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Disclosure - S000002876 [Member] Expense Example, No Redemption link:presentationLink link:definitionLink link:calculationLink 120045 - Disclosure - S000002876 [Member] Risks Data link:presentationLink link:definitionLink link:calculationLink 120050 - Disclosure - S000002876 [Member] Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 120060 - Disclosure - S000002876 [Member] Average Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 120070 - Disclosure - S000002876 [Member] Market Index Performance link:presentationLink link:definitionLink link:calculationLink 110000 - Disclosure - S000002876 [Member] N-1A Cover link:presentationLink link:definitionLink link:calculationLink 110001 - Disclosure - S000002876 [Member] N-1A Supplement link:presentationLink link:definitionLink link:calculationLink 210002 - Disclosure - S000045356 [Member] Investment Objectives and Goals link:presentationLink link:definitionLink link:calculationLink 210003 - 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Disclosure - S000045356 [Member] Risks Data link:presentationLink link:definitionLink link:calculationLink 220050 - Disclosure - S000045356 [Member] Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 220060 - Disclosure - S000045356 [Member] Average Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 220070 - Disclosure - S000045356 [Member] Market Index Performance link:presentationLink link:definitionLink link:calculationLink 210000 - Disclosure - S000045356 [Member] N-1A Cover link:presentationLink link:definitionLink link:calculationLink 210001 - Disclosure - S000045356 [Member] N-1A Supplement link:presentationLink link:definitionLink link:calculationLink 310002 - Disclosure - S000002878 [Member] Investment Objectives and Goals link:presentationLink link:definitionLink link:calculationLink 310003 - Disclosure - S000002878 [Member] Fees and Expenses link:presentationLink link:definitionLink link:calculationLink 310004 - Disclosure - S000002878 [Member] Investment Strategy link:presentationLink link:definitionLink link:calculationLink 310005 - Disclosure - S000002878 [Member] Investment Risks link:presentationLink link:definitionLink link:calculationLink 310006 - Disclosure - S000002878 [Member] Performance Management link:presentationLink link:definitionLink link:calculationLink 320010 - Disclosure - S000002878 [Member] Shareholder Fees link:presentationLink link:definitionLink link:calculationLink 320020 - Disclosure - S000002878 [Member] Annual Fund Operating Expenses link:presentationLink link:definitionLink link:calculationLink 320030 - Disclosure - S000002878 [Member] Expense Example link:presentationLink link:definitionLink link:calculationLink 320040 - Disclosure - S000002878 [Member] Expense Example, No Redemption link:presentationLink link:definitionLink link:calculationLink 320045 - Disclosure - S000002878 [Member] Risks Data link:presentationLink link:definitionLink link:calculationLink 320050 - Disclosure - S000002878 [Member] Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 320060 - Disclosure - S000002878 [Member] Average Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 320070 - Disclosure - S000002878 [Member] Market Index Performance link:presentationLink link:definitionLink link:calculationLink 310000 - Disclosure - S000002878 [Member] N-1A Cover link:presentationLink link:definitionLink link:calculationLink 310001 - Disclosure - S000002878 [Member] N-1A Supplement link:presentationLink link:definitionLink link:calculationLink 410002 - Disclosure - S000002879 [Member] Investment Objectives and Goals link:presentationLink link:definitionLink link:calculationLink 410003 - Disclosure - S000002879 [Member] Fees and Expenses link:presentationLink link:definitionLink link:calculationLink 410004 - Disclosure - S000002879 [Member] Investment Strategy link:presentationLink link:definitionLink link:calculationLink 410005 - Disclosure - S000002879 [Member] Investment Risks link:presentationLink link:definitionLink link:calculationLink 410006 - Disclosure - S000002879 [Member] Performance Management link:presentationLink link:definitionLink link:calculationLink 420010 - Disclosure - S000002879 [Member] Shareholder Fees link:presentationLink link:definitionLink link:calculationLink 420020 - Disclosure - S000002879 [Member] Annual Fund Operating Expenses link:presentationLink link:definitionLink link:calculationLink 420030 - Disclosure - S000002879 [Member] Expense Example link:presentationLink link:definitionLink link:calculationLink 420040 - Disclosure - S000002879 [Member] Expense Example, No Redemption link:presentationLink link:definitionLink link:calculationLink 420045 - Disclosure - S000002879 [Member] Risks Data link:presentationLink link:definitionLink link:calculationLink 420050 - Disclosure - S000002879 [Member] Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 420060 - Disclosure - S000002879 [Member] Average Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 420070 - Disclosure - S000002879 [Member] Market Index Performance link:presentationLink link:definitionLink link:calculationLink 410000 - Disclosure - S000002879 [Member] N-1A Cover link:presentationLink link:definitionLink link:calculationLink 410001 - Disclosure - S000002879 [Member] N-1A Supplement link:presentationLink link:definitionLink link:calculationLink 510002 - Disclosure - S000002882 [Member] Investment Objectives and Goals link:presentationLink link:definitionLink link:calculationLink 510003 - Disclosure - S000002882 [Member] Fees and Expenses link:presentationLink link:definitionLink link:calculationLink 510004 - Disclosure - S000002882 [Member] Investment Strategy link:presentationLink link:definitionLink link:calculationLink 510005 - Disclosure - S000002882 [Member] Investment Risks link:presentationLink link:definitionLink link:calculationLink 510006 - Disclosure - S000002882 [Member] Performance Management link:presentationLink link:definitionLink link:calculationLink 520010 - Disclosure - S000002882 [Member] Shareholder Fees link:presentationLink link:definitionLink link:calculationLink 520020 - Disclosure - S000002882 [Member] Annual Fund Operating Expenses link:presentationLink link:definitionLink link:calculationLink 520030 - Disclosure - S000002882 [Member] Expense Example link:presentationLink link:definitionLink link:calculationLink 520040 - Disclosure - S000002882 [Member] Expense Example, No Redemption link:presentationLink link:definitionLink link:calculationLink 520045 - Disclosure - S000002882 [Member] Risks Data link:presentationLink link:definitionLink link:calculationLink 520050 - Disclosure - S000002882 [Member] Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 520060 - Disclosure - S000002882 [Member] Average Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 520070 - Disclosure - S000002882 [Member] Market Index Performance link:presentationLink link:definitionLink link:calculationLink 510000 - Disclosure - S000002882 [Member] N-1A Cover link:presentationLink link:definitionLink link:calculationLink 510001 - Disclosure - S000002882 [Member] N-1A Supplement link:presentationLink link:definitionLink link:calculationLink 610002 - Disclosure - S000002885 [Member] Investment Objectives and Goals link:presentationLink link:definitionLink link:calculationLink 610003 - Disclosure - S000002885 [Member] Fees and Expenses link:presentationLink link:definitionLink link:calculationLink 610004 - Disclosure - S000002885 [Member] Investment Strategy link:presentationLink link:definitionLink link:calculationLink 610005 - Disclosure - S000002885 [Member] Investment Risks link:presentationLink link:definitionLink link:calculationLink 610006 - Disclosure - S000002885 [Member] Performance Management link:presentationLink link:definitionLink link:calculationLink 620010 - 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Disclosure - S000002885 [Member] N-1A Cover link:presentationLink link:definitionLink link:calculationLink 610001 - Disclosure - S000002885 [Member] N-1A Supplement link:presentationLink link:definitionLink link:calculationLink 710002 - Disclosure - S000002880 [Member] Investment Objectives and Goals link:presentationLink link:definitionLink link:calculationLink 710003 - Disclosure - S000002880 [Member] Fees and Expenses link:presentationLink link:definitionLink link:calculationLink 710004 - Disclosure - S000002880 [Member] Investment Strategy link:presentationLink link:definitionLink link:calculationLink 710005 - Disclosure - S000002880 [Member] Investment Risks link:presentationLink link:definitionLink link:calculationLink 710006 - Disclosure - S000002880 [Member] Performance Management link:presentationLink link:definitionLink link:calculationLink 720010 - Disclosure - S000002880 [Member] Shareholder Fees link:presentationLink link:definitionLink link:calculationLink 720020 - Disclosure - 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Disclosure - S000002880 [Member] N-1A Supplement link:presentationLink link:definitionLink link:calculationLink 810002 - Disclosure - S000002887 [Member] Investment Objectives and Goals link:presentationLink link:definitionLink link:calculationLink 810003 - Disclosure - S000002887 [Member] Fees and Expenses link:presentationLink link:definitionLink link:calculationLink 810004 - Disclosure - S000002887 [Member] Investment Strategy link:presentationLink link:definitionLink link:calculationLink 810005 - Disclosure - S000002887 [Member] Investment Risks link:presentationLink link:definitionLink link:calculationLink 810006 - Disclosure - S000002887 [Member] Performance Management link:presentationLink link:definitionLink link:calculationLink 820010 - Disclosure - S000002887 [Member] Shareholder Fees link:presentationLink link:definitionLink link:calculationLink 820020 - Disclosure - S000002887 [Member] Annual Fund Operating Expenses link:presentationLink link:definitionLink link:calculationLink 820030 - Disclosure - S000002887 [Member] Expense Example link:presentationLink link:definitionLink link:calculationLink 820040 - Disclosure - S000002887 [Member] Expense Example, No Redemption link:presentationLink link:definitionLink link:calculationLink 820045 - Disclosure - S000002887 [Member] Risks Data link:presentationLink link:definitionLink link:calculationLink 820050 - Disclosure - S000002887 [Member] Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 820060 - Disclosure - S000002887 [Member] Average Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 820070 - Disclosure - S000002887 [Member] Market Index Performance link:presentationLink link:definitionLink link:calculationLink 810000 - Disclosure - S000002887 [Member] N-1A Cover link:presentationLink link:definitionLink link:calculationLink 810001 - Disclosure - S000002887 [Member] N-1A Supplement link:presentationLink link:definitionLink link:calculationLink 910002 - Disclosure - S000002884 [Member] Investment Objectives and Goals link:presentationLink link:definitionLink link:calculationLink 910003 - Disclosure - S000002884 [Member] Fees and Expenses link:presentationLink link:definitionLink link:calculationLink 910004 - Disclosure - S000002884 [Member] Investment Strategy link:presentationLink link:definitionLink link:calculationLink 910005 - Disclosure - S000002884 [Member] Investment Risks link:presentationLink link:definitionLink link:calculationLink 910006 - Disclosure - S000002884 [Member] Performance Management link:presentationLink link:definitionLink link:calculationLink 920010 - Disclosure - S000002884 [Member] Shareholder Fees link:presentationLink link:definitionLink link:calculationLink 920020 - Disclosure - S000002884 [Member] Annual Fund Operating Expenses link:presentationLink link:definitionLink link:calculationLink 920030 - Disclosure - S000002884 [Member] Expense Example link:presentationLink link:definitionLink link:calculationLink 920040 - Disclosure - S000002884 [Member] Expense Example, No Redemption link:presentationLink link:definitionLink link:calculationLink 920045 - Disclosure - S000002884 [Member] Risks Data link:presentationLink link:definitionLink link:calculationLink 920050 - Disclosure - S000002884 [Member] Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 920060 - Disclosure - S000002884 [Member] Average Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 920070 - Disclosure - S000002884 [Member] Market Index Performance link:presentationLink link:definitionLink link:calculationLink 910000 - Disclosure - S000002884 [Member] N-1A Cover link:presentationLink link:definitionLink link:calculationLink 910001 - Disclosure - S000002884 [Member] N-1A Supplement link:presentationLink link:definitionLink link:calculationLink 1010002 - Disclosure - S000059909 [Member] Investment Objectives and Goals link:presentationLink link:definitionLink link:calculationLink 1010003 - 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Disclosure - S000059909 [Member] Risks Data link:presentationLink link:definitionLink link:calculationLink 1020050 - Disclosure - S000059909 [Member] Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 1020060 - Disclosure - S000059909 [Member] Average Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 1020070 - Disclosure - S000059909 [Member] Market Index Performance link:presentationLink link:definitionLink link:calculationLink 1010000 - Disclosure - S000059909 [Member] N-1A Cover link:presentationLink link:definitionLink link:calculationLink 1010001 - Disclosure - S000059909 [Member] N-1A Supplement link:presentationLink link:definitionLink link:calculationLink 1110002 - Disclosure - S000002881 [Member] Investment Objectives and Goals link:presentationLink link:definitionLink link:calculationLink 1110003 - Disclosure - S000002881 [Member] Fees and Expenses link:presentationLink link:definitionLink link:calculationLink 1110004 - 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Disclosure - S000002881 [Member] Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 1120060 - Disclosure - S000002881 [Member] Average Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 1120070 - Disclosure - S000002881 [Member] Market Index Performance link:presentationLink link:definitionLink link:calculationLink 1110000 - Disclosure - S000002881 [Member] N-1A Cover link:presentationLink link:definitionLink link:calculationLink 1110001 - Disclosure - S000002881 [Member] N-1A Supplement link:presentationLink link:definitionLink link:calculationLink 1210002 - Disclosure - S000002877 [Member] Investment Objectives and Goals link:presentationLink link:definitionLink link:calculationLink 1210003 - Disclosure - S000002877 [Member] Fees and Expenses link:presentationLink link:definitionLink link:calculationLink 1210004 - Disclosure - S000002877 [Member] Investment Strategy link:presentationLink link:definitionLink link:calculationLink 1210005 - Disclosure - S000002877 [Member] Investment Risks link:presentationLink link:definitionLink link:calculationLink 1210006 - Disclosure - S000002877 [Member] Performance Management link:presentationLink link:definitionLink link:calculationLink 1220010 - Disclosure - S000002877 [Member] Shareholder Fees link:presentationLink link:definitionLink link:calculationLink 1220020 - Disclosure - S000002877 [Member] Annual Fund Operating Expenses link:presentationLink link:definitionLink link:calculationLink 1220030 - Disclosure - S000002877 [Member] Expense Example link:presentationLink link:definitionLink link:calculationLink 1220040 - Disclosure - S000002877 [Member] Expense Example, No Redemption link:presentationLink link:definitionLink link:calculationLink 1220045 - Disclosure - S000002877 [Member] Risks Data link:presentationLink link:definitionLink link:calculationLink 1220050 - Disclosure - S000002877 [Member] Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 1220060 - Disclosure - S000002877 [Member] Average Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 1220070 - Disclosure - S000002877 [Member] Market Index Performance link:presentationLink link:definitionLink link:calculationLink 1210000 - Disclosure - S000002877 [Member] N-1A Cover link:presentationLink link:definitionLink link:calculationLink 1210001 - Disclosure - S000002877 [Member] N-1A Supplement link:presentationLink link:definitionLink link:calculationLink 1310002 - Disclosure - S000002874 [Member] Investment Objectives and Goals link:presentationLink link:definitionLink link:calculationLink 1310003 - Disclosure - S000002874 [Member] Fees and Expenses link:presentationLink link:definitionLink link:calculationLink 1310004 - Disclosure - S000002874 [Member] Investment Strategy link:presentationLink link:definitionLink link:calculationLink 1310005 - Disclosure - S000002874 [Member] Investment Risks link:presentationLink link:definitionLink link:calculationLink 1310006 - Disclosure - S000002874 [Member] Performance Management link:presentationLink link:definitionLink link:calculationLink 1320010 - Disclosure - S000002874 [Member] Shareholder Fees link:presentationLink link:definitionLink link:calculationLink 1320020 - Disclosure - S000002874 [Member] Annual Fund Operating Expenses link:presentationLink link:definitionLink link:calculationLink 1320030 - Disclosure - S000002874 [Member] Expense Example link:presentationLink link:definitionLink link:calculationLink 1320040 - Disclosure - S000002874 [Member] Expense Example, No Redemption link:presentationLink link:definitionLink link:calculationLink 1320045 - Disclosure - S000002874 [Member] Risks Data link:presentationLink link:definitionLink link:calculationLink 1320050 - Disclosure - S000002874 [Member] Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 1320060 - Disclosure - S000002874 [Member] Average Annual Total Returns link:presentationLink link:definitionLink link:calculationLink 1320070 - Disclosure - S000002874 [Member] Market Index Performance link:presentationLink link:definitionLink link:calculationLink 1310000 - Disclosure - S000002874 [Member] N-1A Cover link:presentationLink link:definitionLink link:calculationLink 1310001 - Disclosure - S000002874 [Member] N-1A Supplement link:presentationLink link:definitionLink link:calculationLink 1410002 - Disclosure - S000002875 [Member] Investment Objectives and Goals link:presentationLink link:definitionLink link:calculationLink 1410003 - Disclosure - S000002875 [Member] Fees and Expenses link:presentationLink link:definitionLink link:calculationLink 1410004 - Disclosure - S000002875 [Member] Investment Strategy link:presentationLink link:definitionLink link:calculationLink 1410005 - Disclosure - S000002875 [Member] Investment Risks link:presentationLink link:definitionLink link:calculationLink 1410006 - Disclosure - S000002875 [Member] Performance Management link:presentationLink link:definitionLink link:calculationLink 1420010 - 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Disclosure - S000002875 [Member] N-1A Cover link:presentationLink link:definitionLink link:calculationLink 1410001 - Disclosure - S000002875 [Member] N-1A Supplement link:presentationLink link:definitionLink link:calculationLink 1510002 - Disclosure - S000059910 [Member] Investment Objectives and Goals link:presentationLink link:definitionLink link:calculationLink 1510003 - Disclosure - S000059910 [Member] Fees and Expenses link:presentationLink link:definitionLink link:calculationLink 1510004 - Disclosure - S000059910 [Member] Investment Strategy link:presentationLink link:definitionLink link:calculationLink 1510005 - Disclosure - S000059910 [Member] Investment Risks link:presentationLink link:definitionLink link:calculationLink 1510006 - Disclosure - S000059910 [Member] Performance Management link:presentationLink link:definitionLink link:calculationLink 1520010 - Disclosure - S000059910 [Member] Shareholder Fees link:presentationLink link:definitionLink link:calculationLink 1520020 - 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Disclosure - S000059910 [Member] N-1A Supplement link:presentationLink link:definitionLink link:calculationLink BlackRock Advantage Large Cap Core V.I. 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Fund S000002885 [Member] Russell 1000® Growth Index (Reflects no deduction for fees, expenses or taxes) Russell 1000 Growth Index [Member] S&P 500® Index (Reflects no deduction for fees, expenses or taxes) SAndP [Member] C000007932 [Member] C000007933 [Member] C000007934 [Member] Mid Cap Securities Risk [Member] Rights Risk [Member] Sector Risk [Member] BlackRock Equity Dividend V.I. Fund S000002880 [Member] S000002880 S P 500 Index [Member] S000002880 Russell 1000 Value Index [Member] C000007917 [Member] C000007918 [Member] C000007919 [Member] Income Producing Stock Availability Risk [Member] BlackRock Global Allocation V.I. Fund S000002887 [Member] FTSE World Index (Reflects no deduction for fees, expenses or taxes) S000002887 F T S E World Index [Member] Reference Benchmark (Reflects no deduction for fees, expenses or taxes) S000002887 Reference Benchmark [Member] C000007938 [Member] C000007939 [Member] C000007940 [Member] Corporate Loans Risk [Member] Distressed Securities Risk [Member] Emerging Markets Risk [Member] High Yield Bonds Risk [Member] Indexed and Inverse Securities Risk [Member] Mortgage and Asset Backed Securities Risks [Member] Precious Metal and Related Securities Risk [Member] Real Estate Related Securities Risk [Member] R E I T Investment Risk [Member] Risks of Loan Assignments and Participations [Member] Small Cap and Emerging Growth Securities Risk [Member] Sovereign Debt Risk [Member] Structured Notes Risk [Member] Subsidiary Risk [Member] Warrants Risk [Member] BlackRock Government Money Market V.I. Fund S000002884 [Member] C000007929 [Member] C000007930 [Member] C000007931 [Member] Treasury Obligations Risk [Member] U S Government Obligations Risk [Member] Repurchase Agreements Risk [Member] Credit Risks [Member] Income Risk [Member] Stable Net Asset Value Risk [Member] Variable and Floating Rate Instrument Risk [Member] When Issued and Delayed Delivery Securities and Forward Commitments Risk [Member] Interest Rate Risks [Member] BlackRock International Index V.I. Fund S000059909 [Member] MSCI EAFE Index (Net) (Reflects no deduction for fees, expenses or taxes, except for withholding taxes on reinvested dividends) MSCI EAFE Index Net [Member] C000195945 [Member] C000225417 [Member] Index Related Risk [Member] Passive Investment Risk [Member] Tracking Error Risk [Member] Geographic Concentration Risks [Member] Representative Sampling Risk [Member] BlackRock International V.I. Fund S000002881 [Member] MSCI ACWI ex USA Index (Net) (Reflects no deduction for fees, expenses or taxes, except for withholding taxes on reinvested dividends) MSCI ACWI ex USA Index Net [Member] C000007920 [Member] C000007921 [Member] C000007922 [Member] Focus Risk [Member] Supranational Entities Risk [Member] BlackRock Large Cap Focus Growth V.I. Fund S000002877 [Member] S000002877 Russell 1000 Index [Member] S000002877 Russell 1000 Growth Index [Member] C000007908 [Member] C000007909 [Member] C000007910 [Member] Depositary Receipts Risk [Member] BlackRock Managed Volatility V.I. Fund S000002874 [Member] MSCI All Country World Index (50%) (Net)/FTSE WGBI (hedged into USD) (50%) (Reflects no deduction for fees, expenses or taxes, except for withholding taxes on reinvested dividends for net indexes) S000002874 M S C I All Country World Index 50 Net F T S E W G B I Hedged into U S D 50 [Member] ICE BofA 3-Month U.S. Treasury Bill Index (Reflects no deduction for fees, expenses or taxes) S000002874 I C E Bof A 3 Month U S Treasury Bill Index [Member] S000002874 M S C I All Country World Index Net [Member] FTSE WGBI (hedged into USD) (Reflects no deduction for fees, expenses or taxes) S000002874 F T S E W G B I Hedged into U S D [Member] C000007899 [Member] C000007900 [Member] C000007901 [Member] Collateralized Debt Obligations Risk [Member] Dollar Rolls Risk [Member] Inflation Indexed Bonds Risk [Member] Money Market Securities Risk [Member] Municipal Securities Risks [Member] Repurchase Agreements and Purchase and Sale Contracts Risk [Member] Reverse Repurchase Agreements Risk [Member] Structured Securities Risk [Member] U S Government Mortgage Related Securities Risk [Member] Zero Coupon Securities Risk [Member] BlackRock S&P 500 Index V.I. Fund S000002875 [Member] S000002875 S P 500 Index [Member] C000007902 [Member] C000007903 [Member] C000007904 [Member] BlackRock Small Cap Index V.I. Fund S000059910 [Member] S000059910 Russell 3000 Index [Member] Russell 2000 Index (Reflects no deduction for fees, expenses or taxes) S000059910 Russell 2000 Index [Member] C000195946 [Member] C000225418 [Member] Small Cap Securities Risk [Member]