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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Document Type dei_DocumentType 485BPOS
Document Period End Date dei_DocumentPeriodEndDate Oct. 31, 2011
Registrant Name dei_EntityRegistrantName Oppenheimer Equity Income Fund Inc.
Central Index Key dei_EntityCentralIndexKey 0000799029
Amendment Flag dei_AmendmentFlag false
Document Creation Date dei_DocumentCreationDate Feb. 27, 2012
Document Effective Date dei_DocumentEffectiveDate Feb. 28, 2012
Prospectus Date rr_ProspectusDate Feb. 28, 2012
(Oppenheimer Equity Income Fund Inc.)
  
Risk/Return: rr_RiskReturnAbstract  
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

Investment Objective. The Fund seeks total return.
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

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 $25,000 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 10 of the prospectus and in the sections "How to Buy Shares" beginning on page 53 and "Appendix A" 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)
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock

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. During the most recent fiscal year, the Fund's portfolio turnover rate was 37% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 37.00%
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 $25,000 in certain funds in the Oppenheimer family of funds.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount 25,000
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

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. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your 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 Narrative [Text Block] rr_StrategyNarrativeTextBlock

Principal Investment Strategies. The Fund mainly invests in common stocks of U.S. companies that the portfolio manager believes are undervalued. Under normal circumstances, the Fund will invest at least 80% of its assets in equity securities. The Fund may invest in other equity securities, such as preferred stocks, warrants and securities convertible into common stocks. The Fund may invest in equity securities issued by companies of different capitalization ranges, but will typically focus on larger capitalization stocks. The Fund may invest in equity securities both for current income from dividends as well as for growth opportunities.

The Fund can buy securities of companies in developed and emerging market countries. The Fund has no limits on the amounts it can invest in foreign securities. However, currently it does not intend to invest more than 25% of its net assets in securities of issuers in any single foreign country or more than 5% of its net assets in companies or government issuers in emerging market countries.

In selecting investments for the Fund, the portfolio manager mainly relies on a value-oriented investing style. A security may be undervalued because the market is not aware of the issuer's intrinsic value, does not yet recognize its future potential, or the issuer may be temporarily out of favor. The Fund seeks to realize gains in the prices of those securities when other investors recognize their real or prospective worth. The Fund also looks for securities that offer higher than average dividends. The portfolio manager generally uses a fundamental approach to analyzing issuers, for example, by looking at price/earnings ratios and current balance sheet information. Currently, the portfolio manager focuses on securities that have high current income and are believed to have substantial earnings possibilities, have low price/earnings ratios relative to other securities, and that have a low price relative to the underlying value of the issuer's assets, earnings, cash flow or other factors. These criteria may vary in particular cases and may change over time. The Fund may sell securities that the portfolio manager believes no longer meet these criteria, but is not required to do so.
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

Principal Risks. The price of the Fund's shares can go up and down substantially. The value of the Fund's investments may change because of broad 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 more or less than what you paid for them. These risks mean that you can lose money by investing in the Fund.

Main Risks of Investing in Stock. The value of the Fund's portfolio may be affected by changes in the stock markets. Stock markets may experience significant short-term volatility and may fall sharply at times. Different stock markets may behave differently from each other and U.S. stock markets may move in the opposite direction from one or more foreign stock markets.

The prices of individual stocks generally do not all move in the same direction at the same time and a variety of factors can affect the price of a particular company's stock. These factors may include, but are not limited to: poor earnings reports, a loss of customers, litigation against the company, general unfavorable performance of the company's sector or industry, or changes in government regulations affecting the company or its industry.

At times, the Fund may emphasize investments in a particular industry or economic or market sector. To the extent that the Fund increases its emphasis on investments in a particular industry or sector, the value of its investments may fluctuate more in response to events affecting that industry or sector, such as changes in economic conditions, government regulations, availability of basic resources or supplies, or other events that affect that industry or sector more than others.

Main 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. Preferred stock generally rank behind debt securities in claims for dividends and assets of the issuer in a liquidation or bankruptcy. 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.

Main Risks of Small- and Mid-Sized Companies. The stock prices of small- and mid-sized companies may be more volatile and their securities may be more difficult to sell than those of larger companies. They may not have established markets, may have fewer customers and product lines, may have unseasoned management or less management depth and may have more limited access to financial resources. Smaller companies may not pay dividends or provide capital gains for some time, if at all.

Main Risks of Value Investing. Value investing entails the risk that if the market does not recognize that the Fund's securities are undervalued, the prices of those securities might not appreciate as anticipated. A value approach could also result in fewer investments that increase rapidly during times of market gains and could cause the Fund to underperform funds that use a growth or non-value approach to investing. Value investing has gone in and out of favor during past market cycles and when value investing is out of favor or when markets are unstable, the securities of "value" companies may underperform the securities of "growth" companies.

Dividend Risk. There is no guarantee that the issuers of the stocks held by the Fund will declare dividends in the future or that, if dividends are declared, they will remain at their current levels or increase over time. High-dividend stocks may not experience high earnings growth or capital appreciation. The Fund's performance during a broad market advance could suffer because dividend paying stocks may not experience the same capital appreciation as non-dividend paying stocks.

Main Risks of Foreign Investing. Foreign securities are subject to special risks. 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 securities denominated in that foreign currency and in the value of any income or distributions the Fund may receive on those securities. 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. These risks may be greater for investments in developing or emerging market countries.

Time-Zone Arbitrage. The Fund may invest in securities of foreign issuers that are traded in U.S. or foreign markets. If the Fund invests a significant amount of its assets in foreign markets, it may be exposed to "time-zone arbitrage" attempts by investors seeking to take advantage of differences in the values of foreign securities that might result from events that occur after the close of the foreign securities market on which a security is traded and before the Fund's net asset value is calculated. If such time-zone arbitrage were successful, it might dilute the interests of other shareholders. The Fund's use of "fair value pricing" to adjust certain market prices of foreign securities may help deter those activities.

Who Is the Fund Designed For? The Fund is designed primarily for investors seeking total return from capital appreciation and income over the long term. Those investors should be willing to assume the risks of short-term share price fluctuations and losses that are typical for a fund emphasizing 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 The price of the Fund's shares can go up and down substantially. The value of the Fund's investments may change because of broad 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 more or less than what you paid for them. 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.
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The Fund's Past Performance. The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year and by showing how the Fund's average annual returns for 1, 5 and 10 years compare with those of a broad measure of market performance. The Fund's past investment performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. More recent performance information is available by calling the toll-free number on the back of this prospectus and on the Fund's website: https://www.oppenheimerfunds.com/fund/investors/overview/EquityIncomeFundInc

Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1.800.225.5677
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress More recent performance information is available by calling the toll-free number on the back of this prospectus and on the Fund's website: https://www.oppenheimerfunds.com/fund/investors/overview/EquityIncomeFundInc
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Fund's past investment performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

Sales charges and taxes are not included and the returns would be lower if they were. During the period shown, the highest return for a calendar quarter was 25.27% (2nd Qtr 09) and the lowest return was -19.61% (3rd Qtr 11). For the period from January 1, 2011 to December 31, 2011 the cumulative return before taxes was -6.43%.
Performance Table Heading rr_PerformanceTableHeading

Average Annual Total Returns for the periods ended December 31, 2011
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the highest individual federal marginal income tax rates and do not reflect the impact of state or local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Your actual after-tax returns, depending on your individual tax situation, may differ from those shown and after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for only one class and after-tax returns for other classes will vary.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock

The following table shows the average annual total returns for each class of the Fund's shares. After-tax returns are calculated using the highest individual federal marginal income tax rates and do not reflect the impact of state or local taxes. Your actual after-tax returns, depending on your individual tax situation, may differ from those shown and after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for only one class and after-tax returns for other classes will vary.

Performance information for Class I shares is not provided because those shares were not available prior to the date of this prospectus.

No performance information is included for Class Y shares because they do not yet have one calendar year of performance.
(Oppenheimer Equity Income Fund Inc.) | S&P 500 Index
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 2.11%
5 Years rr_AverageAnnualReturnYear05 (0.25%)
10 Years rr_AverageAnnualReturnYear10 2.92%
(Oppenheimer Equity Income Fund Inc.) | Russell 1000 Value Index
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 0.39%
5 Years rr_AverageAnnualReturnYear05 (2.64%)
10 Years rr_AverageAnnualReturnYear10 3.89%
(Oppenheimer Equity Income Fund Inc.) | Class A
  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) imposed on purchases (as % of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.75%
Maximum Deferred Sales Charge (Load) (as % of the lower of original offering price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management Fees rr_ManagementFeesOverAssets 0.62%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.22%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.09%
Fee Waiver and Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets none [2]
Total Annual Fund Operating Expenses After Fee Waiver and Expense Reimbursement rr_NetExpensesOverAssets 1.09%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 680
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 903
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,144
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,834
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 680
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 903
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,144
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 1,834
Annual Return 2002 rr_AnnualReturn2002 (14.71%)
Annual Return 2003 rr_AnnualReturn2003 28.63%
Annual Return 2004 rr_AnnualReturn2004 16.68%
Annual Return 2005 rr_AnnualReturn2005 9.25%
Annual Return 2006 rr_AnnualReturn2006 13.56%
Annual Return 2007 rr_AnnualReturn2007 2.55%
Annual Return 2008 rr_AnnualReturn2008 (35.56%)
Annual Return 2009 rr_AnnualReturn2009 42.22%
Annual Return 2010 rr_AnnualReturn2010 20.86%
Annual Return 2011 rr_AnnualReturn2011 (6.43%)
Year to Date Return, Label rr_YearToDateReturnLabel For the period from January 1, 2011 to December 31, 2011 the cumulative return before taxes was -6.43%.
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn (6.43%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel the highest return for a calendar quarter was 25.27% (2nd Qtr 09)
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 25.27%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel the lowest return was -19.61% (3rd Qtr 11)
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (19.61%)
1 Year rr_AverageAnnualReturnYear01 (11.81%)
5 Years rr_AverageAnnualReturnYear05 0.03%
10 Years rr_AverageAnnualReturnYear10 4.75%
Inception Date rr_AverageAnnualReturnInceptionDate Feb. 13, 1987
(Oppenheimer Equity Income Fund Inc.) | Class A | Return After Taxes on Distributions
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (12.25%)
5 Years rr_AverageAnnualReturnYear05 (0.95%)
10 Years rr_AverageAnnualReturnYear10 3.73%
(Oppenheimer Equity Income Fund Inc.) | Class A | Return After Taxes on Distributions and Sale of Fund Shares
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (7.23%)
5 Years rr_AverageAnnualReturnYear05 (0.20%)
10 Years rr_AverageAnnualReturnYear10 3.86%
(Oppenheimer Equity Income Fund Inc.) | Class B
  
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_MaximumDeferredSalesChargeOverOfferingPrice 5.00%
Management Fees rr_ManagementFeesOverAssets 0.62%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses rr_OtherExpensesOverAssets 0.44%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.06%
Fee Waiver and Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.04%) [2]
Total Annual Fund Operating Expenses After Fee Waiver and Expense Reimbursement rr_NetExpensesOverAssets 2.02%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 707
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 948
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,316
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,924
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 207
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 648
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,116
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 1,924
1 Year rr_AverageAnnualReturnYear01 (11.85%)
5 Years rr_AverageAnnualReturnYear05 0.02%
10 Years rr_AverageAnnualReturnYear10 4.84%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 03, 1997
(Oppenheimer Equity Income Fund Inc.) | 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_MaximumDeferredSalesChargeOverOfferingPrice 1.00%
Management Fees rr_ManagementFeesOverAssets 0.62%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses rr_OtherExpensesOverAssets 0.24%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.86%
Fee Waiver and Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets none [2]
Total Annual Fund Operating Expenses After Fee Waiver and Expense Reimbursement rr_NetExpensesOverAssets 1.86%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 291
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 590
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,015
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,200
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 191
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 590
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,015
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 2,200
1 Year rr_AverageAnnualReturnYear01 (8.05%)
5 Years rr_AverageAnnualReturnYear05 0.39%
10 Years rr_AverageAnnualReturnYear10 4.50%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 03, 1997
(Oppenheimer Equity Income Fund Inc.) | 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_MaximumDeferredSalesChargeOverOfferingPrice none
Management Fees rr_ManagementFeesOverAssets 0.62% [1]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none [1]
Other Expenses rr_OtherExpensesOverAssets 0.05% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.67% [1]
Fee Waiver and Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets none [1],[2]
Total Annual Fund Operating Expenses After Fee Waiver and Expense Reimbursement rr_NetExpensesOverAssets 0.67% [1]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 69 [3]
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 215 [3]
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 374 [3]
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 837 [3]
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 69 [3]
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 215 [3]
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 374 [3]
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 837 [3]
(Oppenheimer Equity Income Fund Inc.) | Class N
  
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_MaximumDeferredSalesChargeOverOfferingPrice 1.00%
Management Fees rr_ManagementFeesOverAssets 0.62%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.50%
Other Expenses rr_OtherExpensesOverAssets 0.43%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.55%
Fee Waiver and Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.05%) [2]
Total Annual Fund Operating Expenses After Fee Waiver and Expense Reimbursement rr_NetExpensesOverAssets 1.50%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 254
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 488
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 846
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,855
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 154
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 488
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 846
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 1,855
1 Year rr_AverageAnnualReturnYear01 (7.77%)
5 Years rr_AverageAnnualReturnYear05 0.83%
10 Years rr_AverageAnnualReturnYear10 4.98%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 01, 2001
(Oppenheimer Equity Income Fund Inc.) | 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_MaximumDeferredSalesChargeOverOfferingPrice none
Management Fees rr_ManagementFeesOverAssets 0.62%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.18%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.80%
Fee Waiver and Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets none [2]
Total Annual Fund Operating Expenses After Fee Waiver and Expense Reimbursement rr_NetExpensesOverAssets 0.80%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 82
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 256
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 446
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 994
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 82
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 256
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 446
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 994
[1] Estimated expenses for the first full year that Class I shares are offered. Class I shares will first be offered on the date of this prospectus.
[2] The Fund's transfer agent has voluntarily agreed to limit its fees for Classes B, C, N and Y to 0.35% of average annual net assets per class per fiscal year, and to 0.30% of average annual net assets per fiscal year for Class A. This limitation may not be amended or withdrawn until one year after the date of this prospectus.
[3] Based on estimated expenses for Class I shares for the first fiscal year.