485BPOS

Registration No. 2-76547

File No. 811-3420

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549

FORM N-1A

REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933	☒
Pre-Effective Amendment No.	☐
Post-Effective Amendment No. 72	☒

and/or

REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940	☒
Amendment No. 73	☒

Oppenheimer Integrity Funds

(Exact Name of Registrant as Specified in Charter)

6803 South Tucson Way, Centennial, Colorado 80112-3924

(Address of Principal Executive Offices) (Zip Code)

(303) 768-3200

(Registrant’s Telephone Number, including Area Code)

Cynthia Lo Bessette, Esq.

OFI Global Asset Management, Inc.

225 Liberty Street, New York, New York 10281-1008

(Name and Address of Agent for Service)

It is proposed that this filing will become effective (check appropriate box):

☒ immediately upon filing pursuant to paragraph (b)

☐ on                      pursuant to paragraph (b)

☐ 60 days after filing pursuant to paragraph (a)(1)

☐ on                      pursuant to paragraph (a)(1)

☐ 75 days after filing pursuant to paragraph (a)(2)

☐ on                      pursuant to paragraph (a)(2) of Rule 485.

If appropriate, check the following box:

☐ This post-effective amendment designates a new effective date for a previously filed post-effective amendment.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933 and the Investment Company Act of 1940, the Registrant certifies that it meets all the requirements for effectiveness of this Registration Statement pursuant to Rule 485(b) under the Securities Act of 1933 and has duly caused this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of New York and State of New York on the 7th day of February.

Oppenheimer Integrity Funds on behalf of its series Oppenheimer Global Unconstrained Bond Fund
By:	Arthur P. Steinmetz*
	Arthur P. Steinmetz
	Trustee, President and Principal Executive Officer

Pursuant to the requirements of the Securities Act of 1933, this Registration Statement has been signed below by the following persons in the capacities on the dates indicated:

Signatures	Title	Date
Robert J. Malone*	Chairman of the Board of Trustees	February 7, 2018
Robert J. Malone
Arthur P. Steinmetz*	Trustee, President and Principal Executive Officer	February 7, 2018
Arthur P. Steinmetz
Brian S. Petersen*	Treasurer, Principal Financial & Accounting Officer	February 7, 2018
Brian S. Petersen
Andrew J. Donohue*	Trustee	February 7, 2018
Andrew J. Donohue
Richard F. Grabish*	Trustee	February 7, 2018
Richard F. Grabish
Beverly L. Hamilton*	Trustee	February 7, 2018
Beverly L. Hamilton
Victoria J. Herget*	Trustee	February 7, 2018
Victoria J. Herget
F. William Marshall, Jr.*	Trustee	February 7, 2018
F. William Marshall, Jr.
Karen L. Stuckey*	Trustee	February 7, 2018
Karen L. Stuckey
James D. Vaughn*	Trustee	February 7, 2018
James D. Vaughn
*By: /s/ Taylor V. Edwards
Taylor V. Edwards, Attorney-in-Fact

EXHIBIT INDEX

Exhibit No.	Description
Ex-101.INS	XBRL Instance Document
Ex-101.SCH	XBRL Taxonomy Extension Schema Document
Ex-101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document
Ex-101.DEF	XBRL Taxonomy Extension Definition Linkbase
Ex-101.LAB	XBRL Taxonomy Extension Labels Linkbase
Ex-101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Document Type	dei_DocumentType	485BPOS
Document Period End Date	dei_DocumentPeriodEndDate	Jan. 17, 2018
Registrant Name	dei_EntityRegistrantName	OPPENHEIMER INTEGRITY FUNDS
Central Index Key	dei_EntityCentralIndexKey	0000701265
Amendment Flag	dei_AmendmentFlag	false
Document Creation Date	dei_DocumentCreationDate	Jan. 17, 2018
Document Effective Date	dei_DocumentEffectiveDate	Jan. 17, 2018
Prospectus Date	rr_ProspectusDate	Jan. 16, 2018

XML

Oppenheimer Global Unconstrained Bond Fund

The Fund Summary

Investment Objective.

The Fund seeks total return.

Fees and Expenses of the Fund.

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 is available from your financial professional and in the section “About Your Account” beginning on page 25 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 61 in the Fund’s Statement of Additional Information.

Shareholder Fees
(fees paid directly from your investment)

Shareholder Fees - Oppenheimer Global Unconstrained Bond Fund	Class A	Class T	Class C	Class R	Class Y	Class I
Maximum Sales Charge (Load) imposed on purchases (as % of offering price)	4.75%	2.50%	none	none	none	none
Maximum Deferred Sales Charge (Load) (as % of the lower of original offering price or redemption proceeds)	none	none	1.00%	none	none	none

Annual Fund Operating Expenses
(expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses - Oppenheimer Global Unconstrained Bond Fund		Class A	Class T	Class C	Class R	Class Y	Class I
Management Fees		0.60%	0.60%	0.60%	0.60%	0.60%	0.60%
Distribution and/or Service (12b-1) Fees		0.25%	0.25%	1.00%	0.50%	none	none
Other Expenses	[1]	0.46%	0.46%	0.46%	0.46%	0.46%	0.27%
Acquired Fund Fees and Expenses		0.14%	0.14%	0.14%	0.14%	0.14%	0.14%
Total Annual Fund Operating Expenses		1.45%	1.45%	2.20%	1.70%	1.20%	1.01%
Fee Waiver and Expense Reimbursement	[2]	(0.31%)	(0.31%)	(0.31%)	(0.31%)	(0.21%)	(0.12%)
Total Annual Fund Operating Expenses after Fee Waiver and Expense Reimbursement		1.14%	1.14%	1.89%	1.39%	0.99%	0.89%

Example.

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 would be 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:

If shares are redeemed

Expense Example - Oppenheimer Global Unconstrained Bond Fund - USD ($)	1 Year	3 Years
Class A	586	886
Class T	364	670
Class C	294	665
Class R	142	510
Class Y	101	362
Class I	91	311

If shares are not redeemed

Expense Example, No Redemption - Oppenheimer Global Unconstrained Bond Fund - USD ($)	1 Year	3 Years
Class A	586	886
Class T	364	670
Class C	194	665
Class R	142	510
Class Y	101	362
Class I	91	311

Portfolio Turnover.

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.

Principal Investment Strategies.

The Fund seeks to achieve its investment objective by employing a top-down, global macro-focused strategy that targets a fixed level of risk, as determined by volatility, across global interest rate and credit market regimes. As an “unconstrained” bond fund, the Fund has the flexibility to invest across all fixed-income asset classes in both domestic and foreign markets.

Under normal market conditions, the Fund invests at least 80% of its net assets (plus borrowings for investment purposes) in debt securities. The Fund may invest without limit in a variety of fixed income instruments such as, but not limited to, government and government related debt (of both developed and emerging markets nations), corporate debt (including corporate bonds, corporate notes, bank loans and convertible bonds), securitized debt (including agency and private issuer mortgaged backed securities and asset backed securities) and municipal debt (both taxable and tax exempt).

Under normal market conditions, the Fund will invest a significant portion of its assets in a number of different countries throughout the world, including the U.S. and at least three countries outside of the U.S. Although the Fund can invest up to 100% of its assets in countries outside of the U.S., under normal circumstances it generally expects (but is not required, as subsequently discussed) to invest at least 40% of its assets in such countries. However, if the investment adviser determines, in its sole discretion, that market conditions are not favorable, the Fund may invest less than 40% of its assets in such countries, but generally will not invest less than 30% of its assets in such countries. The Fund is not required to allocate its investments in any set percentages in any particular countries. The Fund also may invest in cash and cash equivalents, including commercial paper, short-term variable rate and floating rate obligations, repurchase agreements, and money market funds.

The Fund may buy securities issued by companies of any size or market capitalization range. It can invest in debt securities having short-, intermediate- or long-term maturities. The Fund does not limit its investments to a particular credit quality or rating category and can invest without limit in securities rated below investment grade (commonly called “junk bonds”). “Investment grade” debt securities are rated in one of the top four categories by nationally recognized statistical rating organizations such as Moody’s Investors Service or S&P Global Ratings (“S&P”). The Fund may also invest in unrated securities, in which case the Fund’s investment Sub-Adviser, OppenheimerFunds, Inc., may internally assign ratings to certain of those securities, after assessing their credit quality, in investment-grade or below-investment-grade categories similar to those of nationally recognized statistical rating organizations. There can be no assurance, nor is it intended, that the Sub-Adviser’s credit analysis is consistent or comparable with the credit analysis process used by a nationally recognized statistical rating organization.

The Fund may invest without limit in derivatives, including credit default swaps, interest rate swaps, total return swaps, volatility swaps, and currency swaps. The Fund may also use forward foreign currency exchange contracts, futures contracts on debt (including interest rate futures), commodities or indices, options on futures and other options, swaptions, “structured” notes and other structured investments, and various other derivatives. Derivatives are used to seek increased returns, manage investment risks or liquidity, or for hedging purposes. The Fund may implement short positions through derivatives. The Fund’s exposure to derivatives will vary.

The Fund may also invest significantly in the securities of other investment companies, including exchange-traded funds (ETFs), subject to any limitations imposed by the Investment Company Act of 1940 or any exemptive relief therefrom, in order to obtain exposure to the asset classes, investment strategies and types of securities it seeks to invest in. These include investment companies that are sponsored and/or advised by the Fund’s investment adviser or an affiliate, as well as non-affiliated investment companies.

To select the fixed income sectors in which the Fund will invest, the portfolio manager will establish (and will periodically re-set) a targeted level of investment risk based on the expected volatility of the global bond market at that time. Once established, the portfolio manager will invest in those fixed income sectors that are believed to provide the best opportunity for positive returns without exceeding the targeted level of investment risk.

Principal Risks.

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.

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 without limit in below-investment-grade securities, the Fund’s credit risks are greater than those of funds that buy only investment-grade securities.

Asset-Backed Securities Risk. The Fund can buy asset-backed securities, which are fractional interests in pools of loans and are collateralized by the loans, other assets or receivables. They are typically issued by trusts and special purpose corporations that pass the income from the underlying pool to the purchasers. These securities are subject to the risk of default by the issuer as well as by the borrowers of the underlying loans in the pool, and to interest rate and prepayment risks.

Risks of Mortgage-Related Securities. The Fund can buy interests in pools of residential or commercial mortgages in the form of “pass-through” mortgage securities. They may be issued or guaranteed by the U.S. government, or its agencies and instrumentalities, or by private issuers. The prices and yields of mortgage-related securities are determined, in part, by assumptions about the rate of payments of the underlying mortgages and are subject to the risks of unanticipated prepayment and extension risks. Mortgage-backed securities are also subject to interest rate risk, and the market for mortgage-backed securities may be volatile at times and may be less liquid than the markets for other types of securities. Mortgage-related securities issued by private issuers are not U.S. government securities, and are subject to greater credit risks than mortgage-related securities that are U.S. government securities. In addition, a substantial portion of the Fund’s assets may be subject to “forward roll” transactions (also referred to as “mortgage dollar rolls”) at any given time, which subject the Fund to the risk that market value of the mortgage-related securities involved might decline, and that the counterparty might default in its obligations.

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 Developing and Emerging Markets. Investments in developing and emerging markets are subject to all the risks associated with foreign investing, however, these risks may be magnified in developing and emerging markets. Developing or emerging market countries may have less well-developed securities markets and exchanges that may be substantially less liquid than those of more developed markets. Settlement procedures in developing or emerging markets may differ from those of more established securities markets, and settlement delays may result in the inability to invest assets or to dispose of portfolio securities in a timely manner. Securities prices in developing or emerging markets may be significantly more volatile than is the case in more developed nations of the world, and governments of developing or emerging market countries may also be more unstable than the governments of more developed countries. Such countries’ economies may be more dependent on relatively few industries or investors that may be highly vulnerable to local and global changes. Developing or emerging market countries also may be subject to social, political or economic instability. The value of developing or emerging market countries’ currencies may fluctuate more than the currencies of countries with more mature markets. Investments in developing or emerging market countries may be subject to greater risks of government restrictions, including confiscatory taxation, expropriation or nationalization of a company’s assets, restrictions on foreign ownership of local companies, restrictions on withdrawing assets from the country, protectionist measures, and practices such as share blocking. In addition, the ability of foreign entities to participate in privatization programs of certain developing or emerging market countries may be limited by local law. Investments in securities of issuers in developing or emerging market countries may be considered speculative.

           Eurozone Investment Risks. Certain of the regions in which the Fund may invest, including the European Union (EU), currently experience significant financial difficulties. Following the global economic crisis that began in 2008, some of these countries have depended on, and may continue to be dependent on, the assistance from others such as the European Central Bank (ECB) or other governments or institutions, and failure to implement reforms as a condition of assistance could have a significant adverse effect on the value of investments in those and other European countries. In addition, countries that have adopted the euro are subject to fiscal and monetary controls that could limit the ability to implement their own economic policies, and could voluntarily abandon, or be forced out of, the euro. Such events could impact the market values of Eurozone and various other securities and currencies, cause redenomination of certain securities into less valuable local currencies, and create more volatile and illiquid markets. Additionally, the United Kingdom’s intended departure from the EU, commonly known as “Brexit,” may have significant political and financial consequences for Eurozone markets, including greater market volatility and illiquidity, currency fluctuations, deterioration in economic activity, a decrease in business confidence and an increased likelihood of a recession in the United Kingdom.

Risks of Sovereign Debt. Sovereign debt instruments are subject to the risk that a governmental entity may delay or refuse, or otherwise be unable, to pay interest or repay principal on its sovereign debt. If a governmental entity defaults, it may ask for more time in which to pay or for further loans. There is no legal process for collecting sovereign debt that a government does not pay nor are there bankruptcy proceedings through which all or part of such sovereign debt may be collected. A restructuring or default of sovereign debt may also cause additional impacts to the financial markets, such as downgrades to credit ratings, a flight to quality debt instruments, disruptions in common trading markets or unions, reduced liquidity, increased volatility, and heightened financial sector, foreign securities and currency risk, among others.

Risk of Investing in Floating and Variable Rate Obligations. Some fixed-income securities have variable or floating interest rates that provide for a periodic adjustment in the interest rate paid on the securities. The rate adjustment intervals may be regular and range from daily up to annually, or may be based on an event, such as a change in the stated prevailing market rate. Floating and variable rate securities may be subject to greater liquidity risk than other debt securities, meaning that there may be limitations on the Fund’s ability to sell the securities at any given time. Such securities also may lose value.

Municipal Securities. The Fund may invest in municipal securities. Municipal securities are fixed-income securities primarily issued by states, cities, counties and other governmental entities in the United States to raise money for a variety of public or private purposes, including financing state or local governments, financing specific projects, or financing public facilities. The interest received from most municipal bonds is exempt from federal, state or local income taxes in the municipalities where the bonds are issued, however the Fund can invest in municipal securities because the investment adviser believes they offer attractive yields relative to the yields and risks of other debt securities, rather than to seek tax-exempt interest income for distribution to shareholders.

          Risks of Investing in Municipal Securities. Municipal securities may be subject to interest rate risk and credit risk. The value of the Fund’s investment in municipal securities will be highly sensitive to events affecting the fiscal stability of the states, municipalities, agencies, authorities and other instrumentalities that issue the municipal securities. In particular, economic, legislative, regulatory or political developments affecting the ability of a state’s issuers to pay interest or repay principal may significantly affect the value of the Fund’s investments in these securities. These developments can include or arise from, for example, insolvency of an issuer, uncertainties related to the tax status of municipal securities, tax base erosion, state constitutional limits on tax increases, budget deficits and other financial difficulties, or changes in the credit ratings assigned to the state’s municipal issuers. Other occurrences, such as catastrophic natural disasters, can also adversely affect a state’s fiscal stability. National economic crises, such as occurred in the latter half of 2008 and early 2009, may cause deterioration in the economies of many states, resulting in an adverse impact on states’ spending, revenues and state budgets that can cause many states to operate under significant financial stress.

Risks of Money Market Instruments.The Fund may invest in money market instruments. Money market instruments are short-term, US dollar-denominated debt instruments issued or guaranteed by domestic and foreign corporations and financial institutions, the U.S. government, its agencies and instrumentalities and other entities. Money market instruments include certificates of deposit, commercial paper, repurchase agreements, treasury bills, certain asset-backed securities and other short term debt obligations that have a final maturity, as defined under rules under the Investment Company Act of 1940, of 397 days or less. They may have fixed, variable or floating interest rates. Money market instruments are subject to certain risks, including the risk that an issuer of an obligation that the Fund holds might have its credit rating downgraded or might default on its obligations, or that interest rates might rise sharply, causing the value of the Fund’s investments to fall.

Risks of Repurchase Agreements. In a repurchase transaction, the Fund buys a security and simultaneously sells it back to the vendor for delivery at a future date. If the seller fails to pay the repurchase price on the delivery date, the Fund may incur costs in disposing of the collateral and may experience losses if there is any delay in its ability to do so. If the default on the part of the seller is due to its bankruptcy, the Fund’s ability to liquidate the collateral may be delayed or limited.

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.

Risks of Hedging. The Fund may engage in “hedging” strategies, including short sales, futures and other derivatives in an effort to protect assets from losses due to declines in the value of the Fund’s portfolio. There are risks in the use of these investment and trading strategies. There can be no assurance that the hedging strategies used will be successful in avoiding losses, and hedged positions may perform less favorably in generally rising markets than unhedged positions. If the Fund uses a hedging strategy at the wrong time or judges market conditions incorrectly, the strategy could reduce the Fund’s return. In some cases, derivatives or other investments may be unavailable, or the investment adviser may choose not to use them under market conditions when their use, in hindsight, may be determined to have been beneficial to the Fund. No assurance can be given that the investment adviser will employ hedging strategies with respect to all or any portion of the Fund’s assets.

Risks of Senior Loans. The Fund may invest in floating rate loans (sometimes referred to as “adjustable rate loans”) that hold a senior position in the capital structure of U.S. and foreign corporations, partnerships or other business entities that, under normal circumstances, allow them to have priority of claim ahead of other obligations of a borrower in the event of liquidation. These investments are referred to as “Senior Loans.” Senior Loans may be collateralized or uncollateralized. They typically pay interest at rates that are reset periodically based on a reference benchmark that reflects current interest rates, plus a margin or premium. In addition to the risks typically associated with debt securities, such as credit and interest rate risk, Senior Loans are also subject to the risk that a court could subordinate a Senior Loan, which typically holds a senior position in the capital structure of a borrower, to presently existing or future indebtedness or take other action detrimental to the holders of Senior Loans. Senior Loans usually have mandatory and optional prepayment provisions. If a borrower prepays a Senior Loan, the Fund will have to reinvest the proceeds in other Senior Loans or securities that may pay lower interest rates. Senior Loans are subject to the risk that the value of the collateral, if any, securing a loan may decline, be insufficient to meet the obligations of the borrower, or be difficult to liquidate. In the event of a default, the Fund may have difficulty collecting on any collateral and would not have the ability to collect on any collateral for an uncollateralized loan. In addition, any collateral may be found invalid or may be used to pay other outstanding obligations of the borrower. The Fund’s access to collateral, if any, may be limited by bankruptcy, other insolvency laws, or by the type of loan the Fund has purchased. As a result, a collateralized Senior Loan may not be fully collateralized and can decline significantly in value.

Loan investments are often issued in connection with highly leveraged transactions. Such transactions include leveraged buyout loans, leveraged recapitalization loans, and other types of acquisition financing. These obligations are subject to greater credit risks than other investments including a greater possibility that the borrower may default or enter bankruptcy.

Due to restrictions on transfers in loan agreements and the nature of the private syndication of Senior Loans including, for example, the lack of publicly-available information, some Senior Loans are not as easily purchased or sold as publicly-traded securities. Some Senior Loans and other Fund investments are illiquid, which may make it difficult for the Fund to value them or dispose of them at an acceptable price when it wants to. Direct investments in Senior Loans and, to a lesser degree, investments in participation interests in or assignments of Senior Loans may be limited. Investments in Senior Loans are expected to be less affected by changes in interest rates than fixed-rate securities.

Compared to securities and to certain other types of financial assets, purchases and sales of loans take relatively longer to settle. To the extent the extended loan settlement process gives rise to short-term liquidity needs, such as the need to satisfy redemption requests, the Fund may hold cash, sell investments or temporarily borrow from banks or other lenders. If the Fund undertakes such measures, the Fund’s ability to pay redemption proceeds in a timely manner may be adversely affected, as well as the Fund’s performance.

In certain circumstances, loans may not be deemed to be securities, and in the event of fraud or misrepresentation by a borrower or an arranger, lenders will not have the protection of the anti-fraud provisions of the federal securities laws, as would be the case for bonds or stocks.

Risks of Investments in Other Investment Companies. As an investor in another investment company, the Fund would be subject to the risks of that investment company’s portfolio. Investing in another investment company may also involve paying a premium above the value of that investment company’s portfolio securities and is subject to a ratable share of that investment company’s expenses, including its advisory and administration expenses. The Fund does not intend to invest in other investment companies unless it is believed that the potential benefits of the investment justify the payment of any premiums, expenses or sales charges. The Investment Company Act of 1940 also imposes limitations on mutual funds’ investments in other investment companies.

Who Is the Fund Designed For? The Fund is designed primarily for investors seeking total return from a fund that invests in a variety of fixed income sectors, including government, corporate, securitized and municipal debt. Those investors should be willing to assume the greater risks of short-term share price fluctuations and the special credit risks that are typical for a fund that invests in below-investment grade fixed-income securities and foreign securities. The Fund is not designed for investors needing an assured level of current income. The Fund is intended to be a long-term investment. 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.

The Fund’s Past Performance.

Performance history will be available after the Fund has been in operation for a full calendar year. While the Fund’s past investment performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future, updated performance information, showing the variability of the Fund’s returns, is 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/GlobalUnconstrainedBondFund

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

[2] After discussions with the Fund’s Board of Trustees, the Manager has contractually agreed to waive fees and/or reimburse the Fund for certain expenses in order to limit “Total Annual Fund Operating Expenses After 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) to annual rates of 1.00% for Class A shares, 1.00% for Class T shares, 1.75% for Class C shares, 1.25% for Class R shares, 0.85% for Class Y shares and 0.75% for Class I shares, as calculated on the daily net assets of the Fund. These fee waivers and/or expense reimbursements may not be amended or withdrawn for one year from the date of this prospectus, unless approved by the Board. The Manager will waive fees and/or reimburse Fund expenses in an amount equal to the indirect management fees incurred through the Fund?s investments in funds managed by the Manager or its affiliates.

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Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	OPPENHEIMER INTEGRITY FUNDS
Prospectus Date	rr_ProspectusDate	Jan. 16, 2018
Oppenheimer Global Unconstrained Bond 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 is available from your financial professional and in the section “About Your Account” beginning on page 25 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 61 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 this 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 estimated amounts 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 would be 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:
Expense Example by, Year, Caption [Text]	rr_ExpenseExampleByYearCaption	If shares are redeemed
Expense Example, No Redemption, By Year, Caption [Text]	rr_ExpenseExampleNoRedemptionByYearCaption	If shares are not redeemed
Strategy [Heading]	rr_StrategyHeading	Principal Investment Strategies.
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	The Fund seeks to achieve its investment objective by employing a top-down, global macro-focused strategy that targets a fixed level of risk, as determined by volatility, across global interest rate and credit market regimes. As an “unconstrained” bond fund, the Fund has the flexibility to invest across all fixed-income asset classes in both domestic and foreign markets. Under normal market conditions, the Fund invests at least 80% of its net assets (plus borrowings for investment purposes) in debt securities. The Fund may invest without limit in a variety of fixed income instruments such as, but not limited to, government and government related debt (of both developed and emerging markets nations), corporate debt (including corporate bonds, corporate notes, bank loans and convertible bonds), securitized debt (including agency and private issuer mortgaged backed securities and asset backed securities) and municipal debt (both taxable and tax exempt). Under normal market conditions, the Fund will invest a significant portion of its assets in a number of different countries throughout the world, including the U.S. and at least three countries outside of the U.S. Although the Fund can invest up to 100% of its assets in countries outside of the U.S., under normal circumstances it generally expects (but is not required, as subsequently discussed) to invest at least 40% of its assets in such countries. However, if the investment adviser determines, in its sole discretion, that market conditions are not favorable, the Fund may invest less than 40% of its assets in such countries, but generally will not invest less than 30% of its assets in such countries. The Fund is not required to allocate its investments in any set percentages in any particular countries. The Fund also may invest in cash and cash equivalents, including commercial paper, short-term variable rate and floating rate obligations, repurchase agreements, and money market funds. The Fund may buy securities issued by companies of any size or market capitalization range. It can invest in debt securities having short-, intermediate- or long-term maturities. The Fund does not limit its investments to a particular credit quality or rating category and can invest without limit in securities rated below investment grade (commonly called “junk bonds”). “Investment grade” debt securities are rated in one of the top four categories by nationally recognized statistical rating organizations such as Moody’s Investors Service or S&P Global Ratings (“S&P”). The Fund may also invest in unrated securities, in which case the Fund’s investment Sub-Adviser, OppenheimerFunds, Inc., may internally assign ratings to certain of those securities, after assessing their credit quality, in investment-grade or below-investment-grade categories similar to those of nationally recognized statistical rating organizations. There can be no assurance, nor is it intended, that the Sub-Adviser’s credit analysis is consistent or comparable with the credit analysis process used by a nationally recognized statistical rating organization. The Fund may invest without limit in derivatives, including credit default swaps, interest rate swaps, total return swaps, volatility swaps, and currency swaps. The Fund may also use forward foreign currency exchange contracts, futures contracts on debt (including interest rate futures), commodities or indices, options on futures and other options, swaptions, “structured” notes and other structured investments, and various other derivatives. Derivatives are used to seek increased returns, manage investment risks or liquidity, or for hedging purposes. The Fund may implement short positions through derivatives. The Fund’s exposure to derivatives will vary. The Fund may also invest significantly in the securities of other investment companies, including exchange-traded funds (ETFs), subject to any limitations imposed by the Investment Company Act of 1940 or any exemptive relief therefrom, in order to obtain exposure to the asset classes, investment strategies and types of securities it seeks to invest in. These include investment companies that are sponsored and/or advised by the Fund’s investment adviser or an affiliate, as well as non-affiliated investment companies. To select the fixed income sectors in which the Fund will invest, the portfolio manager will establish (and will periodically re-set) a targeted level of investment risk based on the expected volatility of the global bond market at that time. Once established, the portfolio manager will invest in those fixed income sectors that are believed to provide the best opportunity for positive returns without exceeding the targeted level of investment risk.
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. 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 without limit in below-investment-grade securities, the Fund’s credit risks are greater than those of funds that buy only investment-grade securities. Asset-Backed Securities Risk. The Fund can buy asset-backed securities, which are fractional interests in pools of loans and are collateralized by the loans, other assets or receivables. They are typically issued by trusts and special purpose corporations that pass the income from the underlying pool to the purchasers. These securities are subject to the risk of default by the issuer as well as by the borrowers of the underlying loans in the pool, and to interest rate and prepayment risks. Risks of Mortgage-Related Securities. The Fund can buy interests in pools of residential or commercial mortgages in the form of “pass-through” mortgage securities. They may be issued or guaranteed by the U.S. government, or its agencies and instrumentalities, or by private issuers. The prices and yields of mortgage-related securities are determined, in part, by assumptions about the rate of payments of the underlying mortgages and are subject to the risks of unanticipated prepayment and extension risks. Mortgage-backed securities are also subject to interest rate risk, and the market for mortgage-backed securities may be volatile at times and may be less liquid than the markets for other types of securities. Mortgage-related securities issued by private issuers are not U.S. government securities, and are subject to greater credit risks than mortgage-related securities that are U.S. government securities. In addition, a substantial portion of the Fund’s assets may be subject to “forward roll” transactions (also referred to as “mortgage dollar rolls”) at any given time, which subject the Fund to the risk that market value of the mortgage-related securities involved might decline, and that the counterparty might default in its obligations. 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 Developing and Emerging Markets. Investments in developing and emerging markets are subject to all the risks associated with foreign investing, however, these risks may be magnified in developing and emerging markets. Developing or emerging market countries may have less well-developed securities markets and exchanges that may be substantially less liquid than those of more developed markets. Settlement procedures in developing or emerging markets may differ from those of more established securities markets, and settlement delays may result in the inability to invest assets or to dispose of portfolio securities in a timely manner. Securities prices in developing or emerging markets may be significantly more volatile than is the case in more developed nations of the world, and governments of developing or emerging market countries may also be more unstable than the governments of more developed countries. Such countries’ economies may be more dependent on relatively few industries or investors that may be highly vulnerable to local and global changes. Developing or emerging market countries also may be subject to social, political or economic instability. The value of developing or emerging market countries’ currencies may fluctuate more than the currencies of countries with more mature markets. Investments in developing or emerging market countries may be subject to greater risks of government restrictions, including confiscatory taxation, expropriation or nationalization of a company’s assets, restrictions on foreign ownership of local companies, restrictions on withdrawing assets from the country, protectionist measures, and practices such as share blocking. In addition, the ability of foreign entities to participate in privatization programs of certain developing or emerging market countries may be limited by local law. Investments in securities of issuers in developing or emerging market countries may be considered speculative.            Eurozone Investment Risks. Certain of the regions in which the Fund may invest, including the European Union (EU), currently experience significant financial difficulties. Following the global economic crisis that began in 2008, some of these countries have depended on, and may continue to be dependent on, the assistance from others such as the European Central Bank (ECB) or other governments or institutions, and failure to implement reforms as a condition of assistance could have a significant adverse effect on the value of investments in those and other European countries. In addition, countries that have adopted the euro are subject to fiscal and monetary controls that could limit the ability to implement their own economic policies, and could voluntarily abandon, or be forced out of, the euro. Such events could impact the market values of Eurozone and various other securities and currencies, cause redenomination of certain securities into less valuable local currencies, and create more volatile and illiquid markets. Additionally, the United Kingdom’s intended departure from the EU, commonly known as “Brexit,” may have significant political and financial consequences for Eurozone markets, including greater market volatility and illiquidity, currency fluctuations, deterioration in economic activity, a decrease in business confidence and an increased likelihood of a recession in the United Kingdom. Risks of Sovereign Debt. Sovereign debt instruments are subject to the risk that a governmental entity may delay or refuse, or otherwise be unable, to pay interest or repay principal on its sovereign debt. If a governmental entity defaults, it may ask for more time in which to pay or for further loans. There is no legal process for collecting sovereign debt that a government does not pay nor are there bankruptcy proceedings through which all or part of such sovereign debt may be collected. A restructuring or default of sovereign debt may also cause additional impacts to the financial markets, such as downgrades to credit ratings, a flight to quality debt instruments, disruptions in common trading markets or unions, reduced liquidity, increased volatility, and heightened financial sector, foreign securities and currency risk, among others. Risk of Investing in Floating and Variable Rate Obligations. Some fixed-income securities have variable or floating interest rates that provide for a periodic adjustment in the interest rate paid on the securities. The rate adjustment intervals may be regular and range from daily up to annually, or may be based on an event, such as a change in the stated prevailing market rate. Floating and variable rate securities may be subject to greater liquidity risk than other debt securities, meaning that there may be limitations on the Fund’s ability to sell the securities at any given time. Such securities also may lose value. Municipal Securities. The Fund may invest in municipal securities. Municipal securities are fixed-income securities primarily issued by states, cities, counties and other governmental entities in the United States to raise money for a variety of public or private purposes, including financing state or local governments, financing specific projects, or financing public facilities. The interest received from most municipal bonds is exempt from federal, state or local income taxes in the municipalities where the bonds are issued, however the Fund can invest in municipal securities because the investment adviser believes they offer attractive yields relative to the yields and risks of other debt securities, rather than to seek tax-exempt interest income for distribution to shareholders.           Risks of Investing in Municipal Securities. Municipal securities may be subject to interest rate risk and credit risk. The value of the Fund’s investment in municipal securities will be highly sensitive to events affecting the fiscal stability of the states, municipalities, agencies, authorities and other instrumentalities that issue the municipal securities. In particular, economic, legislative, regulatory or political developments affecting the ability of a state’s issuers to pay interest or repay principal may significantly affect the value of the Fund’s investments in these securities. These developments can include or arise from, for example, insolvency of an issuer, uncertainties related to the tax status of municipal securities, tax base erosion, state constitutional limits on tax increases, budget deficits and other financial difficulties, or changes in the credit ratings assigned to the state’s municipal issuers. Other occurrences, such as catastrophic natural disasters, can also adversely affect a state’s fiscal stability. National economic crises, such as occurred in the latter half of 2008 and early 2009, may cause deterioration in the economies of many states, resulting in an adverse impact on states’ spending, revenues and state budgets that can cause many states to operate under significant financial stress. Risks of Money Market Instruments.The Fund may invest in money market instruments. Money market instruments are short-term, US dollar-denominated debt instruments issued or guaranteed by domestic and foreign corporations and financial institutions, the U.S. government, its agencies and instrumentalities and other entities. Money market instruments include certificates of deposit, commercial paper, repurchase agreements, treasury bills, certain asset-backed securities and other short term debt obligations that have a final maturity, as defined under rules under the Investment Company Act of 1940, of 397 days or less. They may have fixed, variable or floating interest rates. Money market instruments are subject to certain risks, including the risk that an issuer of an obligation that the Fund holds might have its credit rating downgraded or might default on its obligations, or that interest rates might rise sharply, causing the value of the Fund’s investments to fall. Risks of Repurchase Agreements. In a repurchase transaction, the Fund buys a security and simultaneously sells it back to the vendor for delivery at a future date. If the seller fails to pay the repurchase price on the delivery date, the Fund may incur costs in disposing of the collateral and may experience losses if there is any delay in its ability to do so. If the default on the part of the seller is due to its bankruptcy, the Fund’s ability to liquidate the collateral may be delayed or limited. 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. Risks of Hedging. The Fund may engage in “hedging” strategies, including short sales, futures and other derivatives in an effort to protect assets from losses due to declines in the value of the Fund’s portfolio. There are risks in the use of these investment and trading strategies. There can be no assurance that the hedging strategies used will be successful in avoiding losses, and hedged positions may perform less favorably in generally rising markets than unhedged positions. If the Fund uses a hedging strategy at the wrong time or judges market conditions incorrectly, the strategy could reduce the Fund’s return. In some cases, derivatives or other investments may be unavailable, or the investment adviser may choose not to use them under market conditions when their use, in hindsight, may be determined to have been beneficial to the Fund. No assurance can be given that the investment adviser will employ hedging strategies with respect to all or any portion of the Fund’s assets. Risks of Senior Loans. The Fund may invest in floating rate loans (sometimes referred to as “adjustable rate loans”) that hold a senior position in the capital structure of U.S. and foreign corporations, partnerships or other business entities that, under normal circumstances, allow them to have priority of claim ahead of other obligations of a borrower in the event of liquidation. These investments are referred to as “Senior Loans.” Senior Loans may be collateralized or uncollateralized. They typically pay interest at rates that are reset periodically based on a reference benchmark that reflects current interest rates, plus a margin or premium. In addition to the risks typically associated with debt securities, such as credit and interest rate risk, Senior Loans are also subject to the risk that a court could subordinate a Senior Loan, which typically holds a senior position in the capital structure of a borrower, to presently existing or future indebtedness or take other action detrimental to the holders of Senior Loans. Senior Loans usually have mandatory and optional prepayment provisions. If a borrower prepays a Senior Loan, the Fund will have to reinvest the proceeds in other Senior Loans or securities that may pay lower interest rates. Senior Loans are subject to the risk that the value of the collateral, if any, securing a loan may decline, be insufficient to meet the obligations of the borrower, or be difficult to liquidate. In the event of a default, the Fund may have difficulty collecting on any collateral and would not have the ability to collect on any collateral for an uncollateralized loan. In addition, any collateral may be found invalid or may be used to pay other outstanding obligations of the borrower. The Fund’s access to collateral, if any, may be limited by bankruptcy, other insolvency laws, or by the type of loan the Fund has purchased. As a result, a collateralized Senior Loan may not be fully collateralized and can decline significantly in value. Loan investments are often issued in connection with highly leveraged transactions. Such transactions include leveraged buyout loans, leveraged recapitalization loans, and other types of acquisition financing. These obligations are subject to greater credit risks than other investments including a greater possibility that the borrower may default or enter bankruptcy. Due to restrictions on transfers in loan agreements and the nature of the private syndication of Senior Loans including, for example, the lack of publicly-available information, some Senior Loans are not as easily purchased or sold as publicly-traded securities. Some Senior Loans and other Fund investments are illiquid, which may make it difficult for the Fund to value them or dispose of them at an acceptable price when it wants to. Direct investments in Senior Loans and, to a lesser degree, investments in participation interests in or assignments of Senior Loans may be limited. Investments in Senior Loans are expected to be less affected by changes in interest rates than fixed-rate securities. Compared to securities and to certain other types of financial assets, purchases and sales of loans take relatively longer to settle. To the extent the extended loan settlement process gives rise to short-term liquidity needs, such as the need to satisfy redemption requests, the Fund may hold cash, sell investments or temporarily borrow from banks or other lenders. If the Fund undertakes such measures, the Fund’s ability to pay redemption proceeds in a timely manner may be adversely affected, as well as the Fund’s performance. In certain circumstances, loans may not be deemed to be securities, and in the event of fraud or misrepresentation by a borrower or an arranger, lenders will not have the protection of the anti-fraud provisions of the federal securities laws, as would be the case for bonds or stocks. Risks of Investments in Other Investment Companies. As an investor in another investment company, the Fund would be subject to the risks of that investment company’s portfolio. Investing in another investment company may also involve paying a premium above the value of that investment company’s portfolio securities and is subject to a ratable share of that investment company’s expenses, including its advisory and administration expenses. The Fund does not intend to invest in other investment companies unless it is believed that the potential benefits of the investment justify the payment of any premiums, expenses or sales charges. The Investment Company Act of 1940 also imposes limitations on mutual funds’ investments in other investment companies. Who Is the Fund Designed For? The Fund is designed primarily for investors seeking total return from a fund that invests in a variety of fixed income sectors, including government, corporate, securitized and municipal debt. Those investors should be willing to assume the greater risks of short-term share price fluctuations and the special credit risks that are typical for a fund that invests in below-investment grade fixed-income securities and foreign securities. The Fund is not designed for investors needing an assured level of current income. The Fund is intended to be a long-term investment. 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	Performance history will be available after the Fund has been in operation for a full calendar year. While the Fund’s past investment performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future, updated performance information, showing the variability of the Fund’s returns, is 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/GlobalUnconstrainedBondFund
Performance One Year or Less [Text]	rr_PerformanceOneYearOrLess	Performance history will be available after the Fund has been in operation for a full calendar year.
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	https://www.oppenheimerfunds.com/fund/GlobalUnconstrainedBondFund
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	While the Fund’s past investment performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future
Oppenheimer Global Unconstrained Bond 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	0.60%
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other Expenses	rr_OtherExpensesOverAssets	0.46%	[1]
Acquired Fund Fees and Expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.14%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.45%
Fee Waiver and Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.31%)	[2]
Total Annual Fund Operating Expenses after Fee Waiver and Expense Reimbursement	rr_NetExpensesOverAssets	1.14%
1 Year	rr_ExpenseExampleYear01	$ 586
3 Years	rr_ExpenseExampleYear03	886
1 Year	rr_ExpenseExampleNoRedemptionYear01	586
3 Years	rr_ExpenseExampleNoRedemptionYear03	$ 886
Oppenheimer Global Unconstrained Bond Fund | Class C
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	1.00%
Management Fees	rr_ManagementFeesOverAssets	0.60%
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other Expenses	rr_OtherExpensesOverAssets	0.46%	[1]
Acquired Fund Fees and Expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.14%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	2.20%
Fee Waiver and Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.31%)	[2]
Total Annual Fund Operating Expenses after Fee Waiver and Expense Reimbursement	rr_NetExpensesOverAssets	1.89%
1 Year	rr_ExpenseExampleYear01	$ 294
3 Years	rr_ExpenseExampleYear03	665
1 Year	rr_ExpenseExampleNoRedemptionYear01	194
3 Years	rr_ExpenseExampleNoRedemptionYear03	$ 665
Oppenheimer Global Unconstrained Bond 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	0.60%
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	none
Other Expenses	rr_OtherExpensesOverAssets	0.27%	[1]
Acquired Fund Fees and Expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.14%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.01%
Fee Waiver and Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.12%)	[2]
Total Annual Fund Operating Expenses after Fee Waiver and Expense Reimbursement	rr_NetExpensesOverAssets	0.89%
1 Year	rr_ExpenseExampleYear01	$ 91
3 Years	rr_ExpenseExampleYear03	311
1 Year	rr_ExpenseExampleNoRedemptionYear01	91
3 Years	rr_ExpenseExampleNoRedemptionYear03	$ 311
Oppenheimer Global Unconstrained Bond Fund | Class R
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	0.60%
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.50%
Other Expenses	rr_OtherExpensesOverAssets	0.46%	[1]
Acquired Fund Fees and Expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.14%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.70%
Fee Waiver and Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.31%)	[2]
Total Annual Fund Operating Expenses after Fee Waiver and Expense Reimbursement	rr_NetExpensesOverAssets	1.39%
1 Year	rr_ExpenseExampleYear01	$ 142
3 Years	rr_ExpenseExampleYear03	510
1 Year	rr_ExpenseExampleNoRedemptionYear01	142
3 Years	rr_ExpenseExampleNoRedemptionYear03	$ 510
Oppenheimer Global Unconstrained Bond Fund | Class T
Risk/Return:	rr_RiskReturnAbstract
Maximum Sales Charge (Load) imposed on purchases (as % of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	2.50%
Maximum Deferred Sales Charge (Load) (as % of the lower of original offering price or redemption proceeds)	rr_MaximumDeferredSalesChargeOverOther	none
Management Fees	rr_ManagementFeesOverAssets	0.60%
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other Expenses	rr_OtherExpensesOverAssets	0.46%	[1]
Acquired Fund Fees and Expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.14%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.45%
Fee Waiver and Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.31%)	[2]
Total Annual Fund Operating Expenses after Fee Waiver and Expense Reimbursement	rr_NetExpensesOverAssets	1.14%
1 Year	rr_ExpenseExampleYear01	$ 364
3 Years	rr_ExpenseExampleYear03	670
1 Year	rr_ExpenseExampleNoRedemptionYear01	364
3 Years	rr_ExpenseExampleNoRedemptionYear03	$ 670
Oppenheimer Global Unconstrained Bond 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	0.60%
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	none
Other Expenses	rr_OtherExpensesOverAssets	0.46%	[1]
Acquired Fund Fees and Expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.14%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.20%
Fee Waiver and Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.21%)	[2]
Total Annual Fund Operating Expenses after Fee Waiver and Expense Reimbursement	rr_NetExpensesOverAssets	0.99%
1 Year	rr_ExpenseExampleYear01	$ 101
3 Years	rr_ExpenseExampleYear03	362
1 Year	rr_ExpenseExampleNoRedemptionYear01	101
3 Years	rr_ExpenseExampleNoRedemptionYear03	$ 362

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

[2] After discussions with the Fund’s Board of Trustees, the Manager has contractually agreed to waive fees and/or reimburse the Fund for certain expenses in order to limit “Total Annual Fund Operating Expenses After 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) to annual rates of 1.00% for Class A shares, 1.00% for Class T shares, 1.75% for Class C shares, 1.25% for Class R shares, 0.85% for Class Y shares and 0.75% for Class I shares, as calculated on the daily net assets of the Fund. These fee waivers and/or expense reimbursements may not be amended or withdrawn for one year from the date of this prospectus, unless approved by the Board. The Manager will waive fees and/or reimburse Fund expenses in an amount equal to the indirect management fees incurred through the Fund?s investments in funds managed by the Manager or its affiliates.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	OPPENHEIMER INTEGRITY FUNDS
Prospectus Date	rr_ProspectusDate	Jan. 16, 2018
Document Creation Date	dei_DocumentCreationDate	Jan. 17, 2018