State Street Variable Insurance Series Funds N-CSR 28 Feb 25 Certified annual shareholder report (management investment company) Financial data

Form N-CSR Cover

Form N-CSR Cover	12 Months Ended
	Dec. 31, 2024
Shareholder Report [Line Items]
Document Type	N-CSR
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	Dec. 31, 2024

Shareholder Report

Shareholder Report	12 Months Ended
	Dec. 31, 2024 USD ($) Holding
Shareholder Report [Line Items]
Document Type	N-CSR
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	Dec. 31, 2024
C000004445
Shareholder Report [Line Items]
Fund Name	State Street Income V.I.S. Fund
Trading Symbol	SSIMX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about the State Street Income V.I.S. Fund (the "Fund") for the period of January 1, 2024 to December 31, 2024.
Shareholder Report Annual or Semi-Annual	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 www.ssga.com/us/en/individual/fund-finder?tab=documents&type=mf
Additional Information Phone Number	1-800-242-0134
Additional Information Website	www.ssga.com/us/en/individual/fund-finder?tab=documents&type=mf</span>" id="sjs-B18">&lt;span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 14.4px; margin: 0px; overflow: visible; text-align: left;">www.ssga.com/us/en/individual/fund-finder?tab=documents&amp;type=mf&lt;/span>
Expenses [Text Block]	What were the Fund costs for the last year (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 $136 1.37%
Expenses Paid, Amount	$ 136
Expense Ratio, Percent	1.37%
Factors Affecting Performance [Text Block]	How did the Fund perform last year and what affected its performance? Duration allocation had a negative impact on performance and was the primary driver of Fund performance relative to the Index during the reporting period, while security selection had a positive impact. Our view in the fourth quarter of 2023 was that the economy, inflation and interest rates had peaked and were likely to decline over the reporting period. This outlook had the Fund begin the reporting period with a significant over-weight allocation to duration and a modest over-weight to credit sectors. The Fed cut the Fed Funds rate by 100bps, but the yield on the 10-year U.S. Treasury note increased from 3.88% to 4.57%, due to the positive expected economic impact from the Republican 2024 electoral sweep, during the reporting period. The Fund’s duration over-weight position contributed negatively to its performance relative to its Benchmark. Security selection in the investment grade corporate and CMBS allocations generated positive excess returns, while agency MBS detracted from performance. The Fund used treasury futures and index credit default swaps in order to actively manage duration and credit spread duration during the reporting period, with each product negatively contributing to Fund performance relative to the Index.
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future. The returns do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or on the redemption or sale of Fund shares.
Line Graph [Table Text Block]	SSIMX Bloomberg US Aggregate Bond Index 12/31/14 $10,000 $10,000 01/31/15 $10,190 $10,210 02/28/15 $10,130 $10,114 03/31/15 $10,164 $10,161 04/30/15 $10,130 $10,124 05/31/15 $10,087 $10,100 06/30/15 $9,965 $9,990 07/31/15 $10,017 $10,059 08/31/15 $9,991 $10,045 09/30/15 $10,000 $10,113 10/31/15 $10,061 $10,114 11/30/15 $10,017 $10,088 12/31/15 $9,958 $10,055 01/31/16 $10,002 $10,193 02/29/16 $10,046 $10,266 03/31/16 $10,214 $10,360 04/30/16 $10,294 $10,400 05/31/16 $10,276 $10,402 06/30/16 $10,453 $10,589 07/31/16 $10,560 $10,656 08/31/16 $10,568 $10,644 09/30/16 $10,542 $10,638 10/31/16 $10,471 $10,556 11/30/16 $10,232 $10,307 12/31/16 $10,255 $10,321 01/31/17 $10,282 $10,341 02/28/17 $10,354 $10,411 03/31/17 $10,381 $10,405 04/30/17 $10,471 $10,486 05/31/17 $10,534 $10,566 06/30/17 $10,516 $10,556 07/31/17 $10,552 $10,601 08/31/17 $10,625 $10,696 09/30/17 $10,580 $10,645 10/31/17 $10,580 $10,652 11/30/17 $10,552 $10,638 12/31/17 $10,588 $10,687 01/31/18 $10,486 $10,564 02/28/18 $10,357 $10,464 03/31/18 $10,403 $10,531 04/30/18 $10,302 $10,452 05/31/18 $10,357 $10,527 06/30/18 $10,320 $10,514 07/31/18 $10,330 $10,516 08/31/18 $10,394 $10,584 09/30/18 $10,339 $10,516 10/31/18 $10,247 $10,433 11/30/18 $10,284 $10,495 12/31/18 $10,437 $10,688 01/31/19 $10,588 $10,801 02/28/19 $10,578 $10,795 03/31/19 $10,776 $11,002 04/30/19 $10,795 $11,005 05/31/19 $10,946 $11,201 06/30/19 $11,097 $11,341 07/31/19 $11,116 $11,366 08/31/19 $11,361 $11,661 09/30/19 $11,295 $11,599 10/31/19 $11,323 $11,634 11/30/19 $11,333 $11,628 12/31/19 $11,337 $11,620 01/31/20 $11,488 $11,843 02/29/20 $11,592 $12,056 03/31/20 $11,346 $11,985 04/30/20 $11,611 $12,198 05/31/20 $11,771 $12,255 06/30/20 $11,866 $12,332 07/31/20 $12,073 $12,517 08/31/20 $11,979 $12,416 09/30/20 $11,951 $12,409 10/31/20 $11,913 $12,353 11/30/20 $12,092 $12,475 12/31/20 $12,133 $12,492 01/31/21 $12,046 $12,402 02/28/21 $11,890 $12,223 03/31/21 $11,744 $12,071 04/30/21 $11,832 $12,166 05/31/21 $11,880 $12,206 06/30/21 $11,968 $12,291 07/31/21 $12,094 $12,429 08/31/21 $12,065 $12,405 09/30/21 $11,958 $12,298 10/31/21 $11,939 $12,294 11/30/21 $11,948 $12,331 12/31/21 $11,913 $12,299 01/31/22 $11,622 $12,034 02/28/22 $11,451 $11,900 03/31/22 $11,130 $11,569 04/30/22 $10,698 $11,130 05/31/22 $10,738 $11,202 06/30/22 $10,537 $11,026 07/31/22 $10,788 $11,296 08/31/22 $10,477 $10,977 09/30/22 $10,005 $10,502 10/31/22 $9,894 $10,366 11/30/22 $10,276 $10,748 12/31/22 $10,200 $10,699 01/31/23 $10,556 $11,028 02/28/23 $10,242 $10,743 03/31/23 $10,514 $11,016 04/30/23 $10,577 $11,083 05/31/23 $10,420 $10,962 06/30/23 $10,368 $10,923 07/31/23 $10,357 $10,915 08/31/23 $10,273 $10,846 09/30/23 $9,948 $10,570 10/31/23 $9,739 $10,403 11/30/23 $10,242 $10,874 12/31/23 $10,678 $11,291 01/31/24 $10,646 $11,260 02/29/24 $10,442 $11,100 03/31/24 $10,528 $11,203 04/30/24 $10,186 $10,920 05/31/24 $10,367 $11,105 06/30/24 $10,485 $11,210 07/31/24 $10,731 $11,472 08/31/24 $10,902 $11,637 09/30/24 $11,041 $11,793 10/31/24 $10,688 $11,500 11/30/24 $10,795 $11,622 12/31/24 $10,591 $11,432
Average Annual Return [Table Text Block]	Name 1 Year 5 Years 10 Years SSIMX (0.82%) (1.35%) 0.58% Bloomberg US Aggregate Bond Index 1.25% (0.33%) 1.35%
Updated Performance Information Location [Text Block]	Updated performance information is available by calling 1-800-242-0134 www.ssga.com
AssetsNet	$ 8,916,380
Holdings Count | Holding	979
Advisory Fees Paid, Amount	$ 47,303
InvestmentCompanyPortfolioTurnover	52%
Additional Fund Statistics [Text Block]	Key Fund Statistics as of 12/31/2024 Total Net Assets $8,916,380 Number of Portfolio Holdings 979 Portfolio Turnover Rate 52% Total Advisory Fees Paid $47,303
Holdings [Text Block]	Top Ten Holdings Holdings % U.S. Treasury Notes, 3.88%, due 08/15/33 8.9% U.S. Treasury Notes, 2.75%, due 08/15/32 5.4% Uniform Mortgage-Backed Security, TBA, 2.50%, due 01/01/55 4.7% Uniform Mortgage-Backed Security, TBA, 6.00%, due 01/01/55 4.7% Uniform Mortgage-Backed Security, TBA, 6.50%, due 01/01/55 2.9% U.S. Treasury Notes, 3.88%, due 08/15/34 2.7% Uniform Mortgage-Backed Security, TBA, 2.00%, due 01/01/55 2.6% U.S. Treasury Inflation-Indexed Notes, 1.88%, due 07/15/34 2.6% U.S. Treasury Bonds, 3.00%, due 08/15/48 2.2% Federal National Mortgage Association, 2.50%, due 03/01/51 1.9% Top Security Type Asset % U.S. Treasuries 31.8% Agency Mortgage Backed 31.3% Corporate Notes 27.2% Short-Term Investments 19.9% Non-Agency Collateralized Mortgage Obligations 6.2% Agency Collateralized Mortgage Obligations 1.2% Sovereign Bonds 0.4% Municipal Bonds and Notes 0.2%
C000004449
Shareholder Report [Line Items]
Fund Name	State Street Premier Growth Equity V.I.S. Fund
Trading Symbol	SPGSX
Annual or Semi-Annual Statement [Text Block]	This 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, 2024 to December 31, 2024.
Shareholder Report Annual or Semi-Annual	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 www.ssga.com/us/en/individual/fund-finder?tab=documents&type=mf
Additional Information Phone Number	1-800-242-0134
Additional Information Website	www.ssga.com/us/en/individual/fund-finder?tab=documents&type=mf</span>" id="sjs-B41">&lt;span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 14.4px; margin: 0px; overflow: visible; text-align: left;">www.ssga.com/us/en/individual/fund-finder?tab=documents&amp;type=mf&lt;/span>
Expenses [Text Block]	What were the Fund costs for the last year (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 $99 0.86%
Expenses Paid, Amount	$ 99
Expense Ratio, Percent	0.86%
Factors Affecting Performance [Text Block]	How did the Fund perform last year and what affected its performance? Primary drivers of performance relative to the Russell 1000 Growth Index included the following: Outperformance and Overweight in IT. IT was one of the best performing Index sectors during the reporting period rising 40.6%. On top of this strong return, the Fund outperformed by 3.6%, adding value through overweight positions in companies that are beneficiaries of Artificial Intelligence investment such as Nvidia and Broadcom. Additionally, the Fund was overweight the sector, adding additional value. Outperformance in Industrials. The Fund benefitted from holdings including Eaton and Parker-Hannifin, which significantly outperformed during the reporting period , as they benefitted from a range of tailwinds including infrastructure/capex spending driven by reshoring, green investment, and increased data center demand. Additionally, the Fund did not own Uber, which underperformed. Underperformance in Healthcare. The Healthcare sector, which is defensive, underperformed in the strong risk-on market. This impacted Fund positions including Thermo Fisher Scientific (life sciences tools & services), Astrazeneca (pharma), and Unitedhealth Group (services).
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future. The returns do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or on the redemption or sale of Fund shares.
Line Graph [Table Text Block]	SPGSX S&P 500 ® Russell 1000 ® 12/31/14 $10,000 $10,000 $10,000 01/31/15 $9,709 $9,700 $9,847 02/28/15 $10,375 $10,257 $10,503 03/31/15 $10,224 $10,095 $10,384 04/30/15 $10,260 $10,192 $10,436 05/31/15 $10,418 $10,323 $10,583 06/30/15 $10,290 $10,123 $10,396 07/31/15 $10,683 $10,335 $10,749 08/31/15 $9,897 $9,712 $10,096 09/30/15 $9,406 $9,471 $9,846 10/31/15 $10,474 $10,270 $10,694 11/30/15 $10,597 $10,301 $10,724 12/31/15 $10,330 $10,138 $10,567 01/31/16 $9,484 $9,635 $9,977 02/29/16 $9,463 $9,622 $9,973 03/31/16 $9,976 $10,275 $10,645 04/30/16 $9,933 $10,315 $10,548 05/31/16 $10,205 $10,500 $10,753 06/30/16 $10,007 $10,527 $10,711 07/31/16 $10,627 $10,915 $11,216 08/31/16 $10,659 $10,931 $11,160 09/30/16 $10,790 $10,933 $11,201 10/31/16 $10,509 $10,733 $10,938 11/30/16 $10,491 $11,131 $11,176 12/31/16 $10,585 $11,351 $11,314 01/31/17 $11,206 $11,566 $11,696 02/28/17 $11,678 $12,025 $12,182 03/31/17 $11,797 $12,039 $12,322 04/30/17 $12,017 $12,163 $12,604 05/31/17 $12,148 $12,334 $12,932 06/30/17 $12,332 $12,411 $12,898 07/31/17 $12,843 $12,666 $13,241 08/31/17 $13,006 $12,705 $13,483 09/30/17 $13,032 $12,967 $13,659 10/31/17 $13,239 $13,270 $14,188 11/30/17 $13,506 $13,677 $14,619 12/31/17 $13,585 $13,829 $14,733 01/31/18 $14,495 $14,621 $15,776 02/28/18 $14,088 $14,082 $15,363 03/31/18 $13,743 $13,724 $14,941 04/30/18 $13,667 $13,777 $14,994 05/31/18 $14,176 $14,108 $15,651 06/30/18 $14,354 $14,195 $15,801 07/31/18 $14,822 $14,724 $16,265 08/31/18 $15,329 $15,203 $17,155 09/30/18 $15,520 $15,290 $17,251 10/31/18 $14,259 $14,245 $15,708 11/30/18 $14,503 $14,535 $15,875 12/31/18 $13,223 $13,223 $14,510 01/31/19 $14,529 $14,282 $15,814 02/28/19 $14,933 $14,741 $16,380 03/31/19 $15,172 $15,027 $16,846 04/30/19 $15,941 $15,636 $17,607 05/31/19 $14,914 $14,642 $16,495 06/30/19 $16,068 $15,674 $17,628 07/31/19 $16,273 $15,899 $18,026 08/31/19 $16,010 $15,648 $17,888 09/30/19 $16,002 $15,940 $17,890 10/31/19 $16,731 $16,286 $18,394 11/30/19 $17,613 $16,877 $19,210 12/31/19 $18,159 $17,386 $19,790 01/31/20 $18,507 $17,379 $20,232 02/29/20 $17,414 $15,949 $18,854 03/31/20 $15,699 $13,979 $17,000 04/30/20 $17,907 $15,771 $19,515 05/31/20 $19,120 $16,522 $20,825 06/30/20 $19,817 $16,850 $21,732 07/31/20 $21,133 $17,801 $23,404 08/31/20 $23,267 $19,080 $25,819 09/30/20 $22,114 $18,355 $24,604 10/31/20 $21,426 $17,867 $23,769 11/30/20 $23,451 $19,823 $26,203 12/31/20 $24,263 $20,585 $27,408 01/31/21 $23,914 $20,377 $27,205 02/28/21 $24,380 $20,939 $27,199 03/31/21 $25,114 $21,856 $27,666 04/30/21 $26,910 $23,022 $29,548 05/31/21 $26,708 $23,183 $29,140 06/30/21 $27,922 $23,724 $30,968 07/31/21 $28,682 $24,288 $31,988 08/31/21 $29,469 $25,026 $33,184 09/30/21 $27,709 $23,863 $31,326 10/31/21 $29,623 $25,534 $34,039 11/30/21 $29,579 $25,357 $34,247 12/31/21 $30,322 $26,494 $34,971 01/31/22 $28,647 $25,123 $31,970 02/28/22 $27,071 $24,371 $30,612 03/31/22 $27,576 $25,276 $31,809 04/30/22 $24,323 $23,071 $27,968 05/31/22 $23,832 $23,114 $27,318 06/30/22 $21,856 $21,206 $25,154 07/31/22 $24,449 $23,161 $28,173 08/31/22 $23,009 $22,217 $26,861 09/30/22 $20,543 $20,170 $24,249 10/31/22 $21,596 $21,804 $25,667 11/30/22 $22,801 $23,022 $26,836 12/31/22 $21,094 $21,696 $24,782 01/31/23 $23,399 $23,059 $26,847 02/28/23 $22,772 $22,496 $26,528 03/31/23 $24,062 $23,322 $28,342 04/30/23 $24,407 $23,686 $28,621 05/31/23 $25,828 $23,789 $29,926 06/30/23 $27,558 $25,361 $31,972 07/31/23 $28,505 $26,176 $33,050 08/31/23 $28,278 $25,759 $32,753 09/30/23 $26,715 $24,531 $30,972 10/31/23 $26,526 $24,015 $30,531 11/30/23 $29,453 $26,208 $33,859 12/31/23 $30,856 $27,399 $35,358 01/31/24 $31,833 $27,859 $36,240 02/29/24 $34,178 $29,347 $38,713 03/31/24 $34,836 $30,291 $39,394 04/30/24 $33,327 $29,054 $37,723 05/31/24 $35,345 $30,494 $39,981 06/30/24 $37,710 $31,589 $42,677 07/31/24 $37,399 $31,973 $41,951 08/31/24 $37,677 $32,749 $42,825 09/30/24 $38,569 $33,448 $44,038 10/31/24 $38,418 $33,145 $43,893 11/30/24 $40,198 $35,090 $46,740 12/31/24 $40,438 $34,254 $47,152
Average Annual Return [Table Text Block]	Name 1 Year 5 Years 10 Years SPGSX 31.06% 17.37% 15.00% S&P 500 ® 25.02% 14.53% 13.10% Russell 1000 ® 33.36% 18.96% 16.78%
Updated Performance Information Location [Text Block]	Updated performance information is available by calling 1-800-242-0134 www.ssga.com
AssetsNet	$ 34,525,116
Holdings Count | Holding	36
Advisory Fees Paid, Amount	$ 224,815
InvestmentCompanyPortfolioTurnover	28%
Additional Fund Statistics [Text Block]	Key Fund Statistics as of 12/31/2024 Total Net Assets $34,525,116 Number of Portfolio Holdings 36 Portfolio Turnover Rate 28% Total Advisory Fees Paid $224,815
Holdings [Text Block]	Top Ten Holdings Holdings % NVIDIA Corp. 12.6% Microsoft Corp. 12.2% Amazon.com, Inc. 8.4% Meta Platforms, Inc., Class A 6.0% Apple, Inc. 4.8% Broadcom, Inc. 4.7% Alphabet, Inc., Class C 4.5% Alphabet, Inc., Class A 4.1% The Technology Select Sector SPDR Fund 3.9% Visa, Inc., Class A 2.8% Top Ten Industry Industry % Semiconductors & Semiconductor Equipment 20.4% Software 19.9% Interactive Media & Services 14.6% Broadline Retail 8.4% Financial Services 5.2% Technology Hardware, Storage & Peripherals 4.8% Specialty Retail 4.5% Exchange Traded & Mutual Funds 3.9% Machinery 1.5% Trading Companies & Distributors 1.5%
C000004440
Shareholder Report [Line Items]
Fund Name	State Street Real Estate Securities V.I.S. Fund
Trading Symbol	SSRSX
Annual or Semi-Annual Statement [Text Block]	This 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, 2024 to December 31, 2024.
Shareholder Report Annual or Semi-Annual	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 www.ssga.com/us/en/individual/fund-finder?tab=documents&type=mf
Additional Information Phone Number	1-800-242-0134
Additional Information Website	www.ssga.com/us/en/individual/fund-finder?tab=documents&type=mf</span>" id="sjs-B64">&lt;span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 14.4px; margin: 0px; overflow: visible; text-align: left;">www.ssga.com/us/en/individual/fund-finder?tab=documents&amp;type=mf&lt;/span>
Expenses [Text Block]	What were the Fund costs for the last year (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 $106 1.01%
Expenses Paid, Amount	$ 106
Expense Ratio, Percent	1.01%
Factors Affecting Performance [Text Block]	How did the Fund perform last year and what affected its performance? The portfolio generated outperformance relative to the benchmark from both stock selection and sector allocation. Positioning within the Health Care and Shopping Center sectors was the primary driver of alpha. Outperformance in Health Care came from overweight positions in Seniors’ Housing and underweights to Life Sciences and Medical Office properties. Shopping Centers saw strong capital markets activity in Q4 which directly benefited the portfolio’s positions and raised valuations across the sector. Positioning within the Net Lease, Hotel, and Office sectors also contributed to stock selection. Overweight allocations in the strongest-performing sectors like Data Centers, Health Care, Office, and Shopping Centers also added to strong absolute and relative performance. The underweight allocation to Industrial, which faced the stiffest challenge during the year, contributed to relative performance. Underweights in two sectors that outperformed, Regional Malls and Specialty, partially detracted from relative performance. Both sectors gained on optimism for strong economic growth. The impact of fees and expenses also detracted; however, the net performance of the Fund outperformed the Index by more than 170 basis points in 2024.
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future. The returns do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or on the redemption or sale of Fund shares.
Line Graph [Table Text Block]	SSRSX S&P 500 ® FTSE NAREIT Equity REITs Index 12/31/14 $10,000 $10,000 $10,000 01/31/15 $10,651 $9,700 $10,671 02/28/15 $10,312 $10,257 $10,299 03/31/15 $10,488 $10,095 $10,475 04/30/15 $9,905 $10,192 $9,900 05/31/15 $9,871 $10,323 $9,888 06/30/15 $9,450 $10,123 $9,433 07/31/15 $10,020 $10,335 $9,965 08/31/15 $9,410 $9,712 $9,348 09/30/15 $9,729 $9,471 $9,621 10/31/15 $10,285 $10,270 $10,186 11/30/15 $10,244 $10,301 $10,133 12/31/15 $10,456 $10,138 $10,320 01/31/16 $10,095 $9,635 $9,974 02/29/16 $10,063 $9,622 $9,932 03/31/16 $11,077 $10,275 $10,939 04/30/16 $10,794 $10,315 $10,678 05/31/16 $11,070 $10,500 $10,937 06/30/16 $11,871 $10,527 $11,700 07/31/16 $12,367 $10,915 $12,186 08/31/16 $11,934 $10,931 $11,739 09/30/16 $11,691 $10,933 $11,532 10/31/16 $11,007 $10,733 $10,880 11/30/16 $10,818 $11,131 $10,697 12/31/16 $11,293 $11,351 $11,199 01/31/17 $11,256 $11,566 $11,212 02/28/17 $11,649 $12,025 $11,594 03/31/17 $11,384 $12,039 $11,329 04/30/17 $11,338 $12,163 $11,343 05/31/17 $11,265 $12,334 $11,255 06/30/17 $11,484 $12,411 $11,501 07/31/17 $11,649 $12,666 $11,642 08/31/17 $11,667 $12,705 $11,612 09/30/17 $11,603 $12,967 $11,609 10/31/17 $11,576 $13,270 $11,497 11/30/17 $11,913 $13,677 $11,809 12/31/17 $11,952 $13,829 $11,784 01/31/18 $11,467 $14,621 $11,292 02/28/18 $10,594 $14,082 $10,421 03/31/18 $11,030 $13,724 $10,818 04/30/18 $11,186 $13,777 $10,973 05/31/18 $11,525 $14,108 $11,406 06/30/18 $12,039 $14,195 $11,904 07/31/18 $12,098 $14,724 $11,999 08/31/18 $12,476 $15,203 $12,364 09/30/18 $12,166 $15,290 $12,050 10/31/18 $11,739 $14,245 $11,693 11/30/18 $12,263 $14,535 $12,247 12/31/18 $11,270 $13,223 $11,239 01/31/19 $12,575 $14,282 $12,560 02/28/19 $12,655 $14,741 $12,651 03/31/19 $13,101 $15,027 $13,075 04/30/19 $13,101 $15,636 $13,044 05/31/19 $13,141 $14,642 $13,073 06/30/19 $13,323 $15,674 $13,238 07/31/19 $13,475 $15,899 $13,407 08/31/19 $14,001 $15,648 $13,863 09/30/19 $14,375 $15,940 $14,269 10/31/19 $14,588 $16,286 $14,464 11/30/19 $14,315 $16,877 $14,246 12/31/19 $14,217 $17,386 $14,161 01/31/20 $14,382 $17,379 $14,332 02/29/20 $13,292 $15,949 $13,185 03/31/20 $10,673 $13,979 $10,295 04/30/20 $11,488 $15,771 $11,149 05/31/20 $11,587 $16,522 $11,171 06/30/20 $11,928 $16,850 $11,512 07/31/20 $12,412 $17,801 $11,978 08/31/20 $12,456 $19,080 $12,072 09/30/20 $12,060 $18,355 $11,677 10/31/20 $11,730 $17,867 $11,372 11/30/20 $13,050 $19,823 $12,614 12/31/20 $13,473 $20,585 $13,028 01/31/21 $13,394 $20,377 $13,042 02/28/21 $13,899 $20,939 $13,565 03/31/21 $14,594 $21,856 $14,184 04/30/21 $15,759 $23,022 $15,327 05/31/21 $15,927 $23,183 $15,484 06/30/21 $16,376 $23,724 $15,889 07/31/21 $17,228 $24,288 $16,653 08/31/21 $17,474 $25,026 $16,959 09/30/21 $16,555 $23,863 $16,044 10/31/21 $17,766 $25,534 $17,263 11/30/21 $17,508 $25,357 $17,147 12/31/21 $19,105 $26,494 $18,661 01/31/22 $17,840 $25,123 $17,383 02/28/22 $17,276 $24,371 $16,839 03/31/22 $18,404 $25,276 $17,942 04/30/22 $17,633 $23,071 $17,154 05/31/22 $16,533 $23,114 $16,084 06/30/22 $15,378 $21,206 $14,892 07/31/22 $16,753 $23,161 $16,241 08/31/22 $15,680 $22,217 $15,271 09/30/22 $13,713 $20,170 $13,411 10/31/22 $14,263 $21,804 $14,068 11/30/22 $15,130 $23,022 $14,879 12/31/22 $14,343 $21,696 $14,114 01/31/23 $15,864 $23,059 $15,621 02/28/23 $15,095 $22,496 $14,871 03/31/23 $14,719 $23,322 $14,493 04/30/23 $14,899 $23,686 $14,614 05/31/23 $14,392 $23,789 $14,143 06/30/23 $15,161 $25,361 $14,872 07/31/23 $15,569 $26,176 $15,296 08/31/23 $15,030 $25,759 $14,820 09/30/23 $13,999 $24,531 $13,812 10/31/23 $13,362 $24,015 $13,209 11/30/23 $14,833 $26,208 $14,604 12/31/23 $16,279 $27,399 $16,052 01/31/24 $15,627 $27,859 $15,386 02/29/24 $15,911 $29,347 $15,698 03/31/24 $16,196 $30,291 $16,021 04/30/24 $15,092 $29,054 $14,897 05/31/24 $15,845 $30,494 $15,581 06/30/24 $16,279 $31,589 $16,031 07/31/24 $17,332 $31,973 $17,029 08/31/24 $18,486 $32,749 $18,120 09/30/24 $19,030 $33,448 $18,610 10/31/24 $18,554 $33,145 $18,070 11/30/24 $19,352 $35,090 $18,846 12/31/24 $17,983 $34,254 $17,454
Average Annual Return [Table Text Block]	Name 1 Year 5 Years 10 Years SSRSX 10.46% 4.81% 6.04% S&P 500 ® 25.02% 14.53% 13.10% FTSE NAREIT Equity REITs Index 8.73% 4.27% 5.73%
Updated Performance Information Location [Text Block]	Updated performance information is available by calling 1-800-242-0134 www.ssga.com
AssetsNet	$ 21,619,006
Holdings Count | Holding	48
Advisory Fees Paid, Amount	$ 391,833
InvestmentCompanyPortfolioTurnover	38%
Additional Fund Statistics [Text Block]	Key Fund Statistics as of 12/31/2024 Total Net Assets $21,619,006 Number of Portfolio Holdings 48 Portfolio Turnover Rate 38% Total Advisory Fees Paid $391,833
Holdings [Text Block]	Top Ten Holdings Holdings % Equinix, Inc. 8.7% Prologis, Inc. 6.9% Welltower, Inc. 6.3% Digital Realty Trust, Inc. 4.8% UDR, Inc. 4.1% Invitation Homes, Inc. 4.1% Ventas, Inc. 3.9% Extra Space Storage, Inc. 3.8% Equity Residential 3.6% Simon Property Group, Inc. 3.5% Top Industry Industry % Specialized REITs 27.8% Retail REITs 17.1% Residential REITs 17.0% Health Care REITs 16.2% Industrial REITs 12.1% Office REITs 5.2% Hotel & Resort REITs 3.2% Diversified REITs 0.7%
C000004450
Shareholder Report [Line Items]
Fund Name	State Street S&amp;P 500 Index V.I.S. Fund
Trading Symbol	SSSPX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about the State Street S&amp;P 500 Index V.I.S. Fund (the "Fund") for the period of January 1, 2024 to December 31, 2024.
Shareholder Report Annual or Semi-Annual	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 www.ssga.com/us/en/individual/fund-finder?tab=documents&type=mf
Additional Information Phone Number	1-800-242-0134
Additional Information Website	www.ssga.com/us/en/individual/fund-finder?tab=documents&type=mf</span>" id="sjs-B87">&lt;span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 14.4px; margin: 0px; overflow: visible; text-align: left;">www.ssga.com/us/en/individual/fund-finder?tab=documents&amp;type=mf&lt;/span>
Expenses [Text Block]	What were the Fund costs for the last year (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 $34 0.30%
Expenses Paid, Amount	$ 34
Expense Ratio, Percent	0.30%
Factors Affecting Performance [Text Block]	How did the Fund perform last year and what affected its performance? Global economic activity expanded further in the fourth quarter, closing 2024 on a high note as strong growth in service sector activity offset manufacturing weakness. U.S. equities delivered a strong performance in 2024, with the S&P 500 bringing the year’s tally to almost 25%, making it the top-performing equity market. While the Magnificent Seven continued to generate outsized returns, broader economic momentum began to translate into stronger earnings expectations, a trend likely to persist into 2025. Inflation ticked higher in major developed economies, sitting above central banks targets, while unemployment rate remained at or near historical lows. Although this outlook has risks, viz. tariffs and deportations, lower interest rates should spur demand. All sectors but materials were positive, with communication services (+39.76%) and information technology (+36.33%) leading the performance. The weakest sector was materials (-0.67%). On security basis top positive securities were NVIDIA, Apple, and Amazon. The weakest contributors were Intel, Adobe, and Boeing.
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future. The returns do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or on the redemption or sale of Fund shares.
Line Graph [Table Text Block]	SSSPX S&P 500 ® 12/31/14 $10,000 $10,000 01/31/15 $9,697 $9,700 02/28/15 $10,251 $10,257 03/31/15 $10,085 $10,095 04/30/15 $10,180 $10,192 05/31/15 $10,309 $10,323 06/30/15 $10,107 $10,123 07/31/15 $10,320 $10,335 08/31/15 $9,691 $9,712 09/30/15 $9,448 $9,471 10/31/15 $10,243 $10,270 11/30/15 $10,270 $10,301 12/31/15 $10,107 $10,138 01/31/16 $9,601 $9,635 02/29/16 $9,590 $9,622 03/31/16 $10,239 $10,275 04/30/16 $10,272 $10,315 05/31/16 $10,454 $10,500 06/30/16 $10,476 $10,527 07/31/16 $10,862 $10,915 08/31/16 $10,873 $10,931 09/30/16 $10,871 $10,933 10/31/16 $10,672 $10,733 11/30/16 $11,066 $11,131 12/31/16 $11,281 $11,351 01/31/17 $11,494 $11,566 02/28/17 $11,948 $12,025 03/31/17 $11,960 $12,039 04/30/17 $12,081 $12,163 05/31/17 $12,246 $12,334 06/30/17 $12,320 $12,411 07/31/17 $12,568 $12,666 08/31/17 $12,604 $12,705 09/30/17 $12,860 $12,967 10/31/17 $13,155 $13,270 11/30/17 $13,557 $13,677 12/31/17 $13,707 $13,829 01/31/18 $14,487 $14,621 02/28/18 $13,949 $14,082 03/31/18 $13,592 $13,724 04/30/18 $13,639 $13,777 05/31/18 $13,962 $14,108 06/30/18 $14,046 $14,195 07/31/18 $14,562 $14,724 08/31/18 $15,034 $15,203 09/30/18 $15,115 $15,290 10/31/18 $14,074 $14,245 11/30/18 $14,363 $14,535 12/31/18 $13,059 $13,223 01/31/19 $14,100 $14,282 02/28/19 $14,548 $14,741 03/31/19 $14,829 $15,027 04/30/19 $15,425 $15,636 05/31/19 $14,439 $14,642 06/30/19 $15,452 $15,674 07/31/19 $15,672 $15,899 08/31/19 $15,418 $15,648 09/30/19 $15,706 $15,940 10/31/19 $16,038 $16,286 11/30/19 $16,617 $16,877 12/31/19 $17,113 $17,386 01/31/20 $17,102 $17,379 02/29/20 $15,688 $15,949 03/31/20 $13,728 $13,979 04/30/20 $15,486 $15,771 05/31/20 $16,220 $16,522 06/30/20 $16,540 $16,850 07/31/20 $17,469 $17,801 08/31/20 $18,721 $19,080 09/30/20 $18,001 $18,355 10/31/20 $17,520 $17,867 11/30/20 $19,433 $19,823 12/31/20 $20,180 $20,585 01/31/21 $19,974 $20,377 02/28/21 $20,519 $20,939 03/31/21 $21,416 $21,856 04/30/21 $22,555 $23,022 05/31/21 $22,704 $23,183 06/30/21 $23,225 $23,724 07/31/21 $23,762 $24,288 08/31/21 $24,477 $25,026 09/30/21 $23,334 $23,863 10/31/21 $24,958 $25,534 11/30/21 $24,776 $25,357 12/31/21 $25,884 $26,494 01/31/22 $24,540 $25,123 02/28/22 $23,812 $24,371 03/31/22 $24,688 $25,276 04/30/22 $22,535 $23,071 05/31/22 $22,567 $23,114 06/30/22 $20,692 $21,206 07/31/22 $22,598 $23,161 08/31/22 $21,672 $22,217 09/30/22 $19,667 $20,170 10/31/22 $21,263 $21,804 11/30/22 $22,445 $23,022 12/31/22 $21,144 $21,696 01/31/23 $22,467 $23,059 02/28/23 $21,913 $22,496 03/31/23 $22,709 $23,322 04/30/23 $23,057 $23,686 05/31/23 $23,152 $23,789 06/30/23 $24,675 $25,361 07/31/23 $25,465 $26,176 08/31/23 $25,054 $25,759 09/30/23 $23,858 $24,531 10/31/23 $23,357 $24,015 11/30/23 $25,481 $26,208 12/31/23 $26,632 $27,399 01/31/24 $27,074 $27,859 02/29/24 $28,514 $29,347 03/31/24 $29,425 $30,291 04/30/24 $28,216 $29,054 05/31/24 $29,607 $30,494 06/30/24 $30,661 $31,589 07/31/24 $31,025 $31,973 08/31/24 $31,770 $32,749 09/30/24 $32,443 $33,448 10/31/24 $32,140 $33,145 11/30/24 $34,011 $35,090 12/31/24 $33,191 $34,254
Average Annual Return [Table Text Block]	Name 1 Year 5 Years 10 Years SSSPX 24.63% 14.17% 12.75% S&P 500 ® 25.02% 14.53% 13.10%
Updated Performance Information Location [Text Block]	Updated performance information is available by calling 1-800-242-0134 www.ssga.com
AssetsNet	$ 200,149,123
Holdings Count | Holding	506
Advisory Fees Paid, Amount	$ 486,755
InvestmentCompanyPortfolioTurnover	2%
Additional Fund Statistics [Text Block]	Key Fund Statistics as of 12/31/2024 Total Net Assets $200,149,123 Number of Portfolio Holdings 506 Portfolio Turnover Rate 2% Total Advisory Fees Paid $486,755
Holdings [Text Block]	Top Ten Holdings Holdings % Apple, Inc. 7.6% NVIDIA Corp. 6.6% Microsoft Corp. 6.3% Amazon.com, Inc. 4.1% Meta Platforms, Inc., Class A 2.6% Tesla, Inc. 2.3% Alphabet, Inc., Class A 2.2% Broadcom, Inc. 2.2% Alphabet, Inc., Class C 1.8% Berkshire Hathaway, Inc., Class B 1.7% Top Ten Industry Industry % Semiconductors & Semiconductor Equipment 11.5% Software 10.4% Technology Hardware, Storage & Peripherals 7.9% Interactive Media & Services 6.6% Financial Services 4.4% Broadline Retail 4.2% Banks 3.4% Capital Markets 3.1% Pharmaceuticals 3.1% Oil, Gas & Consumable Fuels 2.9%
C000004438
Shareholder Report [Line Items]
Fund Name	State Street Small-Cap Equity V.I.S. Fund
Trading Symbol	SSSEX
Annual or Semi-Annual Statement [Text Block]	This 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, 2024 to December 31, 2024.
Shareholder Report Annual or Semi-Annual	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 www.ssga.com/us/en/individual/fund-finder?tab=documents&type=mf
Material Fund Change Notice [Text Block]	This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number	1-800-242-0134
Additional Information Website	www.ssga.com/us/en/individual/fund-finder?tab=documents&type=mf</span>" id="sjs-B111">&lt;span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 14.4px; margin: 0px; overflow: visible; text-align: left;">www.ssga.com/us/en/individual/fund-finder?tab=documents&amp;type=mf&lt;/span>
Expenses [Text Block]	What were the Fund costs for the last year (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 $151 1.44%
Expenses Paid, Amount	$ 151
Expense Ratio, Percent	1.44%
Factors Affecting Performance [Text Block]	How did the Fund perform last year and what affected its performance? Champlain, Palisade and Kennedy were primary drivers of Fund performance over the reporting period, relative to the funds Index. Champlain and Palisade, both core allocations within the portfolio had a very strong relative year, outperforming the Index by 3.45% and 2.06%, respectively, followed by Kennedy outperforming by 2.91%. SouthernSun, another core allocation and Westfield, the funds growth manager each had a tougher year underperforming the index by -5.87% and -2.49%, respectively. From a sector standpoint over the last year, sector allocations were the main driver of relative results while security selection offset some of the positive results and detracted from relative results. Security selection in consumer discretionary and financials, along with allocation effect in consumer staples and health care were top contributors. Top detractors were security selection in consumer staples and healthcare over the reporting period. On an individual security level, the top relative contributors to the Fund’s performance were Boot Barn Holdings, Pure Storage and Dycom Industries. The top relative detractors over the reporting period were MGP Ingredients, Super Micro Computer and Darling International.
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future. The returns do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or on the redemption or sale of Fund shares.
Line Graph [Table Text Block]	SSSEX S&P 500 ® Russell 2000 ® 12/31/14 $10,000 $10,000 $10,000 01/31/15 $9,562 $9,700 $9,678 02/28/15 $10,250 $10,257 $10,253 03/31/15 $10,396 $10,095 $10,432 04/30/15 $10,202 $10,192 $10,165 05/31/15 $10,327 $10,323 $10,398 06/30/15 $10,459 $10,123 $10,475 07/31/15 $10,306 $10,335 $10,354 08/31/15 $9,729 $9,712 $9,703 09/30/15 $9,277 $9,471 $9,227 10/31/15 $9,785 $10,270 $9,747 11/30/15 $10,083 $10,301 $10,064 12/31/15 $9,588 $10,138 $9,559 01/31/16 $8,873 $9,635 $8,718 02/29/16 $8,935 $9,622 $8,718 03/31/16 $9,706 $10,275 $9,413 04/30/16 $9,949 $10,315 $9,561 05/31/16 $10,138 $10,500 $9,777 06/30/16 $10,161 $10,527 $9,770 07/31/16 $10,696 $10,915 $10,354 08/31/16 $10,924 $10,931 $10,537 09/30/16 $10,924 $10,933 $10,654 10/31/16 $10,601 $10,733 $10,148 11/30/16 $11,615 $11,131 $11,279 12/31/16 $11,866 $11,351 $11,595 01/31/17 $11,957 $11,566 $11,641 02/28/17 $12,163 $12,025 $11,866 03/31/17 $12,188 $12,039 $11,881 04/30/17 $12,361 $12,163 $12,012 05/31/17 $12,188 $12,334 $11,767 06/30/17 $12,468 $12,411 $12,174 07/31/17 $12,558 $12,666 $12,264 08/31/17 $12,344 $12,705 $12,108 09/30/17 $13,036 $12,967 $12,864 10/31/17 $13,119 $13,270 $12,974 11/30/17 $13,382 $13,677 $13,348 12/31/17 $13,374 $13,829 $13,294 01/31/18 $13,710 $14,621 $13,641 02/28/18 $13,147 $14,082 $13,113 03/31/18 $13,265 $13,724 $13,283 04/30/18 $13,420 $13,777 $13,397 05/31/18 $14,200 $14,108 $14,211 06/30/18 $14,391 $14,195 $14,312 07/31/18 $14,636 $14,724 $14,562 08/31/18 $15,217 $15,203 $15,190 09/30/18 $15,018 $15,290 $14,824 10/31/18 $13,356 $14,245 $13,214 11/30/18 $13,665 $14,535 $13,424 12/31/18 $12,077 $13,223 $11,830 01/31/19 $13,410 $14,282 $13,160 02/28/19 $14,033 $14,741 $13,845 03/31/19 $13,796 $15,027 $13,555 04/30/19 $14,387 $15,636 $14,015 05/31/19 $13,227 $14,642 $12,925 06/30/19 $14,226 $15,674 $13,839 07/31/19 $14,269 $15,899 $13,918 08/31/19 $13,581 $15,648 $13,231 09/30/19 $14,054 $15,940 $13,507 10/31/19 $14,301 $16,286 $13,862 11/30/19 $14,903 $16,877 $14,433 12/31/19 $15,232 $17,386 $14,849 01/31/20 $14,595 $17,379 $14,373 02/29/20 $13,137 $15,949 $13,163 03/31/20 $10,440 $13,979 $10,303 04/30/20 $11,933 $15,771 $11,718 05/31/20 $12,697 $16,522 $12,481 06/30/20 $12,963 $16,850 $12,922 07/31/20 $13,623 $17,801 $13,280 08/31/20 $14,225 $19,080 $14,028 09/30/20 $13,554 $18,355 $13,559 10/31/20 $14,017 $17,867 $13,843 11/30/20 $16,204 $19,823 $16,395 12/31/20 $17,445 $20,585 $17,813 01/31/21 $17,850 $20,377 $18,709 02/28/21 $19,064 $20,939 $19,876 03/31/21 $19,671 $21,856 $20,075 04/30/21 $20,313 $23,022 $20,497 05/31/21 $20,337 $23,183 $20,539 06/30/21 $20,277 $23,724 $20,937 07/31/21 $20,206 $24,288 $20,181 08/31/21 $20,563 $25,026 $20,632 09/30/21 $19,849 $23,863 $20,024 10/31/21 $20,813 $25,534 $20,876 11/30/21 $20,158 $25,357 $20,006 12/31/21 $21,027 $26,494 $20,453 01/31/22 $19,351 $25,123 $18,484 02/28/22 $19,253 $24,371 $18,681 03/31/22 $19,267 $25,276 $18,914 04/30/22 $17,788 $23,071 $17,039 05/31/22 $17,901 $23,114 $17,065 06/30/22 $16,591 $21,206 $15,661 07/31/22 $18,182 $23,161 $17,296 08/31/22 $17,675 $22,217 $16,942 09/30/22 $16,196 $20,170 $15,319 10/31/22 $18,239 $21,804 $17,005 11/30/22 $18,872 $23,022 $17,402 12/31/22 $17,790 $21,696 $16,273 01/31/23 $19,405 $23,059 $17,859 02/28/23 $19,180 $22,496 $17,557 03/31/23 $18,373 $23,322 $16,718 04/30/23 $18,044 $23,686 $16,418 05/31/23 $17,655 $23,789 $16,266 06/30/23 $19,195 $25,361 $17,589 07/31/23 $20,032 $26,176 $18,664 08/31/23 $19,300 $25,759 $17,731 09/30/23 $18,164 $24,531 $16,687 10/31/23 $16,998 $24,015 $15,549 11/30/23 $18,209 $26,208 $16,956 12/31/23 $20,201 $27,399 $19,028 01/31/24 $19,532 $27,859 $18,288 02/29/24 $20,577 $29,347 $19,322 03/31/24 $21,214 $30,291 $20,013 04/30/24 $19,923 $29,054 $18,605 05/31/24 $20,756 $30,494 $19,538 06/30/24 $20,446 $31,589 $19,357 07/31/24 $21,883 $31,973 $21,324 08/31/24 $22,063 $32,749 $21,006 09/30/24 $22,226 $33,448 $21,152 10/31/24 $21,769 $33,145 $20,847 11/30/24 $24,022 $35,090 $23,134 12/31/24 $22,286 $34,254 $21,223
Average Annual Return [Table Text Block]	Name 1 Year 5 Years 10 Years SSSEX 10.32% 7.91% 8.34% S&P 500 ® 25.02% 14.53% 13.10% Russell 2000 ® 11.54% 7.40% 7.82%
Material Change Date	Dec. 31, 2024
Updated Performance Information Location [Text Block]	Updated performance information is available by calling 1-800-242-0134 www.ssga.com
AssetsNet	$ 25,277,576
Holdings Count | Holding	326
Advisory Fees Paid, Amount	$ 244,658
InvestmentCompanyPortfolioTurnover	42%
Additional Fund Statistics [Text Block]	Key Fund Statistics as of 12/31/2024 Total Net Assets $25,277,576 Number of Portfolio Holdings 326 Portfolio Turnover Rate 42% Total Advisory Fees Paid $244,658
Holdings [Text Block]	Top Ten Holdings Holdings % Belden, Inc. 1.3% Enerpac Tool Group Corp. 1.3% Brink's Co. 1.2% Darling Ingredients, Inc. 1.1% Boot Barn Holdings, Inc. 1.1% U.S. Physical Therapy, Inc. 1.1% Louisiana-Pacific Corp. 1.1% Cullen/Frost Bankers, Inc. 1.1% Repligen Corp. 1.0% RB Global, Inc. 0.9% Top Ten Industry Industry % Banks 9.3% Machinery 8.6% Software 7.6% Healthcare Equipment & Supplies 4.9% Commercial Services & Supplies 4.3% Specialty Retail 3.7% Chemicals 3.4% Food Products 3.2% Insurance 3.2% Electronic Equipment, Instruments & Components 3.1%
Material Fund Change Adviser [Text Block]	As approved by the Board of Trustees of the Trust, Westfield Capital Management Company, L.P. became a sub-adviser to the Fund effective March 1, 2024.
Summary of Change Legend [Text Block]	This is a summary of certain changes of the Fund since December 31, 2024. For more information contact 1-800-242-0134 (toll free) or wait for the next filing to be available.
C000004439
Shareholder Report [Line Items]
Fund Name	State Street Total Return V.I.S. Fund
Trading Symbol	SSTIX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about the State Street Total Return V.I.S. Fund (the "Fund") for the period of January 1, 2024 to December 31, 2024.
Shareholder Report Annual or Semi-Annual	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 www.ssga.com/us/en/individual/fund-finder?tab=documents&type=mf
Additional Information Phone Number	1-800-242-0134
Additional Information Website	www.ssga.com/us/en/individual/fund-finder?tab=documents&type=mf</span>" id="sjs-B137">&lt;span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 14.4px; margin: 0px; overflow: visible; text-align: left;">www.ssga.com/us/en/individual/fund-finder?tab=documents&amp;type=mf&lt;/span>
Expenses [Text Block]	What were the Fund costs for the last year (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 $63 0.60%
Expenses Paid, Amount	$ 63
Expense Ratio, Percent	0.60%
Factors Affecting Performance [Text Block]	How did the Fund perform last year and what affected its performance? The main drivers of the Fund outperformance relative to the blended benchmark was the overweight position to US equity and the underweight position to US investment grade fixed income throughout the reporting period. On an individual security level, the top positive contributors to the Fund’s performance on an absolute basis during the reporting period were U.S. Large Cap Equity, Emerging Market Equity, and U.S. Small Cap Equity. The Fund’s position in non-US Government bonds was a negative contributor to the Fund’s performance on an absolute basis during the reporting period. Tactical positioning within global equity and fixed income markets were the primary drivers of Fund performance during the reporting period relative to the Index. The Fund did not invest in derivatives during the reporting period.
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future. The returns do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or on the redemption or sale of Fund shares.
Line Graph [Table Text Block]	SSTIX S&P 500 ® Bloomberg US Aggregate Bond Index MSCI All Country World Index ex-USA 12/31/14 $10,000 $10,000 $10,000 $10,000 01/31/15 $9,936 $9,700 $10,210 $9,985 02/28/15 $10,271 $10,257 $10,114 $10,519 03/31/15 $10,181 $10,095 $10,161 $10,349 04/30/15 $10,330 $10,192 $10,124 $10,872 05/31/15 $10,340 $10,323 $10,100 $10,702 06/30/15 $10,159 $10,123 $9,990 $10,403 07/31/15 $10,239 $10,335 $10,059 $10,375 08/31/15 $9,798 $9,712 $10,045 $9,582 09/30/15 $9,612 $9,471 $10,113 $9,137 10/31/15 $10,069 $10,270 $10,114 $9,818 11/30/15 $10,021 $10,301 $10,088 $9,615 12/31/15 $9,887 $10,138 $10,055 $9,434 01/31/16 $9,590 $9,635 $10,193 $8,792 02/29/16 $9,562 $9,622 $10,266 $8,692 03/31/16 $10,027 $10,275 $10,360 $9,398 04/30/16 $10,116 $10,315 $10,400 $9,646 05/31/16 $10,139 $10,500 $10,402 $9,483 06/30/16 $10,183 $10,527 $10,589 $9,338 07/31/16 $10,447 $10,915 $10,656 $9,800 08/31/16 $10,469 $10,931 $10,644 $9,862 09/30/16 $10,503 $10,933 $10,638 $9,983 10/31/16 $10,357 $10,733 $10,556 $9,840 11/30/16 $10,368 $11,131 $10,307 $9,612 12/31/16 $10,514 $11,351 $10,321 $9,858 01/31/17 $10,688 $11,566 $10,341 $10,207 02/28/17 $10,915 $12,025 $10,411 $10,370 03/31/17 $10,979 $12,039 $10,405 $10,633 04/30/17 $11,113 $12,163 $10,486 $10,860 05/31/17 $11,287 $12,334 $10,566 $11,213 06/30/17 $11,322 $12,411 $10,556 $11,248 07/31/17 $11,532 $12,666 $10,601 $11,662 08/31/17 $11,578 $12,705 $10,696 $11,723 09/30/17 $11,718 $12,967 $10,645 $11,941 10/31/17 $11,869 $13,270 $10,652 $12,165 11/30/17 $12,026 $13,677 $10,638 $12,264 12/31/17 $12,152 $13,829 $10,687 $12,538 01/31/18 $12,536 $14,621 $10,564 $13,237 02/28/18 $12,134 $14,082 $10,464 $12,613 03/31/18 $12,018 $13,724 $10,531 $12,390 04/30/18 $12,036 $13,777 $10,452 $12,588 05/31/18 $12,103 $14,108 $10,527 $12,297 06/30/18 $12,061 $14,195 $10,514 $12,066 07/31/18 $12,310 $14,724 $10,516 $12,355 08/31/18 $12,451 $15,203 $10,584 $12,096 09/30/18 $12,414 $15,290 $10,516 $12,151 10/31/18 $11,811 $14,245 $10,433 $11,163 11/30/18 $11,890 $14,535 $10,495 $11,269 12/31/18 $11,381 $13,223 $10,688 $10,758 01/31/19 $11,980 $14,282 $10,801 $11,571 02/28/19 $12,158 $14,741 $10,795 $11,797 03/31/19 $12,280 $15,027 $11,002 $11,868 04/30/19 $12,466 $15,636 $11,005 $12,181 05/31/19 $12,126 $14,642 $11,201 $11,527 06/30/19 $12,628 $15,674 $11,341 $12,222 07/31/19 $12,636 $15,899 $11,366 $12,074 08/31/19 $12,571 $15,648 $11,661 $11,701 09/30/19 $12,709 $15,940 $11,599 $12,002 10/31/19 $12,863 $16,286 $11,634 $12,421 11/30/19 $12,984 $16,877 $11,628 $12,530 12/31/19 $13,181 $17,386 $11,620 $13,073 01/31/20 $13,065 $17,379 $11,843 $12,722 02/29/20 $12,402 $15,949 $12,056 $11,716 03/31/20 $10,944 $13,979 $11,985 $10,020 04/30/20 $11,656 $15,771 $12,198 $10,779 05/31/20 $11,996 $16,522 $12,255 $11,132 06/30/20 $12,220 $16,850 $12,332 $11,635 07/31/20 $12,742 $17,801 $12,517 $12,153 08/31/20 $13,040 $19,080 $12,416 $12,674 09/30/20 $12,841 $18,355 $12,409 $12,362 10/31/20 $12,700 $17,867 $12,353 $12,096 11/30/20 $13,678 $19,823 $12,475 $13,724 12/31/20 $14,030 $20,585 $12,492 $14,465 01/31/21 $14,123 $20,377 $12,402 $14,497 02/28/21 $14,249 $20,939 $12,223 $14,784 03/31/21 $14,612 $21,856 $12,071 $14,971 04/30/21 $15,084 $23,022 $12,166 $15,411 05/31/21 $15,279 $23,183 $12,206 $15,893 06/30/21 $15,473 $23,724 $12,291 $15,790 07/31/21 $15,557 $24,288 $12,429 $15,530 08/31/21 $15,785 $25,026 $12,405 $15,825 09/30/21 $15,312 $23,863 $12,298 $15,319 10/31/21 $15,852 $25,534 $12,294 $15,684 11/30/21 $15,532 $25,357 $12,331 $14,978 12/31/21 $15,917 $26,494 $12,299 $15,597 01/31/22 $15,292 $25,123 $12,034 $15,022 02/28/22 $15,045 $24,371 $11,900 $14,725 03/31/22 $15,074 $25,276 $11,569 $14,748 04/30/22 $14,083 $23,071 $11,130 $13,822 05/31/22 $14,123 $23,114 $11,202 $13,922 06/30/22 $13,271 $21,206 $11,026 $12,724 07/31/22 $13,905 $23,161 $11,296 $13,160 08/31/22 $13,409 $22,217 $10,977 $12,736 09/30/22 $12,448 $20,170 $10,502 $11,464 10/31/22 $12,914 $21,804 $10,366 $11,806 11/30/22 $13,687 $23,022 $10,748 $13,200 12/31/22 $13,289 $21,696 $10,699 $13,101 01/31/23 $14,093 $23,059 $11,028 $14,164 02/28/23 $13,666 $22,496 $10,743 $13,667 03/31/23 $13,991 $23,322 $11,016 $14,001 04/30/23 $14,134 $23,686 $11,083 $14,244 05/31/23 $13,920 $23,789 $10,962 $13,726 06/30/23 $14,490 $25,361 $10,923 $14,342 07/31/23 $14,877 $26,176 $10,915 $14,925 08/31/23 $14,531 $25,759 $10,846 $14,251 09/30/23 $14,002 $24,531 $10,570 $13,801 10/31/23 $13,656 $24,015 $10,403 $13,231 11/30/23 $14,622 $26,208 $10,874 $14,422 12/31/23 $15,347 $27,399 $11,291 $15,147 01/31/24 $15,285 $27,859 $11,260 $14,996 02/29/24 $15,722 $29,347 $11,100 $15,376 03/31/24 $16,117 $30,291 $11,203 $15,857 04/30/24 $15,638 $29,054 $10,920 $15,572 05/31/24 $16,159 $30,494 $11,105 $16,024 06/30/24 $16,346 $31,589 $11,210 $16,009 07/31/24 $16,731 $31,973 $11,472 $16,380 08/31/24 $16,970 $32,749 $11,637 $16,846 09/30/24 $17,345 $33,448 $11,793 $17,300 10/31/24 $16,981 $33,145 $11,500 $16,451 11/30/24 $17,501 $35,090 $11,622 $16,302 12/31/24 $17,083 $34,254 $11,432 $15,985
Average Annual Return [Table Text Block]	Name 1 Year 5 Years 10 Years SSTIX 11.31% 5.32% 5.50% S&P 500 ® 25.02% 14.53% 13.10% Bloomberg US Aggregate Bond Index 1.25% (0.33%) 1.35% MSCI All Country World Index ex-USA 5.53% 4.10% 4.80%
Updated Performance Information Location [Text Block]	Updated performance information is available by calling 1-800-242-0134 www.ssga.com
AssetsNet	$ 1,058,203,231
Holdings Count | Holding	4,966
Advisory Fees Paid, Amount	$ 4,125,737
InvestmentCompanyPortfolioTurnover	77%
Additional Fund Statistics [Text Block]	Key Fund Statistics as of 12/31/2024 Total Net Assets $1,058,203,231 Number of Portfolio Holdings 4,966 Portfolio Turnover Rate 77% Total Advisory Fees Paid $4,125,737
Holdings [Text Block]	Top Ten Holdings Holdings % SPDR Portfolio Aggregate Bond ETF 15.7% SPDR Bloomberg High Yield Bond ETF 9.7% Apple, Inc. 2.2% NVIDIA Corp. 1.9% Microsoft Corp. 1.9% Amazon.com, Inc. 1.3% Taiwan Semiconductor Manufacturing Co. Ltd. 1.1% Meta Platforms, Inc., Class A 0.8% Tesla, Inc. 0.7% Alphabet, Inc., Class A 0.7% Top Security Type Asset % Common Stocks 60.9% Mutual Funds and Exchange Traded Products 25.5% Short-Term Investments 8.2% U.S. Treasury Obligations 5.0% Preferred Stock 0.2%
C000033161
Shareholder Report [Line Items]
Fund Name	State Street Total Return V.I.S. Fund
Trading Symbol	SSTTX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains important information about the State Street Total Return V.I.S. Fund (the "Fund") for the period of January 1, 2024 to December 31, 2024.
Shareholder Report Annual or Semi-Annual	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 www.ssga.com/us/en/individual/fund-finder?tab=documents&type=mf
Additional Information Phone Number	1-800-242-0134
Additional Information Website	www.ssga.com/us/en/individual/fund-finder?tab=documents&type=mf</span>" id="sjs-B160">&lt;span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 14.4px; margin: 0px; overflow: visible; text-align: left;">www.ssga.com/us/en/individual/fund-finder?tab=documents&amp;type=mf&lt;/span>
Expenses [Text Block]	What were the Fund costs for the last year (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 $90 0.85%
Expenses Paid, Amount	$ 90
Expense Ratio, Percent	0.85%
Factors Affecting Performance [Text Block]	How did the Fund perform last year and what affected its performance? The main drivers of the Fund outperformance relative to the blended benchmark was the overweight position to US equity and the underweight position to US investment grade fixed income throughout the reporting period. On an individual security level, the top positive contributors to the Fund’s performance on an absolute basis during the reporting period were U.S. Large Cap Equity, Emerging Market Equity, and U.S. Small Cap Equity. The Fund’s position in non-US Government bonds was a negative contributor to the Fund’s performance on an absolute basis during the reporting period. Tactical positioning within global equity and fixed income markets were the primary drivers of Fund performance during the reporting period relative to the Index. The Fund did not invest in derivatives during the reporting period.
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future. The returns do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or on the redemption or sale of Fund shares.
Line Graph [Table Text Block]	SSTTX S&P 500 ® Bloomberg US Aggregate Bond Index MSCI All Country World Index ex-USA 12/31/14 $10,000 $10,000 $10,000 $10,000 01/31/15 $9,936 $9,700 $10,210 $9,985 02/28/15 $10,267 $10,257 $10,114 $10,519 03/31/15 $10,176 $10,095 $10,161 $10,349 04/30/15 $10,320 $10,192 $10,124 $10,872 05/31/15 $10,331 $10,323 $10,100 $10,702 06/30/15 $10,149 $10,123 $9,990 $10,403 07/31/15 $10,224 $10,335 $10,059 $10,375 08/31/15 $9,787 $9,712 $10,045 $9,582 09/30/15 $9,595 $9,471 $10,113 $9,137 10/31/15 $10,048 $10,270 $10,114 $9,818 11/30/15 $10,000 $10,301 $10,088 $9,615 12/31/15 $9,866 $10,138 $10,055 $9,434 01/31/16 $9,563 $9,635 $10,193 $8,792 02/29/16 $9,535 $9,622 $10,266 $8,692 03/31/16 $9,995 $10,275 $10,360 $9,398 04/30/16 $10,084 $10,315 $10,400 $9,646 05/31/16 $10,101 $10,500 $10,402 $9,483 06/30/16 $10,146 $10,527 $10,589 $9,338 07/31/16 $10,409 $10,915 $10,656 $9,800 08/31/16 $10,426 $10,931 $10,644 $9,862 09/30/16 $10,454 $10,933 $10,638 $9,983 10/31/16 $10,308 $10,733 $10,556 $9,840 11/30/16 $10,320 $11,131 $10,307 $9,612 12/31/16 $10,466 $11,351 $10,321 $9,858 01/31/17 $10,634 $11,566 $10,341 $10,207 02/28/17 $10,860 $12,025 $10,411 $10,370 03/31/17 $10,918 $12,039 $10,405 $10,633 04/30/17 $11,046 $12,163 $10,486 $10,860 05/31/17 $11,220 $12,334 $10,566 $11,213 06/30/17 $11,255 $12,411 $10,556 $11,248 07/31/17 $11,458 $12,666 $10,601 $11,662 08/31/17 $11,505 $12,705 $10,696 $11,723 09/30/17 $11,638 $12,967 $10,645 $11,941 10/31/17 $11,789 $13,270 $10,652 $12,165 11/30/17 $11,940 $13,677 $10,638 $12,264 12/31/17 $12,063 $13,829 $10,687 $12,538 01/31/18 $12,445 $14,621 $10,564 $13,237 02/28/18 $12,039 $14,082 $10,464 $12,613 03/31/18 $11,923 $13,724 $10,531 $12,390 04/30/18 $11,936 $13,777 $10,452 $12,588 05/31/18 $12,002 $14,108 $10,527 $12,297 06/30/18 $11,960 $14,195 $10,514 $12,066 07/31/18 $12,203 $14,724 $10,516 $12,355 08/31/18 $12,336 $15,203 $10,584 $12,096 09/30/18 $12,300 $15,290 $10,516 $12,151 10/31/18 $11,705 $14,245 $10,433 $11,163 11/30/18 $11,772 $14,535 $10,495 $11,269 12/31/18 $11,266 $13,223 $10,688 $10,758 01/31/19 $11,861 $14,282 $10,801 $11,571 02/28/19 $12,030 $14,741 $10,795 $11,797 03/31/19 $12,150 $15,027 $11,002 $11,868 04/30/19 $12,335 $15,636 $11,005 $12,181 05/31/19 $11,998 $14,642 $11,201 $11,527 06/30/19 $12,488 $15,674 $11,341 $12,222 07/31/19 $12,488 $15,899 $11,366 $12,074 08/31/19 $12,424 $15,648 $11,661 $11,701 09/30/19 $12,561 $15,940 $11,599 $12,002 10/31/19 $12,705 $16,286 $11,634 $12,421 11/30/19 $12,826 $16,877 $11,628 $12,530 12/31/19 $13,020 $17,386 $11,620 $13,073 01/31/20 $12,897 $17,379 $11,843 $12,722 02/29/20 $12,240 $15,949 $12,056 $11,716 03/31/20 $10,803 $13,979 $11,985 $10,020 04/30/20 $11,501 $15,771 $12,198 $10,779 05/31/20 $11,838 $16,522 $12,255 $11,132 06/30/20 $12,059 $16,850 $12,332 $11,635 07/31/20 $12,568 $17,801 $12,517 $12,153 08/31/20 $12,856 $19,080 $12,416 $12,674 09/30/20 $12,667 $18,355 $12,409 $12,362 10/31/20 $12,519 $17,867 $12,353 $12,096 11/30/20 $13,480 $19,823 $12,475 $13,724 12/31/20 $13,819 $20,585 $12,492 $14,465 01/31/21 $13,911 $20,377 $12,402 $14,497 02/28/21 $14,027 $20,939 $12,223 $14,784 03/31/21 $14,386 $21,856 $12,071 $14,971 04/30/21 $14,845 $23,022 $12,166 $15,411 05/31/21 $15,037 $23,183 $12,206 $15,893 06/30/21 $15,220 $23,724 $12,291 $15,790 07/31/21 $15,303 $24,288 $12,429 $15,530 08/31/21 $15,520 $25,026 $12,405 $15,825 09/30/21 $15,062 $23,863 $12,298 $15,319 10/31/21 $15,587 $25,534 $12,294 $15,684 11/30/21 $15,262 $25,357 $12,331 $14,978 12/31/21 $15,643 $26,494 $12,299 $15,597 01/31/22 $15,027 $25,123 $12,034 $15,022 02/28/22 $14,783 $24,371 $11,900 $14,725 03/31/22 $14,812 $25,276 $11,569 $14,748 04/30/22 $13,835 $23,071 $11,130 $13,822 05/31/22 $13,864 $23,114 $11,202 $13,922 06/30/22 $13,023 $21,206 $11,026 $12,724 07/31/22 $13,649 $23,161 $11,296 $13,160 08/31/22 $13,160 $22,217 $10,977 $12,736 09/30/22 $12,212 $20,170 $10,502 $11,464 10/31/22 $12,661 $21,804 $10,366 $11,806 11/30/22 $13,414 $23,022 $10,748 $13,200 12/31/22 $13,028 $21,696 $10,699 $13,101 01/31/23 $13,817 $23,059 $11,028 $14,164 02/28/23 $13,397 $22,496 $10,743 $13,667 03/31/23 $13,707 $23,322 $11,016 $14,001 04/30/23 $13,837 $23,686 $11,083 $14,244 05/31/23 $13,627 $23,789 $10,962 $13,726 06/30/23 $14,186 $25,361 $10,923 $14,342 07/31/23 $14,565 $26,176 $10,915 $14,925 08/31/23 $14,216 $25,759 $10,846 $14,251 09/30/23 $13,697 $24,531 $10,570 $13,801 10/31/23 $13,357 $24,015 $10,403 $13,231 11/30/23 $14,296 $26,208 $10,874 $14,422 12/31/23 $15,009 $27,399 $11,291 $15,147 01/31/24 $14,938 $27,859 $11,260 $14,996 02/29/24 $15,365 $29,347 $11,100 $15,376 03/31/24 $15,752 $30,291 $11,203 $15,857 04/30/24 $15,274 $29,054 $10,920 $15,572 05/31/24 $15,783 $30,494 $11,105 $16,024 06/30/24 $15,956 $31,589 $11,210 $16,009 07/31/24 $16,343 $31,973 $11,472 $16,380 08/31/24 $16,567 $32,749 $11,637 $16,846 09/30/24 $16,923 $33,448 $11,793 $17,300 10/31/24 $16,567 $33,145 $11,500 $16,451 11/30/24 $17,076 $35,090 $11,622 $16,302 12/31/24 $16,668 $34,254 $11,432 $15,985
Average Annual Return [Table Text Block]	Name 1 Year 5 Years 10 Years SSTTX 11.06% 5.06% 5.24% S&P 500 ® 25.02% 14.53% 13.10% Bloomberg US Aggregate Bond Index 1.25% (0.33%) 1.35% MSCI All Country World Index ex-USA 5.53% 4.10% 4.80%
Updated Performance Information Location [Text Block]	Updated performance information is available by calling 1-800-242-0134 www.ssga.com
AssetsNet	$ 1,058,203,231
Holdings Count | Holding	4,966
Advisory Fees Paid, Amount	$ 4,125,737
InvestmentCompanyPortfolioTurnover	77%
Additional Fund Statistics [Text Block]	Key Fund Statistics as of 12/31/2024 Total Net Assets $1,058,203,231 Number of Portfolio Holdings 4,966 Portfolio Turnover Rate 77% Total Advisory Fees Paid $4,125,737
Holdings [Text Block]	Top Ten Holdings Holdings % SPDR Portfolio Aggregate Bond ETF 15.7% SPDR Bloomberg High Yield Bond ETF 9.7% Apple, Inc. 2.2% NVIDIA Corp. 1.9% Microsoft Corp. 1.9% Amazon.com, Inc. 1.3% Taiwan Semiconductor Manufacturing Co. Ltd. 1.1% Meta Platforms, Inc., Class A 0.8% Tesla, Inc. 0.7% Alphabet, Inc., Class A 0.7% Top Security Type Asset % Common Stocks 60.9% Mutual Funds and Exchange Traded Products 25.5% Short-Term Investments 8.2% U.S. Treasury Obligations 5.0% Preferred Stock 0.2%
C000004441
Shareholder Report [Line Items]
Fund Name	State Street U.S. Equity V.I.S. Fund
Trading Symbol	SSUSX
Annual or Semi-Annual Statement [Text Block]	This 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, 2024 to December 31, 2024.
Shareholder Report Annual or Semi-Annual	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 www.ssga.com/us/en/individual/fund-finder?tab=documents&type=mf
Additional Information Phone Number	1-800-242-0134
Additional Information Website	www.ssga.com/us/en/individual/fund-finder?tab=documents&type=mf</span>" id="sjs-B183">&lt;span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 14.4px; margin: 0px; overflow: visible; text-align: left;">www.ssga.com/us/en/individual/fund-finder?tab=documents&amp;type=mf&lt;/span>
Expenses [Text Block]	What were the Fund costs for the last year (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 $95 0.85%
Expenses Paid, Amount	$ 95
Expense Ratio, Percent	0.85%
Factors Affecting Performance [Text Block]	How did the Fund perform last year and what affected its performance? Primary drivers of relative performance included the following: Outperformance in IT. IT was the best performing Index sector during the reporting period rising 36.7%. On top of this strong return, the Fund outperformed by more than 7%, adding value through overweight positions in companies that are beneficiaries of Artificial Intelligence investment such as Nvidia and Broadcom. Outperformance in industrials. The Fund benefitted from holdings including Parker-Hannifin, Emerson Electric, Eaton, and Trane Technologies all of which significantly outperformed during the reporting period, as they benefitted from a range of tailwinds including infrastructure/capex spending driven by reshoring, green investment, and increased data center demand. Underperformance and Overweight in healthcare. The healthcare sector, which is more defensive, lagged in the strong risk-on market. This negatively impacted the Fund, which was overweight the sector. In addition, the Fund’s stock selections underperformed. The largest detracting positions included BioMarin Pharma (biotech), Merck (pharma) and Humana (healthcare services).
Performance Past Does Not Indicate Future [Text]	The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future. The returns do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or on the redemption or sale of Fund shares.
Line Graph [Table Text Block]	SSUSX S&P 500 ® 12/31/14 $10,000 $10,000 01/31/15 $9,581 $9,700 02/28/15 $10,186 $10,257 03/31/15 $10,047 $10,095 04/30/15 $10,122 $10,192 05/31/15 $10,246 $10,323 06/30/15 $10,083 $10,123 07/31/15 $10,361 $10,335 08/31/15 $9,657 $9,712 09/30/15 $9,236 $9,471 10/31/15 $10,062 $10,270 11/30/15 $10,029 $10,301 12/31/15 $9,770 $10,138 01/31/16 $9,127 $9,635 02/29/16 $9,104 $9,622 03/31/16 $9,668 $10,275 04/30/16 $9,746 $10,315 05/31/16 $9,998 $10,500 06/30/16 $9,871 $10,527 07/31/16 $10,278 $10,915 08/31/16 $10,355 $10,931 09/30/16 $10,412 $10,933 10/31/16 $10,179 $10,733 11/30/16 $10,500 $11,131 12/31/16 $10,679 $11,351 01/31/17 $10,984 $11,566 02/28/17 $11,419 $12,025 03/31/17 $11,480 $12,039 04/30/17 $11,640 $12,163 05/31/17 $11,688 $12,334 06/30/17 $11,787 $12,411 07/31/17 $12,067 $12,666 08/31/17 $12,077 $12,705 09/30/17 $12,270 $12,967 10/31/17 $12,496 $13,270 11/30/17 $12,748 $13,677 12/31/17 $12,806 $13,829 01/31/18 $13,530 $14,621 02/28/18 $13,113 $14,082 03/31/18 $12,817 $13,724 04/30/18 $12,803 $13,777 05/31/18 $13,092 $14,108 06/30/18 $13,208 $14,195 07/31/18 $13,759 $14,724 08/31/18 $14,112 $15,203 09/30/18 $14,260 $15,290 10/31/18 $13,240 $14,245 11/30/18 $13,576 $14,535 12/31/18 $12,371 $13,223 01/31/19 $13,394 $14,282 02/28/19 $13,739 $14,741 03/31/19 $14,025 $15,027 04/30/19 $14,648 $15,636 05/31/19 $13,742 $14,642 06/30/19 $14,788 $15,674 07/31/19 $14,938 $15,899 08/31/19 $14,655 $15,648 09/30/19 $14,837 $15,940 10/31/19 $15,250 $16,286 11/30/19 $15,805 $16,877 12/31/19 $16,301 $17,386 01/31/20 $16,356 $17,379 02/29/20 $15,142 $15,949 03/31/20 $13,396 $13,979 04/30/20 $15,180 $15,771 05/31/20 $15,985 $16,522 06/30/20 $16,245 $16,850 07/31/20 $17,258 $17,801 08/31/20 $18,598 $19,080 09/30/20 $17,852 $18,355 10/31/20 $17,491 $17,867 11/30/20 $19,285 $19,823 12/31/20 $19,991 $20,585 01/31/21 $19,668 $20,377 02/28/21 $20,321 $20,939 03/31/21 $21,177 $21,856 04/30/21 $22,396 $23,022 05/31/21 $22,576 $23,183 06/30/21 $23,041 $23,724 07/31/21 $23,585 $24,288 08/31/21 $24,077 $25,026 09/30/21 $23,004 $23,863 10/31/21 $24,508 $25,534 11/30/21 $24,088 $25,357 12/31/21 $25,087 $26,494 01/31/22 $24,075 $25,123 02/28/22 $23,206 $24,371 03/31/22 $23,734 $25,276 04/30/22 $21,684 $23,071 05/31/22 $21,720 $23,114 06/30/22 $19,990 $21,206 07/31/22 $21,884 $23,161 08/31/22 $20,974 $22,217 09/30/22 $19,005 $20,170 10/31/22 $20,362 $21,804 11/30/22 $21,520 $23,022 12/31/22 $20,343 $21,696 01/31/23 $21,725 $23,059 02/28/23 $21,071 $22,496 03/31/23 $21,685 $23,322 04/30/23 $22,114 $23,686 05/31/23 $22,434 $23,789 06/30/23 $23,826 $25,361 07/31/23 $24,555 $26,176 08/31/23 $24,285 $25,759 09/30/23 $23,107 $24,531 10/31/23 $22,808 $24,015 11/30/23 $24,904 $26,208 12/31/23 $26,020 $27,399 01/31/24 $26,617 $27,859 02/29/24 $28,337 $29,347 03/31/24 $29,229 $30,291 04/30/24 $28,019 $29,054 05/31/24 $29,326 $30,494 06/30/24 $30,470 $31,589 07/31/24 $30,777 $31,973 08/31/24 $31,513 $32,749 09/30/24 $31,997 $33,448 10/31/24 $31,626 $33,145 11/30/24 $33,217 $35,090 12/31/24 $32,407 $34,254
Average Annual Return [Table Text Block]	Name 1 Year 5 Years 10 Years SSUSX 24.55% 14.73% 12.48% S&P 500 ® 25.02% 14.53% 13.10%
Updated Performance Information Location [Text Block]	Updated performance information is available by calling 1-800-242-0134 www.ssga.com
AssetsNet	$ 21,080,665
Holdings Count | Holding	94
Advisory Fees Paid, Amount	$ 126,419
InvestmentCompanyPortfolioTurnover	45%
Additional Fund Statistics [Text Block]	Key Fund Statistics as of 12/31/2024 Total Net Assets $21,080,665 Number of Portfolio Holdings 94 Portfolio Turnover Rate 45% Total Advisory Fees Paid $126,419
Holdings [Text Block]	Top Ten Holdings Holdings % NVIDIA Corp. 7.7% Microsoft Corp. 7.0% Apple, Inc. 6.6% Amazon.com, Inc. 4.9% Alphabet, Inc., Class A 4.4% Meta Platforms, Inc., Class A 3.5% Broadcom, Inc. 2.7% Bank of America Corp. 2.3% JPMorgan Chase & Co. 2.2% Home Depot, Inc. 1.8% Top Ten Industry Industry % Semiconductors & Semiconductor Equipment 13.4% Software 11.8% Interactive Media & Services 8.5% Technology Hardware, Storage & Peripherals 6.6% Banks 5.4% Broadline Retail 4.9% Financial Services 4.4% Pharmaceuticals 4.3% Specialty Retail 3.6% Healthcare Equipment & Supplies 2.6%

Shareholder Report, Line Graph

Shareholder Report, Line Graph (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Nov. 30, 2024	Oct. 31, 2024	Sep. 30, 2024	Aug. 31, 2024	Jul. 31, 2024	Jun. 30, 2024	May 31, 2024	Apr. 30, 2024	Mar. 31, 2024	Feb. 29, 2024	Jan. 31, 2024	Dec. 31, 2023	Nov. 30, 2023	Oct. 31, 2023	Sep. 30, 2023	Aug. 31, 2023	Jul. 31, 2023	Jun. 30, 2023	May 31, 2023	Apr. 30, 2023	Mar. 31, 2023	Feb. 28, 2023	Jan. 31, 2023	Dec. 31, 2022	Nov. 30, 2022	Oct. 31, 2022	Sep. 30, 2022	Aug. 31, 2022	Jul. 31, 2022	Jun. 30, 2022	May 31, 2022	Apr. 30, 2022	Mar. 31, 2022	Feb. 28, 2022	Jan. 31, 2022	Dec. 31, 2021	Nov. 30, 2021	Oct. 31, 2021	Sep. 30, 2021	Aug. 31, 2021	Jul. 31, 2021	Jun. 30, 2021	May 31, 2021	Apr. 30, 2021	Mar. 31, 2021	Feb. 28, 2021	Jan. 31, 2021	Dec. 31, 2020	Nov. 30, 2020	Oct. 31, 2020	Sep. 30, 2020	Aug. 31, 2020	Jul. 31, 2020	Jun. 30, 2020	May 31, 2020	Apr. 30, 2020	Mar. 31, 2020	Feb. 29, 2020	Jan. 31, 2020	Dec. 31, 2019	Nov. 30, 2019	Oct. 31, 2019	Sep. 30, 2019	Aug. 31, 2019	Jul. 31, 2019	Jun. 30, 2019	May 31, 2019	Apr. 30, 2019	Mar. 31, 2019	Feb. 28, 2019	Jan. 31, 2019	Dec. 31, 2018	Nov. 30, 2018	Oct. 31, 2018	Sep. 30, 2018	Aug. 31, 2018	Jul. 31, 2018	Jun. 30, 2018	May 31, 2018	Apr. 30, 2018	Mar. 31, 2018	Feb. 28, 2018	Jan. 31, 2018	Dec. 31, 2017	Nov. 30, 2017	Oct. 31, 2017	Sep. 30, 2017	Aug. 31, 2017	Jul. 31, 2017	Jun. 30, 2017	May 31, 2017	Apr. 30, 2017	Mar. 31, 2017	Feb. 28, 2017	Jan. 31, 2017	Dec. 31, 2016	Nov. 30, 2016	Oct. 31, 2016	Sep. 30, 2016	Aug. 31, 2016	Jul. 31, 2016	Jun. 30, 2016	May 31, 2016	Apr. 30, 2016	Mar. 31, 2016	Feb. 29, 2016	Jan. 31, 2016	Dec. 31, 2015	Nov. 30, 2015	Oct. 31, 2015	Sep. 30, 2015	Aug. 31, 2015	Jul. 31, 2015	Jun. 30, 2015	May 31, 2015	Apr. 30, 2015	Mar. 31, 2015	Feb. 28, 2015	Jan. 31, 2015	Dec. 31, 2014
C000004445
Account Value [Line Items]
Line Graph and Table Measure Name	SSIMX
C000004449
Account Value [Line Items]
Line Graph and Table Measure Name	SPGSX
C000004440
Account Value [Line Items]
Line Graph and Table Measure Name	SSRSX
C000004450
Account Value [Line Items]
Line Graph and Table Measure Name	SSSPX
C000004438
Account Value [Line Items]
Line Graph and Table Measure Name	SSSEX
C000004439
Account Value [Line Items]
Line Graph and Table Measure Name	SSTIX
C000033161
Account Value [Line Items]
Line Graph and Table Measure Name	SSTTX
C000004441
Account Value [Line Items]
Line Graph and Table Measure Name	SSUSX
GE INDEX: BLOOMBERG US AGGREGATE BOND INDEX
Account Value [Line Items]
Line Graph and Table Measure Name	Bloomberg US Aggregate Bond Index
Account Value	$ 11,432	$ 11,622	$ 11,500	$ 11,793	$ 11,637	$ 11,472	$ 11,210	$ 11,105	$ 10,920	$ 11,203	$ 11,100	$ 11,260	$ 11,291	$ 10,874	$ 10,403	$ 10,570	$ 10,846	$ 10,915	$ 10,923	$ 10,962	$ 11,083	$ 11,016	$ 10,743	$ 11,028	$ 10,699	$ 10,748	$ 10,366	$ 10,502	$ 10,977	$ 11,296	$ 11,026	$ 11,202	$ 11,130	$ 11,569	$ 11,900	$ 12,034	$ 12,299	$ 12,331	$ 12,294	$ 12,298	$ 12,405	$ 12,429	$ 12,291	$ 12,206	$ 12,166	$ 12,071	$ 12,223	$ 12,402	$ 12,492	$ 12,475	$ 12,353	$ 12,409	$ 12,416	$ 12,517	$ 12,332	$ 12,255	$ 12,198	$ 11,985	$ 12,056	$ 11,843	$ 11,620	$ 11,628	$ 11,634	$ 11,599	$ 11,661	$ 11,366	$ 11,341	$ 11,201	$ 11,005	$ 11,002	$ 10,795	$ 10,801	$ 10,688	$ 10,495	$ 10,433	$ 10,516	$ 10,584	$ 10,516	$ 10,514	$ 10,527	$ 10,452	$ 10,531	$ 10,464	$ 10,564	$ 10,687	$ 10,638	$ 10,652	$ 10,645	$ 10,696	$ 10,601	$ 10,556	$ 10,566	$ 10,486	$ 10,405	$ 10,411	$ 10,341	$ 10,321	$ 10,307	$ 10,556	$ 10,638	$ 10,644	$ 10,656	$ 10,589	$ 10,402	$ 10,400	$ 10,360	$ 10,266	$ 10,193	$ 10,055	$ 10,088	$ 10,114	$ 10,113	$ 10,045	$ 10,059	$ 9,990	$ 10,100	$ 10,124	$ 10,161	$ 10,114	$ 10,210	$ 10,000
GE INDEX: S&P 500®
Account Value [Line Items]
Line Graph and Table Measure Name	®</sup> Index" id="sjs-B33">S&amp;P 500&lt;sup style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center;">®&lt;/sup> Index
Account Value	$ 34,254	35,090	33,145	33,448	32,749	31,973	31,589	30,494	29,054	30,291	29,347	27,859	27,399	26,208	24,015	24,531	25,759	26,176	25,361	23,789	23,686	23,322	22,496	23,059	21,696	23,022	21,804	20,170	22,217	23,161	21,206	23,114	23,071	25,276	24,371	25,123	26,494	25,357	25,534	23,863	25,026	24,288	23,724	23,183	23,022	21,856	20,939	20,377	20,585	19,823	17,867	18,355	19,080	17,801	16,850	16,522	15,771	13,979	15,949	17,379	17,386	16,877	16,286	15,940	15,648	15,899	15,674	14,642	15,636	15,027	14,741	14,282	13,223	14,535	14,245	15,290	15,203	14,724	14,195	14,108	13,777	13,724	14,082	14,621	13,829	13,677	13,270	12,967	12,705	12,666	12,411	12,334	12,163	12,039	12,025	11,566	11,351	11,131	10,733	10,933	10,931	10,915	10,527	10,500	10,315	10,275	9,622	9,635	10,138	10,301	10,270	9,471	9,712	10,335	10,123	10,323	10,192	10,095	10,257	9,700	10,000
GE INDEX: S&P 500®
Account Value [Line Items]
Line Graph and Table Measure Name	®</sup> Index" id="sjs-B37">S&amp;P 500&lt;sup style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center;">®&lt;/sup> Index
Account Value	$ 34,254	35,090	33,145	33,448	32,749	31,973	31,589	30,494	29,054	30,291	29,347	27,859	27,399	26,208	24,015	24,531	25,759	26,176	25,361	23,789	23,686	23,322	22,496	23,059	21,696	23,022	21,804	20,170	22,217	23,161	21,206	23,114	23,071	25,276	24,371	25,123	26,494	25,357	25,534	23,863	25,026	24,288	23,724	23,183	23,022	21,856	20,939	20,377	20,585	19,823	17,867	18,355	19,080	17,801	16,850	16,522	15,771	13,979	15,949	17,379	17,386	16,877	16,286	15,940	15,648	15,899	15,674	14,642	15,636	15,027	14,741	14,282	13,223	14,535	14,245	15,290	15,203	14,724	14,195	14,108	13,777	13,724	14,082	14,621	13,829	13,677	13,270	12,967	12,705	12,666	12,411	12,334	12,163	12,039	12,025	11,566	11,351	11,131	10,733	10,933	10,931	10,915	10,527	10,500	10,315	10,275	9,622	9,635	10,138	10,301	10,270	9,471	9,712	10,335	10,123	10,323	10,192	10,095	10,257	9,700	10,000
GE INDEX: S&P 500®
Account Value [Line Items]
Line Graph and Table Measure Name	®</sup> Index" id="sjs-B41">S&amp;P 500&lt;sup style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center;">®&lt;/sup> Index
Account Value	$ 34,254	35,090	33,145	33,448	32,749	31,973	31,589	30,494	29,054	30,291	29,347	27,859	27,399	26,208	24,015	24,531	25,759	26,176	25,361	23,789	23,686	23,322	22,496	23,059	21,696	23,022	21,804	20,170	22,217	23,161	21,206	23,114	23,071	25,276	24,371	25,123	26,494	25,357	25,534	23,863	25,026	24,288	23,724	23,183	23,022	21,856	20,939	20,377	20,585	19,823	17,867	18,355	19,080	17,801	16,850	16,522	15,771	13,979	15,949	17,379	17,386	16,877	16,286	15,940	15,648	15,899	15,674	14,642	15,636	15,027	14,741	14,282	13,223	14,535	14,245	15,290	15,203	14,724	14,195	14,108	13,777	13,724	14,082	14,621	13,829	13,677	13,270	12,967	12,705	12,666	12,411	12,334	12,163	12,039	12,025	11,566	11,351	11,131	10,733	10,933	10,931	10,915	10,527	10,500	10,315	10,275	9,622	9,635	10,138	10,301	10,270	9,471	9,712	10,335	10,123	10,323	10,192	10,095	10,257	9,700	10,000
GE INDEX: S&P 500®
Account Value [Line Items]
Line Graph and Table Measure Name	®</sup> Index" id="sjs-B45">S&amp;P 500&lt;sup style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center;">®&lt;/sup> Index
Account Value	$ 34,254	35,090	33,145	33,448	32,749	31,973	31,589	30,494	29,054	30,291	29,347	27,859	27,399	26,208	24,015	24,531	25,759	26,176	25,361	23,789	23,686	23,322	22,496	23,059	21,696	23,022	21,804	20,170	22,217	23,161	21,206	23,114	23,071	25,276	24,371	25,123	26,494	25,357	25,534	23,863	25,026	24,288	23,724	23,183	23,022	21,856	20,939	20,377	20,585	19,823	17,867	18,355	19,080	17,801	16,850	16,522	15,771	13,979	15,949	17,379	17,386	16,877	16,286	15,940	15,648	15,899	15,674	14,642	15,636	15,027	14,741	14,282	13,223	14,535	14,245	15,290	15,203	14,724	14,195	14,108	13,777	13,724	14,082	14,621	13,829	13,677	13,270	12,967	12,705	12,666	12,411	12,334	12,163	12,039	12,025	11,566	11,351	11,131	10,733	10,933	10,931	10,915	10,527	10,500	10,315	10,275	9,622	9,635	10,138	10,301	10,270	9,471	9,712	10,335	10,123	10,323	10,192	10,095	10,257	9,700	10,000
GE INDEX: S&P 500®
Account Value [Line Items]
Line Graph and Table Measure Name	®</sup> Index" id="sjs-B49">S&amp;P 500&lt;sup style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center;">®&lt;/sup> Index
Account Value	$ 34,254	35,090	33,145	33,448	32,749	31,973	31,589	30,494	29,054	30,291	29,347	27,859	27,399	26,208	24,015	24,531	25,759	26,176	25,361	23,789	23,686	23,322	22,496	23,059	21,696	23,022	21,804	20,170	22,217	23,161	21,206	23,114	23,071	25,276	24,371	25,123	26,494	25,357	25,534	23,863	25,026	24,288	23,724	23,183	23,022	21,856	20,939	20,377	20,585	19,823	17,867	18,355	19,080	17,801	16,850	16,522	15,771	13,979	15,949	17,379	17,386	16,877	16,286	15,940	15,648	15,899	15,674	14,642	15,636	15,027	14,741	14,282	13,223	14,535	14,245	15,290	15,203	14,724	14,195	14,108	13,777	13,724	14,082	14,621	13,829	13,677	13,270	12,967	12,705	12,666	12,411	12,334	12,163	12,039	12,025	11,566	11,351	11,131	10,733	10,933	10,931	10,915	10,527	10,500	10,315	10,275	9,622	9,635	10,138	10,301	10,270	9,471	9,712	10,335	10,123	10,323	10,192	10,095	10,257	9,700	10,000
GE INDEX: S&P 500®
Account Value [Line Items]
Line Graph and Table Measure Name	®</sup> Index" id="sjs-B53">S&amp;P 500&lt;sup style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center;">®&lt;/sup> Index
Account Value	$ 34,254	35,090	33,145	33,448	32,749	31,973	31,589	30,494	29,054	30,291	29,347	27,859	27,399	26,208	24,015	24,531	25,759	26,176	25,361	23,789	23,686	23,322	22,496	23,059	21,696	23,022	21,804	20,170	22,217	23,161	21,206	23,114	23,071	25,276	24,371	25,123	26,494	25,357	25,534	23,863	25,026	24,288	23,724	23,183	23,022	21,856	20,939	20,377	20,585	19,823	17,867	18,355	19,080	17,801	16,850	16,522	15,771	13,979	15,949	17,379	17,386	16,877	16,286	15,940	15,648	15,899	15,674	14,642	15,636	15,027	14,741	14,282	13,223	14,535	14,245	15,290	15,203	14,724	14,195	14,108	13,777	13,724	14,082	14,621	13,829	13,677	13,270	12,967	12,705	12,666	12,411	12,334	12,163	12,039	12,025	11,566	11,351	11,131	10,733	10,933	10,931	10,915	10,527	10,500	10,315	10,275	9,622	9,635	10,138	10,301	10,270	9,471	9,712	10,335	10,123	10,323	10,192	10,095	10,257	9,700	10,000
GE INDEX: RUSSELL 1000® GROWTH INDEX
Account Value [Line Items]
Line Graph and Table Measure Name	®</sup> Growth Index" id="sjs-B57">Russell 1000&lt;sup style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center;">®&lt;/sup> Growth Index
Account Value	$ 47,152	46,740	43,893	44,038	42,825	41,951	42,677	39,981	37,723	39,394	38,713	36,240	35,358	33,859	30,531	30,972	32,753	33,050	31,972	29,926	28,621	28,342	26,528	26,847	24,782	26,836	25,667	24,249	26,861	28,173	25,154	27,318	27,968	31,809	30,612	31,970	34,971	34,247	34,039	31,326	33,184	31,988	30,968	29,140	29,548	27,666	27,199	27,205	27,408	26,203	23,769	24,604	25,819	23,404	21,732	20,825	19,515	17,000	18,854	20,232	19,790	19,210	18,394	17,890	17,888	18,026	17,628	16,495	17,607	16,846	16,380	15,814	14,510	15,875	15,708	17,251	17,155	16,265	15,801	15,651	14,994	14,941	15,363	15,776	14,733	14,619	14,188	13,659	13,483	13,241	12,898	12,932	12,604	12,322	12,182	11,696	11,314	11,176	10,938	11,201	11,160	11,216	10,711	10,753	10,548	10,645	9,973	9,977	10,567	10,724	10,694	9,846	10,096	10,749	10,396	10,583	10,436	10,384	10,503	9,847	10,000
GE INDEX: FTSE NAREIT EQUITY REITS TR
Account Value [Line Items]
Line Graph and Table Measure Name	FTSE NAREIT Equity REITs Index
Account Value	$ 17,454	18,846	18,070	18,610	18,120	17,029	16,031	15,581	14,897	16,021	15,698	15,386	16,052	14,604	13,209	13,812	14,820	15,296	14,872	14,143	14,614	14,493	14,871	15,621	14,114	14,879	14,068	13,411	15,271	16,241	14,892	16,084	17,154	17,942	16,839	17,383	18,661	17,147	17,263	16,044	16,959	16,653	15,889	15,484	15,327	14,184	13,565	13,042	13,028	12,614	11,372	11,677	12,072	11,978	11,512	11,171	11,149	10,295	13,185	14,332	14,161	14,246	14,464	14,269	13,863	13,407	13,238	13,073	13,044	13,075	12,651	12,560	11,239	12,247	11,693	12,050	12,364	11,999	11,904	11,406	10,973	10,818	10,421	11,292	11,784	11,809	11,497	11,609	11,612	11,642	11,501	11,255	11,343	11,329	11,594	11,212	11,199	10,697	10,880	11,532	11,739	12,186	11,700	10,937	10,678	10,939	9,932	9,974	10,320	10,133	10,186	9,621	9,348	9,965	9,433	9,888	9,900	10,475	10,299	10,671	10,000
GE INDEX: RUSSELL 2000® INDEX
Account Value [Line Items]
Line Graph and Table Measure Name	®</sup> Index" id="sjs-B65">Russell 2000&lt;sup style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center;">®&lt;/sup> Index
Account Value	$ 21,223	23,134	20,847	21,152	21,006	21,324	19,357	19,538	18,605	20,013	19,322	18,288	19,028	16,956	15,549	16,687	17,731	18,664	17,589	16,266	16,418	16,718	17,557	17,859	16,273	17,402	17,005	15,319	16,942	17,296	15,661	17,065	17,039	18,914	18,681	18,484	20,453	20,006	20,876	20,024	20,632	20,181	20,937	20,539	20,497	20,075	19,876	18,709	17,813	16,395	13,843	13,559	14,028	13,280	12,922	12,481	11,718	10,303	13,163	14,373	14,849	14,433	13,862	13,507	13,231	13,918	13,839	12,925	14,015	13,555	13,845	13,160	11,830	13,424	13,214	14,824	15,190	14,562	14,312	14,211	13,397	13,283	13,113	13,641	13,294	13,348	12,974	12,864	12,108	12,264	12,174	11,767	12,012	11,881	11,866	11,641	11,595	11,279	10,148	10,654	10,537	10,354	9,770	9,777	9,561	9,413	8,718	8,718	9,559	10,064	9,747	9,227	9,703	10,354	10,475	10,398	10,165	10,432	10,253	9,678	10,000
GE INDEX: BLOOMBERG US AGGREGATE BOND INDEX
Account Value [Line Items]
Line Graph and Table Measure Name	Bloomberg US Aggregate Bond Index
Account Value	$ 11,432	11,622	11,500	11,793	11,637	11,472	11,210	11,105	10,920	11,203	11,100	11,260	11,291	10,874	10,403	10,570	10,846	10,915	10,923	10,962	11,083	11,016	10,743	11,028	10,699	10,748	10,366	10,502	10,977	11,296	11,026	11,202	11,130	11,569	11,900	12,034	12,299	12,331	12,294	12,298	12,405	12,429	12,291	12,206	12,166	12,071	12,223	12,402	12,492	12,475	12,353	12,409	12,416	12,517	12,332	12,255	12,198	11,985	12,056	11,843	11,620	11,628	11,634	11,599	11,661	11,366	11,341	11,201	11,005	11,002	10,795	10,801	10,688	10,495	10,433	10,516	10,584	10,516	10,514	10,527	10,452	10,531	10,464	10,564	10,687	10,638	10,652	10,645	10,696	10,601	10,556	10,566	10,486	10,405	10,411	10,341	10,321	10,307	10,556	10,638	10,644	10,656	10,589	10,402	10,400	10,360	10,266	10,193	10,055	10,088	10,114	10,113	10,045	10,059	9,990	10,100	10,124	10,161	10,114	10,210	10,000
GE INDEX: MSCI AC WORLD INDEX EX USA NET (USD)
Account Value [Line Items]
Line Graph and Table Measure Name	MSCI All Country World Index ex-USA
Account Value	$ 15,985	16,302	16,451	17,300	16,846	16,380	16,009	16,024	15,572	15,857	15,376	14,996	15,147	14,422	13,231	13,801	14,251	14,925	14,342	13,726	14,244	14,001	13,667	14,164	13,101	13,200	11,806	11,464	12,736	13,160	12,724	13,922	13,822	14,748	14,725	15,022	15,597	14,978	15,684	15,319	15,825	15,530	15,790	15,893	15,411	14,971	14,784	14,497	14,465	13,724	12,096	12,362	12,674	12,153	11,635	11,132	10,779	10,020	11,716	12,722	13,073	12,530	12,421	12,002	11,701	12,074	12,222	11,527	12,181	11,868	11,797	11,571	10,758	11,269	11,163	12,151	12,096	12,355	12,066	12,297	12,588	12,390	12,613	13,237	12,538	12,264	12,165	11,941	11,723	11,662	11,248	11,213	10,860	10,633	10,370	10,207	9,858	9,612	9,840	9,983	9,862	9,800	9,338	9,483	9,646	9,398	8,692	8,792	9,434	9,615	9,818	9,137	9,582	10,375	10,403	10,702	10,872	10,349	10,519	9,985	10,000
GE INDEX: BLOOMBERG US AGGREGATE BOND INDEX
Account Value [Line Items]
Line Graph and Table Measure Name	Bloomberg US Aggregate Bond Index
Account Value	$ 11,432	11,622	11,500	11,793	11,637	11,472	11,210	11,105	10,920	11,203	11,100	11,260	11,291	10,874	10,403	10,570	10,846	10,915	10,923	10,962	11,083	11,016	10,743	11,028	10,699	10,748	10,366	10,502	10,977	11,296	11,026	11,202	11,130	11,569	11,900	12,034	12,299	12,331	12,294	12,298	12,405	12,429	12,291	12,206	12,166	12,071	12,223	12,402	12,492	12,475	12,353	12,409	12,416	12,517	12,332	12,255	12,198	11,985	12,056	11,843	11,620	11,628	11,634	11,599	11,661	11,366	11,341	11,201	11,005	11,002	10,795	10,801	10,688	10,495	10,433	10,516	10,584	10,516	10,514	10,527	10,452	10,531	10,464	10,564	10,687	10,638	10,652	10,645	10,696	10,601	10,556	10,566	10,486	10,405	10,411	10,341	10,321	10,307	10,556	10,638	10,644	10,656	10,589	10,402	10,400	10,360	10,266	10,193	10,055	10,088	10,114	10,113	10,045	10,059	9,990	10,100	10,124	10,161	10,114	10,210	10,000
GE INDEX: MSCI AC WORLD INDEX EX USA NET (USD)
Account Value [Line Items]
Line Graph and Table Measure Name	MSCI All Country World Index ex-USA
Account Value	$ 15,985	16,302	16,451	17,300	16,846	16,380	16,009	16,024	15,572	15,857	15,376	14,996	15,147	14,422	13,231	13,801	14,251	14,925	14,342	13,726	14,244	14,001	13,667	14,164	13,101	13,200	11,806	11,464	12,736	13,160	12,724	13,922	13,822	14,748	14,725	15,022	15,597	14,978	15,684	15,319	15,825	15,530	15,790	15,893	15,411	14,971	14,784	14,497	14,465	13,724	12,096	12,362	12,674	12,153	11,635	11,132	10,779	10,020	11,716	12,722	13,073	12,530	12,421	12,002	11,701	12,074	12,222	11,527	12,181	11,868	11,797	11,571	10,758	11,269	11,163	12,151	12,096	12,355	12,066	12,297	12,588	12,390	12,613	13,237	12,538	12,264	12,165	11,941	11,723	11,662	11,248	11,213	10,860	10,633	10,370	10,207	9,858	9,612	9,840	9,983	9,862	9,800	9,338	9,483	9,646	9,398	8,692	8,792	9,434	9,615	9,818	9,137	9,582	10,375	10,403	10,702	10,872	10,349	10,519	9,985	10,000
GE INDEX: S&P 500®
Account Value [Line Items]
Line Graph and Table Measure Name	®</sup> Index" id="sjs-B85">S&amp;P 500&lt;sup style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center;">®&lt;/sup> Index
Account Value	$ 34,254	$ 35,090	$ 33,145	$ 33,448	$ 32,749	$ 31,973	$ 31,589	$ 30,494	$ 29,054	$ 30,291	$ 29,347	$ 27,859	$ 27,399	$ 26,208	$ 24,015	$ 24,531	$ 25,759	$ 26,176	$ 25,361	$ 23,789	$ 23,686	$ 23,322	$ 22,496	$ 23,059	$ 21,696	$ 23,022	$ 21,804	$ 20,170	$ 22,217	$ 23,161	$ 21,206	$ 23,114	$ 23,071	$ 25,276	$ 24,371	$ 25,123	$ 26,494	$ 25,357	$ 25,534	$ 23,863	$ 25,026	$ 24,288	$ 23,724	$ 23,183	$ 23,022	$ 21,856	$ 20,939	$ 20,377	$ 20,585	$ 19,823	$ 17,867	$ 18,355	$ 19,080	$ 17,801	$ 16,850	$ 16,522	$ 15,771	$ 13,979	$ 15,949	$ 17,379	$ 17,386	$ 16,877	$ 16,286	$ 15,940	$ 15,648	$ 15,899	$ 15,674	$ 14,642	$ 15,636	$ 15,027	$ 14,741	$ 14,282	$ 13,223	$ 14,535	$ 14,245	$ 15,290	$ 15,203	$ 14,724	$ 14,195	$ 14,108	$ 13,777	$ 13,724	$ 14,082	$ 14,621	$ 13,829	$ 13,677	$ 13,270	$ 12,967	$ 12,705	$ 12,666	$ 12,411	$ 12,334	$ 12,163	$ 12,039	$ 12,025	$ 11,566	$ 11,351	$ 11,131	$ 10,733	$ 10,933	$ 10,931	$ 10,915	$ 10,527	$ 10,500	$ 10,315	$ 10,275	$ 9,622	$ 9,635	$ 10,138	$ 10,301	$ 10,270	$ 9,471	$ 9,712	$ 10,335	$ 10,123	$ 10,323	$ 10,192	$ 10,095	$ 10,257	$ 9,700	$ 10,000

Shareholder Report, Average Ann

Shareholder Report, Average Annual Return (Details)	12 Months Ended	60 Months Ended	120 Months Ended
	Dec. 31, 2024	Dec. 31, 2024	Dec. 31, 2024
C000004445
Average Annual Return [Line Items]
Line Graph and Table Measure Name	SSIMX
C000004449
Average Annual Return [Line Items]
Line Graph and Table Measure Name	SPGSX
C000004440
Average Annual Return [Line Items]
Line Graph and Table Measure Name	SSRSX
C000004450
Average Annual Return [Line Items]
Line Graph and Table Measure Name	SSSPX
C000004438
Average Annual Return [Line Items]
Line Graph and Table Measure Name	SSSEX
C000004439
Average Annual Return [Line Items]
Line Graph and Table Measure Name	SSTIX
C000033161
Average Annual Return [Line Items]
Line Graph and Table Measure Name	SSTTX
C000004441
Average Annual Return [Line Items]
Line Graph and Table Measure Name	SSUSX
Without Sales Load [Member] | C000004445
Average Annual Return [Line Items]
Average Annual Return, Percent	(0.82%)	(1.35%)	0.58%
Without Sales Load [Member] | C000004449
Average Annual Return [Line Items]
Average Annual Return, Percent	31.06%	17.37%	15%
Without Sales Load [Member] | C000004440
Average Annual Return [Line Items]
Average Annual Return, Percent	10.46%	4.81%	6.04%
Without Sales Load [Member] | C000004450
Average Annual Return [Line Items]
Average Annual Return, Percent	24.63%	14.17%	12.75%
Without Sales Load [Member] | C000004438
Average Annual Return [Line Items]
Average Annual Return, Percent	10.32%	7.91%	8.34%
Without Sales Load [Member] | C000004439
Average Annual Return [Line Items]
Average Annual Return, Percent	11.31%	5.32%	5.50%
Without Sales Load [Member] | C000033161
Average Annual Return [Line Items]
Average Annual Return, Percent	11.06%	5.06%	5.24%
Without Sales Load [Member] | C000004441
Average Annual Return [Line Items]
Average Annual Return, Percent	24.55%	14.73%	12.48%
GE INDEX: BLOOMBERG US AGGREGATE BOND INDEX
Average Annual Return [Line Items]
Line Graph and Table Measure Name	Bloomberg US Aggregate Bond Index
Average Annual Return, Percent	1.25%	(0.33%)	1.35%
GE INDEX: S&P 500®
Average Annual Return [Line Items]
Line Graph and Table Measure Name	®</sup> Index" id="sjs-B57">S&amp;P 500&lt;sup style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center;">®&lt;/sup> Index
Average Annual Return, Percent	25.02%	14.53%	13.10%
GE INDEX: S&P 500®
Average Annual Return [Line Items]
Line Graph and Table Measure Name	®</sup> Index" id="sjs-B61">S&amp;P 500&lt;sup style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center;">®&lt;/sup> Index
Average Annual Return, Percent	25.02%	14.53%	13.10%
GE INDEX: S&P 500®
Average Annual Return [Line Items]
Line Graph and Table Measure Name	®</sup> Index" id="sjs-B65">S&amp;P 500&lt;sup style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center;">®&lt;/sup> Index
Average Annual Return, Percent	25.02%	14.53%	13.10%
GE INDEX: S&P 500®
Average Annual Return [Line Items]
Line Graph and Table Measure Name	®</sup> Index" id="sjs-B69">S&amp;P 500&lt;sup style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center;">®&lt;/sup> Index
Average Annual Return, Percent	25.02%	14.53%	13.10%
GE INDEX: S&P 500®
Average Annual Return [Line Items]
Line Graph and Table Measure Name	®</sup> Index" id="sjs-B73">S&amp;P 500&lt;sup style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center;">®&lt;/sup> Index
Average Annual Return, Percent	25.02%	14.53%	13.10%
GE INDEX: S&P 500®
Average Annual Return [Line Items]
Line Graph and Table Measure Name	®</sup> Index" id="sjs-B77">S&amp;P 500&lt;sup style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center;">®&lt;/sup> Index
Average Annual Return, Percent	25.02%	14.53%	13.10%
GE INDEX: RUSSELL 1000® GROWTH INDEX
Average Annual Return [Line Items]
Line Graph and Table Measure Name	®</sup> Growth Index" id="sjs-B81">Russell 1000&lt;sup style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center;">®&lt;/sup> Growth Index
Average Annual Return, Percent	33.36%	18.96%	16.78%
GE INDEX: FTSE NAREIT EQUITY REITS TR
Average Annual Return [Line Items]
Line Graph and Table Measure Name	FTSE NAREIT Equity REITs Index
Average Annual Return, Percent	8.73%	4.27%	5.73%
GE INDEX: RUSSELL 2000® INDEX
Average Annual Return [Line Items]
Line Graph and Table Measure Name	®</sup> Index" id="sjs-B89">Russell 2000&lt;sup style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center;">®&lt;/sup> Index
Average Annual Return, Percent	11.54%	7.40%	7.82%
GE INDEX: BLOOMBERG US AGGREGATE BOND INDEX
Average Annual Return [Line Items]
Line Graph and Table Measure Name	Bloomberg US Aggregate Bond Index
Average Annual Return, Percent	1.25%	(0.33%)	1.35%
GE INDEX: MSCI AC WORLD INDEX EX USA NET (USD)
Average Annual Return [Line Items]
Line Graph and Table Measure Name	MSCI All Country World Index ex-USA
Average Annual Return, Percent	5.53%	4.10%	4.80%
GE INDEX: BLOOMBERG US AGGREGATE BOND INDEX
Average Annual Return [Line Items]
Line Graph and Table Measure Name	Bloomberg US Aggregate Bond Index
Average Annual Return, Percent	1.25%	(0.33%)	1.35%
GE INDEX: MSCI AC WORLD INDEX EX USA NET (USD)
Average Annual Return [Line Items]
Line Graph and Table Measure Name	MSCI All Country World Index ex-USA
Average Annual Return, Percent	5.53%	4.10%	4.80%
GE INDEX: S&P 500®
Average Annual Return [Line Items]
Line Graph and Table Measure Name	®</sup> Index" id="sjs-B109">S&amp;P 500&lt;sup style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center;">®&lt;/sup> Index
Average Annual Return, Percent	25.02%	14.53%	13.10%

Shareholder Report, Holdings (D

Shareholder Report, Holdings (Details)	Dec. 31, 2024
C000004445 | U.S. Treasury NotesFR_91282CHT1
Holdings [Line Items]
Percent of Net Asset Value	8.90%
C000004445 | U.S. Treasury NotesFR_91282CFF3
Holdings [Line Items]
Percent of Net Asset Value	5.40%
C000004445 | Uniform Mortgage-Backed Security, TBAFR_01F022618
Holdings [Line Items]
Percent of Net Asset Value	4.70%
C000004445 | Uniform Mortgage-Backed Security, TBAFR_01F060618
Holdings [Line Items]
Percent of Net Asset Value	4.70%
C000004445 | Uniform Mortgage-Backed Security, TBAFR_01F062614
Holdings [Line Items]
Percent of Net Asset Value	2.90%
C000004445 | U.S. Treasury NotesFR_91282CLF6
Holdings [Line Items]
Percent of Net Asset Value	2.70%
C000004445 | Uniform Mortgage-Backed Security, TBAFR_01F020612
Holdings [Line Items]
Percent of Net Asset Value	2.60%
C000004445 | U.S. Treasury Inflation-Indexed NotesFR_91282CLE9
Holdings [Line Items]
Percent of Net Asset Value	2.60%
C000004445 | U.S. Treasury BondsFR_912810SD1
Holdings [Line Items]
Percent of Net Asset Value	2.20%
C000004445 | Federal National Mortgage AssociationFR_3140XAQS4
Holdings [Line Items]
Percent of Net Asset Value	1.90%
C000004445 | AssetU.S. Treasuries
Holdings [Line Items]
Percent of Net Asset Value	31.80%
C000004445 | AssetAgency Mortgage Backed
Holdings [Line Items]
Percent of Net Asset Value	31.30%
C000004445 | AssetCorporate Notes
Holdings [Line Items]
Percent of Net Asset Value	27.20%
C000004445 | AssetShort-Term Investments
Holdings [Line Items]
Percent of Net Asset Value	19.90%
C000004445 | AssetNon-Agency Collateralized Mortgage Obligations
Holdings [Line Items]
Percent of Net Asset Value	6.20%
C000004445 | AssetAgency Collateralized Mortgage Obligations
Holdings [Line Items]
Percent of Net Asset Value	1.20%
C000004445 | AssetSovereign Bonds
Holdings [Line Items]
Percent of Net Asset Value	0.40%
C000004445 | AssetMunicipal Bonds and Notes
Holdings [Line Items]
Percent of Net Asset Value	0.20%
C000004449 | NVIDIA Corp.FR_67066G104
Holdings [Line Items]
Percent of Net Asset Value	12.60%
C000004449 | Microsoft Corp.FR_594918104
Holdings [Line Items]
Percent of Net Asset Value	12.20%
C000004449 | Amazon.com, Inc.FR_023135106
Holdings [Line Items]
Percent of Net Asset Value	8.40%
C000004449 | Meta Platforms, Inc.FR_30303M102
Holdings [Line Items]
Percent of Net Asset Value	6%
C000004449 | Apple, Inc.FR_037833100
Holdings [Line Items]
Percent of Net Asset Value	4.80%
C000004449 | Broadcom, Inc.FR_11135F101
Holdings [Line Items]
Percent of Net Asset Value	4.70%
C000004449 | Alphabet, Inc.FR_02079K107
Holdings [Line Items]
Percent of Net Asset Value	4.50%
C000004449 | Alphabet, Inc.FR_02079K305
Holdings [Line Items]
Percent of Net Asset Value	4.10%
C000004449 | The Technology Select Sector SPDR FundFR_81369Y803
Holdings [Line Items]
Percent of Net Asset Value	3.90%
C000004449 | Visa, Inc.FR_92826C839
Holdings [Line Items]
Percent of Net Asset Value	2.80%
C000004449 | IndustrySemiconductors & Semiconductor Equipment
Holdings [Line Items]
Percent of Net Asset Value	20.40%
C000004449 | IndustrySoftware
Holdings [Line Items]
Percent of Net Asset Value	19.90%
C000004449 | IndustryInteractive Media & Services
Holdings [Line Items]
Percent of Net Asset Value	14.60%
C000004449 | IndustryBroadline Retail
Holdings [Line Items]
Percent of Net Asset Value	8.40%
C000004449 | IndustryFinancial Services
Holdings [Line Items]
Percent of Net Asset Value	5.20%
C000004449 | IndustryTechnology Hardware, Storage & Peripherals
Holdings [Line Items]
Percent of Net Asset Value	4.80%
C000004449 | IndustrySpecialty Retail
Holdings [Line Items]
Percent of Net Asset Value	4.50%
C000004449 | IndustryExchange Traded & Mutual Funds
Holdings [Line Items]
Percent of Net Asset Value	3.90%
C000004449 | IndustryMachinery
Holdings [Line Items]
Percent of Net Asset Value	1.50%
C000004449 | IndustryTrading Companies & Distributors
Holdings [Line Items]
Percent of Net Asset Value	1.50%
C000004440 | Equinix, Inc.FR_29444U700
Holdings [Line Items]
Percent of Net Asset Value	8.70%
C000004440 | Prologis, Inc.FR_74340W103
Holdings [Line Items]
Percent of Net Asset Value	6.90%
C000004440 | Welltower, Inc.FR_95040Q104
Holdings [Line Items]
Percent of Net Asset Value	6.30%
C000004440 | Digital Realty Trust, Inc.FR_253868103
Holdings [Line Items]
Percent of Net Asset Value	4.80%
C000004440 | UDR, Inc.FR_902653104
Holdings [Line Items]
Percent of Net Asset Value	4.10%
C000004440 | Invitation Homes, Inc.FR_46187W107
Holdings [Line Items]
Percent of Net Asset Value	4.10%
C000004440 | Ventas, Inc.FR_92276F100
Holdings [Line Items]
Percent of Net Asset Value	3.90%
C000004440 | Extra Space Storage, Inc.FR_30225T102
Holdings [Line Items]
Percent of Net Asset Value	3.80%
C000004440 | Equity ResidentialFR_29476L107
Holdings [Line Items]
Percent of Net Asset Value	3.60%
C000004440 | Simon Property Group, Inc.FR_828806109
Holdings [Line Items]
Percent of Net Asset Value	3.50%
C000004440 | IndustrySpecialized REITs
Holdings [Line Items]
Percent of Net Asset Value	27.80%
C000004440 | IndustryRetail REITs
Holdings [Line Items]
Percent of Net Asset Value	17.10%
C000004440 | IndustryResidential REITs
Holdings [Line Items]
Percent of Net Asset Value	17%
C000004440 | IndustryHealth Care REITs
Holdings [Line Items]
Percent of Net Asset Value	16.20%
C000004440 | IndustryIndustrial REITs
Holdings [Line Items]
Percent of Net Asset Value	12.10%
C000004440 | IndustryOffice REITs
Holdings [Line Items]
Percent of Net Asset Value	5.20%
C000004440 | IndustryHotel & Resort REITs
Holdings [Line Items]
Percent of Net Asset Value	3.20%
C000004440 | IndustryDiversified REITs
Holdings [Line Items]
Percent of Net Asset Value	0.70%
C000004450 | NVIDIA Corp.FR_67066G104
Holdings [Line Items]
Percent of Net Asset Value	6.60%
C000004450 | Microsoft Corp.FR_594918104
Holdings [Line Items]
Percent of Net Asset Value	6.30%
C000004450 | Amazon.com, Inc.FR_023135106
Holdings [Line Items]
Percent of Net Asset Value	4.10%
C000004450 | Meta Platforms, Inc.FR_30303M102
Holdings [Line Items]
Percent of Net Asset Value	2.60%
C000004450 | Apple, Inc.FR_037833100
Holdings [Line Items]
Percent of Net Asset Value	7.60%
C000004450 | Broadcom, Inc.FR_11135F101
Holdings [Line Items]
Percent of Net Asset Value	2.20%
C000004450 | Alphabet, Inc.FR_02079K107
Holdings [Line Items]
Percent of Net Asset Value	1.80%
C000004450 | Alphabet, Inc.FR_02079K305
Holdings [Line Items]
Percent of Net Asset Value	2.20%
C000004450 | Tesla, Inc.FR_88160R101
Holdings [Line Items]
Percent of Net Asset Value	2.30%
C000004450 | Berkshire Hathaway, Inc.FR_084670702
Holdings [Line Items]
Percent of Net Asset Value	1.70%
C000004450 | IndustrySemiconductors & Semiconductor Equipment
Holdings [Line Items]
Percent of Net Asset Value	11.50%
C000004450 | IndustrySoftware
Holdings [Line Items]
Percent of Net Asset Value	10.40%
C000004450 | IndustryInteractive Media & Services
Holdings [Line Items]
Percent of Net Asset Value	6.60%
C000004450 | IndustryBroadline Retail
Holdings [Line Items]
Percent of Net Asset Value	4.20%
C000004450 | IndustryFinancial Services
Holdings [Line Items]
Percent of Net Asset Value	4.40%
C000004450 | IndustryTechnology Hardware, Storage & Peripherals
Holdings [Line Items]
Percent of Net Asset Value	7.90%
C000004450 | IndustryBanks
Holdings [Line Items]
Percent of Net Asset Value	3.40%
C000004450 | IndustryCapital Markets
Holdings [Line Items]
Percent of Net Asset Value	3.10%
C000004450 | IndustryPharmaceuticals
Holdings [Line Items]
Percent of Net Asset Value	3.10%
C000004450 | IndustryOil, Gas & Consumable Fuels
Holdings [Line Items]
Percent of Net Asset Value	2.90%
C000004438 | Belden, Inc.FR_077454106
Holdings [Line Items]
Percent of Net Asset Value	1.30%
C000004438 | Enerpac Tool Group Corp.FR_292765104
Holdings [Line Items]
Percent of Net Asset Value	1.30%
C000004438 | Brink's Co.FR_109696104
Holdings [Line Items]
Percent of Net Asset Value	1.20%
C000004438 | Darling Ingredients, Inc.FR_237266101
Holdings [Line Items]
Percent of Net Asset Value	1.10%
C000004438 | Boot Barn Holdings, Inc.FR_099406100
Holdings [Line Items]
Percent of Net Asset Value	1.10%
C000004438 | U.S. Physical Therapy, Inc.FR_90337L108
Holdings [Line Items]
Percent of Net Asset Value	1.10%
C000004438 | Louisiana-Pacific Corp.FR_546347105
Holdings [Line Items]
Percent of Net Asset Value	1.10%
C000004438 | Cullen/Frost Bankers, Inc.FR_229899109
Holdings [Line Items]
Percent of Net Asset Value	1.10%
C000004438 | Repligen Corp.FR_759916109
Holdings [Line Items]
Percent of Net Asset Value	1%
C000004438 | RB Global, Inc.FR_74935Q107
Holdings [Line Items]
Percent of Net Asset Value	0.90%
C000004438 | IndustrySoftware
Holdings [Line Items]
Percent of Net Asset Value	7.60%
C000004438 | IndustrySpecialty Retail
Holdings [Line Items]
Percent of Net Asset Value	3.70%
C000004438 | IndustryMachinery
Holdings [Line Items]
Percent of Net Asset Value	8.60%
C000004438 | IndustryBanks
Holdings [Line Items]
Percent of Net Asset Value	9.30%
C000004438 | IndustryHealthcare Equipment & Supplies
Holdings [Line Items]
Percent of Net Asset Value	4.90%
C000004438 | IndustryCommercial Services & Supplies
Holdings [Line Items]
Percent of Net Asset Value	4.30%
C000004438 | IndustryChemicals
Holdings [Line Items]
Percent of Net Asset Value	3.40%
C000004438 | IndustryFood Products
Holdings [Line Items]
Percent of Net Asset Value	3.20%
C000004438 | IndustryInsurance
Holdings [Line Items]
Percent of Net Asset Value	3.20%
C000004438 | IndustryElectronic Equipment, Instruments & Components
Holdings [Line Items]
Percent of Net Asset Value	3.10%
C000004439 | NVIDIA Corp.FR_67066G104
Holdings [Line Items]
Percent of Net Asset Value	1.90%
C000004439 | Microsoft Corp.FR_594918104
Holdings [Line Items]
Percent of Net Asset Value	1.90%
C000004439 | Amazon.com, Inc.FR_023135106
Holdings [Line Items]
Percent of Net Asset Value	1.30%
C000004439 | Meta Platforms, Inc.FR_30303M102
Holdings [Line Items]
Percent of Net Asset Value	0.80%
C000004439 | Apple, Inc.FR_037833100
Holdings [Line Items]
Percent of Net Asset Value	2.20%
C000004439 | Alphabet, Inc.FR_02079K305
Holdings [Line Items]
Percent of Net Asset Value	0.70%
C000004439 | Tesla, Inc.FR_88160R101
Holdings [Line Items]
Percent of Net Asset Value	0.70%
C000004439 | SPDR Portfolio Aggregate Bond ETFFR_78464A649
Holdings [Line Items]
Percent of Net Asset Value	15.70%
C000004439 | SPDR Bloomberg High Yield Bond ETFFR_78468R622
Holdings [Line Items]
Percent of Net Asset Value	9.70%
C000004439 | Taiwan Semiconductor Manufacturing Co. Ltd.FR_688910900
Holdings [Line Items]
Percent of Net Asset Value	1.10%
C000004439 | AssetShort-Term Investments
Holdings [Line Items]
Percent of Net Asset Value	8.20%
C000004439 | AssetCommon Stocks
Holdings [Line Items]
Percent of Net Asset Value	60.90%
C000004439 | AssetMutual Funds and Exchange Traded Products
Holdings [Line Items]
Percent of Net Asset Value	25.50%
C000004439 | AssetU.S. Treasury Obligations
Holdings [Line Items]
Percent of Net Asset Value	5%
C000004439 | AssetPreferred Stock
Holdings [Line Items]
Percent of Net Asset Value	0.20%
C000033161 | NVIDIA Corp.FR_67066G104
Holdings [Line Items]
Percent of Net Asset Value	1.90%
C000033161 | Microsoft Corp.FR_594918104
Holdings [Line Items]
Percent of Net Asset Value	1.90%
C000033161 | Amazon.com, Inc.FR_023135106
Holdings [Line Items]
Percent of Net Asset Value	1.30%
C000033161 | Meta Platforms, Inc.FR_30303M102
Holdings [Line Items]
Percent of Net Asset Value	0.80%
C000033161 | Apple, Inc.FR_037833100
Holdings [Line Items]
Percent of Net Asset Value	2.20%
C000033161 | Alphabet, Inc.FR_02079K305
Holdings [Line Items]
Percent of Net Asset Value	0.70%
C000033161 | Tesla, Inc.FR_88160R101
Holdings [Line Items]
Percent of Net Asset Value	0.70%
C000033161 | SPDR Portfolio Aggregate Bond ETFFR_78464A649
Holdings [Line Items]
Percent of Net Asset Value	15.70%
C000033161 | SPDR Bloomberg High Yield Bond ETFFR_78468R622
Holdings [Line Items]
Percent of Net Asset Value	9.70%
C000033161 | Taiwan Semiconductor Manufacturing Co. Ltd.FR_688910900
Holdings [Line Items]
Percent of Net Asset Value	1.10%
C000033161 | AssetShort-Term Investments
Holdings [Line Items]
Percent of Net Asset Value	8.20%
C000033161 | AssetCommon Stocks
Holdings [Line Items]
Percent of Net Asset Value	60.90%
C000033161 | AssetMutual Funds and Exchange Traded Products
Holdings [Line Items]
Percent of Net Asset Value	25.50%
C000033161 | AssetU.S. Treasury Obligations
Holdings [Line Items]
Percent of Net Asset Value	5%
C000033161 | AssetPreferred Stock
Holdings [Line Items]
Percent of Net Asset Value	0.20%
C000004441 | NVIDIA Corp.FR_67066G104
Holdings [Line Items]
Percent of Net Asset Value	7.70%
C000004441 | Microsoft Corp.FR_594918104
Holdings [Line Items]
Percent of Net Asset Value	7%
C000004441 | Amazon.com, Inc.FR_023135106
Holdings [Line Items]
Percent of Net Asset Value	4.90%
C000004441 | Meta Platforms, Inc.FR_30303M102
Holdings [Line Items]
Percent of Net Asset Value	3.50%
C000004441 | Apple, Inc.FR_037833100
Holdings [Line Items]
Percent of Net Asset Value	6.60%
C000004441 | Broadcom, Inc.FR_11135F101
Holdings [Line Items]
Percent of Net Asset Value	2.70%
C000004441 | Alphabet, Inc.FR_02079K305
Holdings [Line Items]
Percent of Net Asset Value	4.40%
C000004441 | Bank of America Corp.FR_060505104
Holdings [Line Items]
Percent of Net Asset Value	2.30%
C000004441 | JPMorgan Chase & Co.FR_46625H100
Holdings [Line Items]
Percent of Net Asset Value	2.20%
C000004441 | Home Depot, Inc.FR_437076102
Holdings [Line Items]
Percent of Net Asset Value	1.80%
C000004441 | IndustrySemiconductors & Semiconductor Equipment
Holdings [Line Items]
Percent of Net Asset Value	13.40%
C000004441 | IndustrySoftware
Holdings [Line Items]
Percent of Net Asset Value	11.80%
C000004441 | IndustryInteractive Media & Services
Holdings [Line Items]
Percent of Net Asset Value	8.50%
C000004441 | IndustryBroadline Retail
Holdings [Line Items]
Percent of Net Asset Value	4.90%
C000004441 | IndustryFinancial Services
Holdings [Line Items]
Percent of Net Asset Value	4.40%
C000004441 | IndustryTechnology Hardware, Storage & Peripherals
Holdings [Line Items]
Percent of Net Asset Value	6.60%
C000004441 | IndustrySpecialty Retail
Holdings [Line Items]
Percent of Net Asset Value	3.60%
C000004441 | IndustryBanks
Holdings [Line Items]
Percent of Net Asset Value	5.40%
C000004441 | IndustryPharmaceuticals
Holdings [Line Items]
Percent of Net Asset Value	4.30%
C000004441 | IndustryHealthcare Equipment & Supplies
Holdings [Line Items]
Percent of Net Asset Value	2.60%