| Form N-CSR Cover | 12 Months Ended |
| Dec. 31, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSR |
| Amendment Flag | false |
| Registrant Name | T. ROWE PRICE SCIENCE & TECHNOLOGY FUND, INC. |
| Entity Central Index Key | 0000819930 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Dec. 31, 2024 |
| Shareholder Report | 12 Months Ended | 105 Months Ended |
| Dec. 31, 2024 USD ($) Holding | Dec. 31, 2024 USD ($) Holding | |
| Shareholder Report [Line Items] | ||
| Document Type | N-CSR | |
| Amendment Flag | false | |
| Registrant Name | T. ROWE PRICE SCIENCE & TECHNOLOGY FUND, INC. | |
| Entity Central Index Key | 0000819930 | |
| Entity Investment Company Type | N-1A | |
| Document Period End Date | Dec. 31, 2024 | |
| C000005506 | ||
| Shareholder Report [Line Items] | ||
| Fund Name | Science & Technology Fund | |
| Class Name | Investor Class | |
| Trading Symbol | PRSCX | |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report | |
| Additional Information [Text Block] | You can find the fund’s prospectus, financial information on Form N‑CSR (which includes required tax information for dividends), holdings, proxy voting information, and other information at www.troweprice.com/prospectus info troweprice.com | |
| Material Fund Change Notice [Text Block] | ||
| Additional Information Phone Number | 1‑800‑638‑5660 | |
| Additional Information Email | info@troweprice.com</span>" id="sjs-B19"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 13.3333px; font-weight: 400; grid-area: auto; line-height: 17.3333px; margin: 0px; overflow: visible; text-align: justify;">info@troweprice.com</span> | |
| Additional Information Website | www.troweprice.com/prospectus | |
| Expenses [Text Block] | What were the fund costs for the last year? Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Science & Technology Fund - Investor Class $95 0.79% | |
| Expenses Paid, Amount | $ 95 | |
| Expense Ratio, Percent | 0.79% | |
| Factors Affecting Performance [Text Block] | What drove fund performance during the past 12 months? Science and technology stocks advanced during the period, buoyed by generally favorable corporate earnings and continuing interest in companies expected to benefit from artificial intelligence (AI) developments. Semiconductor companies NVIDIA and Broadcom were top absolute contributors in 2024. NVIDIA benefited from the ongoing infrastructure buildout to support AI functionality and rose following record sales of AI chips and a positive outlook regarding demand for Blackwell, its new platform. Broadcom advanced on enthusiasm around the company’s potential to meet custom artificial intelligence demands in a large addressable market. Shares of mobile gaming-focused app marketing platform AppLovin also appreciated following strong growth in its core gaming business and software platform business and encouraging revenue and earnings guidance. Semiconductor company Intel and software company Adobe detracted on an absolute basis. Intel declined on lower-than-expected guidance and concerns that its new Gaudi3 accelerator isn’t gaining share in the AI graphics processing unit market. Shares of Adobe fell after competitors announced AI tools that could cut into the company’s core business. We eliminated our positions in both holdings. We remain focused on investing in science and technology companies that we believe are on the right side of change, the right side of numbers, and the right side of macroeconomic trends. We plan to continue seeking companies that we believe are well positioned on a multiyear basis as well as those with idiosyncratic growth drivers, and we want to own them at the right time when both the multiple and numbers can increase relative to peers. | |
| Performance Past Does Not Indicate Future [Text] | The fund’s past performance is not a good predictor of the fund’s future performance. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 Year 5 Years 10 Years Science & Technology Fund (Investor Class) 40.27 % 16.54 % 17.28 % Russell 3000 Index (Regulatory Benchmark) 23.81 13.86 12.55 S&P North America Tech Index (Strategy Benchmark) 36.08 21.06 20.70 S&P 500 Index (Previous Benchmark) 25.02 14.53 13.10 The preceding line graph shows the value of a hypothetical $10,000 investment in the fund over the past 10 fiscal year periods or since inception (for funds lacking 10-year records). The fund’s performance information included in the line graph and table above is compared with a regulatory required index that represents an overall securities market (Regulatory Benchmark). In addition, the line graph and table may also include one or more indexes that more closely aligns to the fund's investment strategy (Strategy Benchmark(s)). Due to new SEC Rules on shareholder reporting the fund adopted a new broad-based securities market index, referred to as the Regulatory Benchmark. Market index returns do not include expenses, which are deducted from fund returns. The fund's total return figures reflect the reinvestment of dividends and capital gains, if any.Neither the fund’s returns nor the index returns reflect the deduction of taxes that a shareholder would pay on fund distributions or redemptions of fund shares. The fund’s past performance is not a good predictor of the fund’s future performance. | |
| No Deduction of Taxes [Text Block] | Neither the fund’s returns nor the index returns reflect the deduction of taxes that a shareholder would pay on fund distributions or redemptions of fund shares. | |
| Performance Table Market Index Changed [Text Block] | Due to new SEC Rules on shareholder reporting the fund adopted a new broad-based securities market index, referred to as the Regulatory Benchmark. | |
| Updated Performance Information Location [Text Block] | Updated performance information can be found at www.troweprice.com. | |
| Distribution of Capital [Text Block] | The fund's total return figures reflect the reinvestment of dividends and capital gains, if any. | |
| AssetsNet | $ 10,285,386,000 | $ 10,285,386,000 |
| Holdings Count | Holding | 123 | 123 |
| Advisory Fees Paid, Amount | $ 59,422,000 | |
| InvestmentCompanyPortfolioTurnover | 217.30% | |
| Additional Fund Statistics [Text Block] | What are some fund statistics? Fund Statistics Total Net Assets (000s) $10,285,386 Number of Portfolio Holdings 123 | |
| Holdings [Text Block] | Industry U.S. Internet Media/Advertising 19.8 % Infrastructure and Developer Tool Software 13.3 Digital Systems 12.3 Processors 11.4 Collaboration and Productivity Software 5.0 Consumer Electronics 4.9 U.S. Internet Retail 4.6 Front-Office Applications Software 4.4 Wireline Equipment 3.8 Other 20.5 | |
| Largest Holdings [Text Block] | Top Ten Holdings NVIDIA 12.3 % Alphabet 9.7 Meta Platforms 9.3 Microsoft 8.8 Broadcom 8.5 Apple 4.9 Amazon.com 4.6 Salesforce 3.1 ServiceNow 2.7 Oracle 2.5 | |
| Updated Prospectus Web Address | www.troweprice.com/paperless | |
| C000005507 | ||
| Shareholder Report [Line Items] | ||
| Fund Name | Science & Technology Fund | |
| Class Name | Advisor Class | |
| Trading Symbol | PASTX | |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report | |
| Additional Information [Text Block] | You can find the fund’s prospectus, financial information on Form N‑CSR (which includes required tax information for dividends), holdings, proxy voting information, and other information at www.troweprice.com/prospectus info troweprice.com | |
| Material Fund Change Notice [Text Block] | ||
| Additional Information Phone Number | 1‑800‑638‑5660 | |
| Additional Information Email | info@troweprice.com</span>" id="sjs-B48"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 13.3333px; font-weight: 400; grid-area: auto; line-height: 17.3333px; margin: 0px; overflow: visible; text-align: justify;">info@troweprice.com</span> | |
| Additional Information Website | www.troweprice.com/prospectus | |
| Expenses [Text Block] | What were the fund costs for the last year? Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Science & Technology Fund - Advisor Class $127 1.06% | |
| Expenses Paid, Amount | $ 127 | |
| Expense Ratio, Percent | 1.06% | |
| Factors Affecting Performance [Text Block] | What drove fund performance during the past 12 months? Science and technology stocks advanced during the period, buoyed by generally favorable corporate earnings and continuing interest in companies expected to benefit from artificial intelligence (AI) developments. Semiconductor companies NVIDIA and Broadcom were top absolute contributors in 2024. NVIDIA benefited from the ongoing infrastructure buildout to support AI functionality and rose following record sales of AI chips and a positive outlook regarding demand for Blackwell, its new platform. Broadcom advanced on enthusiasm around the company’s potential to meet custom artificial intelligence demands in a large addressable market. Shares of mobile gaming-focused app marketing platform AppLovin also appreciated following strong growth in its core gaming business and software platform business and encouraging revenue and earnings guidance. Semiconductor company Intel and software company Adobe detracted on an absolute basis. Intel declined on lower-than-expected guidance and concerns that its new Gaudi3 accelerator isn’t gaining share in the AI graphics processing unit market. Shares of Adobe fell after competitors announced AI tools that could cut into the company’s core business. We eliminated our positions in both holdings. We remain focused on investing in science and technology companies that we believe are on the right side of change, the right side of numbers, and the right side of macroeconomic trends. We plan to continue seeking companies that we believe are well positioned on a multiyear basis as well as those with idiosyncratic growth drivers, and we want to own them at the right time when both the multiple and numbers can increase relative to peers. | |
| Performance Past Does Not Indicate Future [Text] | The fund’s past performance is not a good predictor of the fund’s future performance. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 Year 5 Years 10 Years Science & Technology Fund (Advisor Class) 39.88 % 16.22 % 16.98 % Russell 3000 Index (Regulatory Benchmark) 23.81 13.86 12.55 S&P North America Tech Index (Strategy Benchmark) 36.08 21.06 20.70 S&P 500 Index (Previous Benchmark) 25.02 14.53 13.10 The preceding line graph shows the value of a hypothetical $10,000 investment in the fund over the past 10 fiscal year periods or since inception (for funds lacking 10-year records). The fund’s performance information included in the line graph and table above is compared with a regulatory required index that represents an overall securities market (Regulatory Benchmark). In addition, the line graph and table may also include one or more indexes that more closely aligns to the fund's investment strategy (Strategy Benchmark(s)). Due to new SEC Rules on shareholder reporting the fund adopted a new broad-based securities market index, referred to as the Regulatory Benchmark. Market index returns do not include expenses, which are deducted from fund returns. The fund's total return figures reflect the reinvestment of dividends and capital gains, if any.Neither the fund’s returns nor the index returns reflect the deduction of taxes that a shareholder would pay on fund distributions or redemptions of fund shares. The fund’s past performance is not a good predictor of the fund’s future performance. | |
| No Deduction of Taxes [Text Block] | Neither the fund’s returns nor the index returns reflect the deduction of taxes that a shareholder would pay on fund distributions or redemptions of fund shares. | |
| Performance Table Market Index Changed [Text Block] | Due to new SEC Rules on shareholder reporting the fund adopted a new broad-based securities market index, referred to as the Regulatory Benchmark. | |
| Updated Performance Information Location [Text Block] | Updated performance information can be found at www.troweprice.com. | |
| Distribution of Capital [Text Block] | The fund's total return figures reflect the reinvestment of dividends and capital gains, if any. | |
| AssetsNet | $ 10,285,386,000 | $ 10,285,386,000 |
| Holdings Count | Holding | 123 | 123 |
| Advisory Fees Paid, Amount | $ 59,422,000 | |
| InvestmentCompanyPortfolioTurnover | 217.30% | |
| Additional Fund Statistics [Text Block] | What are some fund statistics? Fund Statistics Total Net Assets (000s) $10,285,386 Number of Portfolio Holdings 123 | |
| Holdings [Text Block] | Industry U.S. Internet Media/Advertising 19.8 % Infrastructure and Developer Tool Software 13.3 Digital Systems 12.3 Processors 11.4 Collaboration and Productivity Software 5.0 Consumer Electronics 4.9 U.S. Internet Retail 4.6 Front-Office Applications Software 4.4 Wireline Equipment 3.8 Other 20.5 | |
| Largest Holdings [Text Block] | Top Ten Holdings NVIDIA 12.3 % Alphabet 9.7 Meta Platforms 9.3 Microsoft 8.8 Broadcom 8.5 Apple 4.9 Amazon.com 4.6 Salesforce 3.1 ServiceNow 2.7 Oracle 2.5 | |
| Updated Prospectus Web Address | www.troweprice.com/paperless | |
| C000169947 | ||
| Shareholder Report [Line Items] | ||
| Fund Name | Science & Technology Fund | |
| Class Name | I Class | |
| Trading Symbol | TSNIX | |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report | |
| Additional Information [Text Block] | You can find the fund’s prospectus, financial information on Form N‑CSR (which includes required tax information for dividends), holdings, proxy voting information, and other information at www.troweprice.com/prospectus info troweprice.com | |
| Material Fund Change Notice [Text Block] | ||
| Additional Information Phone Number | 1‑800‑638‑5660 | |
| Additional Information Email | info@troweprice.com</span>" id="sjs-B77"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 13.3333px; font-weight: 400; grid-area: auto; line-height: 17.3333px; margin: 0px; overflow: visible; text-align: justify;">info@troweprice.com</span> | |
| Additional Information Website | www.troweprice.com/prospectus | |
| Expenses [Text Block] | What were the fund costs for the last year? Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Science & Technology Fund - I Class $81 0.67% | |
| Expenses Paid, Amount | $ 81 | |
| Expense Ratio, Percent | 0.67% | |
| Factors Affecting Performance [Text Block] | What drove fund performance during the past 12 months? Science and technology stocks advanced during the period, buoyed by generally favorable corporate earnings and continuing interest in companies expected to benefit from artificial intelligence (AI) developments. Semiconductor companies NVIDIA and Broadcom were top absolute contributors in 2024. NVIDIA benefited from the ongoing infrastructure buildout to support AI functionality and rose following record sales of AI chips and a positive outlook regarding demand for Blackwell, its new platform. Broadcom advanced on enthusiasm around the company’s potential to meet custom artificial intelligence demands in a large addressable market. Shares of mobile gaming-focused app marketing platform AppLovin also appreciated following strong growth in its core gaming business and software platform business and encouraging revenue and earnings guidance. Semiconductor company Intel and software company Adobe detracted on an absolute basis. Intel declined on lower-than-expected guidance and concerns that its new Gaudi3 accelerator isn’t gaining share in the AI graphics processing unit market. Shares of Adobe fell after competitors announced AI tools that could cut into the company’s core business. We eliminated our positions in both holdings. We remain focused on investing in science and technology companies that we believe are on the right side of change, the right side of numbers, and the right side of macroeconomic trends. We plan to continue seeking companies that we believe are well positioned on a multiyear basis as well as those with idiosyncratic growth drivers, and we want to own them at the right time when both the multiple and numbers can increase relative to peers. | |
| Performance Past Does Not Indicate Future [Text] | The fund’s past performance is not a good predictor of the fund’s future performance. | |
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 Year 5 Years Since Inception 3/23/16 Science & Technology Fund (I Class) 40.43 % 16.68 % 19.57 % Russell 3000 Index (Regulatory Benchmark) 23.81 13.86 14.42 S&P North America Tech Index (Strategy Benchmark) 36.08 21.06 22.83 S&P 500 Index (Previous Benchmark) 25.02 14.53 14.86 The preceding line graph shows the value of a hypothetical $500,000 investment in the fund over the past 10 fiscal year periods or since inception (for funds lacking 10-year records). The fund’s performance information included in the line graph and table above is compared with a regulatory required index that represents an overall securities market (Regulatory Benchmark). In addition, the line graph and table may also include one or more indexes that more closely aligns to the fund's investment strategy (Strategy Benchmark(s)). Due to new SEC Rules on shareholder reporting the fund adopted a new broad-based securities market index, referred to as the Regulatory Benchmark. Market index returns do not include expenses, which are deducted from fund returns. The fund's total return figures reflect the reinvestment of dividends and capital gains, if any.Neither the fund’s returns nor the index returns reflect the deduction of taxes that a shareholder would pay on fund distributions or redemptions of fund shares. The fund’s past performance is not a good predictor of the fund’s future performance. | |
| Performance Inception Date | Mar. 23, 2016 | |
| No Deduction of Taxes [Text Block] | Neither the fund’s returns nor the index returns reflect the deduction of taxes that a shareholder would pay on fund distributions or redemptions of fund shares. | |
| Performance Table Market Index Changed [Text Block] | Due to new SEC Rules on shareholder reporting the fund adopted a new broad-based securities market index, referred to as the Regulatory Benchmark. | |
| Updated Performance Information Location [Text Block] | Updated performance information can be found at www.troweprice.com. | |
| Distribution of Capital [Text Block] | The fund's total return figures reflect the reinvestment of dividends and capital gains, if any. | |
| AssetsNet | $ 10,285,386,000 | $ 10,285,386,000 |
| Holdings Count | Holding | 123 | 123 |
| Advisory Fees Paid, Amount | $ 59,422,000 | |
| InvestmentCompanyPortfolioTurnover | 217.30% | |
| Additional Fund Statistics [Text Block] | What are some fund statistics? Fund Statistics Total Net Assets (000s) $10,285,386 Number of Portfolio Holdings 123 | |
| Holdings [Text Block] | Industry U.S. Internet Media/Advertising 19.8 % Infrastructure and Developer Tool Software 13.3 Digital Systems 12.3 Processors 11.4 Collaboration and Productivity Software 5.0 Consumer Electronics 4.9 U.S. Internet Retail 4.6 Front-Office Applications Software 4.4 Wireline Equipment 3.8 Other 20.5 | |
| Largest Holdings [Text Block] | Top Ten Holdings NVIDIA 12.3 % Alphabet 9.7 Meta Platforms 9.3 Microsoft 8.8 Broadcom 8.5 Apple 4.9 Amazon.com 4.6 Salesforce 3.1 ServiceNow 2.7 Oracle 2.5 | |
| Updated Prospectus Web Address | www.troweprice.com/paperless |
| Shareholder Report, Line Graph (Details) - USD ($) | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Mar. 23, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 |
| Russell 3000 Index | ||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 32,604 | $ 31,767 | $ 29,904 | $ 28,973 | $ 26,334 | $ 23,497 | $ 24,288 | $ 22,408 | $ 20,907 | $ 19,506 | $ 20,418 | $ 24,512 | $ 25,877 | $ 23,681 | $ 23,705 | $ 21,900 | $ 20,593 | $ 17,957 | $ 16,443 | $ 13,475 | $ 17,035 | $ 15,614 | $ 15,435 | $ 14,828 | $ 13,002 | $ 15,172 | $ 14,163 | $ 13,633 | $ 13,721 | $ 12,903 | $ 12,339 | $ 11,978 | $ 11,327 | $ 10,870 | $ 10,412 | $ 10,145 | $ 10,048 | $ 9,455 | $ 10,194 | $ 10,180 | $ 10,000 | |
| Russell 3000 Index | ||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||||
| Account Value | 32,604 | 31,767 | 29,904 | 28,973 | 26,334 | 23,497 | 24,288 | 22,408 | 20,907 | 19,506 | 20,418 | 24,512 | 25,877 | 23,681 | 23,705 | 21,900 | 20,593 | 17,957 | 16,443 | 13,475 | 17,035 | 15,614 | 15,435 | 14,828 | 13,002 | 15,172 | 14,163 | 13,633 | 13,721 | 12,903 | 12,339 | 11,978 | 11,327 | 10,870 | 10,412 | 10,145 | 10,048 | 9,455 | 10,194 | 10,180 | 10,000 | |
| Russell 3000 Index | ||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||||
| Account Value | 1,630,405 | 1,588,574 | 1,495,422 | 1,448,828 | 1,316,884 | 1,175,036 | 1,214,555 | 1,120,575 | 1,045,505 | 975,447 | 1,021,033 | 1,225,746 | 1,294,052 | 1,184,189 | 1,185,394 | 1,095,156 | 1,029,795 | 897,960 | 822,251 | 673,824 | 851,861 | 780,826 | 771,853 | 741,489 | 650,181 | 758,690 | 708,236 | 681,725 | 686,147 | 645,255 | 617,048 | 598,985 | 566,452 | 543,571 | 520,674 | 507,328 | $ 500,000 | |||||
| S&P North America Tech Index | ||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||||
| Account Value | 65,639 | 61,969 | 60,838 | 55,622 | 48,237 | 41,170 | 42,082 | 36,360 | 29,937 | 29,483 | 31,472 | 41,193 | 46,313 | 42,468 | 42,546 | 37,890 | 36,640 | 32,278 | 29,127 | 22,027 | 25,242 | 22,581 | 22,286 | 21,227 | 17,691 | 21,527 | 19,769 | 18,347 | 17,196 | 15,796 | 14,664 | 13,993 | 12,481 | 12,431 | 11,017 | 11,041 | 10,991 | 9,944 | 10,230 | 10,149 | 10,000 | |
| S&P 500 Index | ||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||||
| Account Value | 34,254 | 33,448 | 31,589 | 30,291 | 27,399 | 24,531 | 25,361 | 23,322 | 21,696 | 20,170 | 21,206 | 25,276 | 26,494 | 23,863 | 23,724 | 21,856 | 20,585 | 18,355 | 16,850 | 13,979 | 17,386 | 15,940 | 15,674 | 15,027 | 13,223 | 15,290 | 14,195 | 13,724 | 13,829 | 12,967 | 12,411 | 12,039 | 11,351 | 10,933 | 10,527 | 10,275 | 10,138 | 9,471 | 10,123 | 10,095 | 10,000 | |
| S&P North America Tech Index | ||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||||
| Account Value | 65,639 | 61,969 | 60,838 | 55,622 | 48,237 | 41,170 | 42,082 | 36,360 | 29,937 | 29,483 | 31,472 | 41,193 | 46,313 | 42,468 | 42,546 | 37,890 | 36,640 | 32,278 | 29,127 | 22,027 | 25,242 | 22,581 | 22,286 | 21,227 | 17,691 | 21,527 | 19,769 | 18,347 | 17,196 | 15,796 | 14,664 | 13,993 | 12,481 | 12,431 | 11,017 | 11,041 | 10,991 | 9,944 | 10,230 | 10,149 | 10,000 | |
| S&P 500 Index | ||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||||
| Account Value | 34,254 | 33,448 | 31,589 | 30,291 | 27,399 | 24,531 | 25,361 | 23,322 | 21,696 | 20,170 | 21,206 | 25,276 | 26,494 | 23,863 | 23,724 | 21,856 | 20,585 | 18,355 | 16,850 | 13,979 | 17,386 | 15,940 | 15,674 | 15,027 | 13,223 | 15,290 | 14,195 | 13,724 | 13,829 | 12,967 | 12,411 | 12,039 | 11,351 | 10,933 | 10,527 | 10,275 | $ 10,138 | $ 9,471 | $ 10,123 | $ 10,095 | $ 10,000 | |
| S&P North America Tech Index | ||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||||
| Account Value | 3,039,836 | 2,869,890 | 2,817,481 | 2,575,910 | 2,233,918 | 1,906,635 | 1,948,854 | 1,683,886 | 1,386,429 | 1,365,417 | 1,457,528 | 1,907,698 | 2,144,834 | 1,966,757 | 1,970,367 | 1,754,760 | 1,696,853 | 1,494,839 | 1,348,898 | 1,020,106 | 1,169,009 | 1,045,741 | 1,032,083 | 983,065 | 819,302 | 996,923 | 915,527 | 849,659 | 796,374 | 731,535 | 679,130 | 648,026 | 577,996 | 575,678 | 510,195 | 511,318 | 500,000 | |||||
| S&P 500 Index | ||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 1,686,242 | $ 1,646,573 | $ 1,555,035 | $ 1,491,157 | $ 1,348,781 | $ 1,207,594 | $ 1,248,461 | $ 1,148,093 | $ 1,068,023 | $ 992,946 | $ 1,043,916 | $ 1,244,255 | $ 1,304,230 | $ 1,174,695 | $ 1,167,897 | $ 1,075,919 | $ 1,013,345 | $ 903,577 | $ 829,507 | $ 688,140 | $ 855,875 | $ 784,702 | $ 771,598 | $ 739,760 | $ 650,922 | $ 752,684 | $ 698,801 | $ 675,602 | $ 680,770 | $ 638,353 | $ 610,979 | $ 592,676 | $ 558,780 | $ 538,198 | $ 518,235 | $ 505,816 | $ 500,000 |
| Shareholder Report, Average Annual Return (Details) | 12 Months Ended | 60 Months Ended | 105 Months Ended | 120 Months Ended |
| Dec. 31, 2024 | Dec. 31, 2024 | Dec. 31, 2024 | Dec. 31, 2024 | |
| Without Sales Load [Member] | C000005506 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 40.27% | 16.54% | 17.28% | |
| Without Sales Load [Member] | C000005507 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 39.88% | 16.22% | 16.98% | |
| Without Sales Load [Member] | C000169947 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 40.43% | 16.68% | 19.57% | |
| Russell 3000 Index | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 23.81% | 13.86% | 12.55% | |
| Russell 3000 Index | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 23.81% | 13.86% | 12.55% | |
| Russell 3000 Index | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 23.81% | 13.86% | 14.42% | |
| S&P North America Tech Index | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 36.08% | 21.06% | 20.70% | |
| S&P 500 Index | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 25.02% | 14.53% | 13.10% | |
| S&P North America Tech Index | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 36.08% | 21.06% | 20.70% | |
| S&P 500 Index | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 25.02% | 14.53% | 13.10% | |
| S&P North America Tech Index | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 36.08% | 21.06% | 22.83% | |
| S&P 500 Index | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 25.02% | 14.53% | 14.86% |
| Shareholder Report, Holdings (Details) | Dec. 31, 2024 |
| C000005506 | NVIDIA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.30% |
| C000005506 | Alphabet | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.70% |
| C000005506 | Meta Platforms | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.30% |
| C000005506 | Microsoft | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.80% |
| C000005506 | Broadcom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.50% |
| C000005506 | Apple | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| C000005506 | Amazon.com | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| C000005506 | Salesforce | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| C000005506 | ServiceNow | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| C000005506 | Oracle | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| C000005506 | U.S. Internet Media/Advertising | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.80% |
| C000005506 | Infrastructure and Developer Tool Software | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.30% |
| C000005506 | Digital Systems | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.30% |
| C000005506 | Processors | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.40% |
| C000005506 | Collaboration and Productivity Software | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| C000005506 | Consumer Electronics | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| C000005506 | U.S. Internet Retail | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| C000005506 | Front-Office Applications Software | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.40% |
| C000005506 | Wireline Equipment | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| C000005506 | Other Holdings Grouping | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 20.50% |
| C000005507 | NVIDIA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.30% |
| C000005507 | Alphabet | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.70% |
| C000005507 | Meta Platforms | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.30% |
| C000005507 | Microsoft | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.80% |
| C000005507 | Broadcom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.50% |
| C000005507 | Apple | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| C000005507 | Amazon.com | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| C000005507 | Salesforce | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| C000005507 | ServiceNow | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| C000005507 | Oracle | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| C000005507 | U.S. Internet Media/Advertising | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.80% |
| C000005507 | Infrastructure and Developer Tool Software | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.30% |
| C000005507 | Digital Systems | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.30% |
| C000005507 | Processors | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.40% |
| C000005507 | Collaboration and Productivity Software | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| C000005507 | Consumer Electronics | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| C000005507 | U.S. Internet Retail | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| C000005507 | Front-Office Applications Software | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.40% |
| C000005507 | Wireline Equipment | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| C000005507 | Other Holdings Grouping | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 20.50% |
| C000169947 | NVIDIA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.30% |
| C000169947 | Alphabet | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.70% |
| C000169947 | Meta Platforms | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.30% |
| C000169947 | Microsoft | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.80% |
| C000169947 | Broadcom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.50% |
| C000169947 | Apple | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| C000169947 | Amazon.com | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| C000169947 | Salesforce | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| C000169947 | ServiceNow | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| C000169947 | Oracle | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| C000169947 | U.S. Internet Media/Advertising | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.80% |
| C000169947 | Infrastructure and Developer Tool Software | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.30% |
| C000169947 | Digital Systems | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.30% |
| C000169947 | Processors | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.40% |
| C000169947 | Collaboration and Productivity Software | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| C000169947 | Consumer Electronics | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| C000169947 | U.S. Internet Retail | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| C000169947 | Front-Office Applications Software | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.40% |
| C000169947 | Wireline Equipment | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| C000169947 | Other Holdings Grouping | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 20.50% |
