| Form N-CSR Cover | 6 Months Ended |
| Jun. 30, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSRS |
| Amendment Flag | false |
| Registrant Name | T. ROWE PRICE FINANCIAL SERVICES FUND, INC. |
| Entity Central Index Key | 0001019286 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Jun. 30, 2024 |
| Shareholder Report | 6 Months Ended |
| Jun. 30, 2024 USD ($) Holding | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSRS |
| Amendment Flag | false |
| Registrant Name | T. ROWE PRICE FINANCIAL SERVICES FUND, INC. |
| Entity Central Index Key | 0001019286 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Jun. 30, 2024 |
| C000005450 | |
| Shareholder Report [Line Items] | |
| Fund Name | Financial Services Fund |
| Class Name | Investor Class |
| Trading Symbol | PRISX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Financial Services Fund (the "fund") for the period of January 1, 2024 to June 30, 2024. 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 |
| Shareholder Report Annual or Semi-Annual | Semi-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-B20"><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</span>" id="sjs-B21"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 13.3333px; font-weight: 700; grid-area: auto; line-height: 17.3333px; margin: 0px; overflow: visible; text-align: justify;">www.troweprice.com/prospectus</span> |
| Expenses [Text Block] | What were the fund costs for the last six months? Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Financial Services Fund - Investor Class $44 0.83% |
| Expenses Paid, Amount | $ 44 |
| Expense Ratio, Percent | 0.83% |
| Updated Performance Information Location [Text Block] | If you invest directly with T. Rowe Price, you can elect to receive future shareholder reports or other important documents through electronic delivery by enrolling at www.troweprice.com/paperless |
| AssetsNet | $ 1,529,337,000 |
| Holdings Count | Holding | 98 |
| InvestmentCompanyPortfolioTurnover | 23.80% |
| Additional Fund Statistics [Text Block] | What are some fund statistics? Fund Statistics Total Net Assets (000s) $1,529,337 Number of Portfolio Holdings 98 |
| Additional Fund Statistics Significance or Limits [Text Block] | Portfolio Turnover Rate 23.8% |
| Holdings [Text Block] | Industry Allocation Property & Casualty Insurance 17.0 % Money Center Banks 15.2 Diversified Financials 9.8 Regional Banks 9.2 Asset Managers 9.1 Security Brokers & Dealers 8.7 Life Insurance 5.7 Consumer Finance 4.7 Insurance Agents - Brokers & Services 4.1 Other 16.5 |
| Largest Holdings [Text Block] | Top Ten Holdings Wells Fargo 4.3 % Citigroup 4.2 Visa 3.9 Charles Schwab 3.9 Bank of America 3.9 Mastercard 3.7 Chubb 3.5 Berkshire Hathaway 2.9 JPMorgan Chase 2.8 Marsh & McLennan 2.5 |
| Material Fund Change [Text Block] | |
| Updated Prospectus Web Address | www.troweprice.com/paperless</span>" id="sjs-B34"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 13.8667px; margin: 0px; overflow: visible; text-align: justify;">www.troweprice.com/paperless</span> |
| C000177205 | |
| Shareholder Report [Line Items] | |
| Fund Name | Financial Services Fund |
| Class Name | I Class |
| Trading Symbol | TFIFX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Financial Services Fund (the "fund") for the period of January 1, 2024 to June 30, 2024. 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 |
| Shareholder Report Annual or Semi-Annual | Semi-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-B45"><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</span>" id="sjs-B46"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 13.3333px; font-weight: 700; grid-area: auto; line-height: 17.3333px; margin: 0px; overflow: visible; text-align: justify;">www.troweprice.com/prospectus</span> |
| Expenses [Text Block] | What were the fund costs for the last six months? Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Financial Services Fund - I Class $36 0.68% |
| Expenses Paid, Amount | $ 36 |
| Expense Ratio, Percent | 0.68% |
| Updated Performance Information Location [Text Block] | If you invest directly with T. Rowe Price, you can elect to receive future shareholder reports or other important documents through electronic delivery by enrolling at www.troweprice.com/paperless |
| AssetsNet | $ 1,529,337,000 |
| Holdings Count | Holding | 98 |
| InvestmentCompanyPortfolioTurnover | 23.80% |
| Additional Fund Statistics [Text Block] | What are some fund statistics? Fund Statistics Total Net Assets (000s) $1,529,337 Number of Portfolio Holdings 98 |
| Additional Fund Statistics Significance or Limits [Text Block] | Portfolio Turnover Rate 23.8% |
| Holdings [Text Block] | Industry Allocation Property & Casualty Insurance 17.0 % Money Center Banks 15.2 Diversified Financials 9.8 Regional Banks 9.2 Asset Managers 9.1 Security Brokers & Dealers 8.7 Life Insurance 5.7 Consumer Finance 4.7 Insurance Agents - Brokers & Services 4.1 Other 16.5 |
| Largest Holdings [Text Block] | Top Ten Holdings Wells Fargo 4.3 % Citigroup 4.2 Visa 3.9 Charles Schwab 3.9 Bank of America 3.9 Mastercard 3.7 Chubb 3.5 Berkshire Hathaway 2.9 JPMorgan Chase 2.8 Marsh & McLennan 2.5 |
| Material Fund Change [Text Block] | |
| Updated Prospectus Web Address | www.troweprice.com/paperless</span>" id="sjs-B59"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 13.8667px; margin: 0px; overflow: visible; text-align: justify;">www.troweprice.com/paperless</span> |
| Shareholder Report, Holdings (Details) | Jun. 30, 2024 |
| C000005450 | Wells Fargo | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.30% |
| C000005450 | Citigroup | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| C000005450 | Visa | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| C000005450 | Charles Schwab | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| C000005450 | Bank of America | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| C000005450 | Mastercard | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.70% |
| C000005450 | Chubb | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| C000005450 | Berkshire Hathaway | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| C000005450 | JPMorgan Chase | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| C000005450 | Marsh & McLennan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| C000005450 | Property & Casualty Insurance | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 17% |
| C000005450 | Money Center Banks | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.20% |
| C000005450 | Diversified Financials | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.80% |
| C000005450 | Regional Banks | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.20% |
| C000005450 | Asset Managers | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.10% |
| C000005450 | Security Brokers & Dealers | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.70% |
| C000005450 | Life Insurance | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.70% |
| C000005450 | Consumer Finance | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.70% |
| C000005450 | Insurance Agents - Brokers & Services | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| C000177205 | Wells Fargo | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.30% |
| C000177205 | Citigroup | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| C000177205 | Visa | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| C000177205 | Charles Schwab | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| C000177205 | Bank of America | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| C000177205 | Mastercard | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.70% |
| C000177205 | Chubb | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| C000177205 | Berkshire Hathaway | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| C000177205 | JPMorgan Chase | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| C000177205 | Marsh & McLennan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| C000177205 | Property & Casualty Insurance | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 17% |
| C000177205 | Money Center Banks | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.20% |
| C000177205 | Diversified Financials | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.80% |
| C000177205 | Regional Banks | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.20% |
| C000177205 | Asset Managers | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.10% |
| C000177205 | Security Brokers & Dealers | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.70% |
| C000177205 | Life Insurance | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.70% |
| C000177205 | Consumer Finance | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.70% |
| C000177205 | Insurance Agents - Brokers & Services | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
