Label |
Element |
Value |
Risk Return Abstract |
rr_RiskReturnAbstract |
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Registrant Name |
dei_EntityRegistrantName |
NORTHWESTERN MUTUAL SERIES FUND, INC.
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Prospectus Date |
rr_ProspectusDate |
May 01, 2025
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Small Cap Growth Stock Portfolio |
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Risk Return Abstract |
rr_RiskReturnAbstract |
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Risk/Return [Heading] |
rr_RiskReturnHeading |
Small Cap Growth Stock Portfolio – Summary
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Objective [Heading] |
rr_ObjectiveHeading |
<span style="color:#000000;font-family:Arial;font-size:10.02pt;font-weight:bold;">INVESTMENT OBJECTIVE</span>
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Objective, Primary [Text Block] |
rr_ObjectivePrimaryTextBlock |
The investment objective of the Portfolio is long-term growth of capital.
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Expense [Heading] |
rr_ExpenseHeading |
<span style="color:#000000;font-family:Arial;font-size:10.02pt;font-weight:bold;">FEES AND EXPENSES OF THE PORTFOLIO</span>
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Expense Narrative [Text Block] |
rr_ExpenseNarrativeTextBlock |
The table below describes the fees and expenses that you may pay when you buy, hold, and sell interests in a separate account that invests in shares of the Portfolio as a result of your purchase of a variable annuity contract or variable life insurance policy. The fees and expenses shown in the table and Example do not reflect fees and expenses separately charged by variable annuity contracts or variable life insurance policies. If the fees and expenses separately charged by variable annuity contracts and variable life insurance policies were included, the fees and expenses shown in the table and the Example would be higher.
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Shareholder Fees Caption [Text] |
rr_ShareholderFeesCaption |
<span style="color:#000000;font-family:Times New Roman;font-size:10.02pt;font-style:italic;font-weight:bold;margin-left:0.0pt;">Shareholder Fees</span><span style="color:#000000;font-family:Times New Roman;font-size:10.02pt;margin-left:0.0pt;">(fees paid directly from your investment)</span>
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Operating Expenses Caption [Text] |
rr_OperatingExpensesCaption |
<span style="color:#000000;font-family:Times New Roman;font-size:10.02pt;font-style:italic;font-weight:bold;margin-left:0.0pt;">Annual Portfolio Operating Expenses</span><span style="color:#000000;font-family:Times New Roman;font-size:10.02pt;margin-left:0.0pt;">(expenses that you pay each year as a percentage </span><span style="color:#000000;font-family:Times New Roman;font-size:10.02pt;margin-left:0.0pt;">of the value of your investment)</span>
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Portfolio Turnover [Heading] |
rr_PortfolioTurnoverHeading |
<span style="color:#000000;font-family:Times New Roman;font-size:10pt;font-style:italic;font-weight:bold;">Portfolio Turnover</span>
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Portfolio Turnover [Text Block] |
rr_PortfolioTurnoverTextBlock |
The Portfolio pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover may indicate higher transaction costs. These costs, which are not reflected in Annual Portfolio Operating Expenses or in the Example, affect the Portfolio’s performance. During the most recent fiscal year, the Portfolio’s portfolio turnover rate was 67.99% of the average value of its portfolio.
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Portfolio Turnover, Rate |
rr_PortfolioTurnoverRate |
67.99%
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Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] |
rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees |
<span style="color:#000000;font-family:Times New Roman;font-size:10.02pt;">Includes fees and expenses incurred indirectly by the Portfolio as a result of investments in other investment companies (Acquired Fund Fees and Expenses). The operating expenses of the Portfolio reflected in the Portfolio's most recent annual report and Financial Highlights do not include the Acquired Fund Fees and Expenses.</span>
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Expense Example [Heading] |
rr_ExpenseExampleHeading |
<span style="color:#000000;font-family:Times New Roman;font-size:10pt;font-style:italic;font-weight:bold;">Example</span>
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Expense Example Narrative [Text Block] |
rr_ExpenseExampleNarrativeTextBlock |
This Example is intended to help you compare the cost of investing in the Portfolio with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Portfolio for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Portfolio’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
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Strategy [Heading] |
rr_StrategyHeading |
<span style="color:#000000;font-family:Arial;font-size:10.02pt;font-weight:bold;">PRINCIPAL INVESTMENT STRATEGIES</span>
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Strategy Narrative [Text Block] |
rr_StrategyNarrativeTextBlock |
Normally, the Portfolio invests at least 80% of net assets (plus any borrowings for investment purposes) in stocks of small-capitalization growth companies. For purposes of the Portfolio, small-capitalization companies are those companies with market capitalizations within the capitalization range of the Russell 2000® and S&P SmallCap 600® Indices. As of March 31, 2025, this range was approximately $5.20 million to $14.96 billion. Some of the companies in which the Portfolio invests may be considered micro cap companies (defined as companies with stock market capitalizations less than $500 million).Growth companies, as defined by the adviser, are those included in a third-party growth index or those that exhibit certain financial characteristics (e.g., earnings per share growth or revenue growth) determined by the adviser to indicate the company has above-average growth potential (e.g., sales, revenue, or earnings growth that may outpace peer averages or the overall market). For this purpose, a third party growth index is an index developed, calculated, and maintained by a third-party that measures the performance of growth stocks. The adviser’s investment process is derived from the observation that the quality and persistence of a company’s business is often not reflected in its current stock price. The investment team conducts fundamental research on companies elevated by the screening process. Research emphasizes the sustainability of a business’s competitive advantages and the ability to generate revenue and increase profit margins. Other important considerations include capital allocation discipline, and other qualitative factors such as strength of company management, analysis of products and competition, and financially material environmental, social, and/or governance (ESG) characteristics. Examples of ESG factors that may be considered include, but are not limited to, employee engagement, talent attraction and retention, incentive structures, and corporate strategy. Consideration of ESG factors may not be determinative in the adviser’s investment process and the adviser may conclude that other attributes of an investment outweigh ESG considerations when making investment decisions for the Portfolio. Valuation analysis is an important component of the investment process and consists of both cash flow and earnings ratios that are compared with the industry average.Portfolio construction emphasizes stock specific risk while minimizing other sources of active risk. The Portfolio is structured so that its sector weights are generally similar to those of the Russell 2000® Growth Index, an index that aligns with the Portfolio’s strategy. As a result, the Portfolio may at times have a relatively high percentage of its assets invested in a particular sector and may hold securities which are not represented in the benchmark. However, in constructing the Portfolio, the investment team monitors different sources of active risk including stock-specific risk, industry risk and style risk. The goal of this analysis is to ensure that the Portfolio remains well diversified and does not have unrewarded or unintended industry and style exposure as a consequence of individual stock selections.The Portfolio invests primarily in U.S. common stocks. The Portfolio may also invest up to 20% of net assets in American Depositary Receipts (ADRs) and other equity securities of foreign issuers which are denominated in U.S. dollars. The Portfolio may also invest in real estate investment trusts (REITs).The Portfolio may also utilize exchange-traded funds as part of its cash management strategy.The Portfolio may sell a security for a variety of reasons including when it no longer demonstrates improving quality or exhibits strong fundamental momentum, when fundamentals have changed, where the risk/reward assessment is no longer favorable, or to redeploy assets into more promising opportunities. The Portfolio may, but is not required, to exit a position if the company’s capitalization grows beyond the small cap range.
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Risk [Heading] |
rr_RiskHeading |
<span style="color:#000000;font-family:Arial;font-size:10.02pt;font-weight:bold;">PRINCIPAL RISKS</span>
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Bar Chart and Performance Table [Heading] |
rr_BarChartAndPerformanceTableHeading |
<span style="color:#000000;font-family:Arial;font-size:10.02pt;font-weight:bold;">PERFORMANCE</span>
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Performance Narrative [Text Block] |
rr_PerformanceNarrativeTextBlock |
The following bar chart illustrates the risks of investing in the Portfolio by showing how the performance of the Portfolio has varied from year to year. The table to the right of the bar chart shows the Portfolio’s average annual total return over certain time periods and compares the Portfolio’s returns with those of an index that closely aligns with the Portfolio's investment strategy (Strategy Index). The table also shows the Portfolio's returns against an index that represents the overall securities market (Broad-Based Index), which the Portfolio has added to comply with new regulatory requirements. Returns are based on past results and are not an indication of future performance. Neither the bar chart nor the table reflects the fees and expenses separately charged by the variable annuity contract or variable life insurance policy separate account that invests in the Portfolio and returns would be lower if those fees and expenses were reflected.
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Performance Information Illustrates Variability of Returns [Text] |
rr_PerformanceInformationIllustratesVariabilityOfReturns |
<span style="color:#000000;font-family:Times New Roman;font-size:10.02pt;margin-left:0%;">The following bar chart illustrates the risks of investing in the Portfolio by showing how the performance of the Portfolio has varied from year to year. The table to the right of the bar chart shows the Portfolio’s average annual total return over certain time periods and compares the Portfolio’s returns with those of an index that closely aligns with the Portfolio's investment strategy (Strategy Index). The table also shows the Portfolio's returns against an index that represents the overall securities market (Broad-Based Index), which the Portfolio has added to comply with new regulatory requirements. </span>
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Performance Additional Market Index [Text] |
rr_PerformanceAdditionalMarketIndex |
<span style="color:#000000;font-family:Times New Roman;font-size:9.02pt;">The Portfolio has added this broad-based index in response to new regulatory requirements.</span>
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Performance Past Does Not Indicate Future [Text] |
rr_PerformancePastDoesNotIndicateFuture |
<span style="color:#000000;font-family:Times New Roman;font-size:10.02pt;"> Returns are based on past results and are not an </span><span style="color:#000000;font-family:Times New Roman;font-size:10.02pt;margin-left:0%;">indication of future performance.</span>
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Bar Chart Does Not Reflect Sales Loads [Text] |
rr_BarChartDoesNotReflectSalesLoads |
<span style="color:#000000;font-family:Times New Roman;font-size:10.02pt;"> Neither the bar chart nor the table reflects the fees and expenses separately charged by the variable </span><span style="color:#000000;font-family:Times New Roman;font-size:10.02pt;margin-left:0%;">annuity contract or variable life insurance policy separate account that invests in the Portfolio and returns would be lower if those </span><span style="color:#000000;font-family:Times New Roman;font-size:10.02pt;">fees and expenses were reflected.</span>
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Bar Chart Closing [Text Block] |
rr_BarChartClosingTextBlock |
Quarter/YearReturnBest Quarter4th quarter, 202031.83%Worst Quarter1st quarter, 2020-26.17%
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Performance Table Heading |
rr_PerformanceTableHeading |
<span style="color:#000000;font-family:Times New Roman;font-size:10.02pt;font-weight:bold;">Average Annual Total Return </span> <br/><span style="color:#000000;font-family:Times New Roman;font-size:10.02pt;font-weight:bold;">(for periods ended December 31, 2024)</span>
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Small Cap Growth Stock Portfolio | Risk Lose Money [Member] |
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Risk Return Abstract |
rr_RiskReturnAbstract |
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Risk [Text Block] |
rr_RiskTextBlock |
Portfolio shares will rise and fall in value and there is a risk you could lose money by investing in the Portfolio. There can be no assurance that the Portfolio will achieve its objective.
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Small Cap Growth Stock Portfolio | Active Management Risk [Member] |
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Risk Return Abstract |
rr_RiskReturnAbstract |
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Risk [Text Block] |
rr_RiskTextBlock |
•Active Management Risk – The adviser’s investment strategies and techniques may not perform as expected which could cause the Portfolio to underperform other mutual funds or lose money. The value of securities identified using quantitative analysis can react differently to issuer, political, market and economic developments from the market as a whole or securities identified using only fundamental analysis. The factors used in quantitative analysis and the weight placed on those factors may not be predictive of a security’s value.
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Small Cap Growth Stock Portfolio | ADR Risk [Member] |
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Risk Return Abstract |
rr_RiskReturnAbstract |
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Risk [Text Block] |
rr_RiskTextBlock |
•ADR Risk – ADRs are receipts representing ownership of shares of a foreign issuer held by a U.S. bank or similar financial institution that entitle the holder to dividends and capital gains on the underlying foreign shares. ADRs are alternatives to directly purchasing the underlying foreign securities in their national markets and currencies. They are subject to many of the risks associated with direct investments in foreign securities, such as currency risk, political and economic risk and market risk, because their values depend on the performance of the non-dollar denominated underlying foreign securities. The Portfolio is also subject to fees and the credit risk of the financial institution holding the ADRs. ADRs may be “sponsored,” meaning that they are implemented by a financial institution in collaboration with the issuing foreign company, or “unsponsored,” meaning that the financial institution created the instrument without the sponsorship or direct involvement of the foreign company. Differing registration requirements apply to each type of ADR. ADRs may transact on exchanges or on over-the-counter markets (“OTC”). Conducting transactions in OTC markets may result in higher costs, a lack of pricing transparency and lower liquidity when compared with exchange-based transactions. Risks associated with different ADR types will vary, based upon differences in registration, reporting and disclosure requirements that apply to such ADRs and the characteristics of the market in which transactions for the particular ADR are conducted.
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Small Cap Growth Stock Portfolio | Equity Securities Risk [Member] |
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Risk Return Abstract |
rr_RiskReturnAbstract |
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Risk [Text Block] |
rr_RiskTextBlock |
•Equity Securities Risk – The value of equity securities, such as common stocks, could decline if the financial condition of the companies the Portfolio is invested in declines or if overall market and economic conditions deteriorate. Equity securities generally have greater price volatility than fixed income securities.
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Small Cap Growth Stock Portfolio | ESG Risk [Member] |
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Risk Return Abstract |
rr_RiskReturnAbstract |
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Risk [Text Block] |
rr_RiskTextBlock |
•ESG Risk – Incorporating the consideration of ESG factors in the investment process may result in the exclusion of certain securities for non-investment reasons and therefore the Portfolio may forego some market opportunities available to funds that do not consider ESG factors. The evaluation of ESG factors may affect the Portfolio’s exposure to certain issuers or industries and may not work as intended. The Portfolio may underperform other funds that do not consider ESG factors or that use different ESG factors to evaluate a security. Information used to evaluate ESG factors may not be readily available, complete, or accurate, and may vary across providers and issuers, as ESG factors are not uniformly defined or assessed. There is no guarantee that evaluating ESG considerations for individual securities will positively contribute to the Portfolio’s performance results.
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Small Cap Growth Stock Portfolio | Exchange Traded Funds Risk [Member] |
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Risk Return Abstract |
rr_RiskReturnAbstract |
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Risk [Text Block] |
rr_RiskTextBlock |
•Exchange Traded Funds Risk – Investing in exchange traded funds (ETFs) may expose the Portfolio to greater risk of loss and price fluctuation than investing directly in a comparable portfolio of stocks comprising the index due to lack of liquidity, the additional expense incurred as a shareholder in another investment company, and tracking error. ETFs are also subject to the risk that their market prices may trade at a premium or discount to their net asset value, which means the Portfolio will overpay for an ETF’s assets if it is trading at a premium and will get less than the value of the ETF’s assets when selling if it is trading at a discount. An active market for an ETF may not be developed or maintained. Trading of an ETF’s shares may be halted by the exchange, in which case the Portfolio would be unable to sell its ETF shares unless and until trading is resumed. To the extent that authorized participants do not place sufficient creation and redemption orders, an ETF's shares may trade at a premium or discount or may face a trading halt or delisting.
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Small Cap Growth Stock Portfolio | Foreign Investing Risk [Member] |
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Risk Return Abstract |
rr_RiskReturnAbstract |
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Risk [Text Block] |
rr_RiskTextBlock |
•Foreign Investing Risk – Investing in foreign securities may subject the Portfolio to more rapid and extreme changes in value or more losses than a fund that invests exclusively in U.S. securities. This risk is due to potentially smaller markets, differing reporting, accounting and auditing standards, and nationalization, expropriation or confiscatory taxation, currency blockage, political and economic conditions, or diplomatic developments. Foreign securities may be adversely affected by decreases in foreign currency values relative to the U.S. dollar and may be less liquid, more volatile, and harder to value than U.S. securities. The Portfolio’s investments in emerging markets heighten these risks due to a lack of established legal, political, business and social frameworks to support securities markets.
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Small Cap Growth Stock Portfolio | Investment Style Risk [Member] |
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Risk Return Abstract |
rr_RiskReturnAbstract |
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Risk [Text Block] |
rr_RiskTextBlock |
•Investment Style Risk – A portfolio managed using a growth style of investing, such as the Portfolio, may underperform when the market does not favor the particular style used by the Portfolio. Different investment styles tend to shift in and out of favor, depending on market conditions and investor sentiment.
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Small Cap Growth Stock Portfolio | Liquidity Risk [Member] |
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Risk Return Abstract |
rr_RiskReturnAbstract |
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Risk [Text Block] |
rr_RiskTextBlock |
•Liquidity Risk – Markets for small and micro cap stocks and foreign securities, in particular emerging markets securities, may be less liquid than markets for larger cap stocks and domestic securities, and therefore may be difficult to purchase or sell at an advantageous time or price, if at all. These risks may be magnified during periods of economic turmoil or in an extended economic downturn.
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Small Cap Growth Stock Portfolio | Market Risk [Member] |
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Risk Return Abstract |
rr_RiskReturnAbstract |
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Risk [Text Block] |
rr_RiskTextBlock |
•Market Risk – The risk that the market price of securities owned by the Portfolio may go up or down, sometimes rapidly or unpredictably. The value of a security may decline due to changes in general market conditions, economic trends or events that are not specifically related to the issuer of the security, or factors that affect a particular issuer or issuers, exchange, country, group of countries, region, market, industry, group of industries, sector or asset class. Global economies and financial markets are increasingly interconnected, which magnifies the potential that conditions in one country or region might adversely impact issuers in, or foreign exchange rates with, a different country or region. Geopolitical and other events, including war, terrorism, economic uncertainty, trade disputes, public health crises (such as epidemics and pandemics), and related events have led, and in the future may lead, to increased market volatility, which may disrupt U.S. and world economies and markets and may have significant adverse direct or indirect effects on the Portfolio and its investments.
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Small Cap Growth Stock Portfolio | Micro Cap Company Risk [Member] |
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Risk Return Abstract |
rr_RiskReturnAbstract |
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Risk [Text Block] |
rr_RiskTextBlock |
•Micro Cap Company Risk – Investing in micro cap stocks may cause the Portfolio to experience more rapid and extreme changes in value than a fund that invests solely in small, mid and large cap stocks due to a more limited track record, narrower product markets, more limited resources, higher risk of failure, and less liquid trading markets.
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Small Cap Growth Stock Portfolio | REITs Risk [Member] |
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Risk Return Abstract |
rr_RiskReturnAbstract |
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Risk [Text Block] |
rr_RiskTextBlock |
•REITs Risk – Investments in REITs are subject to the types of risks associated with investing in the real estate industry, including, among other risks: adverse developments affecting the real estate industry; declines in real property values; changes in interest rates; defaults by mortgagors or other borrowers and tenants; lack of availability of mortgage funds or financing; extended vacancies of properties, especially during economic downturns; casualty or condemnation losses; property taxes and operating losses; and governmental actions, such as changes to tax laws, zoning regulations or environmental regulations. REITs are dependent upon the quality of their management, may have limited financial resources and heavy cash flow dependency, may not be diversified geographically or by property type, and may be subject to self-liquidation.
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Small Cap Growth Stock Portfolio | Sector Focus Risk [Member] |
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Risk Return Abstract |
rr_RiskReturnAbstract |
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Risk [Text Block] |
rr_RiskTextBlock |
•Sector Focus Risk – To the extent the Portfolio invests a relatively high percentage of its assets in a particular sector, it will have greater exposure to the risks associated with that sector, including the risk that the securities of companies within the sector will underperform due to adverse economic conditions, regulatory or legislative changes, or increased competition affecting the sector. To the extent the Portfolio is underweight in other sectors, the Portfolio risks missing out on advances in those sectors.
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Small Cap Growth Stock Portfolio | Small Cap Company Risk [Member] |
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Risk Return Abstract |
rr_RiskReturnAbstract |
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Risk [Text Block] |
rr_RiskTextBlock |
•Small Cap Company Risk – Investing in small cap stocks may cause greater risk of loss and price fluctuation than investing in stocks of larger cap companies due to a more limited track record, narrower product markets, more limited resources and less liquid trading markets. These stocks may be more volatile and more difficult to buy and sell than stocks with larger capitalizations.
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Small Cap Growth Stock Portfolio | Underlying Portfolio Risk [Member] |
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Risk Return Abstract |
rr_RiskReturnAbstract |
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Risk [Text Block] |
rr_RiskTextBlock |
•Underlying Portfolio Risk – The Portfolio may serve as an investment option, or “Underlying Portfolio,” for other portfolios of Northwestern Mutual Series Fund, Inc. that are managed as “fund of funds.” As a result, from time to time, the Portfolio may experience relatively large investments or redemptions from those other portfolios and could be required to invest cash or sell securities at a time when it is not advantageous to do so.
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Small Cap Growth Stock Portfolio | Small Cap Growth Stock Portfolio |
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Risk Return Abstract |
rr_RiskReturnAbstract |
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Shareholder Fees(fees paid directly from your investment) |
rr_ShareholderFeeOther |
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Management Fee |
rr_ManagementFeesOverAssets |
0.53%
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Distribution and Service (12b-1) Fees |
rr_DistributionAndService12b1FeesOverAssets |
none
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Other Expenses |
rr_OtherExpensesOverAssets |
0.03%
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[1] |
Total Annual Portfolio Operating Expenses |
rr_ExpensesOverAssets |
0.56%
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[1] |
1 Year |
rr_ExpenseExampleYear01 |
$ 57
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3 Years |
rr_ExpenseExampleYear03 |
179
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5 Years |
rr_ExpenseExampleYear05 |
313
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10 Years |
rr_ExpenseExampleYear10 |
$ 701
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2015 |
rr_AnnualReturn2015 |
0.32%
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2016 |
rr_AnnualReturn2016 |
12.25%
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2017 |
rr_AnnualReturn2017 |
21.61%
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2018 |
rr_AnnualReturn2018 |
(11.71%)
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2019 |
rr_AnnualReturn2019 |
35.69%
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2020 |
rr_AnnualReturn2020 |
33.47%
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2021 |
rr_AnnualReturn2021 |
4.11%
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2022 |
rr_AnnualReturn2022 |
(28.49%)
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2023 |
rr_AnnualReturn2023 |
18.36%
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2024 |
rr_AnnualReturn2024 |
13.18%
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Highest Quarterly Return, Label |
rr_HighestQuarterlyReturnLabel |
<span style="color:#000000;font-family:Times New Roman;font-size:9.02pt;margin-left:0.0pt;">Best Quarter</span>
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Highest Quarterly Return, Date |
rr_BarChartHighestQuarterlyReturnDate |
Dec. 31, 2020
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Highest Quarterly Return |
rr_BarChartHighestQuarterlyReturn |
31.83%
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Lowest Quarterly Return, Label |
rr_LowestQuarterlyReturnLabel |
<span style="color:#000000;font-family:Times New Roman;font-size:9.02pt;margin-left:0.0pt;">Worst Quarter</span>
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Lowest Quarterly Return, Date |
rr_BarChartLowestQuarterlyReturnDate |
Mar. 31, 2020
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Lowest Quarterly Return |
rr_BarChartLowestQuarterlyReturn |
(26.17%)
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1 Yr |
rr_AverageAnnualReturnYear01 |
13.18%
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5 Yr |
rr_AverageAnnualReturnYear05 |
5.89%
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10 Yr |
rr_AverageAnnualReturnYear10 |
8.12%
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Small Cap Growth Stock Portfolio | S&P 500® Index(reflects no deduction for fees, expenses or taxes) |
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Risk Return Abstract |
rr_RiskReturnAbstract |
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1 Yr |
rr_AverageAnnualReturnYear01 |
25.02%
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[2] |
5 Yr |
rr_AverageAnnualReturnYear05 |
14.53%
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[2] |
10 Yr |
rr_AverageAnnualReturnYear10 |
13.10%
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[2] |
Small Cap Growth Stock Portfolio | Russell 2000® Growth Index(reflects no deduction for fees, expenses or taxes) |
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Risk Return Abstract |
rr_RiskReturnAbstract |
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1 Yr |
rr_AverageAnnualReturnYear01 |
15.15%
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5 Yr |
rr_AverageAnnualReturnYear05 |
6.86%
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10 Yr |
rr_AverageAnnualReturnYear10 |
8.09%
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