Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	AIM INVESTMENT SECURITIES FUNDS (INVESCO INVESTMENT SECURITIES FUNDS)
Prospectus Date	rr_ProspectusDate	Jun. 28, 2012
Class Institutional | Invesco Dynamics Fund
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	Fund Summaries INVESCO DYNAMICS FUND
Objective [Heading]	rr_ObjectiveHeading	Investment Objective(s)
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The Fund’s investment objective is long-term growth of capital.
Expense [Heading]	rr_ExpenseHeading	Fees and Expenses of the Fund
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.
Shareholder Fees Caption [Text]	rr_ShareholderFeesCaption	Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	Portfolio Turnover.
Portfolio Turnover [Text Block]	rr_PortfolioTurnoverTextBlock	The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual Fund operating expenses or in the example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 141% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	141.00%
Expense Example [Heading]	rr_ExpenseExampleHeading	Example.
Expense Example Narrative [Text Block]	rr_ExpenseExampleNarrativeTextBlock	This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.           The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same.           Although your actual costs may be higher or lower, based on these assumptions, your costs would be:
Strategy [Heading]	rr_StrategyHeading	Principal Investment Strategies of the Fund
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	The Fund invests primarily in equity securities of mid-capitalization issuers.           The Fund may invest up to 25% of its total assets in foreign securities.           The Fund considers an issuer to be a mid-capitalization issuer if it has a market capitalization, at the time of purchase, within the range of the largest and smallest capitalized issuers included in the Russell Midcap® Growth Index during the most recent 11-month period (based on month-end data) plus the most recent data during the current month. As of February 29, 2012, the capitalization of companies in the Russell Midcap® Growth Index range from $162 million to $21.5 billion.           The Adviser uses a bottom-up stock selection process designed to seek returns in excess of the benchmark as well as a disciplined portfolio construction process designed to manage risk. To narrow the investment universe, the Adviser uses a holistic approach that emphasizes fundamental research and, to a lesser extent, includes quantitative analysis. The Adviser then closely examines company fundamentals, including detailed modeling of all of a company’s financial statements and discussions with company management teams, suppliers, distributors, competitors, and customers. The Adviser uses a variety of valuation techniques based on the company in question, the industry in which the company operates, the stage of the business cycle, and other factors that best reflect a company’s value. The Adviser seeks to invest in companies with solid management teams, sound business models, strong financial health, attractive growth outlooks, and compelling valuations levels.          The Adviser considers whether to sell a particular security when a company hits the price target, a company’s fundamentals deteriorate, or the catalysts for growth are no longer present or reflected in the stock price.           In attempting to meet its investment objective, the Fund engages in active and frequent trading of portfolio securities.
Risk [Heading]	rr_RiskHeading	Principal Risks of Investing in the Fund
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	As with any mutual fund investment, loss of money is a risk of investing. An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency. The risks associated with an investment in the Fund can increase during times of significant market volatility. The principal risks of investing in the Fund are:           Active Trading Risk. The Fund engages in frequent trading of portfolio securities. Active trading results in added expenses and may result in a lower return and increased tax liability.           Foreign Securities Risk. The Fund’s foreign investments may be affected by changes in a foreign country’s exchange rates, political and social instability, changes in economic or taxation policies, difficulties when enforcing obligations, decreased liquidity, and increased volatility. Foreign companies may be subject to less regulation resulting in less publicly available information about the companies.           Growth Investing Risk. Growth stocks tend to be more expensive relative to their earnings or assets compared with other types of stock. As a result they tend to be more sensitive to changes in their earnings and can be more volatile.           Management Risk. The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.           Market Risk. The prices of and the income generated by the Fund’s securities may decline in response to, among other things, investor sentiment, general economic and market conditions, regional or global instability, and currency and interest rate fluctuations.           Small- and Mid-Capitalization Risks. Stocks of small and mid-sized companies tend to be more vulnerable to adverse developments and may have little or no operating history or track record of success, and limited product lines, markets, management and financial resources. The securities of small and mid-sized companies may be more volatile due to less market interest and less publicly available information about the issuer. They also may be illiquid or restricted as to resale, or may trade less frequently and in smaller volumes, all of which may cause difficulty when establishing or closing a position at a desirable price.
Risk Lose Money [Text]	rr_RiskLoseMoney	As with any mutual fund investment, loss of money is a risk of investing.
Risk Not Insured Depository Institution [Text]	rr_RiskNotInsuredDepositoryInstitution	An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	Performance Information
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	The bar chart and performance table provide an indication of the risks of investing in the Fund. The bar chart shows changes in the performance of the Fund from year to year as of December 31. The performance table compares the Fund’s performance to that of a broad-based securities market benchmark, a style specific benchmark and a peer group benchmark comprised of funds with investment objectives and strategies similar to the Fund. The Fund’s past performance (before and after taxes) is not necessarily an indication of its future performance. Updated performance information is available on the Fund’s website at www.invesco.com/us.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	The bar chart and performance table provide an indication of the risks of investing in the Fund. The bar chart shows changes in the performance of the Fund from year to year as of December 31. The performance table compares the Fund’s performance to that of a broad-based securities market benchmark, a style specific benchmark and a peer group benchmark comprised of funds with investment objectives and strategies similar to the Fund.
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	www.invesco.com/us
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	The Fund’s past performance (before and after taxes) is not necessarily an indication of its future performance.
Bar Chart [Heading]	rr_BarChartHeading	Annual Total Returns
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Institutional Class shares year-to-date (ended March 31, 2012): 13.99% Best Quarter (ended September 30, 2009): 20.45% Worst Quarter (ended December 31, 2008): -27.61%
Performance Table Heading	rr_PerformanceTableHeading	Average Annual Total Returns (for the periods ended December 31, 2011)
Performance Table Uses Highest Federal Rate	rr_PerformanceTableUsesHighestFederalRate	After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred	rr_PerformanceTableNotRelevantToTaxDeferred	Actual after-tax returns depend on an investor’s tax situation and may differ from those shown, and after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangement, such as 401(k) plans or individual retirement accounts.
Performance Table Narrative	rr_PerformanceTableNarrativeTextBlock	After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown, and after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangement, such as 401(k) plans or individual retirement accounts.
Class Institutional | Invesco Dynamics Fund | Institutional Class
Risk/Return:	rr_RiskReturnAbstract
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less)	rr_MaximumDeferredSalesChargeOverOther	none
Management Fees	rr_ManagementFeesOverAssets	0.56%
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	none
Other Expenses	rr_OtherExpensesOverAssets	0.16%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	0.72%
1 Year	rr_ExpenseExampleYear01	74
3 Years	rr_ExpenseExampleYear03	230
5 Years	rr_ExpenseExampleYear05	401
10 Years	rr_ExpenseExampleYear10	894
2002	rr_AnnualReturn2002	(32.75%)
2003	rr_AnnualReturn2003	38.75%
2004	rr_AnnualReturn2004	12.52%
2005	rr_AnnualReturn2005	10.89%
2006	rr_AnnualReturn2006	17.02%
2007	rr_AnnualReturn2007	12.75%
2008	rr_AnnualReturn2008	(46.87%)
2009	rr_AnnualReturn2009	43.65%
2010	rr_AnnualReturn2010	23.99%
2011	rr_AnnualReturn2011	(3.99%)
Year to Date Return, Label	rr_YearToDateReturnLabel	Institutional Class shares year-to-date
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Mar. 31, 2012
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	13.99%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Best Quarter
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Sep. 30, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	20.45%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Worst Quarter
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2008
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(27.61%)
1 Year	rr_AverageAnnualReturnYear01	(3.99%)
5 Years	rr_AverageAnnualReturnYear05	0.48%
10 Years	rr_AverageAnnualReturnYear10	3.39%
Inception Date	rr_AverageAnnualReturnInceptionDate	May 22, 2000
Class Institutional | Return After Taxes on Distributions | Invesco Dynamics Fund | Institutional Class
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	(4.92%)
5 Years	rr_AverageAnnualReturnYear05	0.29%
10 Years	rr_AverageAnnualReturnYear10	3.29%
Inception Date	rr_AverageAnnualReturnInceptionDate	May 22, 2000
Class Institutional | Return After Taxes on Distributions and Sale of Fund Shares | Invesco Dynamics Fund | Institutional Class
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	(2.50%)
5 Years	rr_AverageAnnualReturnYear05	0.31%
10 Years	rr_AverageAnnualReturnYear10	2.89%
Inception Date	rr_AverageAnnualReturnInceptionDate	May 22, 2000
Class Institutional | S&P 500 Index (reflects no deduction for fees, expenses or taxes) | Invesco Dynamics Fund
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	2.09%
5 Years	rr_AverageAnnualReturnYear05	(0.25%)
10 Years	rr_AverageAnnualReturnYear10	2.92%
Class Institutional | Russell Midcap Growth Index (reflects no deduction for fees, expenses or taxes) | Invesco Dynamics Fund
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	(1.65%)
5 Years	rr_AverageAnnualReturnYear05	2.44%
10 Years	rr_AverageAnnualReturnYear10	5.29%
Class Institutional | Lipper Mid-Cap Growth Funds Index | Invesco Dynamics Fund
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	(5.30%)
5 Years	rr_AverageAnnualReturnYear05	2.89%
10 Years	rr_AverageAnnualReturnYear10	4.48%