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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName AIM INVESTMENT SECURITIES FUNDS (INVESCO INVESTMENT SECURITIES FUNDS)
Prospectus Date rr_ProspectusDate Jun. 28, 2012
Class A, B, C, R, Y And Investor | Invesco U.S. Government Fund
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Fund Summary - Invesco U.S. Government Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective(s)
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund’s investment objective is total return, comprised of current income and capital appreciation.
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.

          You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the Invesco Funds. More information about these and other discounts is available from your financial professional and in the section “Shareholder Account Information-Initial Sales Charges (Class A Shares Only)” on page A-3 of the prospectus and the section “Purchase, Redemption and Pricing of Shares-Purchase and Redemption of Shares” on page L-1 of the statement of additional information (SAI).
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 157% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 157.00%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the Invesco Funds.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount 50,000
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:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption You would pay the following expenses if you did not redeem your shares:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies of the Fund
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock The Fund invests under normal circumstances at least 80% of its net assets (plus any borrowings for investment purposes) in debt securities issued, guaranteed or otherwise backed by the U.S. Government or its agencies and instrumentalities. These securities include: (1) U.S. Treasury obligations and (2) obligations issued or guaranteed by U.S. Government agencies and instrumentalities and supported by (a) the full faith and credit of the U.S. Treasury, (b) the right of the issuer to borrow from the U.S. Treasury, or (c) the credit of the agency or instrumentality. The principal type of fixed income securities purchased by the Fund are callable bonds that can be redeemed by the issuer prior to their stated maturity, bullet-maturity debt bonds with a stated maturity date; mortgage-backed securities (MBS) consisting of interests in underlying mortgages with maturities of up to thirty years, and Treasury and agency holdings. The Fund may also invest in derivative instruments such as treasury futures and options on treasury futures. The Fund may enter into reverse repurchase agreements. The Fund often uses Treasury futures and dollar rolls transactions to gain exposure to the Treasury and agency MBS markets while deploying Fund assets in other securities.

          In complying with the 80% investment requirement, the Fund may include synthetic securities that have economic characteristics similar to the Fund’s direct investments that are counted toward the 80% investment requirement.

          The Fund invests in securities of all maturities, but will maintain a weighted average effective maturity for the portfolio of between three and ten years.

          The Fund may utilize derivative instruments, specifically futures contracts. The Fund will invest in futures contracts to seek exposure to certain asset classes. A futures contract is a standardized agreement between two parties to buy or sell a specific quantity of an underlying instrument at a specific price at a specific future time. The value of the futures contract tends to increase and decrease in tandem with the value of the underlying instrument. Futures contracts are bilateral agreements, with both the purchaser and the seller equally obligated to complete the transaction. Depending on the terms of the particular contract, futures contracts are settled through purchasing an offsetting contract, by physical delivery of the underlying instrument on the settlement date or by payment of a cash settlement amount on the settlement date.

          The portfolio managers utilize an appropriate benchmark index in structuring the portfolio. The portfolio managers then decide on risk factors to use in managing the Fund relative to that benchmark. In doing so, the portfolio managers consider recommendations from a team of independent specialists 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 different team of specialists for trade execution and for assistance in determining the most efficient way (in terms of cost-efficiency and 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. The portfolio managers rely on the specialists for adjusting the Fund’s risk exposures and security selection. Decisions to purchase or sell securities are determined by the relative value considerations of the investment professionals that factor in economic and credit-related fundamentals, market supply and demand, market dislocations and situation-specific opportunities. 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.

          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.

          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 may 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.

          Dollar Roll Transactions 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.

          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.

          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.

          Mortgage- and Asset-Backed Securities Risk. The Fund may invest in mortgage- and asset-backed securities that are subject to prepayment or call risk, which is the risk that the borrower’s payments may be received earlier or later than expected due to changes in prepayment rates on underlying loans. Faster prepayments often happen when interest rates are falling. As a result, the Fund may reinvest these early payments at lower interest rates, thereby reducing the Fund’s income. Conversely, when interest rates rise, prepayments may happen more slowly, causing the security to lengthen in duration. Longer duration securities tend to be more volatile. Securities may be prepaid at a price less than the original purchase value. An unexpectedly high rate of defaults on the mortgages held by a mortgage pool may adversely affect the value of mortgage-backed securities and could result in losses to the Fund. The risk of such defaults is generally higher in the case of mortgage pools that include subprime mortgages. Subprime mortgages refer to loans made to borrowers with weakened credit histories or with lower capacity to make timely payments on their mortgages.

          Reinvestment Risk. Reinvestment risk is the risk that a bond’s cash flows (coupon income and principal repayment) will be reinvested at an interest rate below that on the original bond.

          Reverse Repurchase Agreement Risk. Reverse repurchase agreements involve the risk that the market value of securities to be repurchased may decline below the repurchase price or that the other party may default on its obligation, resulting in delays, additional costs or the restriction of proceeds from the sale.

          Synthetic Securities Risk. Fluctuations in the values of synthetic securities may not correlate perfectly with the instruments they are designed to replicate. Synthetic securities may be subject to interest rate changes, market price fluctuations, counterparty risk and liquidity risk.

          U.S. Government Obligations Risk. The Fund may invest in obligations issued by U.S. Government agencies and instrumentalities that may receive varying levels of support from the government, which could affect the Fund’s ability to recover should they default.
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 Narrative [Text Block] rr_BarChartNarrativeTextBlock The bar chart does not reflect sales loads. If it did, the annual total returns shown would be lower.
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads The bar chart does not reflect sales loads. If it did, the annual total returns shown would be lower.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock Class A shares year-to-date (ended March 31, 2012): -0.64%
Best Quarter (ended December 31, 2008): 7.22%
Worst Quarter (ended December 31, 2010): -2.11%
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 arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Class A shares only and after-tax returns for other classes will vary.
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. After-tax returns are shown for Class A shares only and after-tax returns for other classes will vary.
Class A, B, C, R, Y And Investor | Invesco U.S. Government Fund | Class A
  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 4.75%
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 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.28%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.92%
1 Year rr_ExpenseExampleYear01 564
3 Years rr_ExpenseExampleYear03 754
5 Years rr_ExpenseExampleYear05 960
10 Years rr_ExpenseExampleYear10 1,553
1 Year rr_ExpenseExampleNoRedemptionYear01 564
3 Years rr_ExpenseExampleNoRedemptionYear03 754
5 Years rr_ExpenseExampleNoRedemptionYear05 960
10 Years rr_ExpenseExampleNoRedemptionYear10 1,553
2002 rr_AnnualReturn2002 10.00%
2003 rr_AnnualReturn2003 1.31%
2004 rr_AnnualReturn2004 2.40%
2005 rr_AnnualReturn2005 1.55%
2006 rr_AnnualReturn2006 3.18%
2007 rr_AnnualReturn2007 6.06%
2008 rr_AnnualReturn2008 11.63%
2009 rr_AnnualReturn2009 0.00%
2010 rr_AnnualReturn2010 5.34%
2011 rr_AnnualReturn2011 7.23%
Year to Date Return, Label rr_YearToDateReturnLabel Class A shares year-to-date
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Mar. 31, 2012
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn (0.64%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2008
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 7.22%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2010
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (2.11%)
1 Year rr_AverageAnnualReturnYear01 2.10%
5 Years rr_AverageAnnualReturnYear05 4.95%
10 Years rr_AverageAnnualReturnYear10 4.30%
Inception Date rr_AverageAnnualReturnInceptionDate Apr. 28, 1987
Class A, B, C, R, Y And Investor | Invesco U.S. Government Fund | Class B
  
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 5.00%
Management Fees rr_ManagementFeesOverAssets 0.39%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses rr_OtherExpensesOverAssets 0.28%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.67%
1 Year rr_ExpenseExampleYear01 670
3 Years rr_ExpenseExampleYear03 826
5 Years rr_ExpenseExampleYear05 1,107
10 Years rr_ExpenseExampleYear10 1,777
1 Year rr_ExpenseExampleNoRedemptionYear01 170
3 Years rr_ExpenseExampleNoRedemptionYear03 526
5 Years rr_ExpenseExampleNoRedemptionYear05 907
10 Years rr_ExpenseExampleNoRedemptionYear10 1,777
1 Year rr_AverageAnnualReturnYear01 1.53%
5 Years rr_AverageAnnualReturnYear05 4.89%
10 Years rr_AverageAnnualReturnYear10 4.18%
Inception Date rr_AverageAnnualReturnInceptionDate Sep. 07, 1993
Class A, B, C, R, Y And Investor | Invesco U.S. Government Fund | Class C
  
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 1.00%
Management Fees rr_ManagementFeesOverAssets 0.39%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses rr_OtherExpensesOverAssets 0.28%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.67%
1 Year rr_ExpenseExampleYear01 270
3 Years rr_ExpenseExampleYear03 526
5 Years rr_ExpenseExampleYear05 907
10 Years rr_ExpenseExampleYear10 1,976
1 Year rr_ExpenseExampleNoRedemptionYear01 170
3 Years rr_ExpenseExampleNoRedemptionYear03 526
5 Years rr_ExpenseExampleNoRedemptionYear05 907
10 Years rr_ExpenseExampleNoRedemptionYear10 1,976
1 Year rr_AverageAnnualReturnYear01 5.55%
5 Years rr_AverageAnnualReturnYear05 5.22%
10 Years rr_AverageAnnualReturnYear10 4.04%
Inception Date rr_AverageAnnualReturnInceptionDate Aug. 04, 1997
Class A, B, C, R, Y And Investor | Invesco U.S. Government Fund | Class R
  
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 0.50%
Other Expenses rr_OtherExpensesOverAssets 0.28%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.17%
1 Year rr_ExpenseExampleYear01 119
3 Years rr_ExpenseExampleYear03 372
5 Years rr_ExpenseExampleYear05 644
10 Years rr_ExpenseExampleYear10 1,420
1 Year rr_ExpenseExampleNoRedemptionYear01 119
3 Years rr_ExpenseExampleNoRedemptionYear03 372
5 Years rr_ExpenseExampleNoRedemptionYear05 644
10 Years rr_ExpenseExampleNoRedemptionYear10 1,420
1 Year rr_AverageAnnualReturnYear01 6.95% [1]
5 Years rr_AverageAnnualReturnYear05 5.72% [1]
10 Years rr_AverageAnnualReturnYear10 4.56% [1]
Inception Date rr_AverageAnnualReturnInceptionDate Jun. 03, 2002
Class A, B, C, R, Y And Investor | Invesco U.S. Government Fund | Class Y
  
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 0.28%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.67%
1 Year rr_ExpenseExampleYear01 68
3 Years rr_ExpenseExampleYear03 214
5 Years rr_ExpenseExampleYear05 373
10 Years rr_ExpenseExampleYear10 835
1 Year rr_ExpenseExampleNoRedemptionYear01 68
3 Years rr_ExpenseExampleNoRedemptionYear03 214
5 Years rr_ExpenseExampleNoRedemptionYear05 373
10 Years rr_ExpenseExampleNoRedemptionYear10 835
1 Year rr_AverageAnnualReturnYear01 7.72% [2]
5 Years rr_AverageAnnualReturnYear05 6.20% [2]
10 Years rr_AverageAnnualReturnYear10 4.91% [2]
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 03, 2008
Class A, B, C, R, Y And Investor | Invesco U.S. Government Fund | Investor 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 0.39%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.28%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.92%
1 Year rr_ExpenseExampleYear01 94
3 Years rr_ExpenseExampleYear03 293
5 Years rr_ExpenseExampleYear05 509
10 Years rr_ExpenseExampleYear10 1,131
1 Year rr_ExpenseExampleNoRedemptionYear01 94
3 Years rr_ExpenseExampleNoRedemptionYear03 293
5 Years rr_ExpenseExampleNoRedemptionYear05 509
10 Years rr_ExpenseExampleNoRedemptionYear10 1,131
1 Year rr_AverageAnnualReturnYear01 7.22% [2]
5 Years rr_AverageAnnualReturnYear05 6.00% [2]
10 Years rr_AverageAnnualReturnYear10 4.84% [2]
Inception Date rr_AverageAnnualReturnInceptionDate Sep. 30, 2003
Class A, B, C, R, Y And Investor | Return After Taxes on Distributions | Invesco U.S. Government Fund | Class A
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 1.10%
5 Years rr_AverageAnnualReturnYear05 3.49%
10 Years rr_AverageAnnualReturnYear10 2.69%
Inception Date rr_AverageAnnualReturnInceptionDate Apr. 28, 1987
Class A, B, C, R, Y And Investor | Return After Taxes on Distributions and Sale of Fund Shares | Invesco U.S. Government Fund | Class A
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 1.34%
5 Years rr_AverageAnnualReturnYear05 3.36%
10 Years rr_AverageAnnualReturnYear10 2.70%
Inception Date rr_AverageAnnualReturnInceptionDate Apr. 28, 1987
Class A, B, C, R, Y And Investor | Barclays U.S. Aggregate Index (reflects no deduction for fees, expenses or taxes) | Invesco U.S. Government Fund
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 7.84%
5 Years rr_AverageAnnualReturnYear05 6.50%
10 Years rr_AverageAnnualReturnYear10 5.78%
Class A, B, C, R, Y And Investor | Barclays U.S. Government Index (reflects no deduction for fees, expenses or taxes) | Invesco U.S. Government Fund
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 9.02%
5 Years rr_AverageAnnualReturnYear05 6.56%
10 Years rr_AverageAnnualReturnYear10 5.59%
Class A, B, C, R, Y And Investor | Lipper Intermediate U.S. Government Funds Index | Invesco U.S. Government Fund
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 7.95%
5 Years rr_AverageAnnualReturnYear05 6.63%
10 Years rr_AverageAnnualReturnYear10 5.34%
[1] Class R shares' performance shown prior to the inception date is that of Class A shares restated to reflect the higher 12b-1 fees applicable to Class R shares. Class A shares' performance reflects any applicable fee waiver and/or expense reimbursement.
[2] Class Y shares' and Investor Class shares' performance shown prior to the inception date is that of Class A shares and includes the 12b-1 fees applicable to Class A shares. Class A shares' performance reflects any applicable fee waiver and/or expense reimbursement.