Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	OPPENHEIMER INTEGRITY FUNDS
Prospectus Date	rr_ProspectusDate	Feb. 12, 2018
Oppenheimer Preferred Securities and Income Fund
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	The Fund Summary
Objective [Heading]	rr_ObjectiveHeading	Investment Objective.
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The Fund seeks total return.
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 or redeem shares of the Fund. You may qualify for sales charge discounts if you (or you and your spouse) invest, or agree to invest in the future, at least $50,000 in certain funds in the Oppenheimer family of funds. More information about these and other discounts and sales charge waivers is available from your financial professional and in the section “About Your Account” beginning on page 19 of the prospectus, in the appendix to the prospectus titled “Special Sales Charge Arrangements and Waivers” and in the section “How to Buy Shares” beginning on page 45 in the Fund’s Statement of Additional Information.
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)
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	one year from the date of the prospectus
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 the annual fund operating expenses or in the Example, affect the Fund’s performance. Because the Fund has not yet commenced operations, the Fund’s portfolio turnover rate is not available.
Expense Breakpoint Discounts [Text]	rr_ExpenseBreakpointDiscounts	You may qualify for sales charge discounts if you (or you and your spouse) invest, or agree to invest in the future, at least $50,000 in certain funds in the Oppenheimer family of funds.
Expense Breakpoint, Minimum Investment Required [Amount]	rr_ExpenseBreakpointMinimumInvestmentRequiredAmount	$ 50,000
Other Expenses, New Fund, Based on Estimates [Text]	rr_OtherExpensesNewFundBasedOnEstimates	“Other Expenses” are based on estimates for the current fiscal year.
Expense Example [Heading]	rr_ExpenseExampleHeading	Example.
Expense Example Narrative [Text Block]	rr_ExpenseExampleNarrativeTextBlock	The following 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 a class of shares of 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. Any applicable fee waivers and/or expense reimbursements are reflected in the below examples for the first year only. Although your actual costs may be higher or lower, based on these assumptions your expenses would be as follows, whether or not you redeemed your shares:
Strategy [Heading]	rr_StrategyHeading	Principal Investment Strategies.
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	Under normal circumstances, the Fund invests at least 80% of its net assets (plus borrowings for investment purposes) in preferred and other income producing securities. These securities include traditional preferred securities, hybrid preferred securities that have investment and economic characteristics of both preferred stock and debt securities, floating rate preferred securities, corporate debt securities, convertible securities, and contingent capital securities (“CoCos”). The Fund may also invest in certain restricted securities including securities that are only eligible for resale pursuant to Rule 144A under the Securities Act of 1933 (the “Securities Act”) (referred to as Rule 144A Securities) and securities of U.S. and non-U.S. issuers that are issued through private offerings without registration with the Securities and Exchange Commission (the “SEC”) pursuant to Regulation S under the Securities Act. The Fund may invest in debt securities of any maturity or credit rating, including investment-grade securities, below investment grade securities and unrated securities. Although not required to do so, the Fund will generally invest in issuers whose senior debt is rated at least BBB- or higher, which the Fund considers to be investment grade. Although a company’s senior debt rating may be BBB-, an underlying security issued by such company in which the Fund invests may have a lower rating than BBB-. The Fund also will invest at least 25% of its assets in the financials sector, generally comprised of the bank, diversified financials (which may include asset management, brokerage services, specialized finance, and mortgage real estate investment trusts) and insurance industries worldwide. The Fund may invest without limit in derivatives, including any derivatives contract or option on a derivatives contract, transaction or instrument, such as various futures contracts, interest rate and currency swaps, options, and other similar strategic transactions. The Fund’s primary use of derivatives contracts will be to enter into interest rate and currency hedging transactions in order to manage the Fund’s interest rate risk and reduce foreign currency risk associated with certain of the Fund’s investments. The portfolio manager analyzes the overall investment opportunities and risks associated with building a portfolio of preferred and other income producing securities and identifies opportunities that may be mispriced by the market. Such opportunities will typically be identified through a rigorous analysis of an individual security’s structure, its sensitivity to interest rates as well as the fundamental characteristics of its company issuer. Security selection and overall portfolio construction is further guided by the portfolio manager’s interest rate and sector outlook.
Strategy Portfolio Concentration [Text]	rr_StrategyPortfolioConcentration	The Fund also will invest at least 25% of its assets in the financials sector, generally comprised of the bank, diversified financials (which may include asset management, brokerage services, specialized finance, and mortgage real estate investment trusts) and insurance industries worldwide.
Risk [Heading]	rr_RiskHeading	Principal Risks.
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	The price of the Fund’s shares can go up and down substantially. The value of the Fund’s investments may fall due to adverse changes in the markets in which the Fund invests or because of poor investment selection, which could cause the Fund to underperform other funds with similar investment objectives. There is no assurance that the Fund will achieve its investment objective. When you redeem your shares, they may be worth less than what you paid for them. These risks mean that you can lose money by investing in the Fund. Preferred Security Risk. Preferred securities generally are subordinated to bonds and other debt instruments in a company’s capital structure and, as such, have a lower priority claim on assets or earnings than more senior debt instruments. As a result, preferred securities are subject to greater credit and liquidity risk than those instruments. In addition, preferred securities are subject to other risks, such as having no or limited voting rights, being subject to special redemption rights, having distributions deferred or skipped, having floating interest rates or dividends, which may result in a decline in value in a falling interest rate environment, changing tax treatments and possibly being issued by companies in heavily regulated industries. Contingent Capital Security Risk. CoCos are hybrid securities, issued primarily by non-U.S. financial institutions with loss absorption mechanisms benefitting the issuer built into their terms. Upon the occurrence of specific triggers, such as the issuer’s capital ratio falling below a certain level, CoCos may be subject to automatic conversion into the issuer’s common stock, which likely will have declined in value and which will be subordinate to the issuer’s other classes of securities, or to an automatic write-down of the principal amount of the securities, potentially to zero, which could result in the Fund losing a portion or all of its investment in such securities. In addition, CoCos may provide for mandatory conversion or a principal write-down upon the occurrence of certain events such as regulatory actions calling into question the issuing banking institution’s continued viability as a going concern. Equity conversion or principal write-down features are unique to the issuer and its regulatory requirements and, unlike traditional convertible securities, conversions are not voluntary. Due to these features, CoCos may have substantially greater risk than other securities in times of financial stress. If the trigger level is breached, the issuer’s decisions to write down, write off or convert a CoCo may result in the Fund’s complete loss on an investment in CoCos with no chance of recovery even if the issuer remains in existence. CoCos are often rated below investment grade and are subject to the risks of below-investment-grade securities described below. Financials Sector Concentration Risk. Because the Fund invests at least 25% of its total assets in the financials sector, it will be more susceptible to adverse economic or regulatory occurrences affecting this sector, such as changes in interest rates, loan concentration and competition. In addition, the Fund will also be subject to the risks of investing in individual industries and securities that generally comprise the financials sector, including the bank, diversified financials (which may include asset management, brokerage services, and mortgage real estate investment trusts) and insurance industries worldwide. Industry Focus. At times the Fund may increase the relative emphasis of its investments in a particular industry. The prices of stocks of issuers in a particular industry may go up and down in response to changes in economic conditions, government regulations, availability of basic resources or supplies, or other events that affect that industry more than others. To the extent that the Fund increases the relative emphasis of its investments in a particular industry, its share values may fluctuate in response to events affecting that industry. Risks of Other Equity Securities. Most convertible securities are subject to the risks and price fluctuations of the underlying stock. They may be subject to the risk that the issuer will not be able to pay interest or dividends when due and their market value may change based on changes in the issuer’s credit rating or the market’s perception of the issuer’s creditworthiness. Some convertible preferred stocks have a conversion or call feature that allows the issuer to redeem the stock before the conversion date, which could diminish the potential for capital appreciation on the investment. The fixed dividend rate of preferred stocks may cause their prices to behave more like those of debt securities. If interest rates rise, the value of preferred stock having a fixed dividend rate tends to fall. The price of a warrant does not necessarily move parallel to the price of the underlying security and is generally more volatile than that of the underlying security. Rights are similar to warrants, but normally have a shorter duration. The market for rights or warrants may be very limited and it may be difficult to sell them promptly at an acceptable price. Rights and warrants have no voting rights, receive no dividends and have no rights with respect to the assets of the issuer. Risks of Investing in Debt Securities. Debt securities may be subject to interest rate risk, duration risk, credit risk, credit spread risk, extension risk, reinvestment risk, prepayment risk and event risk. Interest rate risk is the risk that when prevailing interest rates fall, the values of already-issued debt securities generally rise; and when prevailing interest rates rise, the values of already-issued debt securities generally fall, and therefore, those debt securities may be worth less than the amount the Fund paid for them or valued them. When interest rates change, the values of longer-term debt securities usually change more than the values of shorter-term debt securities. Risks associated with rising interest rates are heightened given that interest rates in the U.S. are near historic lows. Duration is a measure of the price sensitivity of a debt security or portfolio to interest rate changes. Duration risk is the risk that longer-duration debt securities will be more volatile and thus more likely to decline in price, and to a greater extent, in a rising interest rate environment than shorter-duration debt securities. Credit risk is the risk that the issuer of a security might not make interest and principal payments on the security as they become due. If an issuer fails to pay interest or repay principal, the Fund’s income or share value might be reduced. Adverse news about an issuer or a downgrade in an issuer’s credit rating, for any reason, can also reduce the market value of the issuer’s securities. “Credit spread” is the difference in yield between securities that is due to differences in their credit quality. There is a risk that credit spreads may increase when the market expects lower-grade bonds to default more frequently. Widening credit spreads may quickly reduce the market values of the Fund’s lower-rated and unrated securities. Some unrated securities may not have an active trading market or may trade less actively than rated securities, which means that the Fund might have difficulty selling them promptly at an acceptable price. Extension risk is the risk that an increase in interest rates could cause prepayments on a debt security to occur at a slower rate than expected. Extension risk is particularly prevalent for a callable security where an increase in interest rates could result in the issuer of that security choosing not to redeem the security as anticipated on the security’s call date. Such a decision by the issuer could have the effect of lengthening the debt security’s expected maturity, making it more vulnerable to interest rate risk and reducing its market value. Reinvestment risk is the risk that when interest rates fall the Fund may be required to reinvest the proceeds from a security’s sale or redemption at a lower interest rate. Callable bonds are generally subject to greater reinvestment risk than non-callable bonds. Prepayment risk is the risk that the issuer may redeem the security prior to the expected maturity or that borrowers may repay the loans that underlie these securities more quickly than expected, thereby causing the issuer of the security to repay the principal prior to the expected maturity. The Fund may need to reinvest the proceeds at a lower interest rate, reducing its income. Event risk is the risk that an issuer could be subject to an event, such as a buyout or debt restructuring, that interferes with its ability to make timely interest and principal payments and cause the value of its debt securities to fall. Fixed-Income Market Risks. The fixed-income securities market can be susceptible to increases in volatility and decreases in liquidity. Liquidity may decline unpredictably in response to overall economic conditions or credit tightening. During times of reduced market liquidity, the Fund may not be able to readily sell bonds at the prices at which they are carried on the Fund’s books and could experience a loss. If the Fund needed to sell large blocks of bonds to meet shareholder redemption requests or to raise cash, those sales could further reduce the bonds’ prices, particularly for lower-rated and unrated securities. An unexpected increase in redemptions by Fund shareholders (including requests from shareholders who may own a significant percentage of the Fund’s shares), which may be triggered by general market turmoil or an increase in interest rates, as well as other adverse market and economic developments, could cause the Fund to sell its holdings at a loss or at undesirable prices and adversely affect the Fund’s share price and increase the Fund’s liquidity risk, Fund expenses and/or taxable distributions. As of the date of this prospectus, interest rates in the U.S. are near historically low levels, increasing the exposure of bond investors to the risks associated with rising interest rates. Economic and other market developments can adversely affect fixed-income securities markets in the United States, Europe and elsewhere. At times, participants in debt securities markets may develop concerns about the ability of certain issuers of debt securities to make timely principal and interest payments, or they may develop concerns about the ability of financial institutions that make markets in certain debt securities to facilitate an orderly market. Those concerns may impact the market price or value of those debt securities and may cause increased volatility in those debt securities or debt securities markets. Under some circumstances, those concerns may cause reduced liquidity in certain debt securities markets, reducing the willingness of some lenders to extend credit, and making it more difficult for borrowers to obtain financing on attractive terms (or at all). A lack of liquidity or other adverse credit market conditions may hamper the Fund’s ability to sell the debt securities in which it invests or to find and purchase suitable debt instruments. Risks of Below-Investment-Grade Securities. As compared to investment-grade debt securities, below-investment-grade debt securities (also referred to as “junk” bonds), whether rated or unrated, may be subject to greater price fluctuations and increased credit risk, as the issuer might not be able to pay interest and principal when due, especially during times of weakening economic conditions or rising interest rates. Credit rating downgrades of a single issuer or related similar issuers whose securities the Fund holds in significant amounts could substantially and unexpectedly increase the Fund’s exposure to below-investment-grade securities and the risks associated with them, especially liquidity and default risk. The market for below-investment-grade securities may be less liquid and therefore these securities may be harder to value or sell at an acceptable price, especially during times of market volatility or decline.           Because the Fund can invest up to 100% of its assets in below-investment-grade securities, the Fund’s credit risks are greater than those of funds that buy only investment-grade securities. Credit rating downgrades of a single issuer or related similar issuers whose securities the Fund holds in significant amounts could substantially and unexpectedly increase the Fund’s exposure to below-investment-grade securities and the risks associated with them, especially liquidity and default risk. Risks of Investing in Regulation S Securities. Regulation S securities of U.S. and non-U.S. issuers are offered through private offerings without registration with the SEC pursuant to Regulation S of the Securities Act of 1933. Offerings of Regulation S securities may be conducted outside of the United States, and Regulation S securities may be relatively less liquid as a result of legal or contractual restrictions on resale. Although Regulation S securities may be resold in privately negotiated transactions, the price realized from these sales could be less than that originally paid by the Fund. Further, companies whose securities are not publicly traded may not be subject to the disclosure and other investor protection requirements that would be applicable if their securities were publicly traded. Accordingly, Regulation S securities may involve a high degree of business and financial risk and may result in substantial losses. Rule 144A Securities. Certain securities in which the Fund may invest are Rule 144A Securities. Rule 144A Securities are considered restricted securities because they are not registered for sale to the general public and may only be resold to certain qualified institutional buyers. Risks of Foreign Investing. Foreign securities are subject to special risks. Securities traded in foreign markets may be less liquid and more volatile than those traded in U.S. markets. Foreign issuers are usually not subject to the same accounting and disclosure requirements that U.S. companies are subject to, which may make it difficult for the Fund to evaluate a foreign company’s operations or financial condition. A change in the value of a foreign currency against the U.S. dollar will result in a change in the U.S. dollar value of investments denominated in that foreign currency and in the value of any income or distributions the Fund may receive on those investments. The value of foreign investments may be affected by exchange control regulations, foreign taxes, higher transaction and other costs, delays in the settlement of transactions, changes in economic or monetary policy in the United States or abroad, expropriation or nationalization of a company’s assets, or other political and economic factors. In addition, due to the inter-relationship of global economies and financial markets, changes in political and economic factors in one country or region could adversely affect conditions in another country or region. Investments in foreign securities may also expose the Fund to time-zone arbitrage risk. Foreign securities may trade on weekends or other days when the Fund does not price its shares. As a result, the value of the Fund’s net assets may change on days when you will not be able to purchase or redeem the Fund’s shares. At times, the Fund may emphasize investments in a particular country or region and may be subject to greater risks from adverse events that occur in that country or region. Foreign securities and foreign currencies held in foreign banks and securities depositories may be subject to only limited or no regulatory oversight. Risks of Derivative Investments. Derivatives may involve significant risks. Derivatives may be more volatile than other types of investments, may require the payment of premiums, may increase portfolio turnover, may be illiquid, and may not perform as expected. Derivatives are subject to counterparty risk and the Fund may lose money on a derivative investment if the issuer or counterparty fails to pay the amount due. Some derivatives have the potential for unlimited loss, regardless of the size of the Fund’s initial investment. As a result of these risks, the Fund could realize little or no income or lose money from its investment, or a hedge might be unsuccessful. In addition, under new rules enacted and currently being implemented under financial reform legislation, certain over-the-counter derivatives are (or soon will be) required to be executed on a regulated market and/or cleared through a clearinghouse. It is unclear how these regulatory changes will affect counterparty risk, and entering into a derivative transaction with a clearinghouse may entail further risks and costs. Who Is the Fund Designed For? The Fund is designed primarily for investors seeking total return from a fund that invests in preferred and other income producing securities. Those investors should be willing to assume the risks of short-term share price fluctuations and losses that are typical for a fund with substantial investments in equity securities. Since the Fund’s income level will fluctuate, it is not designed for investors needing an assured level of current income. The Fund is not a complete investment program. You should carefully consider your own investment goals and risk tolerance before investing in the Fund. An investment in the Fund is not a deposit of any bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Risk Lose Money [Text]	rr_RiskLoseMoney	These risks mean that you can lose money by investing in the Fund.
Risk Not Insured Depository Institution [Text]	rr_RiskNotInsuredDepositoryInstitution	An investment in the Fund is not a deposit of any 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	The Fund’s Past Performance.
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	Because the Fund had not commenced operations prior to the date of this prospectus, it has no prior performance information. After the Fund begins investment operations, performance information showing the variability of the Fund’s returns will be available by calling the toll-free number on the back of the prospectus and on the Fund’s website at: https://www.oppenheimerfunds.com/fund/PreferredSecuritiesAndIncomeFund
Performance One Year or Less [Text]	rr_PerformanceOneYearOrLess	Because the Fund had not commenced operations prior to the date of this prospectus, it has no prior performance information.
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	https://www.oppenheimerfunds.com/fund/PreferredSecuritiesAndIncomeFund
Oppenheimer Preferred Securities and Income Fund | Class A
Risk/Return:	rr_RiskReturnAbstract
Maximum Sales Charge (Load) imposed on purchases (as % of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	4.75%
Maximum Deferred Sales Charge (Load) (as % of the lower of original offering price or redemption proceeds)	rr_MaximumDeferredSalesChargeOverOther	none
Management Fees	rr_ManagementFeesOverAssets	0.65%
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other Expenses	rr_OtherExpensesOverAssets	0.46%	[1]
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.36%
Fee Waiver and Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.17%)	[2]
Total Annual Fund Operating Expenses after Fee Waiver and/or Expense Reimbursement	rr_NetExpensesOverAssets	1.19%
1 Year	rr_ExpenseExampleYear01	$ 591
3 Years	rr_ExpenseExampleYear03	872
1 Year	rr_ExpenseExampleNoRedemptionYear01	591
3 Years	rr_ExpenseExampleNoRedemptionYear03	$ 872
Oppenheimer Preferred Securities and Income Fund | Class Y
Risk/Return:	rr_RiskReturnAbstract
Maximum Sales Charge (Load) imposed on purchases (as % of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum Deferred Sales Charge (Load) (as % of the lower of original offering price or redemption proceeds)	rr_MaximumDeferredSalesChargeOverOther	none
Management Fees	rr_ManagementFeesOverAssets	0.65%
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	none
Other Expenses	rr_OtherExpensesOverAssets	0.46%	[1]
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.11%
Fee Waiver and Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.17%)	[2]
Total Annual Fund Operating Expenses after Fee Waiver and/or Expense Reimbursement	rr_NetExpensesOverAssets	0.94%
1 Year	rr_ExpenseExampleYear01	$ 96
3 Years	rr_ExpenseExampleYear03	338
1 Year	rr_ExpenseExampleNoRedemptionYear01	96
3 Years	rr_ExpenseExampleNoRedemptionYear03	$ 338
Oppenheimer Preferred Securities and Income Fund | Class I
Risk/Return:	rr_RiskReturnAbstract
Maximum Sales Charge (Load) imposed on purchases (as % of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum Deferred Sales Charge (Load) (as % of the lower of original offering price or redemption proceeds)	rr_MaximumDeferredSalesChargeOverOther	none
Management Fees	rr_ManagementFeesOverAssets	0.65%
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	none
Other Expenses	rr_OtherExpensesOverAssets	0.27%	[1]
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	0.92%
Fee Waiver and Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.17%)	[2]
Total Annual Fund Operating Expenses after Fee Waiver and/or Expense Reimbursement	rr_NetExpensesOverAssets	0.75%
1 Year	rr_ExpenseExampleYear01	$ 77
3 Years	rr_ExpenseExampleYear03	278
1 Year	rr_ExpenseExampleNoRedemptionYear01	77
3 Years	rr_ExpenseExampleNoRedemptionYear03	$ 278

[1] “Other Expenses” are based on estimates for the current fiscal year.

[2] OFI Global has contractually agreed to waive a portion of its management fees and/or reimburse the Fund for certain of its expenses so that total annual fund operating expenses after any fee waiver and/or expense reimbursement (excluding any applicable dividend expense, taxes, interest and fees from borrowing, any subsidiary expenses, Acquired Fund Fees and Expenses, brokerage commissions, unusual and infrequent expenses and certain other Fund expenses) will not exceed 1.19% of average annual net assets for Class A shares, 0.94% for Class Y shares, and 0.75% for Class I Shares. These fee waivers and/or expense reimbursements may not be amended or withdrawn for one year from the date of the prospectus, unless approved by the Board.