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Shareholder Report
 6 Months Ended
Jun. 30, 2025
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name STATE STREET VARIABLE INSURANCE SERIES FUNDS INC
Entity Central Index Key 0000746687
Entity Investment Company Type N-1A
Document Period End Date Jun. 30, 2025
C000004445  
Shareholder Report [Line Items]  
Fund Name State Street Income V.I.S. Fund
Class Name Class 1
Trading Symbol SSIMX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the State Street Income V.I.S. Fund (the "Fund") for the period of January 1, 2025 through June 30, 2025.
Shareholder Report Annual or Semi-Annual Semi-Annual Shareholder Report
Additional Information [Text Block] You can find additional information about the Fund, including the Prospectus, Statement of Additional Information, financial statements and other information at https://www.ssga.com/us/en/institutional/fund-finder?type=mf. You can also request this information about the Fund by contacting us at 1-800-242-0134.
Additional Information Phone Number 1-800-242-0134
Additional Information Website https://www.ssga.com/us/en/institutional/fund-finder?type=mf
Expenses [Text Block]

What were the Fund costs for the last six months? (based on a hypothetical $10,000 Investment)

Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class 1
$78
1.55%Footnote Reference*
Footnote Description
Footnote*
 Annualized.
Expenses Paid, Amount $ 78
Expense Ratio, Percent 1.55% [1]
AssetsNet $ 8,856,336
Holdings Count | Holding 916
InvestmentCompanyPortfolioTurnover 21.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics as of 6/30/2025

  • Total Net Assets$8,856,336
  • Number of Portfolio Holdings916
  • Portfolio Turnover Rate21%

 
Holdings [Text Block]

Top Security Types

Asset
%
U.S. Treasuries
32.7%
Agency Mortgage Backed
31.3%
Corporate Notes
26.7%
Short-Term Investments
18.9%
Non-Agency Collateralized Mortgage Obligations
6.1%
Agency Collateralized Mortgage Obligations
1.2%
Municipal Bonds and Notes
0.2%

 
Largest Holdings [Text Block]

Top Ten Holdings

Holdings
%
U.S. Treasury Notes, 3.88%, due 08/15/33
9.0%
U.S. Treasury Notes, 4.25%, due 11/15/34
6.4%
Uniform Mortgage-Backed Security, TBA, 2.50%, due 07/01/55
4.9%
Uniform Mortgage-Backed Security, TBA, 6.00%, due 07/01/54
4.8%
Uniform Mortgage-Backed Security, TBA, 6.50%, due 07/01/54
2.9%
U.S. Treasury Inflation-Indexed Notes, 1.88%, due 07/15/34
2.7%
Uniform Mortgage-Backed Security, TBA, 2.00%, due 07/01/54
2.7%
U.S. Treasury Bonds, 4.13%, due 08/15/53
2.6%
U.S. Treasury Bonds, 3.00%, due 08/15/48
2.3%
Federal National Mortgage Association, 2.50%, due 03/01/51
1.9%
C000004449  
Shareholder Report [Line Items]  
Fund Name State Street Premier Growth Equity V.I.S. Fund
Class Name Class 1
Trading Symbol SPGSX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the State Street Premier Growth Equity V.I.S. Fund (the "Fund") for the period of January 1, 2025 through June 30, 2025.
Shareholder Report Annual or Semi-Annual Semi-Annual Shareholder Report
Additional Information [Text Block] You can find additional information about the Fund, including the Prospectus, Statement of Additional Information, financial statements and other information at https://www.ssga.com/us/en/institutional/fund-finder?type=mf. You can also request this information about the Fund by contacting us at 1-800-242-0134.
Additional Information Phone Number 1-800-242-0134
Additional Information Website https://www.ssga.com/us/en/institutional/fund-finder?type=mf
Expenses [Text Block]

What were the Fund costs for the last six months? (based on a hypothetical $10,000 Investment)

Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class 1
$47
0.91%Footnote Reference*
Footnote Description
Footnote*
 Annualized.
Expenses Paid, Amount $ 47
Expense Ratio, Percent 0.91% [2]
AssetsNet $ 33,690,197
Holdings Count | Holding 38
InvestmentCompanyPortfolioTurnover 19.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics as of 6/30/2025

  • Total Net Assets$33,690,197
  • Number of Portfolio Holdings38
  • Portfolio Turnover Rate19%

 
Holdings [Text Block]

Top Ten Industries

Industry
%
Semiconductors & Semiconductor Equipment
22.1%
Software
21.6%
Interactive Media & Services
12.5%
Broadline Retail
6.9%
Exchange Traded & Mutual Funds
4.6%
Technology Hardware, Storage & Peripherals
4.5%
Financial Services
4.3%
Pharmaceuticals
4.1%
Capital Markets
2.5%
Electronic Equipment
2.2%

 
Largest Holdings [Text Block]

Top Ten Holdings

Holdings
%
NVIDIA Corp.
14.4%
Microsoft Corp.
14.3%
Amazon.com, Inc.
6.9%
Meta Platforms, Inc., Class A
6.7%
Broadcom, Inc.
4.9%
Apple, Inc.
4.5%
Eli Lilly & Co.
3.0%
Alphabet, Inc., Class C
3.0%
Alphabet, Inc., Class A
2.9%
Visa, Inc., Class A
2.8%
C000004440  
Shareholder Report [Line Items]  
Fund Name State Street Real Estate Securities V.I.S. Fund
Class Name Class 1
Trading Symbol SSRSX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the State Street Real Estate Securities V.I.S. Fund (the "Fund") for the period of January 1, 2025 through June 30, 2025.
Shareholder Report Annual or Semi-Annual Semi-Annual Shareholder Report
Additional Information [Text Block] You can find additional information about the Fund, including the Prospectus, Statement of Additional Information, financial statements and other information at https://www.ssga.com/us/en/institutional/fund-finder?type=mf. You can also request this information about the Fund by contacting us at 1-800-242-0134.
Additional Information Phone Number 1-800-242-0134
Additional Information Website https://www.ssga.com/us/en/institutional/fund-finder?type=mf
Expenses [Text Block]

What were the Fund costs for the last six months? (based on a hypothetical $10,000 Investment)

Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class 1
$62
1.25%Footnote Reference*
Footnote Description
Footnote*
 Annualized.
Expenses Paid, Amount $ 62
Expense Ratio, Percent 1.25% [3]
AssetsNet $ 19,618,204
Holdings Count | Holding 52
InvestmentCompanyPortfolioTurnover 15.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics as of 6/30/2025

  • Total Net Assets$19,618,204
  • Number of Portfolio Holdings52
  • Portfolio Turnover Rate15%

 
Holdings [Text Block]

Top Industries

Industry
%
Specialized REITs
25.7%
Health Care REITs
20.1%
Retail REITs
18.7%
Residential REITs
14.8%
Industrial REITs
11.3%
Office REITs
4.9%
Hotel & Resort REITs
2.9%
Diversified REITs
0.9%

 
Largest Holdings [Text Block]

Top Ten Holdings

Holdings
%
Welltower, Inc.
7.9%
Equinix, Inc.
7.8%
Prologis, Inc.
7.3%
Digital Realty Trust, Inc.
4.9%
Ventas, Inc.
4.3%
Extra Space Storage, Inc.
4.2%
UDR, Inc.
3.7%
Realty Income Corp.
3.4%
Camden Property Trust
3.1%
Simon Property Group, Inc.
3.1%
C000004450  
Shareholder Report [Line Items]  
Fund Name State Street S&P 500 Index V.I.S. Fund
Class Name Class 1
Trading Symbol SSSPX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the State Street S&P 500 Index V.I.S. Fund (the "Fund") for the period of January 1, 2025 through June 30, 2025.
Shareholder Report Annual or Semi-Annual Semi-Annual Shareholder Report
Additional Information [Text Block] You can find additional information about the Fund, including the Prospectus, Statement of Additional Information, financial statements and other information at https://www.ssga.com/us/en/institutional/fund-finder?type=mf. You can also request this information about the Fund by contacting us at 1-800-242-0134.
Additional Information Phone Number 1-800-242-0134
Additional Information Website https://www.ssga.com/us/en/institutional/fund-finder?type=mf
Expenses [Text Block]

What were the Fund costs for the last six months? (based on a hypothetical $10,000 Investment)

Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class 1
$16
0.32%Footnote Reference*
Footnote Description
Footnote*
 Annualized.
Expenses Paid, Amount $ 16
Expense Ratio, Percent 0.32% [4]
AssetsNet $ 197,443,411
Holdings Count | Holding 506
InvestmentCompanyPortfolioTurnover 0.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics as of 6/30/2025

  • Total Net Assets$197,443,411
  • Number of Portfolio Holdings506
  • Portfolio Turnover Rate0%

 
Holdings [Text Block]

Top Ten Industries

Industry
%
Semiconductors
12.6%
Software
11.4%
Interactive Media & Services
6.5%
Technology Hardware, Storage & Peripherals
6.2%
Financial Services
4.3%
Broadline Retail
4.0%
Banks
3.6%
Capital Markets
3.4%
Pharmaceuticals
2.8%
Oil, Gas & Consumable Fuels
2.7%

 
Largest Holdings [Text Block]

Top Ten Holdings

Holdings
%
NVIDIA Corp.
7.3%
Microsoft Corp.
7.0%
Apple, Inc.
5.8%
Amazon.com, Inc.
3.9%
Meta Platforms, Inc., Class A
3.0%
Broadcom, Inc.
2.4%
Alphabet, Inc., Class A
1.9%
Berkshire Hathaway, Inc., Class B
1.7%
Tesla, Inc.
1.7%
Alphabet, Inc., Class C
1.6%
C000004438  
Shareholder Report [Line Items]  
Fund Name State Street Small-Cap Equity V.I.S. Fund
Class Name Class 1
Trading Symbol SSSEX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the State Street Small-Cap Equity V.I.S. Fund (the "Fund") for the period of January 1, 2025 through June 30, 2025.
Shareholder Report Annual or Semi-Annual Semi-Annual Shareholder Report
Additional Information [Text Block] You can find additional information about the Fund, including the Prospectus, Statement of Additional Information, financial statements and other information at https://www.ssga.com/us/en/institutional/fund-finder?type=mf . You can also request this information about the Fund by contacting us at 1-800-242-0134.
Additional Information Phone Number 1-800-242-0134
Additional Information Website https://www.ssga.com/us/en/institutional/fund-finder?type=mf 
Expenses [Text Block]

What were the Fund costs for the last six months? (based on a hypothetical $10,000 Investment)

Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class 1
$68
1.39%Footnote Reference*
Footnote Description
Footnote*
 Annualized.
Expenses Paid, Amount $ 68
Expense Ratio, Percent 1.39% [5]
AssetsNet $ 22,848,347
Holdings Count | Holding 330
InvestmentCompanyPortfolioTurnover 20.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics as of 6/30/2025

  • Total Net Assets$22,848,347
  • Number of Portfolio Holdings330
  • Portfolio Turnover Rate20%

 
Holdings [Text Block]

Top Ten Industries

Industry
%
Banks
9.7%
Machinery
8.4%
Software
7.8%
Electronic Equipment, Instruments & Components
4.4%
Healthcare Equipment & Supplies
4.2%
Commercial Services & Supplies
4.2%
Specialty Retail
3.3%
Insurance
3.3%
Chemicals
3.1%
Hotels, Restaurants & Leisure
3.0%

 
Largest Holdings [Text Block]

Top Ten Holdings

Holdings
%
MSA Safety, Inc.
1.5%
Darling Ingredients, Inc.
1.2%
Modine Manufacturing Co.
1.2%
Brink's Co.
1.1%
Enerpac Tool Group Corp.
1.1%
Belden, Inc.
1.1%
Boot Barn Holdings, Inc.
1.0%
U.S. Physical Therapy, Inc.
1.0%
Repligen Corp.
0.9%
Applied Industrial Technologies, Inc.
0.9%
C000004439  
Shareholder Report [Line Items]  
Fund Name State Street Total Return V.I.S. Fund
Class Name Class 1
Trading Symbol SSTIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the State Street Total Return V.I.S. Fund (the "Fund") for the period of January 1, 2025 through June 30, 2025.
Shareholder Report Annual or Semi-Annual Semi-Annual Shareholder Report
Additional Information [Text Block] You can find additional information about the Fund, including the Prospectus, Statement of Additional Information, financial statements and other information at https://www.ssga.com/us/en/institutional/fund-finder?type=mf. You can also request this information about the Fund by contacting us at 1-800-242-0134.
Additional Information Phone Number 1-800-242-0134
Additional Information Website https://www.ssga.com/us/en/institutional/fund-finder?type=mf
Expenses [Text Block]

What were the Fund costs for the last six months? (based on a hypothetical $10,000 Investment)

Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class 1
$31
0.61%Footnote Reference*
Footnote Description
Footnote*
 Annualized.
Expenses Paid, Amount $ 31
Expense Ratio, Percent 0.61% [6]
AssetsNet $ 1,056,439,882
Holdings Count | Holding 4,849
InvestmentCompanyPortfolioTurnover 65.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics as of 6/30/2025

  • Total Net Assets$1,056,439,882
  • Number of Portfolio Holdings4,849
  • Portfolio Turnover Rate65%

 
Holdings [Text Block]

Top Security Types

Asset
%
Common Stocks
54.5%
Mutual Funds and Exchange Traded Products
41.8%
Short-Term Investments
3.5%
Preferred Stock
0.1%

 
Largest Holdings [Text Block]

Top Ten Holdings

Holdings
%
SPDR Portfolio Aggregate Bond ETF
21.1%
SPDR Bloomberg High Yield Bond ETF
6.0%
SPDR Portfolio TIPS ETF
5.0%
SPDR Portfolio Long Term Corporate Bond ETF
3.6%
NVIDIA Corp.
2.0%
Microsoft Corp.
2.0%
SPDR Dow Jones REIT ETF
1.9%
Apple, Inc.
1.7%
SPDR Portfolio Intermediate Term Corporate Bond ETF
1.5%
Amazon.com, Inc.
1.2%
C000033161  
Shareholder Report [Line Items]  
Fund Name State Street Total Return V.I.S. Fund
Class Name Class 3
Trading Symbol SSTTX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the State Street Total Return V.I.S. Fund (the "Fund") for the period of January 1, 2025 through June 30, 2025.
Shareholder Report Annual or Semi-Annual Semi-Annual Shareholder Report
Additional Information [Text Block] You can find additional information about the Fund, including the Prospectus, Statement of Additional Information, financial statements and other information at https://www.ssga.com/us/en/institutional/fund-finder?type=mf. You can also request this information about the Fund by contacting us at 1-800-242-0134.
Additional Information Phone Number 1-800-242-0134
Additional Information Website https://www.ssga.com/us/en/institutional/fund-finder?type=mf
Expenses [Text Block]

What were the Fund costs for the last six months? (based on a hypothetical $10,000 Investment)

Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class 3
$44
0.86%Footnote Reference*
Footnote Description
Footnote*
 Annualized.
Expenses Paid, Amount $ 44
Expense Ratio, Percent 0.86% [7]
AssetsNet $ 1,056,439,882
Holdings Count | Holding 4,849
InvestmentCompanyPortfolioTurnover 65.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics as of 6/30/2025

  • Total Net Assets$1,056,439,882
  • Number of Portfolio Holdings4,849
  • Portfolio Turnover Rate65%

 
Holdings [Text Block]

Top Security Types

Asset
%
Common Stocks
54.5%
Mutual Funds and Exchange Traded Products
41.8%
Short-Term Investments
3.5%
Preferred Stock
0.1%

 
Largest Holdings [Text Block]

Top Ten Holdings

Holdings
%
SPDR Portfolio Aggregate Bond ETF
21.1%
SPDR Bloomberg High Yield Bond ETF
6.0%
SPDR Portfolio TIPS ETF
5.0%
SPDR Portfolio Long Term Corporate Bond ETF
3.6%
NVIDIA Corp.
2.0%
Microsoft Corp.
2.0%
SPDR Dow Jones REIT ETF
1.9%
Apple, Inc.
1.7%
SPDR Portfolio Intermediate Term Corporate Bond ETF
1.5%
Amazon.com, Inc.
1.2%
C000004441  
Shareholder Report [Line Items]  
Fund Name State Street U.S. Equity V.I.S. Fund
Class Name Class 1
Trading Symbol SSUSX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the State Street U.S. Equity V.I.S. Fund (the "Fund") for the period of January 1, 2025 through June 30, 2025.
Shareholder Report Annual or Semi-Annual Semi-Annual Shareholder Report
Additional Information [Text Block] You can find additional information about the Fund, including the Prospectus, Statement of Additional Information, financial statements and other information at https://www.ssga.com/us/en/institutional/fund-finder?type=mf. You can also request this information about the Fund by contacting us at 1-800-242-0134.
Additional Information Phone Number 1-800-242-0134
Additional Information Website https://www.ssga.com/us/en/institutional/fund-finder?type=mf
Expenses [Text Block]

What were the Fund costs for the last six months? (based on a hypothetical $10,000 Investment)

Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Class 1
$49
0.96%Footnote Reference*
Footnote Description
Footnote*
 Annualized.
Expenses Paid, Amount $ 49
Expense Ratio, Percent 0.96% [8]
AssetsNet $ 20,148,669
Holdings Count | Holding 96
InvestmentCompanyPortfolioTurnover 22.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics as of 6/30/2025

  • Total Net Assets$20,148,669
  • Number of Portfolio Holdings96
  • Portfolio Turnover Rate22%

 
Holdings [Text Block]

Top Ten Industries

Industry
%
Semiconductors & Semiconductor Equipments
14.3%
Software
12.9%
Interactive Media & Services
8.4%
Technology Hardware, Storage & Peripherals
4.9%
Broadline Retail
4.6%
Capital Markets
4.2%
Banks
3.8%
Financial Services
3.5%
Pharmaceuticals
3.4%
Specialty Retail
2.6%

 
Largest Holdings [Text Block]

Top Ten Holdings

Holdings
%
NVIDIA Corp.
8.4%
Microsoft Corp.
8.0%
Apple, Inc.
4.9%
Amazon.com, Inc.
4.6%
Meta Platforms, Inc., Class A
4.0%
Alphabet, Inc., Class A
3.9%
Broadcom, Inc.
3.1%
JPMorgan Chase & Co.
2.1%
Visa, Inc., Class A
1.8%
Bank of America Corp.
1.7%
[1] Annualized.
[2] Annualized.
[3] Annualized.
[4] Annualized.
[5] Annualized.
[6] Annualized.
[7] Annualized.
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