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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Document Type dei_DocumentType Other
Document Period End Date dei_DocumentPeriodEndDate Feb. 28, 2011
Registrant Name dei_EntityRegistrantName AIM INVESTMENT SECURITIES FUNDS (INVESCO INVESTMENT SECURITIES FUNDS)
Central Index Key dei_EntityCentralIndexKey 0000842790
Amendment Flag dei_AmendmentFlag false
Document Creation Date dei_DocumentCreationDate Dec. 16, 2011
Document Effective Date dei_DocumentEffectiveDate Dec. 16, 2011
Prospectus Date rr_ProspectusDate Jun. 28, 2011
Invesco Short Term Bond Fund | Summary - Invesco Short Term Bond Fund, Class A, C, R And Y
  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] aimisf842790_SupplementTextBlock

Statutory Prospectus Supplement dated December 16, 2011

The purpose of this mailing is to provide you with changes to the current Statutory Prospectus for Class A, C, R and Y shares of the Fund listed below:

Invesco Short Term Bond Fund
Supplement Strategy Narrative [Text Block] aimisf842790_SupplementStrategyNarrativeTextBlock

Effective March 1, 2012, the following information replaces in its entirety the fourth paragraph appearing under the heading “Fund Summary — Principal Investment Strategies of the Fund”:

“The Fund may invest up to 25% of its total assets in foreign securities. The Fund may also invest in securities, whether or not considered foreign securities, which carry foreign credit exposure. The Fund may also invest up to 25% of its total assets in securities of issuers located in developing markets. The Fund may only invest in foreign securities denominated in U.S. dollars.”

Effective March 1, 2012, the following information is added as a new fifth paragraph appearing under the heading “Fund Summary — Principal Investment Strategies of the Fund”:

“The Fund may invest up to 20% if its total assets in high yield debt securities (commonly known as “junk bonds”).”
Supplement Risk Narrative [Text Block] aimisf842790_SupplementRiskNarrativeTextBlock

Effective March 1, 2012, the following information is added underneath the last risk appearing under the heading “Fund Summary — Principal Risks of Investing in the Fund”:

“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.

Developing Markets Securities Risk. Securities issued by foreign companies and governments located in developing 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.”
Invesco Short Term Bond Fund | Summary - Invesco Short Term Bond Fund, Class Institutional
  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] aimisf842790_SupplementTextBlock

Statutory Prospectus Supplement dated December 16, 2011

The purpose of this mailing is to provide you with changes to the current Statutory Prospectus for Institutional Class shares of the Funds listed below:

Invesco Dynamics Fund

Invesco Global Real Estate Fund

Invesco High Yield Fund

Invesco Limited Maturity Treasury Fund

Invesco Money Market Fund

Invesco Real Estate Fund

Invesco Short Term Bond Fund

Invesco U.S. Government Fund
Supplement Strategy Narrative [Text Block] aimisf842790_SupplementStrategyNarrativeTextBlock

Effective March 1, 2012, the following information replaces in its entirety the fourth paragraph appearing under the heading “Fund Summaries — Invesco Short Term Bond Fund - Principal Investment Strategies of the Fund”:

“The Fund may invest up to 25% of its total assets in foreign securities. The Fund may also invest in securities, whether or not considered foreign securities, which carry foreign credit exposure. The Fund may also invest up to 25% of its total assets in securities of issuers located in developing markets. The Fund may only invest in foreign securities denominated in U.S. dollars.”

Effective March 1, 2012, the following information is added as a new fifth paragraph appearing under the heading “Fund Summaries — Invesco Short Term Bond Fund — Principal Investment Strategies of the Fund”:

“The Fund may invest up to 20% if its total assets in high yield debt securities (commonly known as “junk bonds”).”
Supplement Risk Narrative [Text Block] aimisf842790_SupplementRiskNarrativeTextBlock

Effective March 1, 2012, the following information is added underneath the last risk appearing under the heading “Fund Summaries — Invesco Short Term Bond Fund - Principal Risks of Investing in the Fund”:

“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.

Developing Markets Securities Risk. Securities issued by foreign companies and governments located in developing 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.”
Invesco Van Kampen Corporate Bond Fund | Summary - Invesco Van Kampen Corporate Bond Fund, Class A, B, C, R And Y
  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] aimisf842790_SupplementTextBlock

Statutory Prospectus Supplement dated December 16, 2011

The purpose of this mailing is to provide you with changes to the current Statutory Prospectus for Class A, B, C, R and Y shares of the Fund listed below:

Invesco Van Kampen Corporate Bond Fund
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Supplement Average Annual Total Returns [Text Block] aimisf842790_SupplementAverageAnnualTotalReturnsTextBlock The following information replaces in its entirety the information appearing under the heading “Fund Summary — Performance Information — Average Annual Total Returns”:
Caption rr_AverageAnnualReturnCaption “Average Annual Total Returns (for the periods ended December 31, 2010)
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. After —tax returns are shown for Class A shares only and after-tax returns for other classes will vary.”
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 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.”
Invesco Van Kampen Corporate Bond Fund | Summary - Invesco Van Kampen Corporate Bond Fund, Class Institutional
  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] aimisf842790_SupplementTextBlock

Statutory Prospectus Supplement dated December 16, 2011

The purpose of this mailing is to provide you with changes to the current Statutory Prospectus for Institutional Class shares of the Fund listed below:

Invesco Van Kampen Corporate Bond Fund
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Supplement Average Annual Total Returns [Text Block] aimisf842790_SupplementAverageAnnualTotalReturnsTextBlock The following information replaces in its entirety the information appearing under the heading “Fund Summary — Performance Information — Average Annual Total Returns”:
Caption rr_AverageAnnualReturnCaption “Average Annual Total Returns (for the periods ended December 31, 2010)
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.”
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.
Invesco Van Kampen Corporate Bond Fund | Return Before Taxes | Class A, Invesco Van Kampen Corporate Bond Fund
  
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Column rr_AverageAnnualReturnColumnName Class A shares: Inception (09/23/1971)
Label rr_AverageAnnualReturnLabel Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 3.61%
5 Years rr_AverageAnnualReturnYear05 4.58%
10 Years rr_AverageAnnualReturnYear10 5.27%
Since Inception rr_AverageAnnualReturnSinceInception   
Inception Date rr_AverageAnnualReturnInceptionDate Sep. 23, 1971
Invesco Van Kampen Corporate Bond Fund | Return Before Taxes | Class B, Invesco Van Kampen Corporate Bond Fund
  
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Column rr_AverageAnnualReturnColumnName Class B shares: Inception (09/28/1992)
1 Year rr_AverageAnnualReturnYear01 3.20%
5 Years rr_AverageAnnualReturnYear05 4.64%
10 Years rr_AverageAnnualReturnYear10 5.17%
Since Inception rr_AverageAnnualReturnSinceInception   
Inception Date rr_AverageAnnualReturnInceptionDate Sep. 28, 1992
Invesco Van Kampen Corporate Bond Fund | Return Before Taxes | Class C, Invesco Van Kampen Corporate Bond Fund
  
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Column rr_AverageAnnualReturnColumnName Class C shares: Inception (08/30/1993)
1 Year rr_AverageAnnualReturnYear01 7.02%
5 Years rr_AverageAnnualReturnYear05 4.87%
10 Years rr_AverageAnnualReturnYear10 5.04%
Since Inception rr_AverageAnnualReturnSinceInception   
Inception Date rr_AverageAnnualReturnInceptionDate Aug. 30, 1993
Invesco Van Kampen Corporate Bond Fund | Return Before Taxes | Class R, Invesco Van Kampen Corporate Bond Fund
  
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Column rr_AverageAnnualReturnColumnName Class R shares: Inception (06/06/2011) [1]
1 Year rr_AverageAnnualReturnYear01 8.43%
5 Years rr_AverageAnnualReturnYear05 5.34%
10 Years rr_AverageAnnualReturnYear10 5.52%
Since Inception rr_AverageAnnualReturnSinceInception   
Inception Date rr_AverageAnnualReturnInceptionDate Jun. 06, 2011
Invesco Van Kampen Corporate Bond Fund | Return Before Taxes | Class Y, Invesco Van Kampen Corporate Bond Fund
  
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Column rr_AverageAnnualReturnColumnName Class Y shares: Inception (08/12/2005)
1 Year rr_AverageAnnualReturnYear01 9.29%
5 Years rr_AverageAnnualReturnYear05 5.90%
10 Years rr_AverageAnnualReturnYear10   
Since Inception rr_AverageAnnualReturnSinceInception 5.57%
Inception Date rr_AverageAnnualReturnInceptionDate Aug. 12, 2005
Invesco Van Kampen Corporate Bond Fund | Return Before Taxes | Institutional Class, Invesco Van Kampen Corporate Bond Fund
  
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Column rr_AverageAnnualReturnColumnName Institutional Class shares: Inception (06/01/2010) [2]
Label rr_AverageAnnualReturnLabel Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 8.92%
5 Years rr_AverageAnnualReturnYear05 5.65%
10 Years rr_AverageAnnualReturnYear10 5.81%
Inception Date rr_AverageAnnualReturnInceptionDate Jun. 01, 2010
Invesco Van Kampen Corporate Bond Fund | Return After Taxes on Distributions | Class A, Invesco Van Kampen Corporate Bond Fund
  
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Column rr_AverageAnnualReturnColumnName Class A shares: Inception (09/23/1971)
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 1.81%
5 Years rr_AverageAnnualReturnYear05 2.73%
10 Years rr_AverageAnnualReturnYear10 3.28%
Since Inception rr_AverageAnnualReturnSinceInception   
Inception Date rr_AverageAnnualReturnInceptionDate Sep. 23, 1971
Invesco Van Kampen Corporate Bond Fund | Return After Taxes on Distributions | Institutional Class, Invesco Van Kampen Corporate Bond Fund
  
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Column rr_AverageAnnualReturnColumnName Institutional Class shares: Inception (06/01/2010) [2]
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 6.95%
5 Years rr_AverageAnnualReturnYear05 3.76%
10 Years rr_AverageAnnualReturnYear10 3.80%
Inception Date rr_AverageAnnualReturnInceptionDate Jun. 01, 2010
Invesco Van Kampen Corporate Bond Fund | Return After Taxes on Distributions and Sale of Fund Shares | Class A, Invesco Van Kampen Corporate Bond Fund
  
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Column rr_AverageAnnualReturnColumnName Class A shares: Inception (09/23/1971)
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 2.32%
5 Years rr_AverageAnnualReturnYear05 2.79%
10 Years rr_AverageAnnualReturnYear10 3.28%
Since Inception rr_AverageAnnualReturnSinceInception   
Inception Date rr_AverageAnnualReturnInceptionDate Sep. 23, 1971
Invesco Van Kampen Corporate Bond Fund | Return After Taxes on Distributions and Sale of Fund Shares | Institutional Class, Invesco Van Kampen Corporate Bond Fund
  
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Column rr_AverageAnnualReturnColumnName Institutional Class shares: Inception (06/01/2010) [2]
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 5.77%
5 Years rr_AverageAnnualReturnYear05 3.69%
10 Years rr_AverageAnnualReturnYear10 3.75%
Inception Date rr_AverageAnnualReturnInceptionDate Jun. 01, 2010
Invesco Van Kampen Corporate Bond Fund | Barclays Capital U.S. Credit Index
  
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Label rr_AverageAnnualReturnLabel Barclays Capital U.S. Credit Index [3]
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deductions for fees, expenses or taxes)
1 Year rr_AverageAnnualReturnYear01 8.47%
5 Years rr_AverageAnnualReturnYear05 5.98%
10 Years rr_AverageAnnualReturnYear10 6.55%
Since Inception rr_AverageAnnualReturnSinceInception   
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged The Fund has elected to use the Barclays Capital U.S. Credit Index to represent its broad-based securities/style specific market benchmark rather than the Barclays Capital US Corp INV Bd Index because the Barclays Capital U.S. Credit Index more closely reflects the performance of the types of securities in which the Fund invests.
Invesco Van Kampen Corporate Bond Fund | Barclays Capital US Corp INV Bd Index
  
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Label rr_AverageAnnualReturnLabel Barclays Capital US Corp INV Bd Index [3]
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deductions for fees, expenses or taxes)
1 Year rr_AverageAnnualReturnYear01 9.00%
5 Years rr_AverageAnnualReturnYear05 6.05%
10 Years rr_AverageAnnualReturnYear10 6.57%
Since Inception rr_AverageAnnualReturnSinceInception   
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged The Fund has elected to use the Barclays Capital U.S. Credit Index to represent its broad-based securities/style specific market benchmark rather than the Barclays Capital US Corp INV Bd Index because the Barclays Capital U.S. Credit Index more closely reflects the performance of the types of securities in which the Fund invests.
Invesco Van Kampen Corporate Bond Fund | Lipper BBB Rated Funds Index
  
Average Annual Total Returns rr_AverageAnnualReturnAbstract  
Label rr_AverageAnnualReturnLabel Lipper BBB Rated Funds Index
1 Year rr_AverageAnnualReturnYear01 10.46%
5 Years rr_AverageAnnualReturnYear05 5.57%
10 Years rr_AverageAnnualReturnYear10 5.96%
Since Inception rr_AverageAnnualReturnSinceInception   
[1] Class R shares' performance shown is that of Class A shares of the Fund's (and the predecessor fund's) 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] 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.
[3] The Fund has elected to use the Barclays Capital U.S. Credit Index to represent its broad-based securities/style specific market benchmark rather than the Barclays Capital US Corp INV Bd Index because the Barclays Capital U.S. Credit Index more closely reflects the performance of the types of securities in which the Fund invests.