| 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 SPECTRUM FUND, INC. |
| Entity Central Index Key | 0000808303 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Dec. 31, 2024 |
| Shareholder Report | 12 Months Ended | 44 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 SPECTRUM FUND, INC. | |
| Entity Central Index Key | 0000808303 | |
| Entity Investment Company Type | N-1A | |
| Document Period End Date | Dec. 31, 2024 | |
| C000005512 | ||
| Shareholder Report [Line Items] | ||
| Fund Name | Spectrum Income Fund | |
| Class Name | Investor Class | |
| Trading Symbol | RPSIX | |
| 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] | This report describes changes to the fund that occurred during the reporting period. | |
| 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 Spectrum Income Fund - Investor Class $62 0.61% | |
| Expenses Paid, Amount | $ 62 | |
| Expense Ratio, Percent | 0.61% | |
| Factors Affecting Performance [Text Block] | What drove fund performance during the past 12 months? U.S. taxable investment-grade bonds produced positive returns in 2024. Bonds in developed non-U.S. markets produced negative returns in U.S. dollar terms due to weaker currencies versus the dollar and rising bond yields in some countries. Easing inflation pressures enabled the European Central Bank to reduce short-term interest rates four times starting in June. Emerging markets bond returns were mixed. U.S. stocks advanced during the period, buoyed by generally favorable corporate earnings and continuing interest in companies expected to benefit from artificial intelligence developments. High yield corporate bonds produced solid gains and strongly outperformed the investment-grade bond market. Versus the Bloomberg U.S. Aggregate Bond Index, results were supported by an out-of-benchmark exposure to dividend-paying equities. Similarly, the inclusion of high yield bonds as a diversifying exposure within the fund was additive during the period. On the negative side, an out-of-benchmark exposure to long-term U.S. Treasury bonds was detrimental to results over the period. Security selection among high yield bonds also weighed on results. The Spectrum Income Fund seeks a high level of current income with moderate share price fluctuation. The fund invests in a diversified group of underlying T. Rowe Price domestic bond funds, foreign bond funds, money market funds, and income-oriented stock funds. The diversifying sectors also provide exposures to key attributes that aim to support the overall portfolio’s risk and return profile over a range of market environments. | |
| 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 Spectrum Income Fund (Investor Class) 4.02 % 1.77 % 3.01 % Bloomberg U.S. Aggregate Bond Index (Regulatory/Strategy Benchmark) 1.25 - 1.35 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 | $ 5,894,081,000 | $ 5,894,081,000 |
| Holdings Count | Holding | 22 | 22 |
| Advisory Fees Paid, Amount | $ 30,014,000 | |
| InvestmentCompanyPortfolioTurnover | 38.70% | |
| Additional Fund Statistics [Text Block] | What are some fund statistics? Fund Statistics Total Net Assets (000s) $5,894,081 Number of Portfolio Holdings 22 | |
| Holdings [Text Block] | Asset Domestic Bond Funds 58.7 % International Bond Funds 29.9 Corporate Securities 7.1 Domestic Equity Funds 2.7 Short-Term and Other 1.6 | |
| Largest Holdings [Text Block] | Top Ten Holdings T. Rowe Price High Yield Fund 14.7 % T. Rowe Price New Income Fund 11.5 T. Rowe Price GNMA Fund 10.3 T. Rowe Price Emerging Markets Bond Fund 7.5 T. Rowe Price U.S. High Yield ETF 7.1 T. Rowe Price International Bond Fund (USD Hedged) 6.1 T. Rowe Price Floating Rate Fund 5.7 T. Rowe Price Short-Term Bond Fund 5.3 T. Rowe Price Dynamic Global Bond Fund 5.2 T. Rowe Price Dynamic Credit Fund 5.1 | |
| Updated Prospectus Web Address | www.troweprice.com/paperless | |
| C000227147 | ||
| Shareholder Report [Line Items] | ||
| Fund Name | Spectrum Income Fund | |
| Class Name | I Class | |
| Trading Symbol | TSPNX | |
| 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] | This report describes changes to the fund that occurred during the reporting period. | |
| 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 Spectrum Income Fund - I Class $47 0.46% | |
| Expenses Paid, Amount | $ 47 | |
| Expense Ratio, Percent | 0.46% | |
| Factors Affecting Performance [Text Block] | What drove fund performance during the past 12 months? U.S. taxable investment-grade bonds produced positive returns in 2024. Bonds in developed non-U.S. markets produced negative returns in U.S. dollar terms due to weaker currencies versus the dollar and rising bond yields in some countries. Easing inflation pressures enabled the European Central Bank to reduce short-term interest rates four times starting in June. Emerging markets bond returns were mixed. U.S. stocks advanced during the period, buoyed by generally favorable corporate earnings and continuing interest in companies expected to benefit from artificial intelligence developments. High yield corporate bonds produced solid gains and strongly outperformed the investment-grade bond market. Versus the Bloomberg U.S. Aggregate Bond Index, results were supported by an out-of-benchmark exposure to dividend-paying equities. Similarly, the inclusion of high yield bonds as a diversifying exposure within the fund was additive during the period. On the negative side, an out-of-benchmark exposure to long-term U.S. Treasury bonds was detrimental to results over the period. Security selection among high yield bonds also weighed on results. The Spectrum Income Fund seeks a high level of current income with moderate share price fluctuation. The fund invests in a diversified group of underlying T. Rowe Price domestic bond funds, foreign bond funds, money market funds, and income-oriented stock funds. The diversifying sectors also provide exposures to key attributes that aim to support the overall portfolio’s risk and return profile over a range of market environments. | |
| 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 Since Inception 5/3/21 Spectrum Income Fund (I Class) 4.17 % 0.54 % Bloomberg U.S. Aggregate Bond Index (Regulatory/Strategy Benchmark) 1.25 - 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 | May 03, 2021 | |
| 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 | $ 5,894,081,000 | $ 5,894,081,000 |
| Holdings Count | Holding | 22 | 22 |
| Advisory Fees Paid, Amount | $ 30,014,000 | |
| InvestmentCompanyPortfolioTurnover | 38.70% | |
| Additional Fund Statistics [Text Block] | What are some fund statistics? Fund Statistics Total Net Assets (000s) $5,894,081 Number of Portfolio Holdings 22 | |
| Holdings [Text Block] | Asset Domestic Bond Funds 58.7 % International Bond Funds 29.9 Corporate Securities 7.1 Domestic Equity Funds 2.7 Short-Term and Other 1.6 | |
| Largest Holdings [Text Block] | Top Ten Holdings T. Rowe Price High Yield Fund 14.7 % T. Rowe Price New Income Fund 11.5 T. Rowe Price GNMA Fund 10.3 T. Rowe Price Emerging Markets Bond Fund 7.5 T. Rowe Price U.S. High Yield ETF 7.1 T. Rowe Price International Bond Fund (USD Hedged) 6.1 T. Rowe Price Floating Rate Fund 5.7 T. Rowe Price Short-Term Bond Fund 5.3 T. Rowe Price Dynamic Global Bond Fund 5.2 T. Rowe Price Dynamic Credit Fund 5.1 | |
| Updated Prospectus Web Address | www.troweprice.com/paperless |
| Shareholder Report, Line Graph (Details) - Bloomberg U.S. Aggregate Bond Index - USD ($) | 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 | May 03, 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 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 |
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 11,432 | $ 11,793 | $ 11,210 | $ 11,203 | $ 11,291 | $ 10,570 | $ 10,923 | $ 11,016 | $ 10,699 | $ 10,502 | $ 11,026 | $ 11,569 | $ 12,299 | $ 12,298 | $ 12,291 | $ 12,071 | $ 12,492 | $ 12,409 | $ 12,332 | $ 11,985 | $ 11,620 | $ 11,599 | $ 11,341 | $ 11,003 | $ 10,688 | $ 10,516 | $ 10,514 | $ 10,531 | $ 10,687 | $ 10,645 | $ 10,556 | $ 10,406 | $ 10,321 | $ 10,638 | $ 10,589 | $ 10,360 | $ 10,055 | $ 10,113 | $ 9,990 | $ 10,161 | $ 10,000 | |
| Account Value | $ 469,581 | $ 484,412 | $ 460,485 | $ 460,185 | $ 463,783 | $ 434,184 | $ 448,681 | $ 452,502 | $ 439,484 | $ 431,404 | $ 452,929 | $ 475,234 | $ 505,213 | $ 505,154 | $ 504,893 | $ 500,000 |
| Shareholder Report, Average Annual Return (Details) | 12 Months Ended | 44 Months Ended | 60 Months Ended | 120 Months Ended |
| Dec. 31, 2024 | Dec. 31, 2024 | Dec. 31, 2024 | Dec. 31, 2024 | |
| Without Sales Load [Member] | C000005512 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 4.02% | 1.77% | 3.01% | |
| Without Sales Load [Member] | C000227147 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 4.17% | 0.54% | ||
| Bloomberg U.S. Aggregate Bond Index | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 1.25% | (0.33%) | 1.35% | |
| Bloomberg U.S. Aggregate Bond Index | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 1.25% | (1.70%) |
| Shareholder Report, Holdings (Details) | Dec. 31, 2024 |
| C000005512 | T. Rowe Price High Yield Fund | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.70% |
| C000005512 | T. Rowe Price New Income Fund | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.50% |
| C000005512 | T. Rowe Price GNMA Fund | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.30% |
| C000005512 | T. Rowe Price Emerging Markets Bond Fund | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.50% |
| C000005512 | T. Rowe Price U.S. High Yield ETF | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.10% |
| C000005512 | T. Rowe Price International Bond Fund (USD Hedged) | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.10% |
| C000005512 | T. Rowe Price Floating Rate Fund | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.70% |
| C000005512 | T. Rowe Price Short-Term Bond Fund | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| C000005512 | T. Rowe Price Dynamic Global Bond Fund | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.20% |
| C000005512 | T. Rowe Price Dynamic Credit Fund | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.10% |
| C000005512 | Domestic Bond Funds | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 58.70% |
| C000005512 | International Bond Funds | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 29.90% |
| C000005512 | Corporate Securities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.10% |
| C000005512 | Domestic Equity Funds | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| C000005512 | Other Holdings Grouping | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| C000227147 | T. Rowe Price High Yield Fund | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.70% |
| C000227147 | T. Rowe Price New Income Fund | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.50% |
| C000227147 | T. Rowe Price GNMA Fund | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.30% |
| C000227147 | T. Rowe Price Emerging Markets Bond Fund | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.50% |
| C000227147 | T. Rowe Price U.S. High Yield ETF | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.10% |
| C000227147 | T. Rowe Price International Bond Fund (USD Hedged) | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.10% |
| C000227147 | T. Rowe Price Floating Rate Fund | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.70% |
| C000227147 | T. Rowe Price Short-Term Bond Fund | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| C000227147 | T. Rowe Price Dynamic Global Bond Fund | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.20% |
| C000227147 | T. Rowe Price Dynamic Credit Fund | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.10% |
| C000227147 | Domestic Bond Funds | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 58.70% |
| C000227147 | International Bond Funds | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 29.90% |
| C000227147 | Corporate Securities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.10% |
| C000227147 | Domestic Equity Funds | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| C000227147 | Other Holdings Grouping | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
