.com/17/role/InvestmentRisks", "http://www.blackrock.com/18/role/InvestmentRisks", "http://www.blackrock.com/19/role/InvestmentRisks", "http://www.blackrock.com/2/role/InvestmentRisks", "http://www.blackrock.com/20/role/InvestmentRisks", "http://www.blackrock.com/3/role/InvestmentRisks", "http://www.blackrock.com/4/role/InvestmentRisks", "http://www.blackrock.com/5/role/InvestmentRisks", "http://www.blackrock.com/6/role/InvestmentRisks", "http://www.blackrock.com/7/role/InvestmentRisks", "http://www.blackrock.com/8/role/InvestmentRisks", "http://www.blackrock.com/9/role/InvestmentRisks" ], "lang": { "en-us": { "role": { "label": "Foreign Securities Risk [Member]" } } }, "auth_ref": [] }, "oef_FormN1aAbstract": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "FormN1aAbstract", "lang": { "en-us": { "role": { "label": "Form N-1A:" } } }, "auth_ref": [ "r2" ] }, "bf3_GeographicRiskMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "GeographicRiskMember", "presentation": [ "http://www.blackrock.com/1/role/InvestmentRisks", "http://www.blackrock.com/10/role/InvestmentRisks", "http://www.blackrock.com/11/role/InvestmentRisks", "http://www.blackrock.com/12/role/InvestmentRisks", "http://www.blackrock.com/13/role/InvestmentRisks", "http://www.blackrock.com/14/role/InvestmentRisks", "http://www.blackrock.com/15/role/InvestmentRisks", "http://www.blackrock.com/16/role/InvestmentRisks", "http://www.blackrock.com/17/role/InvestmentRisks", "http://www.blackrock.com/18/role/InvestmentRisks", "http://www.blackrock.com/19/role/InvestmentRisks", "http://www.blackrock.com/2/role/InvestmentRisks", "http://www.blackrock.com/20/role/InvestmentRisks", "http://www.blackrock.com/3/role/InvestmentRisks", "http://www.blackrock.com/4/role/InvestmentRisks", "http://www.blackrock.com/5/role/InvestmentRisks", "http://www.blackrock.com/6/role/InvestmentRisks", "http://www.blackrock.com/7/role/InvestmentRisks", "http://www.blackrock.com/8/role/InvestmentRisks", "http://www.blackrock.com/9/role/InvestmentRisks" ], "lang": { "en-us": { "role": { "label": "Geographic Risk [Member]" } } }, "auth_ref": [] }, "oef_HighestQuarterlyReturnLabel": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "HighestQuarterlyReturnLabel", "presentation": [ "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/9/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Highest Quarterly Return, Label [Optional Text]" } } }, "auth_ref": [ "r44" ] }, "bf3_IncomeRiskMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "IncomeRiskMember", "presentation": [ "http://www.blackrock.com/1/role/InvestmentRisks", "http://www.blackrock.com/10/role/InvestmentRisks", "http://www.blackrock.com/11/role/InvestmentRisks", "http://www.blackrock.com/12/role/InvestmentRisks", "http://www.blackrock.com/13/role/InvestmentRisks", "http://www.blackrock.com/14/role/InvestmentRisks", "http://www.blackrock.com/15/role/InvestmentRisks", "http://www.blackrock.com/16/role/InvestmentRisks", "http://www.blackrock.com/17/role/InvestmentRisks", "http://www.blackrock.com/18/role/InvestmentRisks", "http://www.blackrock.com/19/role/InvestmentRisks", "http://www.blackrock.com/2/role/InvestmentRisks", "http://www.blackrock.com/20/role/InvestmentRisks", "http://www.blackrock.com/3/role/InvestmentRisks", "http://www.blackrock.com/4/role/InvestmentRisks", "http://www.blackrock.com/5/role/InvestmentRisks", "http://www.blackrock.com/6/role/InvestmentRisks", "http://www.blackrock.com/7/role/InvestmentRisks", "http://www.blackrock.com/8/role/InvestmentRisks", "http://www.blackrock.com/9/role/InvestmentRisks" ], "lang": { "en-us": { "role": { "label": "Income Risk [Member]" } } }, "auth_ref": [] }, "oef_IndexNoDeductionForFeesExpensesTaxes": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "IndexNoDeductionForFeesExpensesTaxes", "presentation": [ "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/9/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Index No Deduction for Fees, Expenses, or Taxes [Text]" } } }, "auth_ref": [ "r48" ] }, "bf3_IndexRelatedRiskMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "IndexRelatedRiskMember", "presentation": [ "http://www.blackrock.com/1/role/InvestmentRisks", "http://www.blackrock.com/10/role/InvestmentRisks", "http://www.blackrock.com/11/role/InvestmentRisks", "http://www.blackrock.com/12/role/InvestmentRisks", "http://www.blackrock.com/13/role/InvestmentRisks", "http://www.blackrock.com/14/role/InvestmentRisks", "http://www.blackrock.com/15/role/InvestmentRisks", "http://www.blackrock.com/16/role/InvestmentRisks", "http://www.blackrock.com/17/role/InvestmentRisks", "http://www.blackrock.com/18/role/InvestmentRisks", "http://www.blackrock.com/19/role/InvestmentRisks", "http://www.blackrock.com/2/role/InvestmentRisks", "http://www.blackrock.com/20/role/InvestmentRisks", "http://www.blackrock.com/3/role/InvestmentRisks", "http://www.blackrock.com/4/role/InvestmentRisks", "http://www.blackrock.com/5/role/InvestmentRisks", "http://www.blackrock.com/6/role/InvestmentRisks", "http://www.blackrock.com/7/role/InvestmentRisks", "http://www.blackrock.com/8/role/InvestmentRisks", "http://www.blackrock.com/9/role/InvestmentRisks" ], "lang": { "en-us": { "role": { "label": "Index Related Risk [Member]" } } }, "auth_ref": [] }, "bf3_InflationIndexedBondsRiskMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "InflationIndexedBondsRiskMember", "presentation": [ "http://www.blackrock.com/1/role/InvestmentRisks", "http://www.blackrock.com/10/role/InvestmentRisks", "http://www.blackrock.com/11/role/InvestmentRisks", "http://www.blackrock.com/12/role/InvestmentRisks", "http://www.blackrock.com/13/role/InvestmentRisks", "http://www.blackrock.com/14/role/InvestmentRisks", "http://www.blackrock.com/15/role/InvestmentRisks", "http://www.blackrock.com/16/role/InvestmentRisks", "http://www.blackrock.com/17/role/InvestmentRisks", "http://www.blackrock.com/18/role/InvestmentRisks", "http://www.blackrock.com/19/role/InvestmentRisks", "http://www.blackrock.com/2/role/InvestmentRisks", "http://www.blackrock.com/20/role/InvestmentRisks", "http://www.blackrock.com/3/role/InvestmentRisks", "http://www.blackrock.com/4/role/InvestmentRisks", "http://www.blackrock.com/5/role/InvestmentRisks", "http://www.blackrock.com/6/role/InvestmentRisks", "http://www.blackrock.com/7/role/InvestmentRisks", "http://www.blackrock.com/8/role/InvestmentRisks", "http://www.blackrock.com/9/role/InvestmentRisks" ], "lang": { "en-us": { "role": { "label": "Inflation Indexed Bonds Risk [Member]" } } }, "auth_ref": [] }, "bf3_InvestmentsInUnderlyingFundsRiskMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "InvestmentsInUnderlyingFundsRiskMember", "presentation": [ "http://www.blackrock.com/1/role/InvestmentRisks", "http://www.blackrock.com/10/role/InvestmentRisks", "http://www.blackrock.com/11/role/InvestmentRisks", "http://www.blackrock.com/12/role/InvestmentRisks", "http://www.blackrock.com/13/role/InvestmentRisks", "http://www.blackrock.com/14/role/InvestmentRisks", "http://www.blackrock.com/15/role/InvestmentRisks", "http://www.blackrock.com/16/role/InvestmentRisks", "http://www.blackrock.com/17/role/InvestmentRisks", "http://www.blackrock.com/18/role/InvestmentRisks", "http://www.blackrock.com/19/role/InvestmentRisks", "http://www.blackrock.com/2/role/InvestmentRisks", "http://www.blackrock.com/20/role/InvestmentRisks", "http://www.blackrock.com/3/role/InvestmentRisks", "http://www.blackrock.com/4/role/InvestmentRisks", "http://www.blackrock.com/5/role/InvestmentRisks", "http://www.blackrock.com/6/role/InvestmentRisks", "http://www.blackrock.com/7/role/InvestmentRisks", "http://www.blackrock.com/8/role/InvestmentRisks", "http://www.blackrock.com/9/role/InvestmentRisks" ], "lang": { "en-us": { "role": { "label": "Investments in Underlying Funds Risk [Member]" } } }, "auth_ref": [] }, "bf3_InvestorAInstitutionalMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "InvestorAInstitutionalMember", "presentation": [ "http://www.blackrock.com/1/role/BarChartData", "http://www.blackrock.com/1/role/ExpenseExample", "http://www.blackrock.com/1/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/1/role/FeesAndExpenses", "http://www.blackrock.com/1/role/InvestmentRisks", "http://www.blackrock.com/1/role/InvestmentStrategy", "http://www.blackrock.com/1/role/N1aCover", "http://www.blackrock.com/1/role/N1aSupplement", "http://www.blackrock.com/1/role/OperatingExpensesData", "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/1/role/PerformanceTableData", "http://www.blackrock.com/1/role/RiskReturn", "http://www.blackrock.com/1/role/ShareholderFeesData", "http://www.blackrock.com/10/role/BarChartData", "http://www.blackrock.com/10/role/ExpenseExample", "http://www.blackrock.com/10/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/10/role/FeesAndExpenses", "http://www.blackrock.com/10/role/InvestmentRisks", "http://www.blackrock.com/10/role/InvestmentStrategy", "http://www.blackrock.com/10/role/N1aCover", "http://www.blackrock.com/10/role/N1aSupplement", "http://www.blackrock.com/10/role/OperatingExpensesData", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/10/role/PerformanceTableData", "http://www.blackrock.com/10/role/RiskReturn", "http://www.blackrock.com/10/role/ShareholderFeesData", "http://www.blackrock.com/2/role/BarChartData", "http://www.blackrock.com/2/role/ExpenseExample", "http://www.blackrock.com/2/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/2/role/FeesAndExpenses", "http://www.blackrock.com/2/role/InvestmentRisks", "http://www.blackrock.com/2/role/InvestmentStrategy", "http://www.blackrock.com/2/role/N1aCover", "http://www.blackrock.com/2/role/N1aSupplement", "http://www.blackrock.com/2/role/OperatingExpensesData", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/2/role/PerformanceTableData", "http://www.blackrock.com/2/role/RiskReturn", "http://www.blackrock.com/2/role/ShareholderFeesData", "http://www.blackrock.com/3/role/BarChartData", "http://www.blackrock.com/3/role/ExpenseExample", "http://www.blackrock.com/3/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/3/role/FeesAndExpenses", "http://www.blackrock.com/3/role/InvestmentRisks", "http://www.blackrock.com/3/role/InvestmentStrategy", "http://www.blackrock.com/3/role/N1aCover", "http://www.blackrock.com/3/role/N1aSupplement", "http://www.blackrock.com/3/role/OperatingExpensesData", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/3/role/PerformanceTableData", "http://www.blackrock.com/3/role/RiskReturn", "http://www.blackrock.com/3/role/ShareholderFeesData", "http://www.blackrock.com/4/role/BarChartData", "http://www.blackrock.com/4/role/ExpenseExample", "http://www.blackrock.com/4/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/4/role/FeesAndExpenses", "http://www.blackrock.com/4/role/InvestmentRisks", "http://www.blackrock.com/4/role/InvestmentStrategy", "http://www.blackrock.com/4/role/N1aCover", "http://www.blackrock.com/4/role/N1aSupplement", "http://www.blackrock.com/4/role/OperatingExpensesData", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/4/role/PerformanceTableData", "http://www.blackrock.com/4/role/RiskReturn", "http://www.blackrock.com/4/role/ShareholderFeesData", "http://www.blackrock.com/5/role/BarChartData", "http://www.blackrock.com/5/role/ExpenseExample", "http://www.blackrock.com/5/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/5/role/FeesAndExpenses", "http://www.blackrock.com/5/role/InvestmentRisks", "http://www.blackrock.com/5/role/InvestmentStrategy", "http://www.blackrock.com/5/role/N1aCover", "http://www.blackrock.com/5/role/N1aSupplement", "http://www.blackrock.com/5/role/OperatingExpensesData", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/5/role/PerformanceTableData", "http://www.blackrock.com/5/role/RiskReturn", "http://www.blackrock.com/5/role/ShareholderFeesData", "http://www.blackrock.com/6/role/BarChartData", "http://www.blackrock.com/6/role/ExpenseExample", "http://www.blackrock.com/6/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/6/role/FeesAndExpenses", "http://www.blackrock.com/6/role/InvestmentRisks", "http://www.blackrock.com/6/role/InvestmentStrategy", "http://www.blackrock.com/6/role/N1aCover", "http://www.blackrock.com/6/role/N1aSupplement", "http://www.blackrock.com/6/role/OperatingExpensesData", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/6/role/PerformanceTableData", "http://www.blackrock.com/6/role/RiskReturn", "http://www.blackrock.com/6/role/ShareholderFeesData", "http://www.blackrock.com/7/role/BarChartData", "http://www.blackrock.com/7/role/ExpenseExample", "http://www.blackrock.com/7/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/7/role/FeesAndExpenses", "http://www.blackrock.com/7/role/InvestmentRisks", "http://www.blackrock.com/7/role/InvestmentStrategy", "http://www.blackrock.com/7/role/N1aCover", "http://www.blackrock.com/7/role/N1aSupplement", "http://www.blackrock.com/7/role/OperatingExpensesData", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/7/role/PerformanceTableData", "http://www.blackrock.com/7/role/RiskReturn", "http://www.blackrock.com/7/role/ShareholderFeesData", "http://www.blackrock.com/8/role/BarChartData", "http://www.blackrock.com/8/role/ExpenseExample", "http://www.blackrock.com/8/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/8/role/FeesAndExpenses", "http://www.blackrock.com/8/role/InvestmentRisks", "http://www.blackrock.com/8/role/InvestmentStrategy", "http://www.blackrock.com/8/role/N1aCover", "http://www.blackrock.com/8/role/N1aSupplement", "http://www.blackrock.com/8/role/OperatingExpensesData", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/8/role/PerformanceTableData", "http://www.blackrock.com/8/role/RiskReturn", "http://www.blackrock.com/8/role/ShareholderFeesData", "http://www.blackrock.com/9/role/BarChartData", "http://www.blackrock.com/9/role/ExpenseExample", "http://www.blackrock.com/9/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/9/role/FeesAndExpenses", "http://www.blackrock.com/9/role/InvestmentRisks", "http://www.blackrock.com/9/role/InvestmentStrategy", "http://www.blackrock.com/9/role/N1aCover", "http://www.blackrock.com/9/role/N1aSupplement", "http://www.blackrock.com/9/role/OperatingExpensesData", "http://www.blackrock.com/9/role/PerformanceManagement", "http://www.blackrock.com/9/role/PerformanceTableData", "http://www.blackrock.com/9/role/RiskReturn", "http://www.blackrock.com/9/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "verboseLabel": "Investor A, Institutional", "label": "Investor A Institutional [Member]" } } }, "auth_ref": [] }, "bf3_IssuerRiskMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "IssuerRiskMember", "presentation": [ "http://www.blackrock.com/1/role/InvestmentRisks", "http://www.blackrock.com/10/role/InvestmentRisks", "http://www.blackrock.com/11/role/InvestmentRisks", "http://www.blackrock.com/12/role/InvestmentRisks", "http://www.blackrock.com/13/role/InvestmentRisks", "http://www.blackrock.com/14/role/InvestmentRisks", "http://www.blackrock.com/15/role/InvestmentRisks", "http://www.blackrock.com/16/role/InvestmentRisks", "http://www.blackrock.com/17/role/InvestmentRisks", "http://www.blackrock.com/18/role/InvestmentRisks", "http://www.blackrock.com/19/role/InvestmentRisks", "http://www.blackrock.com/2/role/InvestmentRisks", "http://www.blackrock.com/20/role/InvestmentRisks", "http://www.blackrock.com/3/role/InvestmentRisks", "http://www.blackrock.com/4/role/InvestmentRisks", "http://www.blackrock.com/5/role/InvestmentRisks", "http://www.blackrock.com/6/role/InvestmentRisks", "http://www.blackrock.com/7/role/InvestmentRisks", "http://www.blackrock.com/8/role/InvestmentRisks", "http://www.blackrock.com/9/role/InvestmentRisks" ], "lang": { "en-us": { "role": { "label": "Issuer Risk [Member]" } } }, "auth_ref": [] }, "bf3_LargeCapitalizationCompaniesRiskMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "LargeCapitalizationCompaniesRiskMember", "presentation": [ "http://www.blackrock.com/1/role/InvestmentRisks", "http://www.blackrock.com/10/role/InvestmentRisks", "http://www.blackrock.com/11/role/InvestmentRisks", "http://www.blackrock.com/12/role/InvestmentRisks", "http://www.blackrock.com/13/role/InvestmentRisks", "http://www.blackrock.com/14/role/InvestmentRisks", "http://www.blackrock.com/15/role/InvestmentRisks", "http://www.blackrock.com/16/role/InvestmentRisks", "http://www.blackrock.com/17/role/InvestmentRisks", "http://www.blackrock.com/18/role/InvestmentRisks", "http://www.blackrock.com/19/role/InvestmentRisks", "http://www.blackrock.com/2/role/InvestmentRisks", "http://www.blackrock.com/20/role/InvestmentRisks", "http://www.blackrock.com/3/role/InvestmentRisks", "http://www.blackrock.com/4/role/InvestmentRisks", "http://www.blackrock.com/5/role/InvestmentRisks", "http://www.blackrock.com/6/role/InvestmentRisks", "http://www.blackrock.com/7/role/InvestmentRisks", "http://www.blackrock.com/8/role/InvestmentRisks", "http://www.blackrock.com/9/role/InvestmentRisks" ], "lang": { "en-us": { "role": { "label": "Large Capitalization Companies Risk [Member]" } } }, "auth_ref": [] }, "bf3_LargeShareholderAndLargeScaleRedemptionRiskMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "LargeShareholderAndLargeScaleRedemptionRiskMember", "presentation": [ "http://www.blackrock.com/1/role/InvestmentRisks", "http://www.blackrock.com/10/role/InvestmentRisks", "http://www.blackrock.com/11/role/InvestmentRisks", "http://www.blackrock.com/12/role/InvestmentRisks", "http://www.blackrock.com/13/role/InvestmentRisks", "http://www.blackrock.com/14/role/InvestmentRisks", "http://www.blackrock.com/15/role/InvestmentRisks", "http://www.blackrock.com/16/role/InvestmentRisks", "http://www.blackrock.com/17/role/InvestmentRisks", "http://www.blackrock.com/18/role/InvestmentRisks", "http://www.blackrock.com/19/role/InvestmentRisks", "http://www.blackrock.com/2/role/InvestmentRisks", "http://www.blackrock.com/20/role/InvestmentRisks", "http://www.blackrock.com/3/role/InvestmentRisks", "http://www.blackrock.com/4/role/InvestmentRisks", "http://www.blackrock.com/5/role/InvestmentRisks", "http://www.blackrock.com/6/role/InvestmentRisks", "http://www.blackrock.com/7/role/InvestmentRisks", "http://www.blackrock.com/8/role/InvestmentRisks", "http://www.blackrock.com/9/role/InvestmentRisks" ], "lang": { "en-us": { "role": { "label": "Large Shareholder and Large Scale Redemption Risk [Member]" } } }, "auth_ref": [] }, "dei_LegalEntityAxis": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/dei/2025", "localname": "LegalEntityAxis", "presentation": [ "http://www.blackrock.com/1/role/BarChartData", "http://www.blackrock.com/1/role/ExpenseExample", "http://www.blackrock.com/1/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/1/role/FeesAndExpenses", "http://www.blackrock.com/1/role/InvestmentRisks", "http://www.blackrock.com/1/role/InvestmentStrategy", "http://www.blackrock.com/1/role/N1aSupplement", "http://www.blackrock.com/1/role/OperatingExpensesData", "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/1/role/RiskReturn", "http://www.blackrock.com/1/role/ShareholderFeesData", "http://www.blackrock.com/10/role/BarChartData", "http://www.blackrock.com/10/role/ExpenseExample", "http://www.blackrock.com/10/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/10/role/FeesAndExpenses", "http://www.blackrock.com/10/role/InvestmentRisks", "http://www.blackrock.com/10/role/InvestmentStrategy", "http://www.blackrock.com/10/role/N1aSupplement", "http://www.blackrock.com/10/role/OperatingExpensesData", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/10/role/RiskReturn", "http://www.blackrock.com/10/role/ShareholderFeesData", "http://www.blackrock.com/11/role/BarChartData", "http://www.blackrock.com/11/role/ExpenseExample", "http://www.blackrock.com/11/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/11/role/FeesAndExpenses", "http://www.blackrock.com/11/role/InvestmentRisks", "http://www.blackrock.com/11/role/InvestmentStrategy", "http://www.blackrock.com/11/role/N1aSupplement", "http://www.blackrock.com/11/role/OperatingExpensesData", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/11/role/RiskReturn", "http://www.blackrock.com/11/role/ShareholderFeesData", "http://www.blackrock.com/12/role/BarChartData", "http://www.blackrock.com/12/role/ExpenseExample", "http://www.blackrock.com/12/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/12/role/FeesAndExpenses", "http://www.blackrock.com/12/role/InvestmentRisks", "http://www.blackrock.com/12/role/InvestmentStrategy", "http://www.blackrock.com/12/role/N1aSupplement", "http://www.blackrock.com/12/role/OperatingExpensesData", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/12/role/RiskReturn", "http://www.blackrock.com/12/role/ShareholderFeesData", "http://www.blackrock.com/13/role/BarChartData", "http://www.blackrock.com/13/role/ExpenseExample", "http://www.blackrock.com/13/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/13/role/FeesAndExpenses", "http://www.blackrock.com/13/role/InvestmentRisks", "http://www.blackrock.com/13/role/InvestmentStrategy", "http://www.blackrock.com/13/role/N1aSupplement", "http://www.blackrock.com/13/role/OperatingExpensesData", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/13/role/RiskReturn", "http://www.blackrock.com/13/role/ShareholderFeesData", "http://www.blackrock.com/14/role/BarChartData", "http://www.blackrock.com/14/role/ExpenseExample", "http://www.blackrock.com/14/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/14/role/FeesAndExpenses", "http://www.blackrock.com/14/role/InvestmentRisks", "http://www.blackrock.com/14/role/InvestmentStrategy", "http://www.blackrock.com/14/role/N1aSupplement", "http://www.blackrock.com/14/role/OperatingExpensesData", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/14/role/RiskReturn", "http://www.blackrock.com/14/role/ShareholderFeesData", "http://www.blackrock.com/15/role/BarChartData", "http://www.blackrock.com/15/role/ExpenseExample", "http://www.blackrock.com/15/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/15/role/FeesAndExpenses", "http://www.blackrock.com/15/role/InvestmentRisks", "http://www.blackrock.com/15/role/InvestmentStrategy", "http://www.blackrock.com/15/role/N1aSupplement", "http://www.blackrock.com/15/role/OperatingExpensesData", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/15/role/RiskReturn", "http://www.blackrock.com/15/role/ShareholderFeesData", "http://www.blackrock.com/16/role/BarChartData", "http://www.blackrock.com/16/role/ExpenseExample", "http://www.blackrock.com/16/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/16/role/FeesAndExpenses", "http://www.blackrock.com/16/role/InvestmentRisks", "http://www.blackrock.com/16/role/InvestmentStrategy", "http://www.blackrock.com/16/role/N1aSupplement", "http://www.blackrock.com/16/role/OperatingExpensesData", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/16/role/RiskReturn", "http://www.blackrock.com/16/role/ShareholderFeesData", "http://www.blackrock.com/17/role/BarChartData", "http://www.blackrock.com/17/role/ExpenseExample", "http://www.blackrock.com/17/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/17/role/FeesAndExpenses", "http://www.blackrock.com/17/role/InvestmentRisks", "http://www.blackrock.com/17/role/InvestmentStrategy", "http://www.blackrock.com/17/role/N1aSupplement", "http://www.blackrock.com/17/role/OperatingExpensesData", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/17/role/RiskReturn", "http://www.blackrock.com/17/role/ShareholderFeesData", "http://www.blackrock.com/18/role/BarChartData", "http://www.blackrock.com/18/role/ExpenseExample", "http://www.blackrock.com/18/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/18/role/FeesAndExpenses", "http://www.blackrock.com/18/role/InvestmentRisks", "http://www.blackrock.com/18/role/InvestmentStrategy", "http://www.blackrock.com/18/role/N1aSupplement", "http://www.blackrock.com/18/role/OperatingExpensesData", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/18/role/RiskReturn", "http://www.blackrock.com/18/role/ShareholderFeesData", "http://www.blackrock.com/19/role/BarChartData", "http://www.blackrock.com/19/role/ExpenseExample", "http://www.blackrock.com/19/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/19/role/FeesAndExpenses", "http://www.blackrock.com/19/role/InvestmentRisks", "http://www.blackrock.com/19/role/InvestmentStrategy", "http://www.blackrock.com/19/role/N1aSupplement", "http://www.blackrock.com/19/role/OperatingExpensesData", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/19/role/RiskReturn", "http://www.blackrock.com/19/role/ShareholderFeesData", "http://www.blackrock.com/2/role/BarChartData", "http://www.blackrock.com/2/role/ExpenseExample", "http://www.blackrock.com/2/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/2/role/FeesAndExpenses", "http://www.blackrock.com/2/role/InvestmentRisks", "http://www.blackrock.com/2/role/InvestmentStrategy", "http://www.blackrock.com/2/role/N1aSupplement", "http://www.blackrock.com/2/role/OperatingExpensesData", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/2/role/RiskReturn", "http://www.blackrock.com/2/role/ShareholderFeesData", "http://www.blackrock.com/20/role/BarChartData", "http://www.blackrock.com/20/role/ExpenseExample", "http://www.blackrock.com/20/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/20/role/FeesAndExpenses", "http://www.blackrock.com/20/role/InvestmentRisks", "http://www.blackrock.com/20/role/InvestmentStrategy", "http://www.blackrock.com/20/role/N1aSupplement", "http://www.blackrock.com/20/role/OperatingExpensesData", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/20/role/RiskReturn", "http://www.blackrock.com/20/role/ShareholderFeesData", "http://www.blackrock.com/3/role/BarChartData", "http://www.blackrock.com/3/role/ExpenseExample", "http://www.blackrock.com/3/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/3/role/FeesAndExpenses", "http://www.blackrock.com/3/role/InvestmentRisks", "http://www.blackrock.com/3/role/InvestmentStrategy", "http://www.blackrock.com/3/role/N1aSupplement", "http://www.blackrock.com/3/role/OperatingExpensesData", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/3/role/RiskReturn", "http://www.blackrock.com/3/role/ShareholderFeesData", "http://www.blackrock.com/4/role/BarChartData", "http://www.blackrock.com/4/role/ExpenseExample", "http://www.blackrock.com/4/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/4/role/FeesAndExpenses", "http://www.blackrock.com/4/role/InvestmentRisks", "http://www.blackrock.com/4/role/InvestmentStrategy", "http://www.blackrock.com/4/role/N1aSupplement", "http://www.blackrock.com/4/role/OperatingExpensesData", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/4/role/RiskReturn", "http://www.blackrock.com/4/role/ShareholderFeesData", "http://www.blackrock.com/5/role/BarChartData", "http://www.blackrock.com/5/role/ExpenseExample", "http://www.blackrock.com/5/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/5/role/FeesAndExpenses", "http://www.blackrock.com/5/role/InvestmentRisks", "http://www.blackrock.com/5/role/InvestmentStrategy", "http://www.blackrock.com/5/role/N1aSupplement", "http://www.blackrock.com/5/role/OperatingExpensesData", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/5/role/RiskReturn", "http://www.blackrock.com/5/role/ShareholderFeesData", "http://www.blackrock.com/6/role/BarChartData", "http://www.blackrock.com/6/role/ExpenseExample", "http://www.blackrock.com/6/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/6/role/FeesAndExpenses", "http://www.blackrock.com/6/role/InvestmentRisks", "http://www.blackrock.com/6/role/InvestmentStrategy", "http://www.blackrock.com/6/role/N1aSupplement", "http://www.blackrock.com/6/role/OperatingExpensesData", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/6/role/RiskReturn", "http://www.blackrock.com/6/role/ShareholderFeesData", "http://www.blackrock.com/7/role/BarChartData", "http://www.blackrock.com/7/role/ExpenseExample", "http://www.blackrock.com/7/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/7/role/FeesAndExpenses", "http://www.blackrock.com/7/role/InvestmentRisks", "http://www.blackrock.com/7/role/InvestmentStrategy", "http://www.blackrock.com/7/role/N1aSupplement", "http://www.blackrock.com/7/role/OperatingExpensesData", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/7/role/RiskReturn", "http://www.blackrock.com/7/role/ShareholderFeesData", "http://www.blackrock.com/8/role/BarChartData", "http://www.blackrock.com/8/role/ExpenseExample", "http://www.blackrock.com/8/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/8/role/FeesAndExpenses", "http://www.blackrock.com/8/role/InvestmentRisks", "http://www.blackrock.com/8/role/InvestmentStrategy", "http://www.blackrock.com/8/role/N1aSupplement", "http://www.blackrock.com/8/role/OperatingExpensesData", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/8/role/RiskReturn", "http://www.blackrock.com/8/role/ShareholderFeesData", "http://www.blackrock.com/9/role/BarChartData", "http://www.blackrock.com/9/role/ExpenseExample", "http://www.blackrock.com/9/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/9/role/FeesAndExpenses", "http://www.blackrock.com/9/role/InvestmentRisks", "http://www.blackrock.com/9/role/InvestmentStrategy", "http://www.blackrock.com/9/role/N1aSupplement", "http://www.blackrock.com/9/role/OperatingExpensesData", "http://www.blackrock.com/9/role/PerformanceManagement", "http://www.blackrock.com/9/role/RiskReturn", "http://www.blackrock.com/9/role/ShareholderFeesData", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/InvestmentRisks", "http://xbrl.sec.gov/rr/role/InvestmentStrategy", "http://xbrl.sec.gov/rr/role/N1aSupplement", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/RiskReturn", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "Series [Axis]", "documentation": "The set of legal entities associated with a report." } } }, "auth_ref": [] }, "oef_LowestQuarterlyReturnLabel": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "LowestQuarterlyReturnLabel", "presentation": [ "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/9/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Lowest Quarterly Return, Label [Optional Text]" } } }, "auth_ref": [ "r44" ] }, "oef_ManagementFeesOverAssets": { "xbrltype": "nonNegativePure4ItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ManagementFeesOverAssets", "calculation": { "http://xbrl.sec.gov/rr/role/OperatingExpensesData": { "parentTag": "oef_ExpensesOverAssets", "weight": 1.0, "order": 1.0 } }, "presentation": [ "http://www.blackrock.com/1/role/OperatingExpensesData", "http://www.blackrock.com/10/role/OperatingExpensesData", "http://www.blackrock.com/11/role/OperatingExpensesData", "http://www.blackrock.com/12/role/OperatingExpensesData", "http://www.blackrock.com/13/role/OperatingExpensesData", "http://www.blackrock.com/14/role/OperatingExpensesData", "http://www.blackrock.com/15/role/OperatingExpensesData", "http://www.blackrock.com/16/role/OperatingExpensesData", "http://www.blackrock.com/17/role/OperatingExpensesData", "http://www.blackrock.com/18/role/OperatingExpensesData", "http://www.blackrock.com/19/role/OperatingExpensesData", "http://www.blackrock.com/2/role/OperatingExpensesData", "http://www.blackrock.com/20/role/OperatingExpensesData", "http://www.blackrock.com/3/role/OperatingExpensesData", "http://www.blackrock.com/4/role/OperatingExpensesData", "http://www.blackrock.com/5/role/OperatingExpensesData", "http://www.blackrock.com/6/role/OperatingExpensesData", "http://www.blackrock.com/7/role/OperatingExpensesData", "http://www.blackrock.com/8/role/OperatingExpensesData", "http://www.blackrock.com/9/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/OperatingExpensesData" ], "lang": { "en-us": { "role": { "label": "Management Fees (as a percentage of Assets)" } } }, "auth_ref": [ "r18" ] }, "bf3_ManagementRiskMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "ManagementRiskMember", "presentation": [ "http://www.blackrock.com/1/role/InvestmentRisks", "http://www.blackrock.com/10/role/InvestmentRisks", "http://www.blackrock.com/11/role/InvestmentRisks", "http://www.blackrock.com/12/role/InvestmentRisks", "http://www.blackrock.com/13/role/InvestmentRisks", "http://www.blackrock.com/14/role/InvestmentRisks", "http://www.blackrock.com/15/role/InvestmentRisks", "http://www.blackrock.com/16/role/InvestmentRisks", "http://www.blackrock.com/17/role/InvestmentRisks", "http://www.blackrock.com/18/role/InvestmentRisks", "http://www.blackrock.com/19/role/InvestmentRisks", "http://www.blackrock.com/2/role/InvestmentRisks", "http://www.blackrock.com/20/role/InvestmentRisks", "http://www.blackrock.com/3/role/InvestmentRisks", "http://www.blackrock.com/4/role/InvestmentRisks", "http://www.blackrock.com/5/role/InvestmentRisks", "http://www.blackrock.com/6/role/InvestmentRisks", "http://www.blackrock.com/7/role/InvestmentRisks", "http://www.blackrock.com/8/role/InvestmentRisks", "http://www.blackrock.com/9/role/InvestmentRisks" ], "lang": { "en-us": { "role": { "label": "Management Risk [Member]" } } }, "auth_ref": [] }, "oef_MarketIndexPerformanceTableTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "MarketIndexPerformanceTableTextBlock", "presentation": [ "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/9/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Market Index Performance [Table]" } } }, "auth_ref": [ "r48" ] }, "bf3_MarketRiskAndSelectionRiskMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "MarketRiskAndSelectionRiskMember", "presentation": [ "http://www.blackrock.com/1/role/InvestmentRisks", "http://www.blackrock.com/10/role/InvestmentRisks", "http://www.blackrock.com/11/role/InvestmentRisks", "http://www.blackrock.com/12/role/InvestmentRisks", "http://www.blackrock.com/13/role/InvestmentRisks", "http://www.blackrock.com/14/role/InvestmentRisks", "http://www.blackrock.com/15/role/InvestmentRisks", "http://www.blackrock.com/16/role/InvestmentRisks", "http://www.blackrock.com/17/role/InvestmentRisks", "http://www.blackrock.com/18/role/InvestmentRisks", "http://www.blackrock.com/19/role/InvestmentRisks", "http://www.blackrock.com/2/role/InvestmentRisks", "http://www.blackrock.com/20/role/InvestmentRisks", "http://www.blackrock.com/3/role/InvestmentRisks", "http://www.blackrock.com/4/role/InvestmentRisks", "http://www.blackrock.com/5/role/InvestmentRisks", "http://www.blackrock.com/6/role/InvestmentRisks", "http://www.blackrock.com/7/role/InvestmentRisks", "http://www.blackrock.com/8/role/InvestmentRisks", "http://www.blackrock.com/9/role/InvestmentRisks" ], "lang": { "en-us": { "role": { "label": "Market Risk and Selection Risk [Member]" } } }, "auth_ref": [] }, "oef_MaximumAccountFee": { "xbrltype": "nonNegativeMonetaryItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "MaximumAccountFee", "presentation": [ "http://www.blackrock.com/1/role/ShareholderFeesData", "http://www.blackrock.com/10/role/ShareholderFeesData", "http://www.blackrock.com/11/role/ShareholderFeesData", "http://www.blackrock.com/12/role/ShareholderFeesData", "http://www.blackrock.com/13/role/ShareholderFeesData", "http://www.blackrock.com/14/role/ShareholderFeesData", "http://www.blackrock.com/15/role/ShareholderFeesData", "http://www.blackrock.com/16/role/ShareholderFeesData", "http://www.blackrock.com/17/role/ShareholderFeesData", "http://www.blackrock.com/18/role/ShareholderFeesData", "http://www.blackrock.com/19/role/ShareholderFeesData", "http://www.blackrock.com/2/role/ShareholderFeesData", "http://www.blackrock.com/20/role/ShareholderFeesData", "http://www.blackrock.com/3/role/ShareholderFeesData", "http://www.blackrock.com/4/role/ShareholderFeesData", "http://www.blackrock.com/5/role/ShareholderFeesData", "http://www.blackrock.com/6/role/ShareholderFeesData", "http://www.blackrock.com/7/role/ShareholderFeesData", "http://www.blackrock.com/8/role/ShareholderFeesData", "http://www.blackrock.com/9/role/ShareholderFeesData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "Maximum Account Fee" } } }, "auth_ref": [ "r13" ] }, "oef_MaximumAccountFeeOverAssets": { "xbrltype": "nonNegativePure4ItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "MaximumAccountFeeOverAssets", "presentation": [ "http://www.blackrock.com/1/role/ShareholderFeesData", "http://www.blackrock.com/10/role/ShareholderFeesData", "http://www.blackrock.com/11/role/ShareholderFeesData", "http://www.blackrock.com/12/role/ShareholderFeesData", "http://www.blackrock.com/13/role/ShareholderFeesData", "http://www.blackrock.com/14/role/ShareholderFeesData", "http://www.blackrock.com/15/role/ShareholderFeesData", "http://www.blackrock.com/16/role/ShareholderFeesData", "http://www.blackrock.com/17/role/ShareholderFeesData", "http://www.blackrock.com/18/role/ShareholderFeesData", "http://www.blackrock.com/19/role/ShareholderFeesData", "http://www.blackrock.com/2/role/ShareholderFeesData", "http://www.blackrock.com/20/role/ShareholderFeesData", "http://www.blackrock.com/3/role/ShareholderFeesData", "http://www.blackrock.com/4/role/ShareholderFeesData", "http://www.blackrock.com/5/role/ShareholderFeesData", "http://www.blackrock.com/6/role/ShareholderFeesData", "http://www.blackrock.com/7/role/ShareholderFeesData", "http://www.blackrock.com/8/role/ShareholderFeesData", "http://www.blackrock.com/9/role/ShareholderFeesData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "Maximum Account Fee (as a percentage of Assets)" } } }, "auth_ref": [ "r13" ] }, "oef_MaximumCumulativeSalesChargeOverOfferingPrice": { "xbrltype": "nonNegativePure4ItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "MaximumCumulativeSalesChargeOverOfferingPrice", "presentation": [ "http://www.blackrock.com/1/role/ShareholderFeesData", "http://www.blackrock.com/10/role/ShareholderFeesData", "http://www.blackrock.com/11/role/ShareholderFeesData", "http://www.blackrock.com/12/role/ShareholderFeesData", "http://www.blackrock.com/13/role/ShareholderFeesData", "http://www.blackrock.com/14/role/ShareholderFeesData", "http://www.blackrock.com/15/role/ShareholderFeesData", "http://www.blackrock.com/16/role/ShareholderFeesData", "http://www.blackrock.com/17/role/ShareholderFeesData", "http://www.blackrock.com/18/role/ShareholderFeesData", "http://www.blackrock.com/19/role/ShareholderFeesData", "http://www.blackrock.com/2/role/ShareholderFeesData", "http://www.blackrock.com/20/role/ShareholderFeesData", "http://www.blackrock.com/3/role/ShareholderFeesData", "http://www.blackrock.com/4/role/ShareholderFeesData", "http://www.blackrock.com/5/role/ShareholderFeesData", "http://www.blackrock.com/6/role/ShareholderFeesData", "http://www.blackrock.com/7/role/ShareholderFeesData", "http://www.blackrock.com/8/role/ShareholderFeesData", "http://www.blackrock.com/9/role/ShareholderFeesData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "Maximum Cumulative Sales Charge (as a percentage of Offering Price)" } } }, "auth_ref": [ "r13" ] }, "oef_MaximumCumulativeSalesChargeOverOther": { "xbrltype": "nonNegativePure4ItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "MaximumCumulativeSalesChargeOverOther", "presentation": [ "http://www.blackrock.com/1/role/ShareholderFeesData", "http://www.blackrock.com/10/role/ShareholderFeesData", "http://www.blackrock.com/11/role/ShareholderFeesData", "http://www.blackrock.com/12/role/ShareholderFeesData", "http://www.blackrock.com/13/role/ShareholderFeesData", "http://www.blackrock.com/14/role/ShareholderFeesData", "http://www.blackrock.com/15/role/ShareholderFeesData", "http://www.blackrock.com/16/role/ShareholderFeesData", "http://www.blackrock.com/17/role/ShareholderFeesData", "http://www.blackrock.com/18/role/ShareholderFeesData", "http://www.blackrock.com/19/role/ShareholderFeesData", "http://www.blackrock.com/2/role/ShareholderFeesData", "http://www.blackrock.com/20/role/ShareholderFeesData", "http://www.blackrock.com/3/role/ShareholderFeesData", "http://www.blackrock.com/4/role/ShareholderFeesData", "http://www.blackrock.com/5/role/ShareholderFeesData", "http://www.blackrock.com/6/role/ShareholderFeesData", "http://www.blackrock.com/7/role/ShareholderFeesData", "http://www.blackrock.com/8/role/ShareholderFeesData", "http://www.blackrock.com/9/role/ShareholderFeesData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "Maximum Cumulative Sales Charge (as a percentage)" } } }, "auth_ref": [ "r13" ] }, "oef_MaximumDeferredSalesChargeOverOfferingPrice": { "xbrltype": "nonNegativePure4ItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "MaximumDeferredSalesChargeOverOfferingPrice", "presentation": [ "http://www.blackrock.com/1/role/ShareholderFeesData", "http://www.blackrock.com/10/role/ShareholderFeesData", "http://www.blackrock.com/11/role/ShareholderFeesData", "http://www.blackrock.com/12/role/ShareholderFeesData", "http://www.blackrock.com/13/role/ShareholderFeesData", "http://www.blackrock.com/14/role/ShareholderFeesData", "http://www.blackrock.com/15/role/ShareholderFeesData", "http://www.blackrock.com/16/role/ShareholderFeesData", "http://www.blackrock.com/17/role/ShareholderFeesData", "http://www.blackrock.com/18/role/ShareholderFeesData", "http://www.blackrock.com/19/role/ShareholderFeesData", "http://www.blackrock.com/2/role/ShareholderFeesData", "http://www.blackrock.com/20/role/ShareholderFeesData", "http://www.blackrock.com/3/role/ShareholderFeesData", "http://www.blackrock.com/4/role/ShareholderFeesData", "http://www.blackrock.com/5/role/ShareholderFeesData", "http://www.blackrock.com/6/role/ShareholderFeesData", "http://www.blackrock.com/7/role/ShareholderFeesData", "http://www.blackrock.com/8/role/ShareholderFeesData", "http://www.blackrock.com/9/role/ShareholderFeesData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "Maximum Deferred Sales Charge (as a percentage of Offering Price)" } } }, "auth_ref": [ "r13" ] }, "oef_MaximumDeferredSalesChargeOverOther": { "xbrltype": "nonNegativePure4ItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "MaximumDeferredSalesChargeOverOther", "presentation": [ "http://www.blackrock.com/1/role/ShareholderFeesData", "http://www.blackrock.com/10/role/ShareholderFeesData", "http://www.blackrock.com/11/role/ShareholderFeesData", "http://www.blackrock.com/12/role/ShareholderFeesData", "http://www.blackrock.com/13/role/ShareholderFeesData", "http://www.blackrock.com/14/role/ShareholderFeesData", "http://www.blackrock.com/15/role/ShareholderFeesData", "http://www.blackrock.com/16/role/ShareholderFeesData", "http://www.blackrock.com/17/role/ShareholderFeesData", "http://www.blackrock.com/18/role/ShareholderFeesData", "http://www.blackrock.com/19/role/ShareholderFeesData", "http://www.blackrock.com/2/role/ShareholderFeesData", "http://www.blackrock.com/20/role/ShareholderFeesData", "http://www.blackrock.com/3/role/ShareholderFeesData", "http://www.blackrock.com/4/role/ShareholderFeesData", "http://www.blackrock.com/5/role/ShareholderFeesData", "http://www.blackrock.com/6/role/ShareholderFeesData", "http://www.blackrock.com/7/role/ShareholderFeesData", "http://www.blackrock.com/8/role/ShareholderFeesData", "http://www.blackrock.com/9/role/ShareholderFeesData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "Maximum Deferred Sales Charge (as a percentage)" } } }, "auth_ref": [ "r13" ] }, "oef_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice": { "xbrltype": "nonNegativePure4ItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "MaximumSalesChargeImposedOnPurchasesOverOfferingPrice", "presentation": [ "http://www.blackrock.com/1/role/ShareholderFeesData", "http://www.blackrock.com/10/role/ShareholderFeesData", "http://www.blackrock.com/11/role/ShareholderFeesData", "http://www.blackrock.com/12/role/ShareholderFeesData", "http://www.blackrock.com/13/role/ShareholderFeesData", "http://www.blackrock.com/14/role/ShareholderFeesData", "http://www.blackrock.com/15/role/ShareholderFeesData", "http://www.blackrock.com/16/role/ShareholderFeesData", "http://www.blackrock.com/17/role/ShareholderFeesData", "http://www.blackrock.com/18/role/ShareholderFeesData", "http://www.blackrock.com/19/role/ShareholderFeesData", "http://www.blackrock.com/2/role/ShareholderFeesData", "http://www.blackrock.com/20/role/ShareholderFeesData", "http://www.blackrock.com/3/role/ShareholderFeesData", "http://www.blackrock.com/4/role/ShareholderFeesData", "http://www.blackrock.com/5/role/ShareholderFeesData", "http://www.blackrock.com/6/role/ShareholderFeesData", "http://www.blackrock.com/7/role/ShareholderFeesData", "http://www.blackrock.com/8/role/ShareholderFeesData", "http://www.blackrock.com/9/role/ShareholderFeesData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)" } } }, "auth_ref": [ "r13" ] }, "oef_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther": { "xbrltype": "nonNegativePure4ItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther", "presentation": [ "http://www.blackrock.com/1/role/ShareholderFeesData", "http://www.blackrock.com/10/role/ShareholderFeesData", "http://www.blackrock.com/11/role/ShareholderFeesData", "http://www.blackrock.com/12/role/ShareholderFeesData", "http://www.blackrock.com/13/role/ShareholderFeesData", "http://www.blackrock.com/14/role/ShareholderFeesData", "http://www.blackrock.com/15/role/ShareholderFeesData", "http://www.blackrock.com/16/role/ShareholderFeesData", "http://www.blackrock.com/17/role/ShareholderFeesData", "http://www.blackrock.com/18/role/ShareholderFeesData", "http://www.blackrock.com/19/role/ShareholderFeesData", "http://www.blackrock.com/2/role/ShareholderFeesData", "http://www.blackrock.com/20/role/ShareholderFeesData", "http://www.blackrock.com/3/role/ShareholderFeesData", "http://www.blackrock.com/4/role/ShareholderFeesData", "http://www.blackrock.com/5/role/ShareholderFeesData", "http://www.blackrock.com/6/role/ShareholderFeesData", "http://www.blackrock.com/7/role/ShareholderFeesData", "http://www.blackrock.com/8/role/ShareholderFeesData", "http://www.blackrock.com/9/role/ShareholderFeesData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage)" } } }, "auth_ref": [ "r13" ] }, "oef_MoneyMarketSevenDayTaxEquivalentYield": { "xbrltype": "pureItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "MoneyMarketSevenDayTaxEquivalentYield", "presentation": [ "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/9/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Money Market Seven Day Tax Equivalent Yield" } } }, "auth_ref": [ "r51" ] }, "oef_MoneyMarketSevenDayYield": { "xbrltype": "pureItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "MoneyMarketSevenDayYield", "presentation": [ "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/9/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Money Market Seven Day Yield" } } }, "auth_ref": [ "r51" ] }, "oef_MoneyMarketSevenDayYieldCaption": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "MoneyMarketSevenDayYieldCaption", "presentation": [ "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/9/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Money Market Seven Day Yield, Caption [Optional Text]" } } }, "auth_ref": [ "r51" ] }, "oef_MoneyMarketSevenDayYieldColumnName": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "MoneyMarketSevenDayYieldColumnName", "presentation": [ "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/9/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Money Market Seven Day Yield Column [Optional Text]" } } }, "auth_ref": [ "r51" ] }, "oef_MoneyMarketSevenDayYieldPhone": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "MoneyMarketSevenDayYieldPhone", "presentation": [ "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/9/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Money Market Seven Day Yield Phone" } } }, "auth_ref": [ "r52" ] }, "bf3_NationalClosedMarketTradingRiskMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "NationalClosedMarketTradingRiskMember", "presentation": [ "http://www.blackrock.com/1/role/InvestmentRisks", "http://www.blackrock.com/10/role/InvestmentRisks", "http://www.blackrock.com/11/role/InvestmentRisks", "http://www.blackrock.com/12/role/InvestmentRisks", "http://www.blackrock.com/13/role/InvestmentRisks", "http://www.blackrock.com/14/role/InvestmentRisks", "http://www.blackrock.com/15/role/InvestmentRisks", "http://www.blackrock.com/16/role/InvestmentRisks", "http://www.blackrock.com/17/role/InvestmentRisks", "http://www.blackrock.com/18/role/InvestmentRisks", "http://www.blackrock.com/19/role/InvestmentRisks", "http://www.blackrock.com/2/role/InvestmentRisks", "http://www.blackrock.com/20/role/InvestmentRisks", "http://www.blackrock.com/3/role/InvestmentRisks", "http://www.blackrock.com/4/role/InvestmentRisks", "http://www.blackrock.com/5/role/InvestmentRisks", "http://www.blackrock.com/6/role/InvestmentRisks", "http://www.blackrock.com/7/role/InvestmentRisks", "http://www.blackrock.com/8/role/InvestmentRisks", "http://www.blackrock.com/9/role/InvestmentRisks" ], "lang": { "en-us": { "role": { "label": "National Closed Market Trading Risk [Member]" } } }, "auth_ref": [] }, "oef_NetExpensesOverAssets": { "xbrltype": "nonNegativePure4ItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "NetExpensesOverAssets", "calculation": { "http://xbrl.sec.gov/rr/role/OperatingExpensesData": { "parentTag": null, "weight": null, "order": null, "root": true } }, "presentation": [ "http://www.blackrock.com/1/role/OperatingExpensesData", "http://www.blackrock.com/10/role/OperatingExpensesData", "http://www.blackrock.com/11/role/OperatingExpensesData", "http://www.blackrock.com/12/role/OperatingExpensesData", "http://www.blackrock.com/13/role/OperatingExpensesData", "http://www.blackrock.com/14/role/OperatingExpensesData", "http://www.blackrock.com/15/role/OperatingExpensesData", "http://www.blackrock.com/16/role/OperatingExpensesData", "http://www.blackrock.com/17/role/OperatingExpensesData", "http://www.blackrock.com/18/role/OperatingExpensesData", "http://www.blackrock.com/19/role/OperatingExpensesData", "http://www.blackrock.com/2/role/OperatingExpensesData", "http://www.blackrock.com/20/role/OperatingExpensesData", "http://www.blackrock.com/3/role/OperatingExpensesData", "http://www.blackrock.com/4/role/OperatingExpensesData", "http://www.blackrock.com/5/role/OperatingExpensesData", "http://www.blackrock.com/6/role/OperatingExpensesData", "http://www.blackrock.com/7/role/OperatingExpensesData", "http://www.blackrock.com/8/role/OperatingExpensesData", "http://www.blackrock.com/9/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/OperatingExpensesData" ], "lang": { "en-us": { "role": { "label": "Net Expenses (as a percentage of Assets)", "totalLabel": "Net Expenses" } } }, "auth_ref": [ "r17" ] }, "oef_ObjectiveHeading": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ObjectiveHeading", "presentation": [ "http://www.blackrock.com/1/role/RiskReturn", "http://www.blackrock.com/10/role/RiskReturn", "http://www.blackrock.com/11/role/RiskReturn", "http://www.blackrock.com/12/role/RiskReturn", "http://www.blackrock.com/13/role/RiskReturn", "http://www.blackrock.com/14/role/RiskReturn", "http://www.blackrock.com/15/role/RiskReturn", "http://www.blackrock.com/16/role/RiskReturn", "http://www.blackrock.com/17/role/RiskReturn", "http://www.blackrock.com/18/role/RiskReturn", "http://www.blackrock.com/19/role/RiskReturn", "http://www.blackrock.com/2/role/RiskReturn", "http://www.blackrock.com/20/role/RiskReturn", "http://www.blackrock.com/3/role/RiskReturn", "http://www.blackrock.com/4/role/RiskReturn", "http://www.blackrock.com/5/role/RiskReturn", "http://www.blackrock.com/6/role/RiskReturn", "http://www.blackrock.com/7/role/RiskReturn", "http://www.blackrock.com/8/role/RiskReturn", "http://www.blackrock.com/9/role/RiskReturn", "http://xbrl.sec.gov/rr/role/RiskReturn" ], "lang": { "en-us": { "role": { "label": "Objective [Heading]" } } }, "auth_ref": [ "r6" ] }, "oef_ObjectivePrimaryTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ObjectivePrimaryTextBlock", "presentation": [ "http://www.blackrock.com/1/role/RiskReturn", "http://www.blackrock.com/10/role/RiskReturn", "http://www.blackrock.com/11/role/RiskReturn", "http://www.blackrock.com/12/role/RiskReturn", "http://www.blackrock.com/13/role/RiskReturn", "http://www.blackrock.com/14/role/RiskReturn", "http://www.blackrock.com/15/role/RiskReturn", "http://www.blackrock.com/16/role/RiskReturn", "http://www.blackrock.com/17/role/RiskReturn", "http://www.blackrock.com/18/role/RiskReturn", "http://www.blackrock.com/19/role/RiskReturn", "http://www.blackrock.com/2/role/RiskReturn", "http://www.blackrock.com/20/role/RiskReturn", "http://www.blackrock.com/3/role/RiskReturn", "http://www.blackrock.com/4/role/RiskReturn", "http://www.blackrock.com/5/role/RiskReturn", "http://www.blackrock.com/6/role/RiskReturn", "http://www.blackrock.com/7/role/RiskReturn", "http://www.blackrock.com/8/role/RiskReturn", "http://www.blackrock.com/9/role/RiskReturn", "http://xbrl.sec.gov/rr/role/RiskReturn" ], "lang": { "en-us": { "role": { "label": "Objective, Primary [Text Block]" } } }, "auth_ref": [ "r6" ] }, "oef_ObjectiveSecondaryTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ObjectiveSecondaryTextBlock", "presentation": [ "http://www.blackrock.com/1/role/RiskReturn", "http://www.blackrock.com/10/role/RiskReturn", "http://www.blackrock.com/11/role/RiskReturn", "http://www.blackrock.com/12/role/RiskReturn", "http://www.blackrock.com/13/role/RiskReturn", "http://www.blackrock.com/14/role/RiskReturn", "http://www.blackrock.com/15/role/RiskReturn", "http://www.blackrock.com/16/role/RiskReturn", "http://www.blackrock.com/17/role/RiskReturn", "http://www.blackrock.com/18/role/RiskReturn", "http://www.blackrock.com/19/role/RiskReturn", "http://www.blackrock.com/2/role/RiskReturn", "http://www.blackrock.com/20/role/RiskReturn", "http://www.blackrock.com/3/role/RiskReturn", "http://www.blackrock.com/4/role/RiskReturn", "http://www.blackrock.com/5/role/RiskReturn", "http://www.blackrock.com/6/role/RiskReturn", "http://www.blackrock.com/7/role/RiskReturn", "http://www.blackrock.com/8/role/RiskReturn", "http://www.blackrock.com/9/role/RiskReturn", "http://xbrl.sec.gov/rr/role/RiskReturn" ], "lang": { "en-us": { "role": { "label": "Objective, Secondary [Text Block]" } } }, "auth_ref": [ "r6" ] }, "oef_OperatingExpensesCaption": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "OperatingExpensesCaption", "presentation": [ "http://www.blackrock.com/1/role/FeesAndExpenses", "http://www.blackrock.com/10/role/FeesAndExpenses", "http://www.blackrock.com/11/role/FeesAndExpenses", "http://www.blackrock.com/12/role/FeesAndExpenses", "http://www.blackrock.com/13/role/FeesAndExpenses", "http://www.blackrock.com/14/role/FeesAndExpenses", "http://www.blackrock.com/15/role/FeesAndExpenses", "http://www.blackrock.com/16/role/FeesAndExpenses", "http://www.blackrock.com/17/role/FeesAndExpenses", "http://www.blackrock.com/18/role/FeesAndExpenses", "http://www.blackrock.com/19/role/FeesAndExpenses", "http://www.blackrock.com/2/role/FeesAndExpenses", "http://www.blackrock.com/20/role/FeesAndExpenses", "http://www.blackrock.com/3/role/FeesAndExpenses", "http://www.blackrock.com/4/role/FeesAndExpenses", "http://www.blackrock.com/5/role/FeesAndExpenses", "http://www.blackrock.com/6/role/FeesAndExpenses", "http://www.blackrock.com/7/role/FeesAndExpenses", "http://www.blackrock.com/8/role/FeesAndExpenses", "http://www.blackrock.com/9/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/FeesAndExpenses" ], "lang": { "en-us": { "role": { "label": "Operating Expenses Caption [Optional Text]" } } }, "auth_ref": [ "r17" ] }, "oef_OperatingExpensesColumnName": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "OperatingExpensesColumnName", "presentation": [ "http://www.blackrock.com/1/role/OperatingExpensesData", "http://www.blackrock.com/10/role/OperatingExpensesData", "http://www.blackrock.com/11/role/OperatingExpensesData", "http://www.blackrock.com/12/role/OperatingExpensesData", "http://www.blackrock.com/13/role/OperatingExpensesData", "http://www.blackrock.com/14/role/OperatingExpensesData", "http://www.blackrock.com/15/role/OperatingExpensesData", "http://www.blackrock.com/16/role/OperatingExpensesData", "http://www.blackrock.com/17/role/OperatingExpensesData", "http://www.blackrock.com/18/role/OperatingExpensesData", "http://www.blackrock.com/19/role/OperatingExpensesData", "http://www.blackrock.com/2/role/OperatingExpensesData", "http://www.blackrock.com/20/role/OperatingExpensesData", "http://www.blackrock.com/3/role/OperatingExpensesData", "http://www.blackrock.com/4/role/OperatingExpensesData", "http://www.blackrock.com/5/role/OperatingExpensesData", "http://www.blackrock.com/6/role/OperatingExpensesData", "http://www.blackrock.com/7/role/OperatingExpensesData", "http://www.blackrock.com/8/role/OperatingExpensesData", "http://www.blackrock.com/9/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/OperatingExpensesData" ], "lang": { "en-us": { "role": { "label": "Operating Expenses Column [Optional Text]" } } }, "auth_ref": [ "r17" ] }, "bf3_OperationalAndTechnologyRisksMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "OperationalAndTechnologyRisksMember", "presentation": [ "http://www.blackrock.com/1/role/InvestmentRisks", "http://www.blackrock.com/10/role/InvestmentRisks", "http://www.blackrock.com/11/role/InvestmentRisks", "http://www.blackrock.com/12/role/InvestmentRisks", "http://www.blackrock.com/13/role/InvestmentRisks", "http://www.blackrock.com/14/role/InvestmentRisks", "http://www.blackrock.com/15/role/InvestmentRisks", "http://www.blackrock.com/16/role/InvestmentRisks", "http://www.blackrock.com/17/role/InvestmentRisks", "http://www.blackrock.com/18/role/InvestmentRisks", "http://www.blackrock.com/19/role/InvestmentRisks", "http://www.blackrock.com/2/role/InvestmentRisks", "http://www.blackrock.com/20/role/InvestmentRisks", "http://www.blackrock.com/3/role/InvestmentRisks", "http://www.blackrock.com/4/role/InvestmentRisks", "http://www.blackrock.com/5/role/InvestmentRisks", "http://www.blackrock.com/6/role/InvestmentRisks", "http://www.blackrock.com/7/role/InvestmentRisks", "http://www.blackrock.com/8/role/InvestmentRisks", "http://www.blackrock.com/9/role/InvestmentRisks" ], "lang": { "en-us": { "role": { "label": "Operational and Technology Risks [Member]" } } }, "auth_ref": [] }, "oef_OtherExpensesNewFundBasedOnEstimates": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "OtherExpensesNewFundBasedOnEstimates", "presentation": [ "http://www.blackrock.com/1/role/FeesAndExpenses", "http://www.blackrock.com/10/role/FeesAndExpenses", "http://www.blackrock.com/11/role/FeesAndExpenses", "http://www.blackrock.com/12/role/FeesAndExpenses", "http://www.blackrock.com/13/role/FeesAndExpenses", "http://www.blackrock.com/14/role/FeesAndExpenses", "http://www.blackrock.com/15/role/FeesAndExpenses", "http://www.blackrock.com/16/role/FeesAndExpenses", "http://www.blackrock.com/17/role/FeesAndExpenses", "http://www.blackrock.com/18/role/FeesAndExpenses", "http://www.blackrock.com/19/role/FeesAndExpenses", "http://www.blackrock.com/2/role/FeesAndExpenses", "http://www.blackrock.com/20/role/FeesAndExpenses", "http://www.blackrock.com/3/role/FeesAndExpenses", "http://www.blackrock.com/4/role/FeesAndExpenses", "http://www.blackrock.com/5/role/FeesAndExpenses", "http://www.blackrock.com/6/role/FeesAndExpenses", "http://www.blackrock.com/7/role/FeesAndExpenses", "http://www.blackrock.com/8/role/FeesAndExpenses", "http://www.blackrock.com/9/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/FeesAndExpenses" ], "lang": { "en-us": { "role": { "label": "Other Expenses, New Fund, Based on Estimates [Text]" } } }, "auth_ref": [ "r33" ] }, "oef_OtherExpensesOverAssets": { "xbrltype": "nonNegativePure4ItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "OtherExpensesOverAssets", "calculation": { "http://xbrl.sec.gov/rr/role/OperatingExpensesData": { "parentTag": "oef_ExpensesOverAssets", "weight": 1.0, "order": 4.0 } }, "presentation": [ "http://www.blackrock.com/1/role/OperatingExpensesData", "http://www.blackrock.com/10/role/OperatingExpensesData", "http://www.blackrock.com/11/role/OperatingExpensesData", "http://www.blackrock.com/12/role/OperatingExpensesData", "http://www.blackrock.com/13/role/OperatingExpensesData", "http://www.blackrock.com/14/role/OperatingExpensesData", "http://www.blackrock.com/15/role/OperatingExpensesData", "http://www.blackrock.com/16/role/OperatingExpensesData", "http://www.blackrock.com/17/role/OperatingExpensesData", "http://www.blackrock.com/18/role/OperatingExpensesData", "http://www.blackrock.com/19/role/OperatingExpensesData", "http://www.blackrock.com/2/role/OperatingExpensesData", "http://www.blackrock.com/20/role/OperatingExpensesData", "http://www.blackrock.com/3/role/OperatingExpensesData", "http://www.blackrock.com/4/role/OperatingExpensesData", "http://www.blackrock.com/5/role/OperatingExpensesData", "http://www.blackrock.com/6/role/OperatingExpensesData", "http://www.blackrock.com/7/role/OperatingExpensesData", "http://www.blackrock.com/8/role/OperatingExpensesData", "http://www.blackrock.com/9/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/OperatingExpensesData" ], "lang": { "en-us": { "role": { "label": "Other Expenses (as a percentage of Assets):", "totalLabel": "Other Expenses" } } }, "auth_ref": [ "r20" ] }, "bf3_PassiveInvestmentRiskMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "PassiveInvestmentRiskMember", "presentation": [ "http://www.blackrock.com/1/role/InvestmentRisks", "http://www.blackrock.com/10/role/InvestmentRisks", "http://www.blackrock.com/11/role/InvestmentRisks", "http://www.blackrock.com/12/role/InvestmentRisks", "http://www.blackrock.com/13/role/InvestmentRisks", "http://www.blackrock.com/14/role/InvestmentRisks", "http://www.blackrock.com/15/role/InvestmentRisks", "http://www.blackrock.com/16/role/InvestmentRisks", "http://www.blackrock.com/17/role/InvestmentRisks", "http://www.blackrock.com/18/role/InvestmentRisks", "http://www.blackrock.com/19/role/InvestmentRisks", "http://www.blackrock.com/2/role/InvestmentRisks", "http://www.blackrock.com/20/role/InvestmentRisks", "http://www.blackrock.com/3/role/InvestmentRisks", "http://www.blackrock.com/4/role/InvestmentRisks", "http://www.blackrock.com/5/role/InvestmentRisks", "http://www.blackrock.com/6/role/InvestmentRisks", "http://www.blackrock.com/7/role/InvestmentRisks", "http://www.blackrock.com/8/role/InvestmentRisks", "http://www.blackrock.com/9/role/InvestmentRisks" ], "lang": { "en-us": { "role": { "label": "Passive Investment Risk [Member]" } } }, "auth_ref": [] }, "oef_PerfInceptionDate": { "xbrltype": "dateItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "PerfInceptionDate", "presentation": [ "http://www.blackrock.com/1/role/PerformanceTableData", "http://www.blackrock.com/10/role/PerformanceTableData", "http://www.blackrock.com/11/role/PerformanceTableData", "http://www.blackrock.com/12/role/PerformanceTableData", "http://www.blackrock.com/13/role/PerformanceTableData", "http://www.blackrock.com/14/role/PerformanceTableData", "http://www.blackrock.com/15/role/PerformanceTableData", "http://www.blackrock.com/16/role/PerformanceTableData", "http://www.blackrock.com/17/role/PerformanceTableData", "http://www.blackrock.com/18/role/PerformanceTableData", "http://www.blackrock.com/19/role/PerformanceTableData", "http://www.blackrock.com/2/role/PerformanceTableData", "http://www.blackrock.com/20/role/PerformanceTableData", "http://www.blackrock.com/3/role/PerformanceTableData", "http://www.blackrock.com/4/role/PerformanceTableData", "http://www.blackrock.com/5/role/PerformanceTableData", "http://www.blackrock.com/6/role/PerformanceTableData", "http://www.blackrock.com/7/role/PerformanceTableData", "http://www.blackrock.com/8/role/PerformanceTableData", "http://www.blackrock.com/9/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "Performance Inception Date" } } }, "auth_ref": [ "r7" ] }, "oef_PerformanceAdditionalMarketIndex": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "PerformanceAdditionalMarketIndex", "presentation": [ "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/9/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Performance Additional Market Index [Text]" } } }, "auth_ref": [ "r43" ] }, "oef_PerformanceAvailabilityPhone": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "PerformanceAvailabilityPhone", "presentation": [ "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/9/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Performance Availability Phone [Text]" } } }, "auth_ref": [ "r43" ] }, "oef_PerformanceAvailabilityWebSiteAddress": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "PerformanceAvailabilityWebSiteAddress", "presentation": [ "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/9/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Performance Availability Website Address [Text]" } } }, "auth_ref": [ "r43" ] }, "oef_PerformanceInformationIllustratesVariabilityOfReturns": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "PerformanceInformationIllustratesVariabilityOfReturns", "presentation": [ "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/9/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Performance Information Illustrates Variability of Returns [Text]" } } }, "auth_ref": [ "r43" ] }, "oef_PerformanceMeasureAxis": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "PerformanceMeasureAxis", "presentation": [ "http://www.blackrock.com/1/role/PerformanceTableData", "http://www.blackrock.com/10/role/PerformanceTableData", "http://www.blackrock.com/11/role/PerformanceTableData", "http://www.blackrock.com/12/role/PerformanceTableData", "http://www.blackrock.com/13/role/PerformanceTableData", "http://www.blackrock.com/14/role/PerformanceTableData", "http://www.blackrock.com/15/role/PerformanceTableData", "http://www.blackrock.com/16/role/PerformanceTableData", "http://www.blackrock.com/17/role/PerformanceTableData", "http://www.blackrock.com/18/role/PerformanceTableData", "http://www.blackrock.com/19/role/PerformanceTableData", "http://www.blackrock.com/2/role/PerformanceTableData", "http://www.blackrock.com/20/role/PerformanceTableData", "http://www.blackrock.com/3/role/PerformanceTableData", "http://www.blackrock.com/4/role/PerformanceTableData", "http://www.blackrock.com/5/role/PerformanceTableData", "http://www.blackrock.com/6/role/PerformanceTableData", "http://www.blackrock.com/7/role/PerformanceTableData", "http://www.blackrock.com/8/role/PerformanceTableData", "http://www.blackrock.com/9/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "Performance Measure [Axis]" } } }, "auth_ref": [ "r48" ] }, "oef_PerformanceMeasureDomain": { "xbrltype": "domainItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "PerformanceMeasureDomain", "presentation": [ "http://www.blackrock.com/1/role/PerformanceTableData", "http://www.blackrock.com/10/role/PerformanceTableData", "http://www.blackrock.com/11/role/PerformanceTableData", "http://www.blackrock.com/12/role/PerformanceTableData", "http://www.blackrock.com/13/role/PerformanceTableData", "http://www.blackrock.com/14/role/PerformanceTableData", "http://www.blackrock.com/15/role/PerformanceTableData", "http://www.blackrock.com/16/role/PerformanceTableData", "http://www.blackrock.com/17/role/PerformanceTableData", "http://www.blackrock.com/18/role/PerformanceTableData", "http://www.blackrock.com/19/role/PerformanceTableData", "http://www.blackrock.com/2/role/PerformanceTableData", "http://www.blackrock.com/20/role/PerformanceTableData", "http://www.blackrock.com/3/role/PerformanceTableData", "http://www.blackrock.com/4/role/PerformanceTableData", "http://www.blackrock.com/5/role/PerformanceTableData", "http://www.blackrock.com/6/role/PerformanceTableData", "http://www.blackrock.com/7/role/PerformanceTableData", "http://www.blackrock.com/8/role/PerformanceTableData", "http://www.blackrock.com/9/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "label": "Before Taxes" } } }, "auth_ref": [ "r48" ] }, "oef_PerformanceNarrativeTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "PerformanceNarrativeTextBlock", "presentation": [ "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/9/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Performance Narrative [Text Block]" } } }, "auth_ref": [ "r43" ] }, "oef_PerformanceOneYearOrLess": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "PerformanceOneYearOrLess", "presentation": [ "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/9/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Performance One Year or Less [Text]" } } }, "auth_ref": [ "r43" ] }, "oef_PerformancePastDoesNotIndicateFuture": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "PerformancePastDoesNotIndicateFuture", "presentation": [ "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/9/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Performance Past Does Not Indicate Future [Text]" } } }, "auth_ref": [ "r8", "r43" ] }, "oef_PerformanceTableClosingTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "PerformanceTableClosingTextBlock", "presentation": [ "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/9/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Performance Table Closing [Text Block]" } } }, "auth_ref": [ "r48" ] }, "oef_PerformanceTableDoesReflectSalesLoads": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "PerformanceTableDoesReflectSalesLoads", "presentation": [ "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/9/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Performance Table Does Reflect Sales Loads" } } }, "auth_ref": [ "r53" ] }, "oef_PerformanceTableExplanationAfterTaxHigher": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "PerformanceTableExplanationAfterTaxHigher", "presentation": [ "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/9/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Performance Table Explanation after Tax Higher" } } }, "auth_ref": [ "r58" ] }, "oef_PerformanceTableFootnotesReasonPerformanceInformationForClassDifferentFromImmediatelyPrecedingPeriod": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "PerformanceTableFootnotesReasonPerformanceInformationForClassDifferentFromImmediatelyPrecedingPeriod", "presentation": [ "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/9/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Performance Table Footnotes, Reason Performance Information for Class Different from Immediately Preceding Period [Text]" } } }, "auth_ref": [ "r50" ] }, "oef_PerformanceTableFootnotesTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "PerformanceTableFootnotesTextBlock", "presentation": [ "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/9/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Performance Table Footnotes" } } }, "auth_ref": [ "r48" ] }, "oef_PerformanceTableHeading": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "PerformanceTableHeading", "presentation": [ "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/9/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Performance Table Heading" } } }, "auth_ref": [ "r48" ] }, "oef_PerformanceTableMarketIndexChanged": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "PerformanceTableMarketIndexChanged", "presentation": [ "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/9/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Performance Table Market Index Changed" } } }, "auth_ref": [ "r55" ] }, "oef_PerformanceTableNarrativeTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "PerformanceTableNarrativeTextBlock", "presentation": [ "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/9/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Performance Table Narrative" } } }, "auth_ref": [ "r53" ] }, "oef_PerformanceTableNotRelevantToTaxDeferred": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "PerformanceTableNotRelevantToTaxDeferred", "presentation": [ "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/9/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Performance Table Not Relevant to Tax Deferred" } } }, "auth_ref": [ "r57" ] }, "oef_PerformanceTableOneClassOfAfterTaxShown": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "PerformanceTableOneClassOfAfterTaxShown", "presentation": [ "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/9/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Performance Table One Class of after Tax Shown [Text]" } } }, "auth_ref": [ "r48", "r54" ] }, "oef_PerformanceTableTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "PerformanceTableTextBlock", "presentation": [ "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/9/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Performance [Table]" } } }, "auth_ref": [ "r48" ] }, "oef_PerformanceTableUsesHighestFederalRate": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "PerformanceTableUsesHighestFederalRate", "presentation": [ "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/9/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Performance Table Uses Highest Federal Rate" } } }, "auth_ref": [ "r56" ] }, "oef_PortfolioTurnoverHeading": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "PortfolioTurnoverHeading", "presentation": [ "http://www.blackrock.com/1/role/FeesAndExpenses", "http://www.blackrock.com/10/role/FeesAndExpenses", "http://www.blackrock.com/11/role/FeesAndExpenses", "http://www.blackrock.com/12/role/FeesAndExpenses", "http://www.blackrock.com/13/role/FeesAndExpenses", "http://www.blackrock.com/14/role/FeesAndExpenses", "http://www.blackrock.com/15/role/FeesAndExpenses", "http://www.blackrock.com/16/role/FeesAndExpenses", "http://www.blackrock.com/17/role/FeesAndExpenses", "http://www.blackrock.com/18/role/FeesAndExpenses", "http://www.blackrock.com/19/role/FeesAndExpenses", "http://www.blackrock.com/2/role/FeesAndExpenses", "http://www.blackrock.com/20/role/FeesAndExpenses", "http://www.blackrock.com/3/role/FeesAndExpenses", "http://www.blackrock.com/4/role/FeesAndExpenses", "http://www.blackrock.com/5/role/FeesAndExpenses", "http://www.blackrock.com/6/role/FeesAndExpenses", "http://www.blackrock.com/7/role/FeesAndExpenses", "http://www.blackrock.com/8/role/FeesAndExpenses", "http://www.blackrock.com/9/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/FeesAndExpenses" ], "lang": { "en-us": { "role": { "label": "Portfolio Turnover [Heading]" } } }, "auth_ref": [ "r32" ] }, "oef_PortfolioTurnoverRate": { "xbrltype": "pureItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "PortfolioTurnoverRate", "presentation": [ "http://www.blackrock.com/1/role/FeesAndExpenses", "http://www.blackrock.com/10/role/FeesAndExpenses", "http://www.blackrock.com/11/role/FeesAndExpenses", "http://www.blackrock.com/12/role/FeesAndExpenses", "http://www.blackrock.com/13/role/FeesAndExpenses", "http://www.blackrock.com/14/role/FeesAndExpenses", "http://www.blackrock.com/15/role/FeesAndExpenses", "http://www.blackrock.com/16/role/FeesAndExpenses", "http://www.blackrock.com/17/role/FeesAndExpenses", "http://www.blackrock.com/18/role/FeesAndExpenses", "http://www.blackrock.com/19/role/FeesAndExpenses", "http://www.blackrock.com/2/role/FeesAndExpenses", "http://www.blackrock.com/20/role/FeesAndExpenses", "http://www.blackrock.com/3/role/FeesAndExpenses", "http://www.blackrock.com/4/role/FeesAndExpenses", "http://www.blackrock.com/5/role/FeesAndExpenses", "http://www.blackrock.com/6/role/FeesAndExpenses", "http://www.blackrock.com/7/role/FeesAndExpenses", "http://www.blackrock.com/8/role/FeesAndExpenses", "http://www.blackrock.com/9/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/FeesAndExpenses" ], "lang": { "en-us": { "role": { "label": "Portfolio Turnover, Rate" } } }, "auth_ref": [ "r10", "r32" ] }, "oef_PortfolioTurnoverTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "PortfolioTurnoverTextBlock", "presentation": [ "http://www.blackrock.com/1/role/FeesAndExpenses", "http://www.blackrock.com/10/role/FeesAndExpenses", "http://www.blackrock.com/11/role/FeesAndExpenses", "http://www.blackrock.com/12/role/FeesAndExpenses", "http://www.blackrock.com/13/role/FeesAndExpenses", "http://www.blackrock.com/14/role/FeesAndExpenses", "http://www.blackrock.com/15/role/FeesAndExpenses", "http://www.blackrock.com/16/role/FeesAndExpenses", "http://www.blackrock.com/17/role/FeesAndExpenses", "http://www.blackrock.com/18/role/FeesAndExpenses", "http://www.blackrock.com/19/role/FeesAndExpenses", "http://www.blackrock.com/2/role/FeesAndExpenses", "http://www.blackrock.com/20/role/FeesAndExpenses", "http://www.blackrock.com/3/role/FeesAndExpenses", "http://www.blackrock.com/4/role/FeesAndExpenses", "http://www.blackrock.com/5/role/FeesAndExpenses", "http://www.blackrock.com/6/role/FeesAndExpenses", "http://www.blackrock.com/7/role/FeesAndExpenses", "http://www.blackrock.com/8/role/FeesAndExpenses", "http://www.blackrock.com/9/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/FeesAndExpenses" ], "lang": { "en-us": { "role": { "label": "Portfolio Turnover [Text Block]" } } }, "auth_ref": [ "r32" ] }, "oef_ProspectusDate": { "xbrltype": "dateItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ProspectusDate", "presentation": [ "http://www.blackrock.com/1/role/N1aCover", "http://www.blackrock.com/10/role/N1aCover", "http://www.blackrock.com/11/role/N1aCover", "http://www.blackrock.com/12/role/N1aCover", "http://www.blackrock.com/13/role/N1aCover", "http://www.blackrock.com/14/role/N1aCover", "http://www.blackrock.com/15/role/N1aCover", "http://www.blackrock.com/16/role/N1aCover", "http://www.blackrock.com/17/role/N1aCover", "http://www.blackrock.com/18/role/N1aCover", "http://www.blackrock.com/19/role/N1aCover", "http://www.blackrock.com/2/role/N1aCover", "http://www.blackrock.com/20/role/N1aCover", "http://www.blackrock.com/3/role/N1aCover", "http://www.blackrock.com/4/role/N1aCover", "http://www.blackrock.com/5/role/N1aCover", "http://www.blackrock.com/6/role/N1aCover", "http://www.blackrock.com/7/role/N1aCover", "http://www.blackrock.com/8/role/N1aCover", "http://www.blackrock.com/9/role/N1aCover", "http://xbrl.sec.gov/rr/role/N1aCover" ], "lang": { "en-us": { "role": { "label": "Prospectus Date" } } }, "auth_ref": [ "r5" ] }, "oef_ProspectusLineItems": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ProspectusLineItems", "presentation": [ "http://www.blackrock.com/1/role/BarChartData", "http://www.blackrock.com/1/role/ExpenseExample", "http://www.blackrock.com/1/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/1/role/FeesAndExpenses", "http://www.blackrock.com/1/role/InvestmentRisks", "http://www.blackrock.com/1/role/InvestmentStrategy", "http://www.blackrock.com/1/role/N1aCover", "http://www.blackrock.com/1/role/N1aSupplement", "http://www.blackrock.com/1/role/OperatingExpensesData", "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/1/role/PerformanceTableData", "http://www.blackrock.com/1/role/RiskReturn", "http://www.blackrock.com/1/role/ShareholderFeesData", "http://www.blackrock.com/10/role/BarChartData", "http://www.blackrock.com/10/role/ExpenseExample", "http://www.blackrock.com/10/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/10/role/FeesAndExpenses", "http://www.blackrock.com/10/role/InvestmentRisks", "http://www.blackrock.com/10/role/InvestmentStrategy", "http://www.blackrock.com/10/role/N1aCover", "http://www.blackrock.com/10/role/N1aSupplement", "http://www.blackrock.com/10/role/OperatingExpensesData", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/10/role/PerformanceTableData", "http://www.blackrock.com/10/role/RiskReturn", "http://www.blackrock.com/10/role/ShareholderFeesData", "http://www.blackrock.com/11/role/BarChartData", "http://www.blackrock.com/11/role/ExpenseExample", "http://www.blackrock.com/11/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/11/role/FeesAndExpenses", "http://www.blackrock.com/11/role/InvestmentRisks", "http://www.blackrock.com/11/role/InvestmentStrategy", "http://www.blackrock.com/11/role/N1aCover", "http://www.blackrock.com/11/role/N1aSupplement", "http://www.blackrock.com/11/role/OperatingExpensesData", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/11/role/PerformanceTableData", "http://www.blackrock.com/11/role/RiskReturn", "http://www.blackrock.com/11/role/ShareholderFeesData", "http://www.blackrock.com/12/role/BarChartData", "http://www.blackrock.com/12/role/ExpenseExample", "http://www.blackrock.com/12/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/12/role/FeesAndExpenses", "http://www.blackrock.com/12/role/InvestmentRisks", "http://www.blackrock.com/12/role/InvestmentStrategy", "http://www.blackrock.com/12/role/N1aCover", "http://www.blackrock.com/12/role/N1aSupplement", "http://www.blackrock.com/12/role/OperatingExpensesData", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/12/role/PerformanceTableData", "http://www.blackrock.com/12/role/RiskReturn", "http://www.blackrock.com/12/role/ShareholderFeesData", "http://www.blackrock.com/13/role/BarChartData", "http://www.blackrock.com/13/role/ExpenseExample", "http://www.blackrock.com/13/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/13/role/FeesAndExpenses", "http://www.blackrock.com/13/role/InvestmentRisks", "http://www.blackrock.com/13/role/InvestmentStrategy", "http://www.blackrock.com/13/role/N1aCover", "http://www.blackrock.com/13/role/N1aSupplement", "http://www.blackrock.com/13/role/OperatingExpensesData", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/13/role/PerformanceTableData", "http://www.blackrock.com/13/role/RiskReturn", "http://www.blackrock.com/13/role/ShareholderFeesData", "http://www.blackrock.com/14/role/BarChartData", "http://www.blackrock.com/14/role/ExpenseExample", "http://www.blackrock.com/14/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/14/role/FeesAndExpenses", "http://www.blackrock.com/14/role/InvestmentRisks", "http://www.blackrock.com/14/role/InvestmentStrategy", "http://www.blackrock.com/14/role/N1aCover", "http://www.blackrock.com/14/role/N1aSupplement", "http://www.blackrock.com/14/role/OperatingExpensesData", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/14/role/PerformanceTableData", "http://www.blackrock.com/14/role/RiskReturn", "http://www.blackrock.com/14/role/ShareholderFeesData", "http://www.blackrock.com/15/role/BarChartData", "http://www.blackrock.com/15/role/ExpenseExample", "http://www.blackrock.com/15/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/15/role/FeesAndExpenses", "http://www.blackrock.com/15/role/InvestmentRisks", "http://www.blackrock.com/15/role/InvestmentStrategy", "http://www.blackrock.com/15/role/N1aCover", "http://www.blackrock.com/15/role/N1aSupplement", "http://www.blackrock.com/15/role/OperatingExpensesData", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/15/role/PerformanceTableData", "http://www.blackrock.com/15/role/RiskReturn", "http://www.blackrock.com/15/role/ShareholderFeesData", "http://www.blackrock.com/16/role/BarChartData", "http://www.blackrock.com/16/role/ExpenseExample", "http://www.blackrock.com/16/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/16/role/FeesAndExpenses", "http://www.blackrock.com/16/role/InvestmentRisks", "http://www.blackrock.com/16/role/InvestmentStrategy", "http://www.blackrock.com/16/role/N1aCover", "http://www.blackrock.com/16/role/N1aSupplement", "http://www.blackrock.com/16/role/OperatingExpensesData", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/16/role/PerformanceTableData", "http://www.blackrock.com/16/role/RiskReturn", "http://www.blackrock.com/16/role/ShareholderFeesData", "http://www.blackrock.com/17/role/BarChartData", "http://www.blackrock.com/17/role/ExpenseExample", "http://www.blackrock.com/17/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/17/role/FeesAndExpenses", "http://www.blackrock.com/17/role/InvestmentRisks", "http://www.blackrock.com/17/role/InvestmentStrategy", "http://www.blackrock.com/17/role/N1aCover", "http://www.blackrock.com/17/role/N1aSupplement", "http://www.blackrock.com/17/role/OperatingExpensesData", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/17/role/PerformanceTableData", "http://www.blackrock.com/17/role/RiskReturn", "http://www.blackrock.com/17/role/ShareholderFeesData", "http://www.blackrock.com/18/role/BarChartData", "http://www.blackrock.com/18/role/ExpenseExample", "http://www.blackrock.com/18/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/18/role/FeesAndExpenses", "http://www.blackrock.com/18/role/InvestmentRisks", "http://www.blackrock.com/18/role/InvestmentStrategy", "http://www.blackrock.com/18/role/N1aCover", "http://www.blackrock.com/18/role/N1aSupplement", "http://www.blackrock.com/18/role/OperatingExpensesData", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/18/role/PerformanceTableData", "http://www.blackrock.com/18/role/RiskReturn", "http://www.blackrock.com/18/role/ShareholderFeesData", "http://www.blackrock.com/19/role/BarChartData", "http://www.blackrock.com/19/role/ExpenseExample", "http://www.blackrock.com/19/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/19/role/FeesAndExpenses", "http://www.blackrock.com/19/role/InvestmentRisks", "http://www.blackrock.com/19/role/InvestmentStrategy", "http://www.blackrock.com/19/role/N1aCover", "http://www.blackrock.com/19/role/N1aSupplement", "http://www.blackrock.com/19/role/OperatingExpensesData", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/19/role/PerformanceTableData", "http://www.blackrock.com/19/role/RiskReturn", "http://www.blackrock.com/19/role/ShareholderFeesData", "http://www.blackrock.com/2/role/BarChartData", "http://www.blackrock.com/2/role/ExpenseExample", "http://www.blackrock.com/2/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/2/role/FeesAndExpenses", "http://www.blackrock.com/2/role/InvestmentRisks", "http://www.blackrock.com/2/role/InvestmentStrategy", "http://www.blackrock.com/2/role/N1aCover", "http://www.blackrock.com/2/role/N1aSupplement", "http://www.blackrock.com/2/role/OperatingExpensesData", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/2/role/PerformanceTableData", "http://www.blackrock.com/2/role/RiskReturn", "http://www.blackrock.com/2/role/ShareholderFeesData", "http://www.blackrock.com/20/role/BarChartData", "http://www.blackrock.com/20/role/ExpenseExample", "http://www.blackrock.com/20/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/20/role/FeesAndExpenses", "http://www.blackrock.com/20/role/InvestmentRisks", "http://www.blackrock.com/20/role/InvestmentStrategy", "http://www.blackrock.com/20/role/N1aCover", "http://www.blackrock.com/20/role/N1aSupplement", "http://www.blackrock.com/20/role/OperatingExpensesData", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/20/role/PerformanceTableData", "http://www.blackrock.com/20/role/RiskReturn", "http://www.blackrock.com/20/role/ShareholderFeesData", "http://www.blackrock.com/3/role/BarChartData", "http://www.blackrock.com/3/role/ExpenseExample", "http://www.blackrock.com/3/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/3/role/FeesAndExpenses", "http://www.blackrock.com/3/role/InvestmentRisks", "http://www.blackrock.com/3/role/InvestmentStrategy", "http://www.blackrock.com/3/role/N1aCover", "http://www.blackrock.com/3/role/N1aSupplement", "http://www.blackrock.com/3/role/OperatingExpensesData", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/3/role/PerformanceTableData", "http://www.blackrock.com/3/role/RiskReturn", "http://www.blackrock.com/3/role/ShareholderFeesData", "http://www.blackrock.com/4/role/BarChartData", "http://www.blackrock.com/4/role/ExpenseExample", "http://www.blackrock.com/4/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/4/role/FeesAndExpenses", "http://www.blackrock.com/4/role/InvestmentRisks", "http://www.blackrock.com/4/role/InvestmentStrategy", "http://www.blackrock.com/4/role/N1aCover", "http://www.blackrock.com/4/role/N1aSupplement", "http://www.blackrock.com/4/role/OperatingExpensesData", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/4/role/PerformanceTableData", "http://www.blackrock.com/4/role/RiskReturn", "http://www.blackrock.com/4/role/ShareholderFeesData", "http://www.blackrock.com/5/role/BarChartData", "http://www.blackrock.com/5/role/ExpenseExample", "http://www.blackrock.com/5/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/5/role/FeesAndExpenses", "http://www.blackrock.com/5/role/InvestmentRisks", "http://www.blackrock.com/5/role/InvestmentStrategy", "http://www.blackrock.com/5/role/N1aCover", "http://www.blackrock.com/5/role/N1aSupplement", "http://www.blackrock.com/5/role/OperatingExpensesData", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/5/role/PerformanceTableData", "http://www.blackrock.com/5/role/RiskReturn", "http://www.blackrock.com/5/role/ShareholderFeesData", "http://www.blackrock.com/6/role/BarChartData", "http://www.blackrock.com/6/role/ExpenseExample", "http://www.blackrock.com/6/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/6/role/FeesAndExpenses", "http://www.blackrock.com/6/role/InvestmentRisks", "http://www.blackrock.com/6/role/InvestmentStrategy", "http://www.blackrock.com/6/role/N1aCover", "http://www.blackrock.com/6/role/N1aSupplement", "http://www.blackrock.com/6/role/OperatingExpensesData", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/6/role/PerformanceTableData", "http://www.blackrock.com/6/role/RiskReturn", "http://www.blackrock.com/6/role/ShareholderFeesData", "http://www.blackrock.com/7/role/BarChartData", "http://www.blackrock.com/7/role/ExpenseExample", "http://www.blackrock.com/7/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/7/role/FeesAndExpenses", "http://www.blackrock.com/7/role/InvestmentRisks", "http://www.blackrock.com/7/role/InvestmentStrategy", "http://www.blackrock.com/7/role/N1aCover", "http://www.blackrock.com/7/role/N1aSupplement", "http://www.blackrock.com/7/role/OperatingExpensesData", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/7/role/PerformanceTableData", "http://www.blackrock.com/7/role/RiskReturn", "http://www.blackrock.com/7/role/ShareholderFeesData", "http://www.blackrock.com/8/role/BarChartData", "http://www.blackrock.com/8/role/ExpenseExample", "http://www.blackrock.com/8/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/8/role/FeesAndExpenses", "http://www.blackrock.com/8/role/InvestmentRisks", "http://www.blackrock.com/8/role/InvestmentStrategy", "http://www.blackrock.com/8/role/N1aCover", "http://www.blackrock.com/8/role/N1aSupplement", "http://www.blackrock.com/8/role/OperatingExpensesData", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/8/role/PerformanceTableData", "http://www.blackrock.com/8/role/RiskReturn", "http://www.blackrock.com/8/role/ShareholderFeesData", "http://www.blackrock.com/9/role/BarChartData", "http://www.blackrock.com/9/role/ExpenseExample", "http://www.blackrock.com/9/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/9/role/FeesAndExpenses", "http://www.blackrock.com/9/role/InvestmentRisks", "http://www.blackrock.com/9/role/InvestmentStrategy", "http://www.blackrock.com/9/role/N1aCover", "http://www.blackrock.com/9/role/N1aSupplement", "http://www.blackrock.com/9/role/OperatingExpensesData", "http://www.blackrock.com/9/role/PerformanceManagement", "http://www.blackrock.com/9/role/PerformanceTableData", "http://www.blackrock.com/9/role/RiskReturn", "http://www.blackrock.com/9/role/ShareholderFeesData", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/InvestmentRisks", "http://xbrl.sec.gov/rr/role/InvestmentStrategy", "http://xbrl.sec.gov/rr/role/N1aCover", "http://xbrl.sec.gov/rr/role/N1aSupplement", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/RiskReturn", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "Prospectus [Line Items]" } } }, "auth_ref": [ "r3" ] }, "oef_ProspectusTable": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ProspectusTable", "presentation": [ "http://www.blackrock.com/1/role/BarChartData", "http://www.blackrock.com/1/role/ExpenseExample", "http://www.blackrock.com/1/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/1/role/FeesAndExpenses", "http://www.blackrock.com/1/role/InvestmentRisks", "http://www.blackrock.com/1/role/InvestmentStrategy", "http://www.blackrock.com/1/role/N1aCover", "http://www.blackrock.com/1/role/N1aSupplement", "http://www.blackrock.com/1/role/OperatingExpensesData", "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/1/role/PerformanceTableData", "http://www.blackrock.com/1/role/RiskReturn", "http://www.blackrock.com/1/role/ShareholderFeesData", "http://www.blackrock.com/10/role/BarChartData", "http://www.blackrock.com/10/role/ExpenseExample", "http://www.blackrock.com/10/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/10/role/FeesAndExpenses", "http://www.blackrock.com/10/role/InvestmentRisks", "http://www.blackrock.com/10/role/InvestmentStrategy", "http://www.blackrock.com/10/role/N1aCover", "http://www.blackrock.com/10/role/N1aSupplement", "http://www.blackrock.com/10/role/OperatingExpensesData", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/10/role/PerformanceTableData", "http://www.blackrock.com/10/role/RiskReturn", "http://www.blackrock.com/10/role/ShareholderFeesData", "http://www.blackrock.com/11/role/BarChartData", "http://www.blackrock.com/11/role/ExpenseExample", "http://www.blackrock.com/11/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/11/role/FeesAndExpenses", "http://www.blackrock.com/11/role/InvestmentRisks", "http://www.blackrock.com/11/role/InvestmentStrategy", "http://www.blackrock.com/11/role/N1aCover", "http://www.blackrock.com/11/role/N1aSupplement", "http://www.blackrock.com/11/role/OperatingExpensesData", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/11/role/PerformanceTableData", "http://www.blackrock.com/11/role/RiskReturn", "http://www.blackrock.com/11/role/ShareholderFeesData", "http://www.blackrock.com/12/role/BarChartData", "http://www.blackrock.com/12/role/ExpenseExample", "http://www.blackrock.com/12/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/12/role/FeesAndExpenses", "http://www.blackrock.com/12/role/InvestmentRisks", "http://www.blackrock.com/12/role/InvestmentStrategy", "http://www.blackrock.com/12/role/N1aCover", "http://www.blackrock.com/12/role/N1aSupplement", "http://www.blackrock.com/12/role/OperatingExpensesData", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/12/role/PerformanceTableData", "http://www.blackrock.com/12/role/RiskReturn", "http://www.blackrock.com/12/role/ShareholderFeesData", "http://www.blackrock.com/13/role/BarChartData", "http://www.blackrock.com/13/role/ExpenseExample", "http://www.blackrock.com/13/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/13/role/FeesAndExpenses", "http://www.blackrock.com/13/role/InvestmentRisks", "http://www.blackrock.com/13/role/InvestmentStrategy", "http://www.blackrock.com/13/role/N1aCover", "http://www.blackrock.com/13/role/N1aSupplement", "http://www.blackrock.com/13/role/OperatingExpensesData", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/13/role/PerformanceTableData", "http://www.blackrock.com/13/role/RiskReturn", "http://www.blackrock.com/13/role/ShareholderFeesData", "http://www.blackrock.com/14/role/BarChartData", "http://www.blackrock.com/14/role/ExpenseExample", "http://www.blackrock.com/14/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/14/role/FeesAndExpenses", "http://www.blackrock.com/14/role/InvestmentRisks", "http://www.blackrock.com/14/role/InvestmentStrategy", "http://www.blackrock.com/14/role/N1aCover", "http://www.blackrock.com/14/role/N1aSupplement", "http://www.blackrock.com/14/role/OperatingExpensesData", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/14/role/PerformanceTableData", "http://www.blackrock.com/14/role/RiskReturn", "http://www.blackrock.com/14/role/ShareholderFeesData", "http://www.blackrock.com/15/role/BarChartData", "http://www.blackrock.com/15/role/ExpenseExample", "http://www.blackrock.com/15/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/15/role/FeesAndExpenses", "http://www.blackrock.com/15/role/InvestmentRisks", "http://www.blackrock.com/15/role/InvestmentStrategy", "http://www.blackrock.com/15/role/N1aCover", "http://www.blackrock.com/15/role/N1aSupplement", "http://www.blackrock.com/15/role/OperatingExpensesData", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/15/role/PerformanceTableData", "http://www.blackrock.com/15/role/RiskReturn", "http://www.blackrock.com/15/role/ShareholderFeesData", "http://www.blackrock.com/16/role/BarChartData", "http://www.blackrock.com/16/role/ExpenseExample", "http://www.blackrock.com/16/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/16/role/FeesAndExpenses", "http://www.blackrock.com/16/role/InvestmentRisks", "http://www.blackrock.com/16/role/InvestmentStrategy", "http://www.blackrock.com/16/role/N1aCover", "http://www.blackrock.com/16/role/N1aSupplement", "http://www.blackrock.com/16/role/OperatingExpensesData", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/16/role/PerformanceTableData", "http://www.blackrock.com/16/role/RiskReturn", "http://www.blackrock.com/16/role/ShareholderFeesData", "http://www.blackrock.com/17/role/BarChartData", "http://www.blackrock.com/17/role/ExpenseExample", "http://www.blackrock.com/17/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/17/role/FeesAndExpenses", "http://www.blackrock.com/17/role/InvestmentRisks", "http://www.blackrock.com/17/role/InvestmentStrategy", "http://www.blackrock.com/17/role/N1aCover", "http://www.blackrock.com/17/role/N1aSupplement", "http://www.blackrock.com/17/role/OperatingExpensesData", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/17/role/PerformanceTableData", "http://www.blackrock.com/17/role/RiskReturn", "http://www.blackrock.com/17/role/ShareholderFeesData", "http://www.blackrock.com/18/role/BarChartData", "http://www.blackrock.com/18/role/ExpenseExample", "http://www.blackrock.com/18/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/18/role/FeesAndExpenses", "http://www.blackrock.com/18/role/InvestmentRisks", "http://www.blackrock.com/18/role/InvestmentStrategy", "http://www.blackrock.com/18/role/N1aCover", "http://www.blackrock.com/18/role/N1aSupplement", "http://www.blackrock.com/18/role/OperatingExpensesData", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/18/role/PerformanceTableData", "http://www.blackrock.com/18/role/RiskReturn", "http://www.blackrock.com/18/role/ShareholderFeesData", "http://www.blackrock.com/19/role/BarChartData", "http://www.blackrock.com/19/role/ExpenseExample", "http://www.blackrock.com/19/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/19/role/FeesAndExpenses", "http://www.blackrock.com/19/role/InvestmentRisks", "http://www.blackrock.com/19/role/InvestmentStrategy", "http://www.blackrock.com/19/role/N1aCover", "http://www.blackrock.com/19/role/N1aSupplement", "http://www.blackrock.com/19/role/OperatingExpensesData", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/19/role/PerformanceTableData", "http://www.blackrock.com/19/role/RiskReturn", "http://www.blackrock.com/19/role/ShareholderFeesData", "http://www.blackrock.com/2/role/BarChartData", "http://www.blackrock.com/2/role/ExpenseExample", "http://www.blackrock.com/2/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/2/role/FeesAndExpenses", "http://www.blackrock.com/2/role/InvestmentRisks", "http://www.blackrock.com/2/role/InvestmentStrategy", "http://www.blackrock.com/2/role/N1aCover", "http://www.blackrock.com/2/role/N1aSupplement", "http://www.blackrock.com/2/role/OperatingExpensesData", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/2/role/PerformanceTableData", "http://www.blackrock.com/2/role/RiskReturn", "http://www.blackrock.com/2/role/ShareholderFeesData", "http://www.blackrock.com/20/role/BarChartData", "http://www.blackrock.com/20/role/ExpenseExample", "http://www.blackrock.com/20/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/20/role/FeesAndExpenses", "http://www.blackrock.com/20/role/InvestmentRisks", "http://www.blackrock.com/20/role/InvestmentStrategy", "http://www.blackrock.com/20/role/N1aCover", "http://www.blackrock.com/20/role/N1aSupplement", "http://www.blackrock.com/20/role/OperatingExpensesData", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/20/role/PerformanceTableData", "http://www.blackrock.com/20/role/RiskReturn", "http://www.blackrock.com/20/role/ShareholderFeesData", "http://www.blackrock.com/3/role/BarChartData", "http://www.blackrock.com/3/role/ExpenseExample", "http://www.blackrock.com/3/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/3/role/FeesAndExpenses", "http://www.blackrock.com/3/role/InvestmentRisks", "http://www.blackrock.com/3/role/InvestmentStrategy", "http://www.blackrock.com/3/role/N1aCover", "http://www.blackrock.com/3/role/N1aSupplement", "http://www.blackrock.com/3/role/OperatingExpensesData", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/3/role/PerformanceTableData", "http://www.blackrock.com/3/role/RiskReturn", "http://www.blackrock.com/3/role/ShareholderFeesData", "http://www.blackrock.com/4/role/BarChartData", "http://www.blackrock.com/4/role/ExpenseExample", "http://www.blackrock.com/4/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/4/role/FeesAndExpenses", "http://www.blackrock.com/4/role/InvestmentRisks", "http://www.blackrock.com/4/role/InvestmentStrategy", "http://www.blackrock.com/4/role/N1aCover", "http://www.blackrock.com/4/role/N1aSupplement", "http://www.blackrock.com/4/role/OperatingExpensesData", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/4/role/PerformanceTableData", "http://www.blackrock.com/4/role/RiskReturn", "http://www.blackrock.com/4/role/ShareholderFeesData", "http://www.blackrock.com/5/role/BarChartData", "http://www.blackrock.com/5/role/ExpenseExample", "http://www.blackrock.com/5/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/5/role/FeesAndExpenses", "http://www.blackrock.com/5/role/InvestmentRisks", "http://www.blackrock.com/5/role/InvestmentStrategy", "http://www.blackrock.com/5/role/N1aCover", "http://www.blackrock.com/5/role/N1aSupplement", "http://www.blackrock.com/5/role/OperatingExpensesData", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/5/role/PerformanceTableData", "http://www.blackrock.com/5/role/RiskReturn", "http://www.blackrock.com/5/role/ShareholderFeesData", "http://www.blackrock.com/6/role/BarChartData", "http://www.blackrock.com/6/role/ExpenseExample", "http://www.blackrock.com/6/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/6/role/FeesAndExpenses", "http://www.blackrock.com/6/role/InvestmentRisks", "http://www.blackrock.com/6/role/InvestmentStrategy", "http://www.blackrock.com/6/role/N1aCover", "http://www.blackrock.com/6/role/N1aSupplement", "http://www.blackrock.com/6/role/OperatingExpensesData", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/6/role/PerformanceTableData", "http://www.blackrock.com/6/role/RiskReturn", "http://www.blackrock.com/6/role/ShareholderFeesData", "http://www.blackrock.com/7/role/BarChartData", "http://www.blackrock.com/7/role/ExpenseExample", "http://www.blackrock.com/7/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/7/role/FeesAndExpenses", "http://www.blackrock.com/7/role/InvestmentRisks", "http://www.blackrock.com/7/role/InvestmentStrategy", "http://www.blackrock.com/7/role/N1aCover", "http://www.blackrock.com/7/role/N1aSupplement", "http://www.blackrock.com/7/role/OperatingExpensesData", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/7/role/PerformanceTableData", "http://www.blackrock.com/7/role/RiskReturn", "http://www.blackrock.com/7/role/ShareholderFeesData", "http://www.blackrock.com/8/role/BarChartData", "http://www.blackrock.com/8/role/ExpenseExample", "http://www.blackrock.com/8/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/8/role/FeesAndExpenses", "http://www.blackrock.com/8/role/InvestmentRisks", "http://www.blackrock.com/8/role/InvestmentStrategy", "http://www.blackrock.com/8/role/N1aCover", "http://www.blackrock.com/8/role/N1aSupplement", "http://www.blackrock.com/8/role/OperatingExpensesData", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/8/role/PerformanceTableData", "http://www.blackrock.com/8/role/RiskReturn", "http://www.blackrock.com/8/role/ShareholderFeesData", "http://www.blackrock.com/9/role/BarChartData", "http://www.blackrock.com/9/role/ExpenseExample", "http://www.blackrock.com/9/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/9/role/FeesAndExpenses", "http://www.blackrock.com/9/role/InvestmentRisks", "http://www.blackrock.com/9/role/InvestmentStrategy", "http://www.blackrock.com/9/role/N1aCover", "http://www.blackrock.com/9/role/N1aSupplement", "http://www.blackrock.com/9/role/OperatingExpensesData", "http://www.blackrock.com/9/role/PerformanceManagement", "http://www.blackrock.com/9/role/PerformanceTableData", "http://www.blackrock.com/9/role/RiskReturn", "http://www.blackrock.com/9/role/ShareholderFeesData", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/InvestmentRisks", "http://xbrl.sec.gov/rr/role/InvestmentStrategy", "http://xbrl.sec.gov/rr/role/N1aCover", "http://xbrl.sec.gov/rr/role/N1aSupplement", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/RiskReturn", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "Prospectus [Table]" } } }, "auth_ref": [ "r3" ] }, "bf3_REITInvestmentRiskMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "REITInvestmentRiskMember", "presentation": [ "http://www.blackrock.com/1/role/InvestmentRisks", "http://www.blackrock.com/10/role/InvestmentRisks", "http://www.blackrock.com/11/role/InvestmentRisks", "http://www.blackrock.com/12/role/InvestmentRisks", "http://www.blackrock.com/13/role/InvestmentRisks", "http://www.blackrock.com/14/role/InvestmentRisks", "http://www.blackrock.com/15/role/InvestmentRisks", "http://www.blackrock.com/16/role/InvestmentRisks", "http://www.blackrock.com/17/role/InvestmentRisks", "http://www.blackrock.com/18/role/InvestmentRisks", "http://www.blackrock.com/19/role/InvestmentRisks", "http://www.blackrock.com/2/role/InvestmentRisks", "http://www.blackrock.com/20/role/InvestmentRisks", "http://www.blackrock.com/3/role/InvestmentRisks", "http://www.blackrock.com/4/role/InvestmentRisks", "http://www.blackrock.com/5/role/InvestmentRisks", "http://www.blackrock.com/6/role/InvestmentRisks", "http://www.blackrock.com/7/role/InvestmentRisks", "http://www.blackrock.com/8/role/InvestmentRisks", "http://www.blackrock.com/9/role/InvestmentRisks" ], "lang": { "en-us": { "role": { "label": "REIT Investment Risk [Member]" } } }, "auth_ref": [] }, "bf3_RealEstateRelatedSecuritiesRiskMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "RealEstateRelatedSecuritiesRiskMember", "presentation": [ "http://www.blackrock.com/1/role/InvestmentRisks", "http://www.blackrock.com/10/role/InvestmentRisks", "http://www.blackrock.com/11/role/InvestmentRisks", "http://www.blackrock.com/12/role/InvestmentRisks", "http://www.blackrock.com/13/role/InvestmentRisks", "http://www.blackrock.com/14/role/InvestmentRisks", "http://www.blackrock.com/15/role/InvestmentRisks", "http://www.blackrock.com/16/role/InvestmentRisks", "http://www.blackrock.com/17/role/InvestmentRisks", "http://www.blackrock.com/18/role/InvestmentRisks", "http://www.blackrock.com/19/role/InvestmentRisks", "http://www.blackrock.com/2/role/InvestmentRisks", "http://www.blackrock.com/20/role/InvestmentRisks", "http://www.blackrock.com/3/role/InvestmentRisks", "http://www.blackrock.com/4/role/InvestmentRisks", "http://www.blackrock.com/5/role/InvestmentRisks", "http://www.blackrock.com/6/role/InvestmentRisks", "http://www.blackrock.com/7/role/InvestmentRisks", "http://www.blackrock.com/8/role/InvestmentRisks", "http://www.blackrock.com/9/role/InvestmentRisks" ], "lang": { "en-us": { "role": { "label": "Real Estate Related Securities Risk [Member]" } } }, "auth_ref": [] }, "oef_RedemptionFee": { "xbrltype": "nonPositiveMonetaryItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "RedemptionFee", "presentation": [ "http://www.blackrock.com/1/role/ShareholderFeesData", "http://www.blackrock.com/10/role/ShareholderFeesData", "http://www.blackrock.com/11/role/ShareholderFeesData", "http://www.blackrock.com/12/role/ShareholderFeesData", "http://www.blackrock.com/13/role/ShareholderFeesData", "http://www.blackrock.com/14/role/ShareholderFeesData", "http://www.blackrock.com/15/role/ShareholderFeesData", "http://www.blackrock.com/16/role/ShareholderFeesData", "http://www.blackrock.com/17/role/ShareholderFeesData", "http://www.blackrock.com/18/role/ShareholderFeesData", "http://www.blackrock.com/19/role/ShareholderFeesData", "http://www.blackrock.com/2/role/ShareholderFeesData", "http://www.blackrock.com/20/role/ShareholderFeesData", "http://www.blackrock.com/3/role/ShareholderFeesData", "http://www.blackrock.com/4/role/ShareholderFeesData", "http://www.blackrock.com/5/role/ShareholderFeesData", "http://www.blackrock.com/6/role/ShareholderFeesData", "http://www.blackrock.com/7/role/ShareholderFeesData", "http://www.blackrock.com/8/role/ShareholderFeesData", "http://www.blackrock.com/9/role/ShareholderFeesData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "Redemption Fee", "negatedLabel": "Redemption Fee" } } }, "auth_ref": [ "r13" ] }, "oef_RedemptionFeeOverRedemption": { "xbrltype": "nonPositivePure4ItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "RedemptionFeeOverRedemption", "presentation": [ "http://www.blackrock.com/1/role/ShareholderFeesData", "http://www.blackrock.com/10/role/ShareholderFeesData", "http://www.blackrock.com/11/role/ShareholderFeesData", "http://www.blackrock.com/12/role/ShareholderFeesData", "http://www.blackrock.com/13/role/ShareholderFeesData", "http://www.blackrock.com/14/role/ShareholderFeesData", "http://www.blackrock.com/15/role/ShareholderFeesData", "http://www.blackrock.com/16/role/ShareholderFeesData", "http://www.blackrock.com/17/role/ShareholderFeesData", "http://www.blackrock.com/18/role/ShareholderFeesData", "http://www.blackrock.com/19/role/ShareholderFeesData", "http://www.blackrock.com/2/role/ShareholderFeesData", "http://www.blackrock.com/20/role/ShareholderFeesData", "http://www.blackrock.com/3/role/ShareholderFeesData", "http://www.blackrock.com/4/role/ShareholderFeesData", "http://www.blackrock.com/5/role/ShareholderFeesData", "http://www.blackrock.com/6/role/ShareholderFeesData", "http://www.blackrock.com/7/role/ShareholderFeesData", "http://www.blackrock.com/8/role/ShareholderFeesData", "http://www.blackrock.com/9/role/ShareholderFeesData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "Redemption Fee (as a percentage of Amount Redeemed)", "negatedLabel": "Redemption Fee (as a percentage of Amount Redeemed)" } } }, "auth_ref": [ "r13" ] }, "bf3_RepresentativeSamplingRiskMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "RepresentativeSamplingRiskMember", "presentation": [ "http://www.blackrock.com/1/role/InvestmentRisks", "http://www.blackrock.com/10/role/InvestmentRisks", "http://www.blackrock.com/11/role/InvestmentRisks", "http://www.blackrock.com/12/role/InvestmentRisks", "http://www.blackrock.com/13/role/InvestmentRisks", "http://www.blackrock.com/14/role/InvestmentRisks", "http://www.blackrock.com/15/role/InvestmentRisks", "http://www.blackrock.com/16/role/InvestmentRisks", "http://www.blackrock.com/17/role/InvestmentRisks", "http://www.blackrock.com/18/role/InvestmentRisks", "http://www.blackrock.com/19/role/InvestmentRisks", "http://www.blackrock.com/2/role/InvestmentRisks", "http://www.blackrock.com/20/role/InvestmentRisks", "http://www.blackrock.com/3/role/InvestmentRisks", "http://www.blackrock.com/4/role/InvestmentRisks", "http://www.blackrock.com/5/role/InvestmentRisks", "http://www.blackrock.com/6/role/InvestmentRisks", "http://www.blackrock.com/7/role/InvestmentRisks", "http://www.blackrock.com/8/role/InvestmentRisks", "http://www.blackrock.com/9/role/InvestmentRisks" ], "lang": { "en-us": { "role": { "label": "Representative Sampling Risk [Member]" } } }, "auth_ref": [] }, "bf3_RetirementIncomeRiskMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "RetirementIncomeRiskMember", "presentation": [ "http://www.blackrock.com/1/role/InvestmentRisks", "http://www.blackrock.com/10/role/InvestmentRisks", "http://www.blackrock.com/11/role/InvestmentRisks", "http://www.blackrock.com/12/role/InvestmentRisks", "http://www.blackrock.com/13/role/InvestmentRisks", "http://www.blackrock.com/14/role/InvestmentRisks", "http://www.blackrock.com/15/role/InvestmentRisks", "http://www.blackrock.com/16/role/InvestmentRisks", "http://www.blackrock.com/17/role/InvestmentRisks", "http://www.blackrock.com/18/role/InvestmentRisks", "http://www.blackrock.com/19/role/InvestmentRisks", "http://www.blackrock.com/2/role/InvestmentRisks", "http://www.blackrock.com/20/role/InvestmentRisks", "http://www.blackrock.com/3/role/InvestmentRisks", "http://www.blackrock.com/4/role/InvestmentRisks", "http://www.blackrock.com/5/role/InvestmentRisks", "http://www.blackrock.com/6/role/InvestmentRisks", "http://www.blackrock.com/7/role/InvestmentRisks", "http://www.blackrock.com/8/role/InvestmentRisks", "http://www.blackrock.com/9/role/InvestmentRisks" ], "lang": { "en-us": { "role": { "label": "Retirement Income Risk [Member]" } } }, "auth_ref": [] }, "oef_RiskAxis": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "RiskAxis", "presentation": [ "http://www.blackrock.com/1/role/InvestmentRisks", "http://www.blackrock.com/10/role/InvestmentRisks", "http://www.blackrock.com/11/role/InvestmentRisks", "http://www.blackrock.com/12/role/InvestmentRisks", "http://www.blackrock.com/13/role/InvestmentRisks", "http://www.blackrock.com/14/role/InvestmentRisks", "http://www.blackrock.com/15/role/InvestmentRisks", "http://www.blackrock.com/16/role/InvestmentRisks", "http://www.blackrock.com/17/role/InvestmentRisks", "http://www.blackrock.com/18/role/InvestmentRisks", "http://www.blackrock.com/19/role/InvestmentRisks", "http://www.blackrock.com/2/role/InvestmentRisks", "http://www.blackrock.com/20/role/InvestmentRisks", "http://www.blackrock.com/3/role/InvestmentRisks", "http://www.blackrock.com/4/role/InvestmentRisks", "http://www.blackrock.com/5/role/InvestmentRisks", "http://www.blackrock.com/6/role/InvestmentRisks", "http://www.blackrock.com/7/role/InvestmentRisks", "http://www.blackrock.com/8/role/InvestmentRisks", "http://www.blackrock.com/9/role/InvestmentRisks", "http://xbrl.sec.gov/rr/role/InvestmentRisks" ], "lang": { "en-us": { "role": { "label": "Risk [Axis]" } } }, "auth_ref": [ "r37" ] }, "oef_RiskLoseMoneyMember": { "xbrltype": "domainItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "RiskLoseMoneyMember", "presentation": [ "http://www.blackrock.com/1/role/InvestmentRisks", "http://www.blackrock.com/10/role/InvestmentRisks", "http://www.blackrock.com/11/role/InvestmentRisks", "http://www.blackrock.com/12/role/InvestmentRisks", "http://www.blackrock.com/13/role/InvestmentRisks", "http://www.blackrock.com/14/role/InvestmentRisks", "http://www.blackrock.com/15/role/InvestmentRisks", "http://www.blackrock.com/16/role/InvestmentRisks", "http://www.blackrock.com/17/role/InvestmentRisks", "http://www.blackrock.com/18/role/InvestmentRisks", "http://www.blackrock.com/19/role/InvestmentRisks", "http://www.blackrock.com/2/role/InvestmentRisks", "http://www.blackrock.com/20/role/InvestmentRisks", "http://www.blackrock.com/3/role/InvestmentRisks", "http://www.blackrock.com/4/role/InvestmentRisks", "http://www.blackrock.com/5/role/InvestmentRisks", "http://www.blackrock.com/6/role/InvestmentRisks", "http://www.blackrock.com/7/role/InvestmentRisks", "http://www.blackrock.com/8/role/InvestmentRisks", "http://www.blackrock.com/9/role/InvestmentRisks", "http://xbrl.sec.gov/rr/role/InvestmentRisks" ], "lang": { "en-us": { "role": { "label": "Risk Lose Money [Member]" } } }, "auth_ref": [ "r36" ] }, "oef_RiskMoneyMarketFundMayImposeFeesOrSuspendSalesMember": { "xbrltype": "domainItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "RiskMoneyMarketFundMayImposeFeesOrSuspendSalesMember", "presentation": [ "http://www.blackrock.com/1/role/InvestmentRisks", "http://www.blackrock.com/10/role/InvestmentRisks", "http://www.blackrock.com/11/role/InvestmentRisks", "http://www.blackrock.com/12/role/InvestmentRisks", "http://www.blackrock.com/13/role/InvestmentRisks", "http://www.blackrock.com/14/role/InvestmentRisks", "http://www.blackrock.com/15/role/InvestmentRisks", "http://www.blackrock.com/16/role/InvestmentRisks", "http://www.blackrock.com/17/role/InvestmentRisks", "http://www.blackrock.com/18/role/InvestmentRisks", "http://www.blackrock.com/19/role/InvestmentRisks", "http://www.blackrock.com/2/role/InvestmentRisks", "http://www.blackrock.com/20/role/InvestmentRisks", "http://www.blackrock.com/3/role/InvestmentRisks", "http://www.blackrock.com/4/role/InvestmentRisks", "http://www.blackrock.com/5/role/InvestmentRisks", "http://www.blackrock.com/6/role/InvestmentRisks", "http://www.blackrock.com/7/role/InvestmentRisks", "http://www.blackrock.com/8/role/InvestmentRisks", "http://www.blackrock.com/9/role/InvestmentRisks", "http://xbrl.sec.gov/rr/role/InvestmentRisks" ], "lang": { "en-us": { "role": { "label": "Risk Money Market Fund May Impose Fees or Suspend Sales [Member]" } } }, "auth_ref": [ "r38" ] }, "oef_RiskMoneyMarketFundMayNotPreserveDollarMember": { "xbrltype": "domainItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "RiskMoneyMarketFundMayNotPreserveDollarMember", "presentation": [ "http://www.blackrock.com/1/role/InvestmentRisks", "http://www.blackrock.com/10/role/InvestmentRisks", "http://www.blackrock.com/11/role/InvestmentRisks", "http://www.blackrock.com/12/role/InvestmentRisks", "http://www.blackrock.com/13/role/InvestmentRisks", "http://www.blackrock.com/14/role/InvestmentRisks", "http://www.blackrock.com/15/role/InvestmentRisks", "http://www.blackrock.com/16/role/InvestmentRisks", "http://www.blackrock.com/17/role/InvestmentRisks", "http://www.blackrock.com/18/role/InvestmentRisks", "http://www.blackrock.com/19/role/InvestmentRisks", "http://www.blackrock.com/2/role/InvestmentRisks", "http://www.blackrock.com/20/role/InvestmentRisks", "http://www.blackrock.com/3/role/InvestmentRisks", "http://www.blackrock.com/4/role/InvestmentRisks", "http://www.blackrock.com/5/role/InvestmentRisks", "http://www.blackrock.com/6/role/InvestmentRisks", "http://www.blackrock.com/7/role/InvestmentRisks", "http://www.blackrock.com/8/role/InvestmentRisks", "http://www.blackrock.com/9/role/InvestmentRisks", "http://xbrl.sec.gov/rr/role/InvestmentRisks" ], "lang": { "en-us": { "role": { "label": "Risk Money Market Fund May Not Preserve Dollar [Member]" } } }, "auth_ref": [ "r38" ] }, "oef_RiskMoneyMarketFundPriceFluctuatesMember": { "xbrltype": "domainItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "RiskMoneyMarketFundPriceFluctuatesMember", "presentation": [ "http://www.blackrock.com/1/role/InvestmentRisks", "http://www.blackrock.com/10/role/InvestmentRisks", "http://www.blackrock.com/11/role/InvestmentRisks", "http://www.blackrock.com/12/role/InvestmentRisks", "http://www.blackrock.com/13/role/InvestmentRisks", "http://www.blackrock.com/14/role/InvestmentRisks", "http://www.blackrock.com/15/role/InvestmentRisks", "http://www.blackrock.com/16/role/InvestmentRisks", "http://www.blackrock.com/17/role/InvestmentRisks", "http://www.blackrock.com/18/role/InvestmentRisks", "http://www.blackrock.com/19/role/InvestmentRisks", "http://www.blackrock.com/2/role/InvestmentRisks", "http://www.blackrock.com/20/role/InvestmentRisks", "http://www.blackrock.com/3/role/InvestmentRisks", "http://www.blackrock.com/4/role/InvestmentRisks", "http://www.blackrock.com/5/role/InvestmentRisks", "http://www.blackrock.com/6/role/InvestmentRisks", "http://www.blackrock.com/7/role/InvestmentRisks", "http://www.blackrock.com/8/role/InvestmentRisks", "http://www.blackrock.com/9/role/InvestmentRisks", "http://xbrl.sec.gov/rr/role/InvestmentRisks" ], "lang": { "en-us": { "role": { "label": "Risk Money Market Fund Price Fluctuates [Member]" } } }, "auth_ref": [ "r39" ] }, "oef_RiskMoneyMarketFundSponsorMayNotProvideSupportMember": { "xbrltype": "domainItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "RiskMoneyMarketFundSponsorMayNotProvideSupportMember", "presentation": [ "http://www.blackrock.com/1/role/InvestmentRisks", "http://www.blackrock.com/10/role/InvestmentRisks", "http://www.blackrock.com/11/role/InvestmentRisks", "http://www.blackrock.com/12/role/InvestmentRisks", "http://www.blackrock.com/13/role/InvestmentRisks", "http://www.blackrock.com/14/role/InvestmentRisks", "http://www.blackrock.com/15/role/InvestmentRisks", "http://www.blackrock.com/16/role/InvestmentRisks", "http://www.blackrock.com/17/role/InvestmentRisks", "http://www.blackrock.com/18/role/InvestmentRisks", "http://www.blackrock.com/19/role/InvestmentRisks", "http://www.blackrock.com/2/role/InvestmentRisks", "http://www.blackrock.com/20/role/InvestmentRisks", "http://www.blackrock.com/3/role/InvestmentRisks", "http://www.blackrock.com/4/role/InvestmentRisks", "http://www.blackrock.com/5/role/InvestmentRisks", "http://www.blackrock.com/6/role/InvestmentRisks", "http://www.blackrock.com/7/role/InvestmentRisks", "http://www.blackrock.com/8/role/InvestmentRisks", "http://www.blackrock.com/9/role/InvestmentRisks", "http://xbrl.sec.gov/rr/role/InvestmentRisks" ], "lang": { "en-us": { "role": { "label": "Risk Money Market Fund Sponsor May Not Provide Support [Member]" } } }, "auth_ref": [ "r38" ] }, "oef_RiskNondiversifiedStatusMember": { "xbrltype": "domainItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "RiskNondiversifiedStatusMember", "presentation": [ "http://www.blackrock.com/1/role/InvestmentRisks", "http://www.blackrock.com/10/role/InvestmentRisks", "http://www.blackrock.com/11/role/InvestmentRisks", "http://www.blackrock.com/12/role/InvestmentRisks", "http://www.blackrock.com/13/role/InvestmentRisks", "http://www.blackrock.com/14/role/InvestmentRisks", "http://www.blackrock.com/15/role/InvestmentRisks", "http://www.blackrock.com/16/role/InvestmentRisks", "http://www.blackrock.com/17/role/InvestmentRisks", "http://www.blackrock.com/18/role/InvestmentRisks", "http://www.blackrock.com/19/role/InvestmentRisks", "http://www.blackrock.com/2/role/InvestmentRisks", "http://www.blackrock.com/20/role/InvestmentRisks", "http://www.blackrock.com/3/role/InvestmentRisks", "http://www.blackrock.com/4/role/InvestmentRisks", "http://www.blackrock.com/5/role/InvestmentRisks", "http://www.blackrock.com/6/role/InvestmentRisks", "http://www.blackrock.com/7/role/InvestmentRisks", "http://www.blackrock.com/8/role/InvestmentRisks", "http://www.blackrock.com/9/role/InvestmentRisks", "http://xbrl.sec.gov/rr/role/InvestmentRisks" ], "lang": { "en-us": { "role": { "label": "Risk Nondiversified Status [Member]" } } }, "auth_ref": [ "r41" ] }, "oef_RiskNotInsuredDepositoryInstitutionMember": { "xbrltype": "domainItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "RiskNotInsuredDepositoryInstitutionMember", "presentation": [ "http://www.blackrock.com/1/role/InvestmentRisks", "http://www.blackrock.com/10/role/InvestmentRisks", "http://www.blackrock.com/11/role/InvestmentRisks", "http://www.blackrock.com/12/role/InvestmentRisks", "http://www.blackrock.com/13/role/InvestmentRisks", "http://www.blackrock.com/14/role/InvestmentRisks", "http://www.blackrock.com/15/role/InvestmentRisks", "http://www.blackrock.com/16/role/InvestmentRisks", "http://www.blackrock.com/17/role/InvestmentRisks", "http://www.blackrock.com/18/role/InvestmentRisks", "http://www.blackrock.com/19/role/InvestmentRisks", "http://www.blackrock.com/2/role/InvestmentRisks", "http://www.blackrock.com/20/role/InvestmentRisks", "http://www.blackrock.com/3/role/InvestmentRisks", "http://www.blackrock.com/4/role/InvestmentRisks", "http://www.blackrock.com/5/role/InvestmentRisks", "http://www.blackrock.com/6/role/InvestmentRisks", "http://www.blackrock.com/7/role/InvestmentRisks", "http://www.blackrock.com/8/role/InvestmentRisks", "http://www.blackrock.com/9/role/InvestmentRisks", "http://xbrl.sec.gov/rr/role/InvestmentRisks" ], "lang": { "en-us": { "role": { "label": "Risk Not Insured Depository Institution [Member]" } } }, "auth_ref": [ "r40" ] }, "oef_RiskNotInsuredMember": { "xbrltype": "domainItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "RiskNotInsuredMember", "presentation": [ "http://www.blackrock.com/1/role/InvestmentRisks", "http://www.blackrock.com/10/role/InvestmentRisks", "http://www.blackrock.com/11/role/InvestmentRisks", "http://www.blackrock.com/12/role/InvestmentRisks", "http://www.blackrock.com/13/role/InvestmentRisks", "http://www.blackrock.com/14/role/InvestmentRisks", "http://www.blackrock.com/15/role/InvestmentRisks", "http://www.blackrock.com/16/role/InvestmentRisks", "http://www.blackrock.com/17/role/InvestmentRisks", "http://www.blackrock.com/18/role/InvestmentRisks", "http://www.blackrock.com/19/role/InvestmentRisks", "http://www.blackrock.com/2/role/InvestmentRisks", "http://www.blackrock.com/20/role/InvestmentRisks", "http://www.blackrock.com/3/role/InvestmentRisks", "http://www.blackrock.com/4/role/InvestmentRisks", "http://www.blackrock.com/5/role/InvestmentRisks", "http://www.blackrock.com/6/role/InvestmentRisks", "http://www.blackrock.com/7/role/InvestmentRisks", "http://www.blackrock.com/8/role/InvestmentRisks", "http://www.blackrock.com/9/role/InvestmentRisks", "http://xbrl.sec.gov/rr/role/InvestmentRisks" ], "lang": { "en-us": { "role": { "label": "Risk Not Insured [Member]" } } }, "auth_ref": [ "r38" ] }, "bf3_RiskOfESGInvestingMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "RiskOfESGInvestingMember", "presentation": [ "http://www.blackrock.com/1/role/InvestmentRisks", "http://www.blackrock.com/10/role/InvestmentRisks", "http://www.blackrock.com/11/role/InvestmentRisks", "http://www.blackrock.com/12/role/InvestmentRisks", "http://www.blackrock.com/13/role/InvestmentRisks", "http://www.blackrock.com/14/role/InvestmentRisks", "http://www.blackrock.com/15/role/InvestmentRisks", "http://www.blackrock.com/16/role/InvestmentRisks", "http://www.blackrock.com/17/role/InvestmentRisks", "http://www.blackrock.com/18/role/InvestmentRisks", "http://www.blackrock.com/19/role/InvestmentRisks", "http://www.blackrock.com/2/role/InvestmentRisks", "http://www.blackrock.com/20/role/InvestmentRisks", "http://www.blackrock.com/3/role/InvestmentRisks", "http://www.blackrock.com/4/role/InvestmentRisks", "http://www.blackrock.com/5/role/InvestmentRisks", "http://www.blackrock.com/6/role/InvestmentRisks", "http://www.blackrock.com/7/role/InvestmentRisks", "http://www.blackrock.com/8/role/InvestmentRisks", "http://www.blackrock.com/9/role/InvestmentRisks" ], "lang": { "en-us": { "role": { "label": "Risk of ESG Investing [Member]" } } }, "auth_ref": [] }, "bf3_RiskOfInvestingInTheUnitedStatesMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "RiskOfInvestingInTheUnitedStatesMember", "presentation": [ "http://www.blackrock.com/1/role/InvestmentRisks", "http://www.blackrock.com/10/role/InvestmentRisks", "http://www.blackrock.com/11/role/InvestmentRisks", "http://www.blackrock.com/12/role/InvestmentRisks", "http://www.blackrock.com/13/role/InvestmentRisks", "http://www.blackrock.com/14/role/InvestmentRisks", "http://www.blackrock.com/15/role/InvestmentRisks", "http://www.blackrock.com/16/role/InvestmentRisks", "http://www.blackrock.com/17/role/InvestmentRisks", "http://www.blackrock.com/18/role/InvestmentRisks", "http://www.blackrock.com/19/role/InvestmentRisks", "http://www.blackrock.com/2/role/InvestmentRisks", "http://www.blackrock.com/20/role/InvestmentRisks", "http://www.blackrock.com/3/role/InvestmentRisks", "http://www.blackrock.com/4/role/InvestmentRisks", "http://www.blackrock.com/5/role/InvestmentRisks", "http://www.blackrock.com/6/role/InvestmentRisks", "http://www.blackrock.com/7/role/InvestmentRisks", "http://www.blackrock.com/8/role/InvestmentRisks", "http://www.blackrock.com/9/role/InvestmentRisks" ], "lang": { "en-us": { "role": { "label": "Risk of Investing in the United States [Member]" } } }, "auth_ref": [] }, "oef_RiskReturnHeading": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "RiskReturnHeading", "presentation": [ "http://www.blackrock.com/1/role/RiskReturn", "http://www.blackrock.com/10/role/RiskReturn", "http://www.blackrock.com/11/role/RiskReturn", "http://www.blackrock.com/12/role/RiskReturn", "http://www.blackrock.com/13/role/RiskReturn", "http://www.blackrock.com/14/role/RiskReturn", "http://www.blackrock.com/15/role/RiskReturn", "http://www.blackrock.com/16/role/RiskReturn", "http://www.blackrock.com/17/role/RiskReturn", "http://www.blackrock.com/18/role/RiskReturn", "http://www.blackrock.com/19/role/RiskReturn", "http://www.blackrock.com/2/role/RiskReturn", "http://www.blackrock.com/20/role/RiskReturn", "http://www.blackrock.com/3/role/RiskReturn", "http://www.blackrock.com/4/role/RiskReturn", "http://www.blackrock.com/5/role/RiskReturn", "http://www.blackrock.com/6/role/RiskReturn", "http://www.blackrock.com/7/role/RiskReturn", "http://www.blackrock.com/8/role/RiskReturn", "http://www.blackrock.com/9/role/RiskReturn", "http://xbrl.sec.gov/rr/role/RiskReturn" ], "lang": { "en-us": { "role": { "label": "Risk/Return [Heading]" } } }, "auth_ref": [ "r60" ] }, "oef_RiskTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "RiskTextBlock", "presentation": [ "http://www.blackrock.com/1/role/InvestmentRisks", "http://www.blackrock.com/10/role/InvestmentRisks", "http://www.blackrock.com/11/role/InvestmentRisks", "http://www.blackrock.com/12/role/InvestmentRisks", "http://www.blackrock.com/13/role/InvestmentRisks", "http://www.blackrock.com/14/role/InvestmentRisks", "http://www.blackrock.com/15/role/InvestmentRisks", "http://www.blackrock.com/16/role/InvestmentRisks", "http://www.blackrock.com/17/role/InvestmentRisks", "http://www.blackrock.com/18/role/InvestmentRisks", "http://www.blackrock.com/19/role/InvestmentRisks", "http://www.blackrock.com/2/role/InvestmentRisks", "http://www.blackrock.com/20/role/InvestmentRisks", "http://www.blackrock.com/3/role/InvestmentRisks", "http://www.blackrock.com/4/role/InvestmentRisks", "http://www.blackrock.com/5/role/InvestmentRisks", "http://www.blackrock.com/6/role/InvestmentRisks", "http://www.blackrock.com/7/role/InvestmentRisks", "http://www.blackrock.com/8/role/InvestmentRisks", "http://www.blackrock.com/9/role/InvestmentRisks", "http://xbrl.sec.gov/rr/role/InvestmentRisks" ], "lang": { "en-us": { "role": { "label": "Risk [Text Block]" } } }, "auth_ref": [ "r37" ] }, "oef_RisksAbstract": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "RisksAbstract", "lang": { "en-us": { "role": { "label": "Risks [Abstract]" } } }, "auth_ref": [ "r36" ] }, "bf3_S000069122BloombergMSCIUSAggregateESGFocusIndexMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "S000069122BloombergMSCIUSAggregateESGFocusIndexMember", "presentation": [ "http://www.blackrock.com/1/role/PerformanceTableData", "http://www.blackrock.com/11/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "verboseLabel": "Bloomberg MSCI U.S. Aggregate ESG Focus Index (Reflects no deduction for fees, expenses or taxes)", "label": "S000069122 Bloomberg MSCI U S Aggregate ESG Focus Index [Member]" } } }, "auth_ref": [] }, "bf3_S000069122BloombergUSAggregateBondIndexMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "S000069122BloombergUSAggregateBondIndexMember", "presentation": [ "http://www.blackrock.com/1/role/PerformanceTableData", "http://www.blackrock.com/11/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "verboseLabel": "Bloomberg U.S. Aggregate Bond Index (Reflects no deduction for fees, expenses or taxes)", "label": "S000069122 Bloomberg U S Aggregate Bond Index [Member]" } } }, "auth_ref": [] }, "bf3_S000069122LifePathESGIndexRetirementFundCustomBenchmarkMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "S000069122LifePathESGIndexRetirementFundCustomBenchmarkMember", "presentation": [ "http://www.blackrock.com/1/role/PerformanceTableData", "http://www.blackrock.com/11/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "verboseLabel": "LifePath ESG Index Retirement Fund Custom Benchmark (Reflects no deduction for fees, expenses or taxes except as noted)", "label": "S000069122 LifePath ESG Index Retirement Fund Custom Benchmark [Member]" } } }, "auth_ref": [] }, "bf3_S000069122MSCIUSAIndexMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "S000069122MSCIUSAIndexMember", "presentation": [ "http://www.blackrock.com/1/role/PerformanceTableData", "http://www.blackrock.com/11/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "verboseLabel": "MSCI USA Index (Reflects no deduction for fees, expenses or taxes)", "label": "S000069122 MSCI USA Index [Member]" } } }, "auth_ref": [] }, "bf3_S000069122Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "S000069122Member", "presentation": [ "http://www.blackrock.com/1/role/BarChartData", "http://www.blackrock.com/1/role/ExpenseExample", "http://www.blackrock.com/1/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/1/role/FeesAndExpenses", "http://www.blackrock.com/1/role/InvestmentRisks", "http://www.blackrock.com/1/role/InvestmentStrategy", "http://www.blackrock.com/1/role/N1aSupplement", "http://www.blackrock.com/1/role/OperatingExpensesData", "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/1/role/RiskReturn", "http://www.blackrock.com/1/role/ShareholderFeesData", "http://www.blackrock.com/11/role/BarChartData", "http://www.blackrock.com/11/role/ExpenseExample", "http://www.blackrock.com/11/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/11/role/FeesAndExpenses", "http://www.blackrock.com/11/role/InvestmentRisks", "http://www.blackrock.com/11/role/InvestmentStrategy", "http://www.blackrock.com/11/role/N1aSupplement", "http://www.blackrock.com/11/role/OperatingExpensesData", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/11/role/RiskReturn", "http://www.blackrock.com/11/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "verboseLabel": "BlackRock LifePath ESG Index Retirement Fund", "label": "S000069122 [Member]" } } }, "auth_ref": [] }, "bf3_S000069123BloombergUSAggregateBondIndex1Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "S000069123BloombergUSAggregateBondIndex1Member", "presentation": [ "http://www.blackrock.com/19/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "verboseLabel": "Bloomberg U.S. Aggregate Bond Index (Reflects no deduction for fees, expenses or taxes)", "label": "S000069123 Bloomberg U S Aggregate Bond Index1 [Member]" } } }, "auth_ref": [] }, "bf3_S000069123BloombergUSAggregateBondIndexMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "S000069123BloombergUSAggregateBondIndexMember", "presentation": [ "http://www.blackrock.com/9/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "verboseLabel": "Bloomberg U.S. Aggregate Bond Index (Reflects no deduction for fees, expenses or taxes)", "label": "S000069123 Bloomberg U S Aggregate Bond Index [Member]" } } }, "auth_ref": [] }, "bf3_S000069123LifePathESGIndex2065FundCustomBenchmark1Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "S000069123LifePathESGIndex2065FundCustomBenchmark1Member", "presentation": [ "http://www.blackrock.com/19/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "verboseLabel": "LifePath ESG Index 2065 Fund Custom Benchmark (Reflects no deduction for fees, expenses or taxes except as noted)", "label": "S000069123 Life Path E S G Index 2065 Fund Custom Benchmark1 [Member]" } } }, "auth_ref": [] }, "bf3_S000069123LifePathESGIndex2065FundCustomBenchmarkMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "S000069123LifePathESGIndex2065FundCustomBenchmarkMember", "presentation": [ "http://www.blackrock.com/9/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "verboseLabel": "LifePath ESG Index 2065 Fund Custom Benchmark (Reflects no deduction for fees, expenses or taxes except as noted)", "label": "S000069123 Life Path E S G Index 2065 Fund Custom Benchmark [Member]" } } }, "auth_ref": [] }, "bf3_S000069123MSCIUSAExtendedESGFocusIndex1Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "S000069123MSCIUSAExtendedESGFocusIndex1Member", "presentation": [ "http://www.blackrock.com/19/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "verboseLabel": "MSCI USA Extended ESG Focus Index (Reflects no deduction for fees, expenses or taxes)", "label": "S000069123 M S C I U S A Extended E S G Focus Index1 [Member]" } } }, "auth_ref": [] }, "bf3_S000069123MSCIUSAExtendedESGFocusIndexMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "S000069123MSCIUSAExtendedESGFocusIndexMember", "presentation": [ "http://www.blackrock.com/9/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "verboseLabel": "MSCI USA Extended ESG Focus Index (Reflects no deduction for fees, expenses or taxes)", "label": "S000069123 M S C I U S A Extended E S G Focus Index [Member]" } } }, "auth_ref": [] }, "bf3_S000069123MSCIUSAIndex1Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "S000069123MSCIUSAIndex1Member", "presentation": [ "http://www.blackrock.com/19/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "verboseLabel": "MSCI USA Index (Reflects no deduction for fees, expenses or taxes)", "label": "S000069123 M S C I U S A Index1 [Member]" } } }, "auth_ref": [] }, "bf3_S000069123MSCIUSAIndexMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "S000069123MSCIUSAIndexMember", "presentation": [ "http://www.blackrock.com/9/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "verboseLabel": "MSCI USA Index (Reflects no deduction for fees, expenses or taxes)", "label": "S000069123 M S C I U S A Index [Member]" } } }, "auth_ref": [] }, "bf3_S000069123Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "S000069123Member", "presentation": [ "http://www.blackrock.com/19/role/BarChartData", "http://www.blackrock.com/19/role/ExpenseExample", "http://www.blackrock.com/19/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/19/role/FeesAndExpenses", "http://www.blackrock.com/19/role/InvestmentRisks", "http://www.blackrock.com/19/role/InvestmentStrategy", "http://www.blackrock.com/19/role/N1aSupplement", "http://www.blackrock.com/19/role/OperatingExpensesData", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/19/role/RiskReturn", "http://www.blackrock.com/19/role/ShareholderFeesData", "http://www.blackrock.com/9/role/BarChartData", "http://www.blackrock.com/9/role/ExpenseExample", "http://www.blackrock.com/9/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/9/role/FeesAndExpenses", "http://www.blackrock.com/9/role/InvestmentRisks", "http://www.blackrock.com/9/role/InvestmentStrategy", "http://www.blackrock.com/9/role/N1aSupplement", "http://www.blackrock.com/9/role/OperatingExpensesData", "http://www.blackrock.com/9/role/PerformanceManagement", "http://www.blackrock.com/9/role/RiskReturn", "http://www.blackrock.com/9/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "verboseLabel": "BlackRock LifePath ESG Index 2065 Fund", "label": "S000069123 [Member]" } } }, "auth_ref": [] }, "bf3_S000069125BloombergUSAggregateBondIndexMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "S000069125BloombergUSAggregateBondIndexMember", "presentation": [ "http://www.blackrock.com/12/role/PerformanceTableData", "http://www.blackrock.com/2/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "verboseLabel": "Bloomberg U.S. Aggregate Bond Index (Reflects no deduction for fees, expenses or taxes)", "label": "S000069125 Bloomberg U S Aggregate Bond Index [Member]" } } }, "auth_ref": [] }, "bf3_S000069125LifePathESGIndex2030FundCustomBenchmarkMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "S000069125LifePathESGIndex2030FundCustomBenchmarkMember", "presentation": [ "http://www.blackrock.com/12/role/PerformanceTableData", "http://www.blackrock.com/2/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "verboseLabel": "LifePath ESG Index 2030 Fund Custom Benchmark (Reflects no deduction for fees, expenses or taxes except as noted)", "label": "S000069125 LifePath ESG Index 2030 Fund Custom Benchmark [Member]" } } }, "auth_ref": [] }, "bf3_S000069125MSCIUSAExtendedESGFocusIndexMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "S000069125MSCIUSAExtendedESGFocusIndexMember", "presentation": [ "http://www.blackrock.com/12/role/PerformanceTableData", "http://www.blackrock.com/2/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "verboseLabel": "MSCI USA Extended ESG Focus Index (Reflects no deduction for fees, expenses or taxes)", "label": "S000069125 MSCI USA Extended ESG Focus Index [Member]" } } }, "auth_ref": [] }, "bf3_S000069125MSCIUSAIndexMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "S000069125MSCIUSAIndexMember", "presentation": [ "http://www.blackrock.com/12/role/PerformanceTableData", "http://www.blackrock.com/2/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "verboseLabel": "MSCI USA Index (Reflects no deduction for fees, expenses or taxes)", "label": "S000069125 MSCI USA Index [Member]" } } }, "auth_ref": [] }, "bf3_S000069125Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "S000069125Member", "presentation": [ "http://www.blackrock.com/12/role/BarChartData", "http://www.blackrock.com/12/role/ExpenseExample", "http://www.blackrock.com/12/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/12/role/FeesAndExpenses", "http://www.blackrock.com/12/role/InvestmentRisks", "http://www.blackrock.com/12/role/InvestmentStrategy", "http://www.blackrock.com/12/role/N1aSupplement", "http://www.blackrock.com/12/role/OperatingExpensesData", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/12/role/RiskReturn", "http://www.blackrock.com/12/role/ShareholderFeesData", "http://www.blackrock.com/2/role/BarChartData", "http://www.blackrock.com/2/role/ExpenseExample", "http://www.blackrock.com/2/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/2/role/FeesAndExpenses", "http://www.blackrock.com/2/role/InvestmentRisks", "http://www.blackrock.com/2/role/InvestmentStrategy", "http://www.blackrock.com/2/role/N1aSupplement", "http://www.blackrock.com/2/role/OperatingExpensesData", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/2/role/RiskReturn", "http://www.blackrock.com/2/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "verboseLabel": "BlackRock LifePath ESG Index 2030 Fund", "label": "S000069125 [Member]" } } }, "auth_ref": [] }, "bf3_S000069126BloombergUSAggregateBondIndexMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "S000069126BloombergUSAggregateBondIndexMember", "presentation": [ "http://www.blackrock.com/13/role/PerformanceTableData", "http://www.blackrock.com/3/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "verboseLabel": "Bloomberg U.S. Aggregate Bond Index (Reflects no deduction for fees, expenses or taxes)", "label": "S000069126 Bloomberg US Aggregate Bond Index [Member]" } } }, "auth_ref": [] }, "bf3_S000069126LifePathESGIndex2035FundCustomBenchmarkMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "S000069126LifePathESGIndex2035FundCustomBenchmarkMember", "presentation": [ "http://www.blackrock.com/13/role/PerformanceTableData", "http://www.blackrock.com/3/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "verboseLabel": "LifePath ESG Index 2035 Fund Custom Benchmark (Reflects no deduction for fees, expenses or taxes except as noted)", "label": "S000069126 LifePath ESG Index 2035 Fund Custom Benchmark [Member]" } } }, "auth_ref": [] }, "bf3_S000069126MSCIUSAExtendedESGFocusIndexMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "S000069126MSCIUSAExtendedESGFocusIndexMember", "presentation": [ "http://www.blackrock.com/13/role/PerformanceTableData", "http://www.blackrock.com/3/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "verboseLabel": "MSCI USA Extended ESG Focus Index (Reflects no deduction for fees, expenses or taxes)", "label": "S000069126 MSCI USA Extended ESG Focus Index [Member]" } } }, "auth_ref": [] }, "bf3_S000069126MSCIUSAIndexMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "S000069126MSCIUSAIndexMember", "presentation": [ "http://www.blackrock.com/13/role/PerformanceTableData", "http://www.blackrock.com/3/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "verboseLabel": "MSCI USA Index (Reflects no deduction for fees, expenses or taxes)", "label": "S000069126 MSCI USA Index [Member]" } } }, "auth_ref": [] }, "bf3_S000069126Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "S000069126Member", "presentation": [ "http://www.blackrock.com/13/role/BarChartData", "http://www.blackrock.com/13/role/ExpenseExample", "http://www.blackrock.com/13/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/13/role/FeesAndExpenses", "http://www.blackrock.com/13/role/InvestmentRisks", "http://www.blackrock.com/13/role/InvestmentStrategy", "http://www.blackrock.com/13/role/N1aSupplement", "http://www.blackrock.com/13/role/OperatingExpensesData", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/13/role/RiskReturn", "http://www.blackrock.com/13/role/ShareholderFeesData", "http://www.blackrock.com/3/role/BarChartData", "http://www.blackrock.com/3/role/ExpenseExample", "http://www.blackrock.com/3/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/3/role/FeesAndExpenses", "http://www.blackrock.com/3/role/InvestmentRisks", "http://www.blackrock.com/3/role/InvestmentStrategy", "http://www.blackrock.com/3/role/N1aSupplement", "http://www.blackrock.com/3/role/OperatingExpensesData", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/3/role/RiskReturn", "http://www.blackrock.com/3/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "verboseLabel": "BlackRock LifePath ESG Index 2035 Fund", "label": "S000069126 [Member]" } } }, "auth_ref": [] }, "bf3_S000069127BloombergUSAggregateBondIndexMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "S000069127BloombergUSAggregateBondIndexMember", "presentation": [ "http://www.blackrock.com/14/role/PerformanceTableData", "http://www.blackrock.com/4/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "verboseLabel": "Bloomberg U.S. Aggregate Bond Index (Reflects no deduction for fees, expenses or taxes)", "label": "S000069127 Bloomberg US Aggregate Bond Index [Member]" } } }, "auth_ref": [] }, "bf3_S000069127LifePathESGIndex2040FundCustomBenchmarkMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "S000069127LifePathESGIndex2040FundCustomBenchmarkMember", "presentation": [ "http://www.blackrock.com/14/role/PerformanceTableData", "http://www.blackrock.com/4/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "verboseLabel": "LifePath ESG Index 2040 Fund Custom Benchmark (Reflects no deduction for fees, expenses or taxes except as noted)", "label": "S000069127 LifePath ESG Index 2040 Fund Custom Benchmark [Member]" } } }, "auth_ref": [] }, "bf3_S000069127MSCIUSAExtendedESGFocusIndexMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "S000069127MSCIUSAExtendedESGFocusIndexMember", "presentation": [ "http://www.blackrock.com/14/role/PerformanceTableData", "http://www.blackrock.com/4/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "verboseLabel": "MSCI USA Extended ESG Focus Index (Reflects no deduction for fees, expenses or taxes)", "label": "S000069127 MSCI USA Extended ESG Focus Index [Member]" } } }, "auth_ref": [] }, "bf3_S000069127MSCIUSAIndexMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "S000069127MSCIUSAIndexMember", "presentation": [ "http://www.blackrock.com/14/role/PerformanceTableData", "http://www.blackrock.com/4/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "verboseLabel": "MSCI USA Index (Reflects no deduction for fees, expenses or taxes)", "label": "S000069127 MSCI USA Index [Member]" } } }, "auth_ref": [] }, "bf3_S000069127Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "S000069127Member", "presentation": [ "http://www.blackrock.com/14/role/BarChartData", "http://www.blackrock.com/14/role/ExpenseExample", "http://www.blackrock.com/14/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/14/role/FeesAndExpenses", "http://www.blackrock.com/14/role/InvestmentRisks", "http://www.blackrock.com/14/role/InvestmentStrategy", "http://www.blackrock.com/14/role/N1aSupplement", "http://www.blackrock.com/14/role/OperatingExpensesData", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/14/role/RiskReturn", "http://www.blackrock.com/14/role/ShareholderFeesData", "http://www.blackrock.com/4/role/BarChartData", "http://www.blackrock.com/4/role/ExpenseExample", "http://www.blackrock.com/4/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/4/role/FeesAndExpenses", "http://www.blackrock.com/4/role/InvestmentRisks", "http://www.blackrock.com/4/role/InvestmentStrategy", "http://www.blackrock.com/4/role/N1aSupplement", "http://www.blackrock.com/4/role/OperatingExpensesData", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/4/role/RiskReturn", "http://www.blackrock.com/4/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "verboseLabel": "BlackRock LifePath ESG Index 2040 Fund", "label": "S000069127 [Member]" } } }, "auth_ref": [] }, "bf3_S000069128BloombergUSAggregateBondIndexMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "S000069128BloombergUSAggregateBondIndexMember", "presentation": [ "http://www.blackrock.com/15/role/PerformanceTableData", "http://www.blackrock.com/5/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "verboseLabel": "Bloomberg U.S. Aggregate Bond Index (Reflects no deduction for fees, expenses or taxes)", "label": "S000069128 Bloomberg U S Aggregate Bond Index [Member]" } } }, "auth_ref": [] }, "bf3_S000069128LifePathESGIndex2045FundCustomBenchmarkMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "S000069128LifePathESGIndex2045FundCustomBenchmarkMember", "presentation": [ "http://www.blackrock.com/15/role/PerformanceTableData", "http://www.blackrock.com/5/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "verboseLabel": "LifePath ESG Index 2045 Fund Custom Benchmark (Reflects no deduction for fees, expenses or taxes except as noted)", "label": "S000069128 LifePath ESG Index 2045 Fund Custom Benchmark [Member]" } } }, "auth_ref": [] }, "bf3_S000069128MSCIUSAExtendedESGFocusIndexMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "S000069128MSCIUSAExtendedESGFocusIndexMember", "presentation": [ "http://www.blackrock.com/15/role/PerformanceTableData", "http://www.blackrock.com/5/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "verboseLabel": "MSCI USA Extended ESG Focus Index (Reflects no deduction for fees, expenses or taxes)", "label": "S000069128 MSCI USA Extended ESG Focus Index [Member]" } } }, "auth_ref": [] }, "bf3_S000069128MSCIUSAIndexMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "S000069128MSCIUSAIndexMember", "presentation": [ "http://www.blackrock.com/15/role/PerformanceTableData", "http://www.blackrock.com/5/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "verboseLabel": "MSCI USA Index (Reflects no deduction for fees, expenses or taxes)", "label": "S000069128 MSCI USA Index [Member]" } } }, "auth_ref": [] }, "bf3_S000069128Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "S000069128Member", "presentation": [ "http://www.blackrock.com/15/role/BarChartData", "http://www.blackrock.com/15/role/ExpenseExample", "http://www.blackrock.com/15/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/15/role/FeesAndExpenses", "http://www.blackrock.com/15/role/InvestmentRisks", "http://www.blackrock.com/15/role/InvestmentStrategy", "http://www.blackrock.com/15/role/N1aSupplement", "http://www.blackrock.com/15/role/OperatingExpensesData", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/15/role/RiskReturn", "http://www.blackrock.com/15/role/ShareholderFeesData", "http://www.blackrock.com/5/role/BarChartData", "http://www.blackrock.com/5/role/ExpenseExample", "http://www.blackrock.com/5/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/5/role/FeesAndExpenses", "http://www.blackrock.com/5/role/InvestmentRisks", "http://www.blackrock.com/5/role/InvestmentStrategy", "http://www.blackrock.com/5/role/N1aSupplement", "http://www.blackrock.com/5/role/OperatingExpensesData", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/5/role/RiskReturn", "http://www.blackrock.com/5/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "verboseLabel": "BlackRock LifePath ESG Index 2045 Fund", "label": "S000069128 [Member]" } } }, "auth_ref": [] }, "bf3_S000069129BloombergUSAggregateBondIndexMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "S000069129BloombergUSAggregateBondIndexMember", "presentation": [ "http://www.blackrock.com/16/role/PerformanceTableData", "http://www.blackrock.com/6/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "verboseLabel": "Bloomberg U.S. Aggregate Bond Index (Reflects no deduction for fees, expenses or taxes)", "label": "S000069129 Bloomberg U S Aggregate Bond Index [Member]" } } }, "auth_ref": [] }, "bf3_S000069129LifePathESGIndex2050FundCustomBenchmarkMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "S000069129LifePathESGIndex2050FundCustomBenchmarkMember", "presentation": [ "http://www.blackrock.com/16/role/PerformanceTableData", "http://www.blackrock.com/6/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "verboseLabel": "LifePath ESG Index 2050 Fund Custom Benchmark (Reflects no deduction for fees, expenses or taxes except as noted)", "label": "S000069129 LifePath ESG Index 2050 Fund Custom Benchmark [Member]" } } }, "auth_ref": [] }, "bf3_S000069129MSCIUSAExtendedESGFocusIndexMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "S000069129MSCIUSAExtendedESGFocusIndexMember", "presentation": [ "http://www.blackrock.com/16/role/PerformanceTableData", "http://www.blackrock.com/6/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "verboseLabel": "MSCI USA Extended ESG Focus Index (Reflects no deduction for fees, expenses or taxes)", "label": "S000069129 MSCI USA Extended ESG Focus Index [Member]" } } }, "auth_ref": [] }, "bf3_S000069129MSCIUSAIndexMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "S000069129MSCIUSAIndexMember", "presentation": [ "http://www.blackrock.com/16/role/PerformanceTableData", "http://www.blackrock.com/6/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "verboseLabel": "MSCI USA Index (Reflects no deduction for fees, expenses or taxes)", "label": "S000069129 MSCI USA Index [Member]" } } }, "auth_ref": [] }, "bf3_S000069129Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "S000069129Member", "presentation": [ "http://www.blackrock.com/16/role/BarChartData", "http://www.blackrock.com/16/role/ExpenseExample", "http://www.blackrock.com/16/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/16/role/FeesAndExpenses", "http://www.blackrock.com/16/role/InvestmentRisks", "http://www.blackrock.com/16/role/InvestmentStrategy", "http://www.blackrock.com/16/role/N1aSupplement", "http://www.blackrock.com/16/role/OperatingExpensesData", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/16/role/RiskReturn", "http://www.blackrock.com/16/role/ShareholderFeesData", "http://www.blackrock.com/6/role/BarChartData", "http://www.blackrock.com/6/role/ExpenseExample", "http://www.blackrock.com/6/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/6/role/FeesAndExpenses", "http://www.blackrock.com/6/role/InvestmentRisks", "http://www.blackrock.com/6/role/InvestmentStrategy", "http://www.blackrock.com/6/role/N1aSupplement", "http://www.blackrock.com/6/role/OperatingExpensesData", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/6/role/RiskReturn", "http://www.blackrock.com/6/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "verboseLabel": "BlackRock LifePath ESG Index 2050 Fund", "label": "S000069129 [Member]" } } }, "auth_ref": [] }, "bf3_S000069130BloombergUSAggregateBondIndexMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "S000069130BloombergUSAggregateBondIndexMember", "presentation": [ "http://www.blackrock.com/17/role/PerformanceTableData", "http://www.blackrock.com/7/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "verboseLabel": "Bloomberg U.S. Aggregate Bond Index (Reflects no deduction for fees, expenses or taxes)", "label": "S000069130 Bloomberg U S Aggregate Bond Index [Member]" } } }, "auth_ref": [] }, "bf3_S000069130LifePathESGIndex2055FundCustomBenchmarkMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "S000069130LifePathESGIndex2055FundCustomBenchmarkMember", "presentation": [ "http://www.blackrock.com/17/role/PerformanceTableData", "http://www.blackrock.com/7/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "verboseLabel": "LifePath ESG Index 2055 Fund Custom Benchmark (Reflects no deduction for fees, expenses or taxes except as noted)", "label": "S000069130 LifePath ESG Index 2055 Fund Custom Benchmark [Member]" } } }, "auth_ref": [] }, "bf3_S000069130MSCIUSAExtendedESGFocusIndexMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "S000069130MSCIUSAExtendedESGFocusIndexMember", "presentation": [ "http://www.blackrock.com/17/role/PerformanceTableData", "http://www.blackrock.com/7/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "verboseLabel": "MSCI USA Extended ESG Focus Index (Reflects no deduction for fees, expenses or taxes)", "label": "S000069130 MSCI USA Extended ESG Focus Index [Member]" } } }, "auth_ref": [] }, "bf3_S000069130MSCIUSAIndexMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "S000069130MSCIUSAIndexMember", "presentation": [ "http://www.blackrock.com/17/role/PerformanceTableData", "http://www.blackrock.com/7/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "verboseLabel": "MSCI USA Index (Reflects no deduction for fees, expenses or taxes)", "label": "S000069130 MSCI USA Index [Member]" } } }, "auth_ref": [] }, "bf3_S000069130Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "S000069130Member", "presentation": [ "http://www.blackrock.com/17/role/BarChartData", "http://www.blackrock.com/17/role/ExpenseExample", "http://www.blackrock.com/17/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/17/role/FeesAndExpenses", "http://www.blackrock.com/17/role/InvestmentRisks", "http://www.blackrock.com/17/role/InvestmentStrategy", "http://www.blackrock.com/17/role/N1aSupplement", "http://www.blackrock.com/17/role/OperatingExpensesData", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/17/role/RiskReturn", "http://www.blackrock.com/17/role/ShareholderFeesData", "http://www.blackrock.com/7/role/BarChartData", "http://www.blackrock.com/7/role/ExpenseExample", "http://www.blackrock.com/7/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/7/role/FeesAndExpenses", "http://www.blackrock.com/7/role/InvestmentRisks", "http://www.blackrock.com/7/role/InvestmentStrategy", "http://www.blackrock.com/7/role/N1aSupplement", "http://www.blackrock.com/7/role/OperatingExpensesData", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/7/role/RiskReturn", "http://www.blackrock.com/7/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "verboseLabel": "BlackRock LifePath ESG Index 2055 Fund", "label": "S000069130 [Member]" } } }, "auth_ref": [] }, "bf3_S000069131BloombergUSAggregateBondIndexMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "S000069131BloombergUSAggregateBondIndexMember", "presentation": [ "http://www.blackrock.com/18/role/PerformanceTableData", "http://www.blackrock.com/8/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "verboseLabel": "Bloomberg U.S. Aggregate Bond Index (Reflects no deduction for fees, expenses or taxes)", "label": "S000069131 Bloomberg U S Aggregate Bond Index [Member]" } } }, "auth_ref": [] }, "bf3_S000069131LifePathESGIndex2060FundCustomBenchmarkMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "S000069131LifePathESGIndex2060FundCustomBenchmarkMember", "presentation": [ "http://www.blackrock.com/18/role/PerformanceTableData", "http://www.blackrock.com/8/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "verboseLabel": "LifePath ESG Index 2060 Fund Custom Benchmark (Reflects no deduction for fees, expenses or taxes except as noted)", "label": "S000069131 LifePath ESG Index 2060 Fund Custom Benchmark [Member]" } } }, "auth_ref": [] }, "bf3_S000069131MSCIUSAExtendedESGFocusIndexMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "S000069131MSCIUSAExtendedESGFocusIndexMember", "presentation": [ "http://www.blackrock.com/18/role/PerformanceTableData", "http://www.blackrock.com/8/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "verboseLabel": "MSCI USA Extended ESG Focus Index (Reflects no deduction for fees, expenses or taxes)", "label": "S000069131 MSCI USA Extended ESG Focus Index [Member]" } } }, "auth_ref": [] }, "bf3_S000069131MSCIUSAIndexMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "S000069131MSCIUSAIndexMember", "presentation": [ "http://www.blackrock.com/18/role/PerformanceTableData", "http://www.blackrock.com/8/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "verboseLabel": "MSCI USA Index (Reflects no deduction for fees, expenses or taxes)", "label": "S000069131 MSCI USA Index [Member]" } } }, "auth_ref": [] }, "bf3_S000069131Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "S000069131Member", "presentation": [ "http://www.blackrock.com/18/role/BarChartData", "http://www.blackrock.com/18/role/ExpenseExample", "http://www.blackrock.com/18/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/18/role/FeesAndExpenses", "http://www.blackrock.com/18/role/InvestmentRisks", "http://www.blackrock.com/18/role/InvestmentStrategy", "http://www.blackrock.com/18/role/N1aSupplement", "http://www.blackrock.com/18/role/OperatingExpensesData", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/18/role/RiskReturn", "http://www.blackrock.com/18/role/ShareholderFeesData", "http://www.blackrock.com/8/role/BarChartData", "http://www.blackrock.com/8/role/ExpenseExample", "http://www.blackrock.com/8/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/8/role/FeesAndExpenses", "http://www.blackrock.com/8/role/InvestmentRisks", "http://www.blackrock.com/8/role/InvestmentStrategy", "http://www.blackrock.com/8/role/N1aSupplement", "http://www.blackrock.com/8/role/OperatingExpensesData", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/8/role/RiskReturn", "http://www.blackrock.com/8/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "verboseLabel": "BlackRock LifePath ESG Index 2060 Fund", "label": "S000069131 [Member]" } } }, "auth_ref": [] }, "bf3_S000086332BloombergUSAggregateBondIndex2Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "S000086332BloombergUSAggregateBondIndex2Member", "presentation": [ "http://www.blackrock.com/20/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "verboseLabel": "Bloomberg U.S. Aggregate Bond Index (Reflects no deduction for fees, expenses or taxes)", "label": "S000086332 Bloomberg U S Aggregate Bond Index2 [Member]" } } }, "auth_ref": [] }, "bf3_S000086332BloombergUSAggregateBondIndexMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "S000086332BloombergUSAggregateBondIndexMember", "presentation": [ "http://www.blackrock.com/10/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "verboseLabel": "Bloomberg U.S. Aggregate Bond Index (Reflects no deduction for fees, expenses or taxes)", "label": "S000086332 Bloomberg U S Aggregate Bond Index [Member]" } } }, "auth_ref": [] }, "bf3_S000086332LifePathESGIndex2070FundCustomBenchmark2Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "S000086332LifePathESGIndex2070FundCustomBenchmark2Member", "presentation": [ "http://www.blackrock.com/20/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "verboseLabel": "LifePath ESG Index 2070 Fund Custom Benchmark (Reflects no deduction for fees, expenses or taxes except as noted)", "label": "S000086332 Life Path E S G Index 2070 Fund Custom Benchmark2 [Member]" } } }, "auth_ref": [] }, "bf3_S000086332LifePathESGIndex2070FundCustomBenchmarkMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "S000086332LifePathESGIndex2070FundCustomBenchmarkMember", "presentation": [ "http://www.blackrock.com/10/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "verboseLabel": "LifePath ESG Index 2070 Fund Custom Benchmark (Reflects no deduction for fees, expenses or taxes except as noted)", "label": "S000086332 Life Path E S G Index 2070 Fund Custom Benchmark [Member]" } } }, "auth_ref": [] }, "bf3_S000086332MSCIUSAExtendedESGFocusIndex2Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "S000086332MSCIUSAExtendedESGFocusIndex2Member", "presentation": [ "http://www.blackrock.com/20/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "verboseLabel": "MSCI USA Extended ESG Focus Index (Reflects no deduction for fees, expenses or taxes)", "label": "S000086332 M S C I U S A Extended ESG Focus Index2 [Member]" } } }, "auth_ref": [] }, "bf3_S000086332MSCIUSAExtendedESGFocusIndexMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "S000086332MSCIUSAExtendedESGFocusIndexMember", "presentation": [ "http://www.blackrock.com/10/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "verboseLabel": "MSCI USA Extended ESG Focus Index (Reflects no deduction for fees, expenses or taxes)", "label": "S000086332 M S C I U S A Extended E S G Focus Index [Member]" } } }, "auth_ref": [] }, "bf3_S000086332MSCIUSAIndex2Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "S000086332MSCIUSAIndex2Member", "presentation": [ "http://www.blackrock.com/20/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "verboseLabel": "MSCI USA Index (Reflects no deduction for fees, expenses or taxes)", "label": "S000086332 M S C I U S A Index2 [Member]" } } }, "auth_ref": [] }, "bf3_S000086332MSCIUSAIndexMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "S000086332MSCIUSAIndexMember", "presentation": [ "http://www.blackrock.com/10/role/PerformanceTableData" ], "lang": { "en-us": { "role": { "verboseLabel": "MSCI USA Index (Reflects no deduction for fees, expenses or taxes)", "label": "S000086332 M S C I U S A Index [Member]" } } }, "auth_ref": [] }, "bf3_S000086332Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "S000086332Member", "presentation": [ "http://www.blackrock.com/10/role/BarChartData", "http://www.blackrock.com/10/role/ExpenseExample", "http://www.blackrock.com/10/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/10/role/FeesAndExpenses", "http://www.blackrock.com/10/role/InvestmentRisks", "http://www.blackrock.com/10/role/InvestmentStrategy", "http://www.blackrock.com/10/role/N1aSupplement", "http://www.blackrock.com/10/role/OperatingExpensesData", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/10/role/RiskReturn", "http://www.blackrock.com/10/role/ShareholderFeesData", "http://www.blackrock.com/20/role/BarChartData", "http://www.blackrock.com/20/role/ExpenseExample", "http://www.blackrock.com/20/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/20/role/FeesAndExpenses", "http://www.blackrock.com/20/role/InvestmentRisks", "http://www.blackrock.com/20/role/InvestmentStrategy", "http://www.blackrock.com/20/role/N1aSupplement", "http://www.blackrock.com/20/role/OperatingExpensesData", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/20/role/RiskReturn", "http://www.blackrock.com/20/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "verboseLabel": "BlackRock LifePath ESG Index 2070 Fund", "label": "S000086332 [Member]" } } }, "auth_ref": [] }, "oef_ShareClassDomain": { "xbrltype": "domainItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ShareClassDomain", "presentation": [ "http://www.blackrock.com/1/role/BarChartData", "http://www.blackrock.com/1/role/ExpenseExample", "http://www.blackrock.com/1/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/1/role/FeesAndExpenses", "http://www.blackrock.com/1/role/N1aSupplement", "http://www.blackrock.com/1/role/OperatingExpensesData", "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/1/role/PerformanceTableData", "http://www.blackrock.com/1/role/ShareholderFeesData", "http://www.blackrock.com/10/role/BarChartData", "http://www.blackrock.com/10/role/ExpenseExample", "http://www.blackrock.com/10/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/10/role/FeesAndExpenses", "http://www.blackrock.com/10/role/N1aSupplement", "http://www.blackrock.com/10/role/OperatingExpensesData", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/10/role/PerformanceTableData", "http://www.blackrock.com/10/role/ShareholderFeesData", "http://www.blackrock.com/11/role/BarChartData", "http://www.blackrock.com/11/role/ExpenseExample", "http://www.blackrock.com/11/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/11/role/FeesAndExpenses", "http://www.blackrock.com/11/role/N1aSupplement", "http://www.blackrock.com/11/role/OperatingExpensesData", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/11/role/PerformanceTableData", "http://www.blackrock.com/11/role/ShareholderFeesData", "http://www.blackrock.com/12/role/BarChartData", "http://www.blackrock.com/12/role/ExpenseExample", "http://www.blackrock.com/12/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/12/role/FeesAndExpenses", "http://www.blackrock.com/12/role/N1aSupplement", "http://www.blackrock.com/12/role/OperatingExpensesData", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/12/role/PerformanceTableData", "http://www.blackrock.com/12/role/ShareholderFeesData", "http://www.blackrock.com/13/role/BarChartData", "http://www.blackrock.com/13/role/ExpenseExample", "http://www.blackrock.com/13/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/13/role/FeesAndExpenses", "http://www.blackrock.com/13/role/N1aSupplement", "http://www.blackrock.com/13/role/OperatingExpensesData", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/13/role/PerformanceTableData", "http://www.blackrock.com/13/role/ShareholderFeesData", "http://www.blackrock.com/14/role/BarChartData", "http://www.blackrock.com/14/role/ExpenseExample", "http://www.blackrock.com/14/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/14/role/FeesAndExpenses", "http://www.blackrock.com/14/role/N1aSupplement", "http://www.blackrock.com/14/role/OperatingExpensesData", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/14/role/PerformanceTableData", "http://www.blackrock.com/14/role/ShareholderFeesData", "http://www.blackrock.com/15/role/BarChartData", "http://www.blackrock.com/15/role/ExpenseExample", "http://www.blackrock.com/15/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/15/role/FeesAndExpenses", "http://www.blackrock.com/15/role/N1aSupplement", "http://www.blackrock.com/15/role/OperatingExpensesData", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/15/role/PerformanceTableData", "http://www.blackrock.com/15/role/ShareholderFeesData", "http://www.blackrock.com/16/role/BarChartData", "http://www.blackrock.com/16/role/ExpenseExample", "http://www.blackrock.com/16/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/16/role/FeesAndExpenses", "http://www.blackrock.com/16/role/N1aSupplement", "http://www.blackrock.com/16/role/OperatingExpensesData", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/16/role/PerformanceTableData", "http://www.blackrock.com/16/role/ShareholderFeesData", "http://www.blackrock.com/17/role/BarChartData", "http://www.blackrock.com/17/role/ExpenseExample", "http://www.blackrock.com/17/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/17/role/FeesAndExpenses", "http://www.blackrock.com/17/role/N1aSupplement", "http://www.blackrock.com/17/role/OperatingExpensesData", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/17/role/PerformanceTableData", "http://www.blackrock.com/17/role/ShareholderFeesData", "http://www.blackrock.com/18/role/BarChartData", "http://www.blackrock.com/18/role/ExpenseExample", "http://www.blackrock.com/18/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/18/role/FeesAndExpenses", "http://www.blackrock.com/18/role/N1aSupplement", "http://www.blackrock.com/18/role/OperatingExpensesData", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/18/role/PerformanceTableData", "http://www.blackrock.com/18/role/ShareholderFeesData", "http://www.blackrock.com/19/role/BarChartData", "http://www.blackrock.com/19/role/ExpenseExample", "http://www.blackrock.com/19/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/19/role/FeesAndExpenses", "http://www.blackrock.com/19/role/N1aSupplement", "http://www.blackrock.com/19/role/OperatingExpensesData", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/19/role/PerformanceTableData", "http://www.blackrock.com/19/role/ShareholderFeesData", "http://www.blackrock.com/2/role/BarChartData", "http://www.blackrock.com/2/role/ExpenseExample", "http://www.blackrock.com/2/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/2/role/FeesAndExpenses", "http://www.blackrock.com/2/role/N1aSupplement", "http://www.blackrock.com/2/role/OperatingExpensesData", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/2/role/PerformanceTableData", "http://www.blackrock.com/2/role/ShareholderFeesData", "http://www.blackrock.com/20/role/BarChartData", "http://www.blackrock.com/20/role/ExpenseExample", "http://www.blackrock.com/20/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/20/role/FeesAndExpenses", "http://www.blackrock.com/20/role/N1aSupplement", "http://www.blackrock.com/20/role/OperatingExpensesData", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/20/role/PerformanceTableData", "http://www.blackrock.com/20/role/ShareholderFeesData", "http://www.blackrock.com/3/role/BarChartData", "http://www.blackrock.com/3/role/ExpenseExample", "http://www.blackrock.com/3/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/3/role/FeesAndExpenses", "http://www.blackrock.com/3/role/N1aSupplement", "http://www.blackrock.com/3/role/OperatingExpensesData", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/3/role/PerformanceTableData", "http://www.blackrock.com/3/role/ShareholderFeesData", "http://www.blackrock.com/4/role/BarChartData", "http://www.blackrock.com/4/role/ExpenseExample", "http://www.blackrock.com/4/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/4/role/FeesAndExpenses", "http://www.blackrock.com/4/role/N1aSupplement", "http://www.blackrock.com/4/role/OperatingExpensesData", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/4/role/PerformanceTableData", "http://www.blackrock.com/4/role/ShareholderFeesData", "http://www.blackrock.com/5/role/BarChartData", "http://www.blackrock.com/5/role/ExpenseExample", "http://www.blackrock.com/5/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/5/role/FeesAndExpenses", "http://www.blackrock.com/5/role/N1aSupplement", "http://www.blackrock.com/5/role/OperatingExpensesData", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/5/role/PerformanceTableData", "http://www.blackrock.com/5/role/ShareholderFeesData", "http://www.blackrock.com/6/role/BarChartData", "http://www.blackrock.com/6/role/ExpenseExample", "http://www.blackrock.com/6/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/6/role/FeesAndExpenses", "http://www.blackrock.com/6/role/N1aSupplement", "http://www.blackrock.com/6/role/OperatingExpensesData", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/6/role/PerformanceTableData", "http://www.blackrock.com/6/role/ShareholderFeesData", "http://www.blackrock.com/7/role/BarChartData", "http://www.blackrock.com/7/role/ExpenseExample", "http://www.blackrock.com/7/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/7/role/FeesAndExpenses", "http://www.blackrock.com/7/role/N1aSupplement", "http://www.blackrock.com/7/role/OperatingExpensesData", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/7/role/PerformanceTableData", "http://www.blackrock.com/7/role/ShareholderFeesData", "http://www.blackrock.com/8/role/BarChartData", "http://www.blackrock.com/8/role/ExpenseExample", "http://www.blackrock.com/8/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/8/role/FeesAndExpenses", "http://www.blackrock.com/8/role/N1aSupplement", "http://www.blackrock.com/8/role/OperatingExpensesData", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/8/role/PerformanceTableData", "http://www.blackrock.com/8/role/ShareholderFeesData", "http://www.blackrock.com/9/role/BarChartData", "http://www.blackrock.com/9/role/ExpenseExample", "http://www.blackrock.com/9/role/ExpenseExampleNoRedemption", "http://www.blackrock.com/9/role/FeesAndExpenses", "http://www.blackrock.com/9/role/N1aSupplement", "http://www.blackrock.com/9/role/OperatingExpensesData", "http://www.blackrock.com/9/role/PerformanceManagement", "http://www.blackrock.com/9/role/PerformanceTableData", "http://www.blackrock.com/9/role/ShareholderFeesData", "http://xbrl.sec.gov/rr/role/BarChartData", "http://xbrl.sec.gov/rr/role/ExpenseExample", "http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption", "http://xbrl.sec.gov/rr/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/N1aSupplement", "http://xbrl.sec.gov/rr/role/OperatingExpensesData", "http://xbrl.sec.gov/rr/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceTableData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "Share Classes" } } }, "auth_ref": [ "r4" ] }, "oef_ShareholderFeeOther": { "xbrltype": "nonNegativeMonetaryItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ShareholderFeeOther", "presentation": [ "http://www.blackrock.com/1/role/ShareholderFeesData", "http://www.blackrock.com/10/role/ShareholderFeesData", "http://www.blackrock.com/11/role/ShareholderFeesData", "http://www.blackrock.com/12/role/ShareholderFeesData", "http://www.blackrock.com/13/role/ShareholderFeesData", "http://www.blackrock.com/14/role/ShareholderFeesData", "http://www.blackrock.com/15/role/ShareholderFeesData", "http://www.blackrock.com/16/role/ShareholderFeesData", "http://www.blackrock.com/17/role/ShareholderFeesData", "http://www.blackrock.com/18/role/ShareholderFeesData", "http://www.blackrock.com/19/role/ShareholderFeesData", "http://www.blackrock.com/2/role/ShareholderFeesData", "http://www.blackrock.com/20/role/ShareholderFeesData", "http://www.blackrock.com/3/role/ShareholderFeesData", "http://www.blackrock.com/4/role/ShareholderFeesData", "http://www.blackrock.com/5/role/ShareholderFeesData", "http://www.blackrock.com/6/role/ShareholderFeesData", "http://www.blackrock.com/7/role/ShareholderFeesData", "http://www.blackrock.com/8/role/ShareholderFeesData", "http://www.blackrock.com/9/role/ShareholderFeesData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "Shareholder Fee, Other" } } }, "auth_ref": [ "r13" ] }, "oef_ShareholderFeesAbstract": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ShareholderFeesAbstract", "lang": { "en-us": { "role": { "label": "Shareholder Fees:" } } }, "auth_ref": [ "r13" ] }, "oef_ShareholderFeesCaption": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ShareholderFeesCaption", "presentation": [ "http://www.blackrock.com/1/role/FeesAndExpenses", "http://www.blackrock.com/10/role/FeesAndExpenses", "http://www.blackrock.com/11/role/FeesAndExpenses", "http://www.blackrock.com/12/role/FeesAndExpenses", "http://www.blackrock.com/13/role/FeesAndExpenses", "http://www.blackrock.com/14/role/FeesAndExpenses", "http://www.blackrock.com/15/role/FeesAndExpenses", "http://www.blackrock.com/16/role/FeesAndExpenses", "http://www.blackrock.com/17/role/FeesAndExpenses", "http://www.blackrock.com/18/role/FeesAndExpenses", "http://www.blackrock.com/19/role/FeesAndExpenses", "http://www.blackrock.com/2/role/FeesAndExpenses", "http://www.blackrock.com/20/role/FeesAndExpenses", "http://www.blackrock.com/3/role/FeesAndExpenses", "http://www.blackrock.com/4/role/FeesAndExpenses", "http://www.blackrock.com/5/role/FeesAndExpenses", "http://www.blackrock.com/6/role/FeesAndExpenses", "http://www.blackrock.com/7/role/FeesAndExpenses", "http://www.blackrock.com/8/role/FeesAndExpenses", "http://www.blackrock.com/9/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/FeesAndExpenses" ], "lang": { "en-us": { "role": { "label": "Shareholder Fees Caption [Optional Text]" } } }, "auth_ref": [ "r13" ] }, "oef_ShareholderFeesColumnName": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ShareholderFeesColumnName", "presentation": [ "http://www.blackrock.com/1/role/ShareholderFeesData", "http://www.blackrock.com/10/role/ShareholderFeesData", "http://www.blackrock.com/11/role/ShareholderFeesData", "http://www.blackrock.com/12/role/ShareholderFeesData", "http://www.blackrock.com/13/role/ShareholderFeesData", "http://www.blackrock.com/14/role/ShareholderFeesData", "http://www.blackrock.com/15/role/ShareholderFeesData", "http://www.blackrock.com/16/role/ShareholderFeesData", "http://www.blackrock.com/17/role/ShareholderFeesData", "http://www.blackrock.com/18/role/ShareholderFeesData", "http://www.blackrock.com/19/role/ShareholderFeesData", "http://www.blackrock.com/2/role/ShareholderFeesData", "http://www.blackrock.com/20/role/ShareholderFeesData", "http://www.blackrock.com/3/role/ShareholderFeesData", "http://www.blackrock.com/4/role/ShareholderFeesData", "http://www.blackrock.com/5/role/ShareholderFeesData", "http://www.blackrock.com/6/role/ShareholderFeesData", "http://www.blackrock.com/7/role/ShareholderFeesData", "http://www.blackrock.com/8/role/ShareholderFeesData", "http://www.blackrock.com/9/role/ShareholderFeesData", "http://xbrl.sec.gov/rr/role/ShareholderFeesData" ], "lang": { "en-us": { "role": { "label": "Shareholder Fees Column [Optional Text]" } } }, "auth_ref": [ "r13" ] }, "oef_ShareholderFeesTableTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ShareholderFeesTableTextBlock", "presentation": [ "http://www.blackrock.com/1/role/FeesAndExpenses", "http://www.blackrock.com/10/role/FeesAndExpenses", "http://www.blackrock.com/11/role/FeesAndExpenses", "http://www.blackrock.com/12/role/FeesAndExpenses", "http://www.blackrock.com/13/role/FeesAndExpenses", "http://www.blackrock.com/14/role/FeesAndExpenses", "http://www.blackrock.com/15/role/FeesAndExpenses", "http://www.blackrock.com/16/role/FeesAndExpenses", "http://www.blackrock.com/17/role/FeesAndExpenses", "http://www.blackrock.com/18/role/FeesAndExpenses", "http://www.blackrock.com/19/role/FeesAndExpenses", "http://www.blackrock.com/2/role/FeesAndExpenses", "http://www.blackrock.com/20/role/FeesAndExpenses", "http://www.blackrock.com/3/role/FeesAndExpenses", "http://www.blackrock.com/4/role/FeesAndExpenses", "http://www.blackrock.com/5/role/FeesAndExpenses", "http://www.blackrock.com/6/role/FeesAndExpenses", "http://www.blackrock.com/7/role/FeesAndExpenses", "http://www.blackrock.com/8/role/FeesAndExpenses", "http://www.blackrock.com/9/role/FeesAndExpenses", "http://xbrl.sec.gov/rr/role/FeesAndExpenses" ], "lang": { "en-us": { "role": { "label": "Shareholder Fees [Table]" } } }, "auth_ref": [ "r13" ] }, "bf3_SharesOfAnETFMayTradeAtPricesOtherThanNetAssetValueMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "SharesOfAnETFMayTradeAtPricesOtherThanNetAssetValueMember", "presentation": [ "http://www.blackrock.com/1/role/InvestmentRisks", "http://www.blackrock.com/10/role/InvestmentRisks", "http://www.blackrock.com/11/role/InvestmentRisks", "http://www.blackrock.com/12/role/InvestmentRisks", "http://www.blackrock.com/13/role/InvestmentRisks", "http://www.blackrock.com/14/role/InvestmentRisks", "http://www.blackrock.com/15/role/InvestmentRisks", "http://www.blackrock.com/16/role/InvestmentRisks", "http://www.blackrock.com/17/role/InvestmentRisks", "http://www.blackrock.com/18/role/InvestmentRisks", "http://www.blackrock.com/19/role/InvestmentRisks", "http://www.blackrock.com/2/role/InvestmentRisks", "http://www.blackrock.com/20/role/InvestmentRisks", "http://www.blackrock.com/3/role/InvestmentRisks", "http://www.blackrock.com/4/role/InvestmentRisks", "http://www.blackrock.com/5/role/InvestmentRisks", "http://www.blackrock.com/6/role/InvestmentRisks", "http://www.blackrock.com/7/role/InvestmentRisks", "http://www.blackrock.com/8/role/InvestmentRisks", "http://www.blackrock.com/9/role/InvestmentRisks" ], "lang": { "en-us": { "role": { "label": "Shares of an ETF May Trade at Prices Other Than Net Asset Value [Member]" } } }, "auth_ref": [] }, "bf3_SmallAndMidCapitalizationCompanyRiskMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "SmallAndMidCapitalizationCompanyRiskMember", "presentation": [ "http://www.blackrock.com/1/role/InvestmentRisks", "http://www.blackrock.com/10/role/InvestmentRisks", "http://www.blackrock.com/11/role/InvestmentRisks", "http://www.blackrock.com/12/role/InvestmentRisks", "http://www.blackrock.com/13/role/InvestmentRisks", "http://www.blackrock.com/14/role/InvestmentRisks", "http://www.blackrock.com/15/role/InvestmentRisks", "http://www.blackrock.com/16/role/InvestmentRisks", "http://www.blackrock.com/17/role/InvestmentRisks", "http://www.blackrock.com/18/role/InvestmentRisks", "http://www.blackrock.com/19/role/InvestmentRisks", "http://www.blackrock.com/2/role/InvestmentRisks", "http://www.blackrock.com/20/role/InvestmentRisks", "http://www.blackrock.com/3/role/InvestmentRisks", "http://www.blackrock.com/4/role/InvestmentRisks", "http://www.blackrock.com/5/role/InvestmentRisks", "http://www.blackrock.com/6/role/InvestmentRisks", "http://www.blackrock.com/7/role/InvestmentRisks", "http://www.blackrock.com/8/role/InvestmentRisks", "http://www.blackrock.com/9/role/InvestmentRisks" ], "lang": { "en-us": { "role": { "label": "Small and Mid Capitalization Company Risk [Member]" } } }, "auth_ref": [] }, "oef_StrategyHeading": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "StrategyHeading", "presentation": [ "http://www.blackrock.com/1/role/InvestmentStrategy", "http://www.blackrock.com/10/role/InvestmentStrategy", "http://www.blackrock.com/11/role/InvestmentStrategy", "http://www.blackrock.com/12/role/InvestmentStrategy", "http://www.blackrock.com/13/role/InvestmentStrategy", "http://www.blackrock.com/14/role/InvestmentStrategy", "http://www.blackrock.com/15/role/InvestmentStrategy", "http://www.blackrock.com/16/role/InvestmentStrategy", "http://www.blackrock.com/17/role/InvestmentStrategy", "http://www.blackrock.com/18/role/InvestmentStrategy", "http://www.blackrock.com/19/role/InvestmentStrategy", "http://www.blackrock.com/2/role/InvestmentStrategy", "http://www.blackrock.com/20/role/InvestmentStrategy", "http://www.blackrock.com/3/role/InvestmentStrategy", "http://www.blackrock.com/4/role/InvestmentStrategy", "http://www.blackrock.com/5/role/InvestmentStrategy", "http://www.blackrock.com/6/role/InvestmentStrategy", "http://www.blackrock.com/7/role/InvestmentStrategy", "http://www.blackrock.com/8/role/InvestmentStrategy", "http://www.blackrock.com/9/role/InvestmentStrategy", "http://xbrl.sec.gov/rr/role/InvestmentStrategy" ], "lang": { "en-us": { "role": { "label": "Strategy [Heading]" } } }, "auth_ref": [ "r35" ] }, "oef_StrategyNarrativeTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "StrategyNarrativeTextBlock", "presentation": [ "http://www.blackrock.com/1/role/InvestmentStrategy", "http://www.blackrock.com/10/role/InvestmentStrategy", "http://www.blackrock.com/11/role/InvestmentStrategy", "http://www.blackrock.com/12/role/InvestmentStrategy", "http://www.blackrock.com/13/role/InvestmentStrategy", "http://www.blackrock.com/14/role/InvestmentStrategy", "http://www.blackrock.com/15/role/InvestmentStrategy", "http://www.blackrock.com/16/role/InvestmentStrategy", "http://www.blackrock.com/17/role/InvestmentStrategy", "http://www.blackrock.com/18/role/InvestmentStrategy", "http://www.blackrock.com/19/role/InvestmentStrategy", "http://www.blackrock.com/2/role/InvestmentStrategy", "http://www.blackrock.com/20/role/InvestmentStrategy", "http://www.blackrock.com/3/role/InvestmentStrategy", "http://www.blackrock.com/4/role/InvestmentStrategy", "http://www.blackrock.com/5/role/InvestmentStrategy", "http://www.blackrock.com/6/role/InvestmentStrategy", "http://www.blackrock.com/7/role/InvestmentStrategy", "http://www.blackrock.com/8/role/InvestmentStrategy", "http://www.blackrock.com/9/role/InvestmentStrategy", "http://xbrl.sec.gov/rr/role/InvestmentStrategy" ], "lang": { "en-us": { "role": { "label": "Strategy Narrative [Text Block]" } } }, "auth_ref": [ "r35" ] }, "oef_StrategyPortfolioConcentration": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "StrategyPortfolioConcentration", "presentation": [ "http://www.blackrock.com/1/role/InvestmentStrategy", "http://www.blackrock.com/10/role/InvestmentStrategy", "http://www.blackrock.com/11/role/InvestmentStrategy", "http://www.blackrock.com/12/role/InvestmentStrategy", "http://www.blackrock.com/13/role/InvestmentStrategy", "http://www.blackrock.com/14/role/InvestmentStrategy", "http://www.blackrock.com/15/role/InvestmentStrategy", "http://www.blackrock.com/16/role/InvestmentStrategy", "http://www.blackrock.com/17/role/InvestmentStrategy", "http://www.blackrock.com/18/role/InvestmentStrategy", "http://www.blackrock.com/19/role/InvestmentStrategy", "http://www.blackrock.com/2/role/InvestmentStrategy", "http://www.blackrock.com/20/role/InvestmentStrategy", "http://www.blackrock.com/3/role/InvestmentStrategy", "http://www.blackrock.com/4/role/InvestmentStrategy", "http://www.blackrock.com/5/role/InvestmentStrategy", "http://www.blackrock.com/6/role/InvestmentStrategy", "http://www.blackrock.com/7/role/InvestmentStrategy", "http://www.blackrock.com/8/role/InvestmentStrategy", "http://www.blackrock.com/9/role/InvestmentStrategy", "http://xbrl.sec.gov/rr/role/InvestmentStrategy" ], "lang": { "en-us": { "role": { "label": "Strategy Portfolio Concentration [Text]" } } }, "auth_ref": [ "r35" ] }, "oef_SupplementToProspectusTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "SupplementToProspectusTextBlock", "presentation": [ "http://www.blackrock.com/1/role/N1aSupplement", "http://www.blackrock.com/10/role/N1aSupplement", "http://www.blackrock.com/11/role/N1aSupplement", "http://www.blackrock.com/12/role/N1aSupplement", "http://www.blackrock.com/13/role/N1aSupplement", "http://www.blackrock.com/14/role/N1aSupplement", "http://www.blackrock.com/15/role/N1aSupplement", "http://www.blackrock.com/16/role/N1aSupplement", "http://www.blackrock.com/17/role/N1aSupplement", "http://www.blackrock.com/18/role/N1aSupplement", "http://www.blackrock.com/19/role/N1aSupplement", "http://www.blackrock.com/2/role/N1aSupplement", "http://www.blackrock.com/20/role/N1aSupplement", "http://www.blackrock.com/3/role/N1aSupplement", "http://www.blackrock.com/4/role/N1aSupplement", "http://www.blackrock.com/5/role/N1aSupplement", "http://www.blackrock.com/6/role/N1aSupplement", "http://www.blackrock.com/7/role/N1aSupplement", "http://www.blackrock.com/8/role/N1aSupplement", "http://www.blackrock.com/9/role/N1aSupplement", "http://xbrl.sec.gov/rr/role/N1aSupplement" ], "lang": { "en-us": { "role": { "label": "Supplement to Prospectus [Text Block]" } } }, "auth_ref": [ "r2" ] }, "oef_ThirtyDayTaxEquivalentYield": { "xbrltype": "pureItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ThirtyDayTaxEquivalentYield", "presentation": [ "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/9/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Thirty Day Tax Equivalent Yield" } } }, "auth_ref": [ "r52" ] }, "oef_ThirtyDayYield": { "xbrltype": "pureItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ThirtyDayYield", "presentation": [ "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/9/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Thirty Day Yield" } } }, "auth_ref": [ "r52" ] }, "oef_ThirtyDayYieldCaption": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ThirtyDayYieldCaption", "presentation": [ "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/9/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Thirty Day Yield Caption [Optional Text]" } } }, "auth_ref": [ "r52" ] }, "oef_ThirtyDayYieldColumnName": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ThirtyDayYieldColumnName", "presentation": [ "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/9/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Thirty Day Yield Column [Optional Text]" } } }, "auth_ref": [ "r52" ] }, "oef_ThirtyDayYieldPhone": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ThirtyDayYieldPhone", "presentation": [ "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/9/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Thirty Day Yield Phone" } } }, "auth_ref": [ "r52" ] }, "bf3_TrackingErrorRiskMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "TrackingErrorRiskMember", "presentation": [ "http://www.blackrock.com/1/role/InvestmentRisks", "http://www.blackrock.com/10/role/InvestmentRisks", "http://www.blackrock.com/11/role/InvestmentRisks", "http://www.blackrock.com/12/role/InvestmentRisks", "http://www.blackrock.com/13/role/InvestmentRisks", "http://www.blackrock.com/14/role/InvestmentRisks", "http://www.blackrock.com/15/role/InvestmentRisks", "http://www.blackrock.com/16/role/InvestmentRisks", "http://www.blackrock.com/17/role/InvestmentRisks", "http://www.blackrock.com/18/role/InvestmentRisks", "http://www.blackrock.com/19/role/InvestmentRisks", "http://www.blackrock.com/2/role/InvestmentRisks", "http://www.blackrock.com/20/role/InvestmentRisks", "http://www.blackrock.com/3/role/InvestmentRisks", "http://www.blackrock.com/4/role/InvestmentRisks", "http://www.blackrock.com/5/role/InvestmentRisks", "http://www.blackrock.com/6/role/InvestmentRisks", "http://www.blackrock.com/7/role/InvestmentRisks", "http://www.blackrock.com/8/role/InvestmentRisks", "http://www.blackrock.com/9/role/InvestmentRisks" ], "lang": { "en-us": { "role": { "label": "Tracking Error Risk [Member]" } } }, "auth_ref": [] }, "bf3_TreasuryObligationsRiskMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "TreasuryObligationsRiskMember", "presentation": [ "http://www.blackrock.com/1/role/InvestmentRisks", "http://www.blackrock.com/10/role/InvestmentRisks", "http://www.blackrock.com/11/role/InvestmentRisks", "http://www.blackrock.com/12/role/InvestmentRisks", "http://www.blackrock.com/13/role/InvestmentRisks", "http://www.blackrock.com/14/role/InvestmentRisks", "http://www.blackrock.com/15/role/InvestmentRisks", "http://www.blackrock.com/16/role/InvestmentRisks", "http://www.blackrock.com/17/role/InvestmentRisks", "http://www.blackrock.com/18/role/InvestmentRisks", "http://www.blackrock.com/19/role/InvestmentRisks", "http://www.blackrock.com/2/role/InvestmentRisks", "http://www.blackrock.com/20/role/InvestmentRisks", "http://www.blackrock.com/3/role/InvestmentRisks", "http://www.blackrock.com/4/role/InvestmentRisks", "http://www.blackrock.com/5/role/InvestmentRisks", "http://www.blackrock.com/6/role/InvestmentRisks", "http://www.blackrock.com/7/role/InvestmentRisks", "http://www.blackrock.com/8/role/InvestmentRisks", "http://www.blackrock.com/9/role/InvestmentRisks" ], "lang": { "en-us": { "role": { "label": "Treasury Obligations Risk [Member]" } } }, "auth_ref": [] }, "bf3_USAgencyMortgageBackedSecuritiesRiskMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "USAgencyMortgageBackedSecuritiesRiskMember", "presentation": [ "http://www.blackrock.com/1/role/InvestmentRisks", "http://www.blackrock.com/10/role/InvestmentRisks", "http://www.blackrock.com/11/role/InvestmentRisks", "http://www.blackrock.com/12/role/InvestmentRisks", "http://www.blackrock.com/13/role/InvestmentRisks", "http://www.blackrock.com/14/role/InvestmentRisks", "http://www.blackrock.com/15/role/InvestmentRisks", "http://www.blackrock.com/16/role/InvestmentRisks", "http://www.blackrock.com/17/role/InvestmentRisks", "http://www.blackrock.com/18/role/InvestmentRisks", "http://www.blackrock.com/19/role/InvestmentRisks", "http://www.blackrock.com/2/role/InvestmentRisks", "http://www.blackrock.com/20/role/InvestmentRisks", "http://www.blackrock.com/3/role/InvestmentRisks", "http://www.blackrock.com/4/role/InvestmentRisks", "http://www.blackrock.com/5/role/InvestmentRisks", "http://www.blackrock.com/6/role/InvestmentRisks", "http://www.blackrock.com/7/role/InvestmentRisks", "http://www.blackrock.com/8/role/InvestmentRisks", "http://www.blackrock.com/9/role/InvestmentRisks" ], "lang": { "en-us": { "role": { "label": "U S Agency Mortgage Backed Securities Risk [Member]" } } }, "auth_ref": [] }, "bf3_USGovernmentObligationsRiskMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "USGovernmentObligationsRiskMember", "presentation": [ "http://www.blackrock.com/1/role/InvestmentRisks", "http://www.blackrock.com/10/role/InvestmentRisks", "http://www.blackrock.com/11/role/InvestmentRisks", "http://www.blackrock.com/12/role/InvestmentRisks", "http://www.blackrock.com/13/role/InvestmentRisks", "http://www.blackrock.com/14/role/InvestmentRisks", "http://www.blackrock.com/15/role/InvestmentRisks", "http://www.blackrock.com/16/role/InvestmentRisks", "http://www.blackrock.com/17/role/InvestmentRisks", "http://www.blackrock.com/18/role/InvestmentRisks", "http://www.blackrock.com/19/role/InvestmentRisks", "http://www.blackrock.com/2/role/InvestmentRisks", "http://www.blackrock.com/20/role/InvestmentRisks", "http://www.blackrock.com/3/role/InvestmentRisks", "http://www.blackrock.com/4/role/InvestmentRisks", "http://www.blackrock.com/5/role/InvestmentRisks", "http://www.blackrock.com/6/role/InvestmentRisks", "http://www.blackrock.com/7/role/InvestmentRisks", "http://www.blackrock.com/8/role/InvestmentRisks", "http://www.blackrock.com/9/role/InvestmentRisks" ], "lang": { "en-us": { "role": { "label": "U S Government Obligations Risk [Member]" } } }, "auth_ref": [] }, "bf3_ValuationRiskMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "ValuationRiskMember", "presentation": [ "http://www.blackrock.com/1/role/InvestmentRisks", "http://www.blackrock.com/10/role/InvestmentRisks", "http://www.blackrock.com/11/role/InvestmentRisks", "http://www.blackrock.com/12/role/InvestmentRisks", "http://www.blackrock.com/13/role/InvestmentRisks", "http://www.blackrock.com/14/role/InvestmentRisks", "http://www.blackrock.com/15/role/InvestmentRisks", "http://www.blackrock.com/16/role/InvestmentRisks", "http://www.blackrock.com/17/role/InvestmentRisks", "http://www.blackrock.com/18/role/InvestmentRisks", "http://www.blackrock.com/19/role/InvestmentRisks", "http://www.blackrock.com/2/role/InvestmentRisks", "http://www.blackrock.com/20/role/InvestmentRisks", "http://www.blackrock.com/3/role/InvestmentRisks", "http://www.blackrock.com/4/role/InvestmentRisks", "http://www.blackrock.com/5/role/InvestmentRisks", "http://www.blackrock.com/6/role/InvestmentRisks", "http://www.blackrock.com/7/role/InvestmentRisks", "http://www.blackrock.com/8/role/InvestmentRisks", "http://www.blackrock.com/9/role/InvestmentRisks" ], "lang": { "en-us": { "role": { "label": "Valuation Risk [Member]" } } }, "auth_ref": [] }, "oef_YearToDateReturnLabel": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "YearToDateReturnLabel", "presentation": [ "http://www.blackrock.com/1/role/PerformanceManagement", "http://www.blackrock.com/10/role/PerformanceManagement", "http://www.blackrock.com/11/role/PerformanceManagement", "http://www.blackrock.com/12/role/PerformanceManagement", "http://www.blackrock.com/13/role/PerformanceManagement", "http://www.blackrock.com/14/role/PerformanceManagement", "http://www.blackrock.com/15/role/PerformanceManagement", "http://www.blackrock.com/16/role/PerformanceManagement", "http://www.blackrock.com/17/role/PerformanceManagement", "http://www.blackrock.com/18/role/PerformanceManagement", "http://www.blackrock.com/19/role/PerformanceManagement", "http://www.blackrock.com/2/role/PerformanceManagement", "http://www.blackrock.com/20/role/PerformanceManagement", "http://www.blackrock.com/3/role/PerformanceManagement", "http://www.blackrock.com/4/role/PerformanceManagement", "http://www.blackrock.com/5/role/PerformanceManagement", "http://www.blackrock.com/6/role/PerformanceManagement", "http://www.blackrock.com/7/role/PerformanceManagement", "http://www.blackrock.com/8/role/PerformanceManagement", "http://www.blackrock.com/9/role/PerformanceManagement", "http://xbrl.sec.gov/rr/role/PerformanceManagement" ], "lang": { "en-us": { "role": { "label": "Year to Date Return, Label [Optional Text]" } } }, "auth_ref": [ "r44" ] } } } }, "std_ref": { "r0": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Exchange Act", "Number": "240", "Section": "12", "Subsection": "b-2" }, "r1": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A" }, "r2": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "1" }, "r3": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "1", "Subsection": "a" }, "r4": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "1", "Subsection": "a", "Paragraph": "1" }, "r5": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "1", "Subsection": "a", "Paragraph": "3" }, "r6": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "2", "Subsection": "a" }, "r7": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "27A", "Subsection": "d", "Paragraph": "2", "Subparagraph": "i" }, "r8": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "27A", "Subsection": "d", "Paragraph": "2", "Subparagraph": "iiii", "Clause": "A" }, "r9": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "27A", "Subsection": "d", "Paragraph": "2", "Subparagraph": "instruction", "Clause": "7" }, "r10": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "27A", "Subsection": "e" }, "r11": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "3", "Subsection": "instruction", "Paragraph": "1" }, "r12": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "3", "Subsection": "instruction", "Paragraph": "1", "Subparagraph": "b" }, "r13": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "3", "Subsection": "instruction", "Paragraph": "2" }, "r14": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "3", "Subsection": "instruction", "Paragraph": "2", "Subparagraph": "a", "Sentence": "i" }, "r15": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "3", "Subsection": "instruction", "Paragraph": "2", "Subparagraph": "c" }, "r16": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "3", "Subsection": "instruction", "Paragraph": "2", "Subparagraph": "d" }, "r17": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "3", "Subsection": "instruction", "Paragraph": "3" }, "r18": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "3", "Subsection": "instruction", "Paragraph": "3", "Subparagraph": "a" }, "r19": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "3", "Subsection": "instruction", "Paragraph": "3", "Subparagraph": "b" }, "r20": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "3", "Subsection": "instruction", "Paragraph": "3", "Subparagraph": "c", "Sentence": "i" }, "r21": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "3", "Subsection": "instruction", "Paragraph": "3", "Subparagraph": "c", "Sentence": "ii" }, "r22": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "3", "Subsection": "instruction", "Paragraph": "3", "Subparagraph": "c", "Sentence": "iii" }, "r23": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "3", "Subsection": "instruction", "Paragraph": "3", "Subparagraph": "d" }, "r24": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "3", "Subsection": "instruction", "Paragraph": "3", "Subparagraph": "d", "Clause": "B", "Sentence": "ii" }, "r25": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "3", "Subsection": "instruction", "Paragraph": "3", "Subparagraph": "d", "Sentence": "iii" }, "r26": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "3", "Subsection": "instruction", "Paragraph": "3", "Subparagraph": "e" }, "r27": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "3", "Subsection": "instruction", "Paragraph": "3", "Subparagraph": "f", "Sentence": "i" }, "r28": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "3", "Subsection": "instruction", "Paragraph": "3", "Subparagraph": "f", "Sentence": "vi" }, "r29": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "3", "Subsection": "instruction", "Paragraph": "3", "Subparagraph": "f", "Sentence": "vii" }, "r30": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "3", "Subsection": "instruction", "Paragraph": "4" }, "r31": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "3", "Subsection": "instruction", "Paragraph": "4", "Subparagraph": "f" }, "r32": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "3", "Subsection": "instruction", "Paragraph": "5" }, "r33": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "3", "Subsection": "instruction", "Paragraph": "6", "Subparagraph": "a" }, "r34": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "3", "Subsection": "instrution", "Paragraph": "3" }, "r35": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "4", "Subsection": "a" }, "r36": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "4", "Subsection": "b", "Paragraph": "1" }, "r37": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "4", "Subsection": "b", "Paragraph": "1", "Subparagraph": "i", "Clause": "instruction" }, "r38": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "4", "Subsection": "b", "Paragraph": "1", "Subparagraph": "ii" }, "r39": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "4", "Subsection": "b", "Paragraph": "1", "Subparagraph": "ii", "Clause": "A" }, "r40": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "4", "Subsection": "b", "Paragraph": "1", "Subparagraph": "iii" }, "r41": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "4", "Subsection": "b", "Paragraph": "1", "Subparagraph": "iv" }, "r42": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "4", "Subsection": "b", "Paragraph": "2" }, "r43": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "4", "Subsection": "b", "Paragraph": "2", "Subparagraph": "i" }, "r44": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "4", "Subsection": "b", "Paragraph": "2", "Subparagraph": "ii" }, "r45": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "4", "Subsection": "b", "Paragraph": "2", "Subparagraph": "ii", "Sentence": "instruction", "Clause": "1", "Subclause": "a" }, "r46": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "4", "Subsection": "b", "Paragraph": "2", "Subparagraph": "ii", "Sentence": "instruction", "Clause": "3", "Subclause": "b" }, "r47": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "4", "Subsection": "b", "Paragraph": "2", "Subparagraph": "ii", "Sentence": "instruction", "Clause": "3", "Subclause": "c" }, "r48": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "4", "Subsection": "b", "Paragraph": "2", "Subparagraph": "iii" }, "r49": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "4", "Subsection": "b", "Paragraph": "2", "Subparagraph": "instruction", "Clause": "3" }, "r50": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "4", "Subsection": "b", "Paragraph": "2", "Subparagraph": "instruction", "Clause": "3", "Subclause": "c" }, "r51": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "4", "Subsection": "b", "Paragraph": "2", "Subparagraph": "instruction", "Clause": "a", "Sentence": "2" }, "r52": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "4", "Subsection": "b", "Paragraph": "2", "Subparagraph": "instruction", "Clause": "d", "Sentence": "2" }, "r53": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "4", "Subsection": "b", "Paragraph": "2", "Subparagraph": "iv" }, "r54": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "4", "Subsection": "b", "Paragraph": "2", "Subparagraph": "iv", "Clause": "C" }, "r55": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "4", "Subsection": "b", "Paragraph": "2", "Subparagraph": "iv", "Clause": "c", "Sentence": "2" }, "r56": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "4", "Subsection": "b", "Paragraph": "2", "Subparagraph": "iv", "Sentence": "A" }, "r57": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "4", "Subsection": "b", "Paragraph": "2", "Subparagraph": "iv", "Sentence": "B" }, "r58": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "4", "Subsection": "b", "Paragraph": "2", "Subparagraph": "iv", "Sentence": "D" }, "r59": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Regulation S-T", "Number": "232", "Section": "313" }, "r60": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Section": "2", "Name": "Form N-1A", "Subsection": "a" } } }