485BPOS

Registration No. 2-75276

File No. 811-3346

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC  20549

FORM N-1A

REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933	x
Pre-Effective Amendment No.	o
Post-Effective Amendment No. 57	x
and/or
REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940	x
Amendment No. 58	x

OPPENHEIMER SERIES FUND, INC.

(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)

Arthur S. Gabinet, Esq.

OFI Global Asset Management, Inc.

Two World Financial Center, 225 Liberty Street 11^th Floor, 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):

x Immediately upon filing pursuant to paragraph (b)

o On ____________, pursuant to paragraph (b)

o 60 days after filing, pursuant to paragraph (a)(1)

o On _____________, pursuant to paragraph (a)(1)

o 75 days after filing, pursuant to paragraph (a)(2)

o On ______________, pursuant to paragraph (a)(2) of Rule 485.

If appropriate, check the following box:

o 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 14^th day of March, 2013.

OPPENHEIMER SERIES FUND, INC.
By:	William F. Glavin, Jr.*
	William F. Glavin, Jr., President, Principal Executive Officer and Director

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
Brian F. Wruble*	Chairman of the	March 14, 2013
Brian F. Wruble	Board of Directors
William F. Glavin, Jr.*	President, Principal	March 14, 2013
William F. Glavin, Jr.	Executive Officer and Director
Brian W. Wixted*	Treasurer, Principal	March 14, 2013
Brian W. Wixted	Financial & Accounting Officer
David K. Downes*	Director	March 14, 2013
David K. Downes
Matthew P. Fink*	Director	March 14, 2013
Matthew P. Fink
Phillip A. Griffiths*	Director	March 14, 2013
Phillip A. Griffiths
Mary F. Miller*	Director	March 14, 2013
Mary F. Miller
Joel W. Motley*	Director	March 14, 2013
Joel W. Motley
Mary Ann Tynan*	Director	March 14, 2013
Mary Ann Tynan
Joseph M. Wikler*	Director	March 14, 2013
Joseph M. Wikler
Peter I. Wold*	Director	March 14, 2013
Peter I. Wold

*By:	/s/ Mitchell J. Lindauer
	Mitchell J. Lindauer, 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

Expense Example, No Redemption (dei_DocumentInformationDocumentAxis, (Oppenheimer Value Fund), USD $)	0 Months Ended
	Feb. 28, 2013
Class A
Expense Example, No Redemption:
Expense Example, No Redemption, 1 Year	$ 675
Expense Example, No Redemption, 3 Years	886
Expense Example, No Redemption, 5 Years	1,114
Expense Example, No Redemption, 10 Years	1,768
Class B
Expense Example, No Redemption:
Expense Example, No Redemption, 1 Year	194
Expense Example, No Redemption, 3 Years	655
Expense Example, No Redemption, 5 Years	1,142
Expense Example, No Redemption, 10 Years	1,928
Class C
Expense Example, No Redemption:
Expense Example, No Redemption, 1 Year	183
Expense Example, No Redemption, 3 Years	568
Expense Example, No Redemption, 5 Years	978
Expense Example, No Redemption, 10 Years	2,124
Class I
Expense Example, No Redemption:
Expense Example, No Redemption, 1 Year	52
Expense Example, No Redemption, 3 Years	164
Expense Example, No Redemption, 5 Years	286
Expense Example, No Redemption, 10 Years	642
Class N
Expense Example, No Redemption:
Expense Example, No Redemption, 1 Year	134
Expense Example, No Redemption, 3 Years	418
Expense Example, No Redemption, 5 Years	723
Expense Example, No Redemption, 10 Years	1,589
Class Y
Expense Example, No Redemption:
Expense Example, No Redemption, 1 Year	60
Expense Example, No Redemption, 3 Years	190
Expense Example, No Redemption, 5 Years	330
Expense Example, No Redemption, 10 Years	$ 740

XML

(Oppenheimer Value Fund)

Investment Objective. The Fund seeks long-term growth of capital by investing primarily in common stocks with low price-earnings ratios and better-than-anticipated earnings. Realization of current income is a secondary consideration.

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 11 of the prospectus and in the sections "How to Buy Shares" beginning on page 59 and "Appendix A" in the Fund's Statement of Additional Information.

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees (Oppenheimer Value Fund)	Class A	Class B	Class C	Class N	Class Y	Class I
Maximum Sales Charge (Load) imposed on purchases (as % of offering price)	5.75%	none	none	none	none	none
Maximum Deferred Sales Charge (Load) (as % of the lower of original offering price or redemption proceeds)	none	5.00%	1.00%	1.00%	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 Value Fund)		Class A	Class B	Class C	Class N	Class Y	Class I
Management Fees		0.48%	0.48%	0.48%	0.48%	0.48%	0.48%
Distribution and/or Service (12b-1) Fees		0.25%	1.00%	0.99%	0.49%	none	none
Other Expenses		0.30%	0.67%	0.32%	0.34%	0.11%	0.03%
Total Annual Fund Operating Expenses		1.03%	2.15%	1.79%	1.31%	0.59%	0.51%
Fee Waiver and/or Expense Reimbursement	[1]	none	(0.26%)	none	none	none	none
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement		1.03%	1.89%	1.79%	1.31%	0.59%	0.51%

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:

If shares are redeemed

Expense Example (Oppenheimer Value Fund) (USD $)	1 Year	3 Years	5 Years	10 Years
Class A	675	886	1,114	1,768
Class B	694	955	1,342	1,928
Class C	283	568	978	2,124
Class N	234	418	723	1,589
Class Y	60	190	330	740
Class I	52	164	286	642

If shares are not redeemed

Expense Example, No Redemption (Oppenheimer Value Fund) (USD $)	1 Year	3 Years	5 Years	10 Years
Class A	675	886	1,114	1,768
Class B	194	655	1,142	1,928
Class C	183	568	978	2,124
Class N	134	418	723	1,589
Class Y	60	190	330	740
Class I	52	164	286	642

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 72% of the average value of its portfolio.

Principal Investment Strategies. The Fund mainly invests in common stocks of companies that the portfolio manager believes are undervalued. The Fund may also invest in other equity securities, such as preferred stock, rights, warrants and securities convertible into common stock. The Fund may buy securities issued by companies of any size or market capitalization range and at times might increase its emphasis on securities of issuers in a particular capitalization range. While the Fund does not limit its investments to issuers in a particular capitalization range, the portfolio manager currently focuses on securities of larger-size companies.

The Fund may invest up to 25% of its total assets in foreign securities of companies or governments in any country, including in developed and emerging market countries. The Fund may invest up to 10% of its net assets in debt securities.

In selecting investments for the Fund's portfolio, the portfolio manager looks for companies he believes have been undervalued by the market. 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 portfolio manager uses a "bottom up" approach to select securities one at a time before considering industry trends. The portfolio manager uses fundamental analysis to select securities based on factors such as a company's long-term earnings and growth potential. The portfolio manager currently focuses on companies with the following characteristics, which may vary in particular cases and may change over time:

• Attractive valuation,

• Future supply/demand conditions for its key products,

• Product cycles,

• Quality of management,

• Competitive position in the market place,

• Reinvestment plans for cash generated, and

• Better-than-expected earnings reports.

The portfolio manager also monitors individual issuers for changes in their business fundamentals or prospects that may trigger a decision to sell a security, but does not require a decision to do so. The portfolio manager may consider selling a stock for one or more of the following reasons:

• the stock price is approaching its price target,

• the company's fundamentals are deteriorating, or

• alternative investment ideas have been developed.

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 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.

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 capital appreciation 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 stocks. Since the Fund's income level will fluctuate and will likely be small, it is not designed for investors needing 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.

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 (for Class A Shares) 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/ValueFund

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 19.46% (2nd Qtr 09) and the lowest return was -26.61% (4th Qtr 08). For the period from January 1, 2012 through December 31, 2012 the cumulative return before sales charges and taxes was 13.51%.

Average Annual Total Returns for the periods ended December 31, 2012

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 will be provided after those shares have one full calendar year of performance.

Average Annual Total Returns (Oppenheimer Value Fund)	Inception Date	1 Year	5 Years	10 Years
Class A	Sep. 16, 1985	6.98%	(1.85%)	6.16%
Class A Return After Taxes on Distributions		6.47%	(2.05%)	5.65%
Class A Return After Taxes on Distributions and Sale of Fund Shares		4.53%	(1.60%)	5.27%
Class B	Oct. 02, 1995	7.50%	(1.92%)	6.24%
Class C	May 01, 1996	11.67%	(1.43%)	5.97%
Class N	Mar. 01, 2001	12.24%	(0.95%)	6.47%
Class Y	Dec. 16, 1996	13.97%	(0.28%)	7.24%
S&P 500 Index		16.00%	1.66%	7.10%
Russell 1000 Value Index		17.51%	0.59%	7.38%

[1] 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. These limitations may not be amended or withdrawn until one year after the date of this prospectus.

XML

Expense Example (dei_DocumentInformationDocumentAxis, (Oppenheimer Value Fund), USD $)	0 Months Ended
	Feb. 28, 2013
Class A
Expense Example:
Expense Example, with Redemption, 1 Year	$ 675
Expense Example, with Redemption, 3 Years	886
Expense Example, with Redemption, 5 Years	1,114
Expense Example, with Redemption, 10 Years	1,768
Class B
Expense Example:
Expense Example, with Redemption, 1 Year	694
Expense Example, with Redemption, 3 Years	955
Expense Example, with Redemption, 5 Years	1,342
Expense Example, with Redemption, 10 Years	1,928
Class C
Expense Example:
Expense Example, with Redemption, 1 Year	283
Expense Example, with Redemption, 3 Years	568
Expense Example, with Redemption, 5 Years	978
Expense Example, with Redemption, 10 Years	2,124
Class I
Expense Example:
Expense Example, with Redemption, 1 Year	52
Expense Example, with Redemption, 3 Years	164
Expense Example, with Redemption, 5 Years	286
Expense Example, with Redemption, 10 Years	642
Class N
Expense Example:
Expense Example, with Redemption, 1 Year	234
Expense Example, with Redemption, 3 Years	418
Expense Example, with Redemption, 5 Years	723
Expense Example, with Redemption, 10 Years	1,589
Class Y
Expense Example:
Expense Example, with Redemption, 1 Year	60
Expense Example, with Redemption, 3 Years	190
Expense Example, with Redemption, 5 Years	330
Expense Example, with Redemption, 10 Years	$ 740

XML

Shareholder Fees (dei_DocumentInformationDocumentAxis, (Oppenheimer Value Fund))	0 Months Ended
	Feb. 28, 2013
Class A
Shareholder Fees:
Maximum Sales Charge (Load) imposed on purchases (as % of offering price)	5.75%
Maximum Deferred Sales Charge (Load) (as % of the lower of original offering price or redemption proceeds)	none
Class B
Shareholder Fees:
Maximum Sales Charge (Load) imposed on purchases (as % of offering price)	none
Maximum Deferred Sales Charge (Load) (as % of the lower of original offering price or redemption proceeds)	5.00%
Class C
Shareholder Fees:
Maximum Sales Charge (Load) imposed on purchases (as % of offering price)	none
Maximum Deferred Sales Charge (Load) (as % of the lower of original offering price or redemption proceeds)	1.00%
Class I
Shareholder Fees:
Maximum Sales Charge (Load) imposed on purchases (as % of offering price)	none
Maximum Deferred Sales Charge (Load) (as % of the lower of original offering price or redemption proceeds)	none
Class N
Shareholder Fees:
Maximum Sales Charge (Load) imposed on purchases (as % of offering price)	none
Maximum Deferred Sales Charge (Load) (as % of the lower of original offering price or redemption proceeds)	1.00%
Class Y
Shareholder Fees:
Maximum Sales Charge (Load) imposed on purchases (as % of offering price)	none
Maximum Deferred Sales Charge (Load) (as % of the lower of original offering price or redemption proceeds)	none

XML

(Oppenheimer Value Fund)

Investment Objective. The Fund seeks long-term growth of capital by investing primarily in common stocks with low price-earnings ratios and better-than-anticipated earnings. Realization of current income is a secondary consideration.

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 11 of the prospectus and in the sections "How to Buy Shares" beginning on page 59 and "Appendix A" in the Fund's Statement of Additional Information.

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees (Oppenheimer Value Fund)	Class A	Class B	Class C	Class N	Class Y	Class I
Maximum Sales Charge (Load) imposed on purchases (as % of offering price)	5.75%	none	none	none	none	none
Maximum Deferred Sales Charge (Load) (as % of the lower of original offering price or redemption proceeds)	none	5.00%	1.00%	1.00%	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 Value Fund)		Class A	Class B	Class C	Class N	Class Y	Class I
Management Fees		0.48%	0.48%	0.48%	0.48%	0.48%	0.48%
Distribution and/or Service (12b-1) Fees		0.25%	1.00%	0.99%	0.49%	none	none
Other Expenses		0.30%	0.67%	0.32%	0.34%	0.11%	0.03%
Total Annual Fund Operating Expenses		1.03%	2.15%	1.79%	1.31%	0.59%	0.51%
Fee Waiver and/or Expense Reimbursement	[1]	none	(0.26%)	none	none	none	none
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement		1.03%	1.89%	1.79%	1.31%	0.59%	0.51%

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:

If shares are redeemed

Expense Example (Oppenheimer Value Fund) (USD $)	1 Year	3 Years	5 Years	10 Years
Class A	675	886	1,114	1,768
Class B	694	955	1,342	1,928
Class C	283	568	978	2,124
Class N	234	418	723	1,589
Class Y	60	190	330	740
Class I	52	164	286	642

If shares are not redeemed

Expense Example, No Redemption (Oppenheimer Value Fund) (USD $)	1 Year	3 Years	5 Years	10 Years
Class A	675	886	1,114	1,768
Class B	194	655	1,142	1,928
Class C	183	568	978	2,124
Class N	134	418	723	1,589
Class Y	60	190	330	740
Class I	52	164	286	642

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 72% of the average value of its portfolio.

Principal Investment Strategies. The Fund mainly invests in common stocks of companies that the portfolio manager believes are undervalued. The Fund may also invest in other equity securities, such as preferred stock, rights, warrants and securities convertible into common stock. The Fund may buy securities issued by companies of any size or market capitalization range and at times might increase its emphasis on securities of issuers in a particular capitalization range. While the Fund does not limit its investments to issuers in a particular capitalization range, the portfolio manager currently focuses on securities of larger-size companies.

The Fund may invest up to 25% of its total assets in foreign securities of companies or governments in any country, including in developed and emerging market countries. The Fund may invest up to 10% of its net assets in debt securities.

In selecting investments for the Fund's portfolio, the portfolio manager looks for companies he believes have been undervalued by the market. 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 portfolio manager uses a "bottom up" approach to select securities one at a time before considering industry trends. The portfolio manager uses fundamental analysis to select securities based on factors such as a company's long-term earnings and growth potential. The portfolio manager currently focuses on companies with the following characteristics, which may vary in particular cases and may change over time:

• Attractive valuation,

• Future supply/demand conditions for its key products,

• Product cycles,

• Quality of management,

• Competitive position in the market place,

• Reinvestment plans for cash generated, and

• Better-than-expected earnings reports.

The portfolio manager also monitors individual issuers for changes in their business fundamentals or prospects that may trigger a decision to sell a security, but does not require a decision to do so. The portfolio manager may consider selling a stock for one or more of the following reasons:

• the stock price is approaching its price target,

• the company's fundamentals are deteriorating, or

• alternative investment ideas have been developed.

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 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.

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 capital appreciation 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 stocks. Since the Fund's income level will fluctuate and will likely be small, it is not designed for investors needing 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.

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 (for Class A Shares) 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/ValueFund

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 19.46% (2nd Qtr 09) and the lowest return was -26.61% (4th Qtr 08). For the period from January 1, 2012 through December 31, 2012 the cumulative return before sales charges and taxes was 13.51%.

Average Annual Total Returns for the periods ended December 31, 2012

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 will be provided after those shares have one full calendar year of performance.

Average Annual Total Returns (Oppenheimer Value Fund)	Inception Date	1 Year	5 Years	10 Years
Class A	Sep. 16, 1985	6.98%	(1.85%)	6.16%
Class A Return After Taxes on Distributions		6.47%	(2.05%)	5.65%
Class A Return After Taxes on Distributions and Sale of Fund Shares		4.53%	(1.60%)	5.27%
Class B	Oct. 02, 1995	7.50%	(1.92%)	6.24%
Class C	May 01, 1996	11.67%	(1.43%)	5.97%
Class N	Mar. 01, 2001	12.24%	(0.95%)	6.47%
Class Y	Dec. 16, 1996	13.97%	(0.28%)	7.24%
S&P 500 Index		16.00%	1.66%	7.10%
Russell 1000 Value Index		17.51%	0.59%	7.38%

[1] 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. These limitations may not be amended or withdrawn until one year after the date of this prospectus.

XML

Annual Total Returns (dei_DocumentInformationDocumentAxis, (Oppenheimer Value Fund), Class A)	0 Months Ended
	Feb. 28, 2013
(Oppenheimer Value Fund) | Class A
Bar Chart Table:
Annual Return 2003	32.22%
Annual Return 2004	15.25%
Annual Return 2005	6.45%
Annual Return 2006	15.79%
Annual Return 2007	6.32%
Annual Return 2008	(41.69%)
Annual Return 2009	33.65%
Annual Return 2010	14.70%
Annual Return 2011	(4.76%)
Annual Return 2012	13.51%

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Document Type

dei_DocumentType

485BPOS

Document Period End Date

dei_DocumentPeriodEndDate

Oct. 31, 2012

Registrant Name

dei_EntityRegistrantName

OPPENHEIMER SERIES FUND INC

Central Index Key

dei_EntityCentralIndexKey

0000356865

Amendment Flag

dei_AmendmentFlag

false

Document Creation Date

dei_DocumentCreationDate

Feb. 27, 2013

Document Effective Date

dei_DocumentEffectiveDate

Feb. 28, 2013

Prospectus Date

rr_ProspectusDate

Feb. 28, 2013

(Oppenheimer Value Fund)

Risk/Return:

rr_RiskReturnAbstract

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

Investment Objective. The Fund seeks long-term growth of capital by investing primarily in common stocks with low price-earnings ratios and better-than-anticipated earnings. Realization of current income is a secondary consideration.

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 11 of the prospectus and in the sections "How to Buy Shares" beginning on page 59 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 72% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

72.00%

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 companies that the portfolio manager believes are undervalued. The Fund may also invest in other equity securities, such as preferred stock, rights, warrants and securities convertible into common stock. The Fund may buy securities issued by companies of any size or market capitalization range and at times might increase its emphasis on securities of issuers in a particular capitalization range. While the Fund does not limit its investments to issuers in a particular capitalization range, the portfolio manager currently focuses on securities of larger-size companies.

The Fund may invest up to 25% of its total assets in foreign securities of companies or governments in any country, including in developed and emerging market countries. The Fund may invest up to 10% of its net assets in debt securities.

In selecting investments for the Fund's portfolio, the portfolio manager looks for companies he believes have been undervalued by the market. 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 portfolio manager uses a "bottom up" approach to select securities one at a time before considering industry trends. The portfolio manager uses fundamental analysis to select securities based on factors such as a company's long-term earnings and growth potential. The portfolio manager currently focuses on companies with the following characteristics, which may vary in particular cases and may change over time:

• Attractive valuation,

• Future supply/demand conditions for its key products,

• Product cycles,

• Quality of management,

• Competitive position in the market place,

• Reinvestment plans for cash generated, and

• Better-than-expected earnings reports.

The portfolio manager also monitors individual issuers for changes in their business fundamentals or prospects that may trigger a decision to sell a security, but does not require a decision to do so. The portfolio manager may consider selling a stock for one or more of the following reasons:

• the stock price is approaching its price target,

• the company's fundamentals are deteriorating, or

• alternative investment ideas have been developed.

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 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.

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 capital appreciation 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 stocks. Since the Fund's income level will fluctuate and will likely be small, it is not designed for investors needing 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 (for Class A Shares) 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/ValueFund

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

https://www.oppenheimerfunds.com/fund/ValueFund

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

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 19.46% (2nd Qtr 09) and the lowest return was -26.61% (4th Qtr 08). For the period from January 1, 2012 through December 31, 2012 the cumulative return before sales charges and taxes was 13.51%.

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns for the periods ended December 31, 2012

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 will be provided after those shares have one full calendar year of performance.

(Oppenheimer Value Fund) | S&P 500 Index

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

16.00%

5 Years

rr_AverageAnnualReturnYear05

1.66%

10 Years

rr_AverageAnnualReturnYear10

7.10%

(Oppenheimer Value Fund) | Russell 1000 Value Index

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

17.51%

5 Years

rr_AverageAnnualReturnYear05

0.59%

10 Years

rr_AverageAnnualReturnYear10

7.38%

(Oppenheimer Value Fund) | 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_MaximumDeferredSalesChargeOverOther

none

Management Fees

rr_ManagementFeesOverAssets

0.48%

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other Expenses

rr_OtherExpensesOverAssets

0.30%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.03%

Fee Waiver and/or Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

none

^[1]

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement

rr_NetExpensesOverAssets

1.03%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

675

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

886

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,114

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,768

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

675

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

886

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

1,114

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,768

Annual Return 2003

rr_AnnualReturn2003

32.22%

Annual Return 2004

rr_AnnualReturn2004

15.25%

Annual Return 2005

rr_AnnualReturn2005

6.45%

Annual Return 2006

rr_AnnualReturn2006

15.79%

Annual Return 2007

rr_AnnualReturn2007

6.32%

Annual Return 2008

rr_AnnualReturn2008

(41.69%)

Annual Return 2009

rr_AnnualReturn2009

33.65%

Annual Return 2010

rr_AnnualReturn2010

14.70%

Annual Return 2011

rr_AnnualReturn2011

(4.76%)

Annual Return 2012

rr_AnnualReturn2012

13.51%

Year to Date Return, Label

rr_YearToDateReturnLabel

For the period from January 1, 2012 through December 31, 2012 the cumulative return before sales charges and taxes was 13.51%.

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Dec. 31, 2012

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

13.51%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

highest return for a calendar quarter was 19.46% (2nd Qtr 09)

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

19.46%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

lowest return was -26.61% (4th Qtr 08)

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(26.61%)

1 Year

rr_AverageAnnualReturnYear01

6.98%

5 Years

rr_AverageAnnualReturnYear05

(1.85%)

10 Years

rr_AverageAnnualReturnYear10

6.16%

Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 16, 1985

(Oppenheimer Value Fund) | Class A | Return After Taxes on Distributions

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

6.47%

5 Years

rr_AverageAnnualReturnYear05

(2.05%)

10 Years

rr_AverageAnnualReturnYear10

5.65%

(Oppenheimer Value Fund) | Class A | Return After Taxes on Distributions and Sale of Fund Shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

4.53%

5 Years

rr_AverageAnnualReturnYear05

(1.60%)

10 Years

rr_AverageAnnualReturnYear10

5.27%

(Oppenheimer Value Fund) | 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_MaximumDeferredSalesChargeOverOther

5.00%

Management Fees

rr_ManagementFeesOverAssets

0.48%

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other Expenses

rr_OtherExpensesOverAssets

0.67%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

2.15%

Fee Waiver and/or Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.26%)

^[1]

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement

rr_NetExpensesOverAssets

1.89%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

694

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

955

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,342

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,928

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

194

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

655

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

1,142

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,928

1 Year

rr_AverageAnnualReturnYear01

7.50%

5 Years

rr_AverageAnnualReturnYear05

(1.92%)

10 Years

rr_AverageAnnualReturnYear10

6.24%

Inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 02, 1995

(Oppenheimer Value 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

0.48%

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.99%

Other Expenses

rr_OtherExpensesOverAssets

0.32%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.79%

Fee Waiver and/or Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

none

^[1]

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement

rr_NetExpensesOverAssets

1.79%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

283

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

568

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

978

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,124

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

183

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

568

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

978

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

2,124

1 Year

rr_AverageAnnualReturnYear01

11.67%

5 Years

rr_AverageAnnualReturnYear05

(1.43%)

10 Years

rr_AverageAnnualReturnYear10

5.97%

Inception Date

rr_AverageAnnualReturnInceptionDate

May 01, 1996

(Oppenheimer Value 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

0.48%

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.03%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.51%

Fee Waiver and/or Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

none

^[1]

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement

rr_NetExpensesOverAssets

0.51%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

52

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

164

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

286

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

642

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

52

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

164

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

286

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

642

(Oppenheimer Value Fund) | 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_MaximumDeferredSalesChargeOverOther

1.00%

Management Fees

rr_ManagementFeesOverAssets

0.48%

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.49%

Other Expenses

rr_OtherExpensesOverAssets

0.34%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.31%

Fee Waiver and/or Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

none

^[1]

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement

rr_NetExpensesOverAssets

1.31%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

234

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

418

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

723

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,589

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

134

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

418

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

723

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,589

1 Year

rr_AverageAnnualReturnYear01

12.24%

5 Years

rr_AverageAnnualReturnYear05

(0.95%)

10 Years

rr_AverageAnnualReturnYear10

6.47%

Inception Date

rr_AverageAnnualReturnInceptionDate

Mar. 01, 2001

(Oppenheimer Value 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

0.48%

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.11%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.59%

Fee Waiver and/or Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

none

^[1]

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement

rr_NetExpensesOverAssets

0.59%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

60

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

190

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

330

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

740

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

60

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

190

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

330

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

740

1 Year

rr_AverageAnnualReturnYear01

13.97%

5 Years

rr_AverageAnnualReturnYear05

(0.28%)

10 Years

rr_AverageAnnualReturnYear10

7.24%

Inception Date

rr_AverageAnnualReturnInceptionDate

Dec. 16, 1996

[1] 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. These limitations may not be amended or withdrawn until one year after the date of this prospectus.

XML

Average Annual Total Returns (dei_DocumentInformationDocumentAxis, (Oppenheimer Value Fund))	0 Months Ended
	Feb. 28, 2013
S&P 500 Index
Average Annual Return:
1 Year	16.00%
5 Years	1.66%
10 Years	7.10%
Russell 1000 Value Index
Average Annual Return:
1 Year	17.51%
5 Years	0.59%
10 Years	7.38%
Class A
Average Annual Return:
1 Year	6.98%
5 Years	(1.85%)
10 Years	6.16%
Inception Date	Sep. 16, 1985
Class A | Return After Taxes on Distributions
Average Annual Return:
1 Year	6.47%
5 Years	(2.05%)
10 Years	5.65%
Class A | Return After Taxes on Distributions and Sale of Fund Shares
Average Annual Return:
1 Year	4.53%
5 Years	(1.60%)
10 Years	5.27%
Class B
Average Annual Return:
1 Year	7.50%
5 Years	(1.92%)
10 Years	6.24%
Inception Date	Oct. 02, 1995
Class C
Average Annual Return:
1 Year	11.67%
5 Years	(1.43%)
10 Years	5.97%
Inception Date	May 01, 1996
Class N
Average Annual Return:
1 Year	12.24%
5 Years	(0.95%)
10 Years	6.47%
Inception Date	Mar. 01, 2001
Class Y
Average Annual Return:
1 Year	13.97%
5 Years	(0.28%)
10 Years	7.24%
Inception Date	Dec. 16, 1996

XML

Annual Fund Operating Expenses (dei_DocumentInformationDocumentAxis, (Oppenheimer Value Fund))	0 Months Ended
	Feb. 28, 2013
Class A
Operating Expenses:
Management Fees	0.48%
Distribution and/or Service (12b-1) Fees	0.25%
Other Expenses	0.30%
Total Annual Fund Operating Expenses	1.03%
Fee Waiver and/or Expense Reimbursement	none	[1]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement	1.03%
Class B
Operating Expenses:
Management Fees	0.48%
Distribution and/or Service (12b-1) Fees	1.00%
Other Expenses	0.67%
Total Annual Fund Operating Expenses	2.15%
Fee Waiver and/or Expense Reimbursement	(0.26%)	[1]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement	1.89%
Class C
Operating Expenses:
Management Fees	0.48%
Distribution and/or Service (12b-1) Fees	0.99%
Other Expenses	0.32%
Total Annual Fund Operating Expenses	1.79%
Fee Waiver and/or Expense Reimbursement	none	[1]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement	1.79%
Class I
Operating Expenses:
Management Fees	0.48%
Distribution and/or Service (12b-1) Fees	none
Other Expenses	0.03%
Total Annual Fund Operating Expenses	0.51%
Fee Waiver and/or Expense Reimbursement	none	[1]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement	0.51%
Class N
Operating Expenses:
Management Fees	0.48%
Distribution and/or Service (12b-1) Fees	0.49%
Other Expenses	0.34%
Total Annual Fund Operating Expenses	1.31%
Fee Waiver and/or Expense Reimbursement	none	[1]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement	1.31%
Class Y
Operating Expenses:
Management Fees	0.48%
Distribution and/or Service (12b-1) Fees	none
Other Expenses	0.11%
Total Annual Fund Operating Expenses	0.59%
Fee Waiver and/or Expense Reimbursement	none	[1]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement	0.59%

[1] 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. These limitations may not be amended or withdrawn until one year after the date of this prospectus.