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 Van Kampen Corporate Bond Fund
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	Fund Summary - INVESCO VAN KAMPEN CORPORATE BOND FUND
Objective [Heading]	rr_ObjectiveHeading	Investment Objective(s)
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The Fund’s primary investment objective is to seek to provide current income with preservation of capital.
Objective, Secondary [Text Block]	rr_ObjectiveSecondaryTextBlock	Capital appreciation is a secondary objective that is sought only when consistent with the Fund’s primary investment objective.
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 69% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	69.00%
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’s investment adviser, Invesco Advisers, Inc. (the Adviser), seeks to achieve the Fund’s investment objectives by investing primarily in a portfolio of corporate debt securities. The Fund invests, under normal circumstances, at least 80% of its net assets at the time of investment (plus any borrowings for investment purposes) in corporate bonds. For these purposes a corporate bond is defined as any corporate debt security with an original term to maturity of greater than one year.           The Fund utilizes active duration and yield curve positioning for risk management and for generating alpha versus its benchmark. Duration is a measure of volatility expressed in years and represents the anticipated percent change in a bond’s price at a single point in time for a 1% change in yield. As duration increases, volatility increases as applicable interest rates change.           The portfolio managers utilize an appropriate benchmark index in structuring the portfolio. The portfolio managers decide on appropriate risk factors such as sector and issuer weightings and duration relative to that benchmark. The portfolio managers then employ proprietary technology to calculate appropriate position sizes for each of these risk factors. In doing so, the portfolio managers consider recommendations from a globally interconnected team of specialist decision makers in positioning the Fund to generate alpha (specific factors affecting the return on investments in excess of the benchmark).           The portfolio managers generally rely upon a team of market-specific specialists for trade execution and for assistance in determining the most efficient way (in terms of cost-efficiency and security selection) to implement those recommendations. Although a variety of specialists provide input in the management of the Fund, the portfolio managers retain responsibility for ensuring the Fund is positioned appropriately in terms of risk exposures and position sizes.           Specialist decision makers employ a bottom-up approach to recommend larger or smaller exposure to specific risk factors. In general, specialists will look for attractive risk-reward opportunities and securities that best enable the Fund to pursue those opportunities. The portfolio managers rely on these decision makers and market specific specialists for adjusting the Fund’s risk exposures and security selection on a real-time basis using proprietary communication technology. Portfolio managers retain discretion for deciding how risk positions are implemented. Investment professionals that factor in economic and credit-related fundamentals, market supply and demand, market dislocations and situation-specific opportunities decide to purchase or sell securities using their relative value considerations. The purchase or sale of securities may be related to a decision to alter the Fund’s macro risk exposure (e.g. duration, yield, curve positioning, sector exposure), a need to limit or reduce the Fund’s exposure to a particular security or issuer, degradation of an issuer’s credit quality, or general liquidity needs of the Fund.           Types of Securities. Under normal market conditions, the Fund invests primarily in corporate debt securities with original maturities of more than one year. The Fund may invest up to 20% of its total assets in convertible securities and up to 10% of its total assets in preferred stocks. In addition, a portion or all of the Fund’s total assets may be invested in securities issued by foreign governments or corporations; provided, however, that the Fund may not invest more than 30% of its total assets in non-U.S. dollar denominated securities. Debt securities purchased by the Fund may include issuer call provisions. The Fund may from time to time invest in derivative instruments such as futures contracts and swap agreements, including but not limited to interest rate futures, credit default swaps, and engage in mortgage dollar roll transactions, a form of repurchase agreement activity in the to-be-announced (TBA) market for agency mortgage-backed securities (MBS). These strategies are implemented within the risk profile of the guidelines set forth in the prospectus. The Fund may engage in dollar roll transactions to enhance the Fund’s return on cash.           Quality Levels. Under normal market conditions, between 60% to 100% of the Fund’s total assets are invested in investment grade securities, which are securities rated Baa or higher by Moody’s Investors Service, Inc. (Moody’s) or BBB or higher by Standard & Poor’s (S&P) at the time they are purchased, securities issued or guaranteed by the U.S. government, its agencies or instrumentalities, commercial paper rated Prime by Moody’s or A by S&P and cash and cash equivalents.           Up to 40% of the Fund’s total assets may be invested in securities rated Ba by Moody’s or BB by S&P at the time of purchase. No more than 20% of the Fund’s total assets may be invested in securities rated B or lower by Moody’s or S&P, or which are unrated, although it is the Fund’s current policy not to buy any securities rated below B or unrated securities judged by the Adviser to be of comparable quality. Securities rated Ba or lower by Moody’s or BB or lower by S&P or unrated securities of comparable quality are commonly referred to as junk bonds and involve greater risks than investments in higher-grade 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 government agency. The risks associated with an investment in the Fund can increase during times of significant market volatility. The principle risks of investing in the Fund are:           Credit Risk. The issuer of instruments in which the Fund invests may be unable to meet interest and/or principal payments, thereby causing its instruments to decrease in value and lowering the issuer’s credit rating.            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.            Interest Rate Risk. Interest rate risk refers to the risk that bond prices generally fall as interest rates rise; conversely, bond prices generally rise as interest rates fall. Specific bonds differ in their sensitivity to changes in interest rates depending on their individual characteristics, including duration.           Management Risk. The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.           Income Risk. The income you receive from the Fund is based primarily on prevailing interest rates, which can vary widely over the short- and long-term. If interest rates drop, your income from the Fund may drop as well.           Preferred Securities Risk. There are special risks associated with investing in preferred securities. Preferred securities may include provisions that permit the issuer, in its discretion, to defer or omit distributions for a certain period of time. If the Fund owns a security that is deferring or omitting its distributions, the Fund may be required to report the distribution on its tax returns, even though it may not have received this income. Further, preferred securities may lose substantial value due to the omission or deferment of dividend payments.           Call Risk. If interest rates fall, it is possible that issuers of debt securities with high interest rates will prepay or call their securities before their maturity dates. In this event, the proceeds from the called securities would likely be reinvested by the Fund in securities bearing the new, lower interest rates, resulting in a possible decline in the Fund’s income and distributions to shareholders.           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.           Derivatives Risk. The performance of derivative instruments is tied to the performance of an underlying currency, security, index or other instrument. In addition to risks relating to their underlying instruments, the use of derivatives may include other, possibly greater, risks. Derivatives involve costs, may be volatile, and may involve a small initial investment relative to the risk assumed. Risks associated with the use of derivatives include counterparty, leverage, correlation, liquidity, tax, market, interest rate and management risks. Derivatives may also be more difficult to purchase, sell or value than other investments. The Fund may lose more than the cash amount invested on investments in derivatives.           Investors should bear in mind that, while the Fund intends to use derivative strategies, it is not obligated to actively engage in these transactions, generally or in any particular kind of derivative, if the investment manager elects not to do so due to availability, cost, market conditions or other factors.           Developing /Emerging Markets Securities Risk. Securities issued by foreign companies and governments located in developing/emerging countries may be affected more negatively by inflation, devaluation of their currencies, higher transaction costs, delays in settlement, adverse political developments, the introduction of capital controls, withholding taxes, nationalization of private assets, expropriation, social unrest, war or lack of timely information than those in developed countries.           Dollar Roll Transaction Risk. Dollar roll transactions involve the risk that the market value and yield of the securities retained by the Fund may decline below the price of the mortgage-related securities sold by the Fund that it is obligated to repurchase.           Convertible Securities Risk. The Fund may own convertible securities, the value of which may be affected by market interest rates, the risk that the issuer will default, the value of the underlying stock or the right of the issuer to buy back the convertible securities.           High Yield Bond (Junk Bond) Risk. Junk bonds involve a greater risk of default or price changes due to changes in the credit quality of the issuer. The values of junk bonds fluctuate more than those of high-quality bonds in response to company, political, regulatory or economic developments. Values of junk bonds can decline significantly over short periods of time.
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 government 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 and Van Kampen Corporate Bond Fund’s (the predecessor fund) performance to that of a broad-based securities/style specific benchmark and a peer group benchmark comprised of funds with investment objectives and strategies similar to those of the Fund. The Fund’s and the predecessor fund’s past performance (before and after taxes) is not necessarily an indication of its future performance.           The returns shown prior to June 1, 2010 are those of the Class A shares of the predecessor fund. The predecessor fund was advised by Van Kampen Asset Management. Institutional Class shares’ returns of the Fund will be different from the predecessor Fund as they have different expenses.           Updated performance information is available on the Fund’s Web site 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 and Van Kampen Corporate Bond Fund’s (the predecessor fund) performance to that of a broad-based securities/style specific benchmark and a peer group benchmark comprised of funds with investment objectives and strategies similar to those of 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 and the predecessor 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): 3.26% Best Quarter (ended December 31, 2011): 2.12% Worst Quarter (ended September 30, 2011): (0.88)%
Performance Table Heading	rr_PerformanceTableHeading	Average Annual Total Returns (for the periods ended December 31, 2011)
Performance Table Market Index Changed	rr_PerformanceTableMarketIndexChanged	The Fund has elected to use the Barclays U.S. Credit Index to represent its broad-based securities/style specific market benchmark rather than the Barclays U.S. Corp Inv Bd Index because the Barclays U.S. Credit Index more closely reflects the performance of the types of securities in which the Fund invests.
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 arrangements, 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 arrangements, such as 401(k) plans or individual retirement accounts.
Class Institutional | Institutional Class | Invesco Van Kampen Corporate Bond Fund
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	0.39%
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	none
Other Expenses	rr_OtherExpensesOverAssets	0.08%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	0.47%
1 Year	rr_ExpenseExampleYear01	48
3 Years	rr_ExpenseExampleYear03	151
5 Years	rr_ExpenseExampleYear05	263
10 Years	rr_ExpenseExampleYear10	591
2011	rr_AnnualReturn2011	6.44%
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	3.26%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Best Quarter
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Dec. 31, 2011
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	2.12%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Worst Quarter
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Sep. 30, 2011
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(0.88%)
1 Year	rr_AverageAnnualReturnYear01	6.44%	[1]
5 Years	rr_AverageAnnualReturnYear05	6.17%	[1]
10 Years	rr_AverageAnnualReturnYear10	5.52%	[1]
Inception Date	rr_AverageAnnualReturnInceptionDate	Jun. 01, 2010
Class Institutional | Return After Taxes on Distributions | Institutional Class | Invesco Van Kampen Corporate Bond Fund
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	4.68%	[1]
5 Years	rr_AverageAnnualReturnYear05	4.26%	[1]
10 Years	rr_AverageAnnualReturnYear10	3.60%	[1]
Inception Date	rr_AverageAnnualReturnInceptionDate	Jun. 01, 2010
Class Institutional | Return After Taxes on Distributions and Sale of Fund Shares | Institutional Class | Invesco Van Kampen Corporate Bond Fund
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	4.16%	[1]
5 Years	rr_AverageAnnualReturnYear05	4.13%	[1]
10 Years	rr_AverageAnnualReturnYear10	3.56%	[1]
Inception Date	rr_AverageAnnualReturnInceptionDate	Jun. 01, 2010
Class Institutional | Barclays U.S. Credit Index (reflects no deductions for fees, expenses or taxes) | Invesco Van Kampen Corporate Bond Fund
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	8.35%	[2]
5 Years	rr_AverageAnnualReturnYear05	6.80%	[2]
10 Years	rr_AverageAnnualReturnYear10	6.35%	[2]
Class Institutional | Barclays U.S. Corp Inv Bd Index (reflects no deductions for fees, expenses or taxes) | Invesco Van Kampen Corporate Bond Fund
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	8.15%	[2]
5 Years	rr_AverageAnnualReturnYear05	6.82%	[2]
10 Years	rr_AverageAnnualReturnYear10	6.36%	[2]
Class Institutional | Lipper BBB Rated Funds Index | Invesco Van Kampen Corporate Bond Fund
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	8.63%
5 Years	rr_AverageAnnualReturnYear05	6.24%
10 Years	rr_AverageAnnualReturnYear10	6.08%

[1] Institutional Class shares' performance shown prior to the inception date is that of the Fund's (and the predecessor fund's) Class A shares and includes the 12b-1 fees applicable to Class A shares. Class A shares' performance reflects any applicable fee waivers and/or expense reimbursement. The inception date of the predecessor fund's Class A shares is September 23, 1971.

[2] The Fund has elected to use the Barclays U.S. Credit Index to represent its broad-based securities/style specific market benchmark rather than the Barclays U.S. Corp Inv Bd Index because the Barclays U.S. Credit Index more closely reflects the performance of the types of securities in which the Fund invests.