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Label Element Value
Prospectus Summary | NYLI CBRE Real Estate Fund  
Risk/Return: oef_RiskReturnAbstract  
Risk/Return [Heading] oef_RiskReturnHeading NYLI CBRE Real Estate Fund
Objective [Heading] oef_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] oef_ObjectivePrimaryTextBlock

The Fund seeks total return.

Expense Heading [Optional Text] oef_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] oef_ExpenseNarrativeTextBlock

The table below describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and example below. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the Fund. In addition, different financial intermediary firms and financial professionals may impose different sales loads and waivers. More information about these and other discounts or waivers is available from your financial professional, in the "Information on Sales Charges" section starting on page 40 of the Prospectus and Appendix A – Intermediary-Specific Sales Charge Waivers and Discounts, and in the "Alternative Sales Arrangements" section on page 146 of the Statement of Additional Information.

Shareholder Fees Caption [Optional Text] oef_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Optional Text] oef_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading] oef_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] oef_PortfolioTurnoverTextBlock

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in 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 98% of the average value of its portfolio.

Portfolio Turnover, Rate oef_PortfolioTurnoverRate 98.00%
Expense Breakpoint Discounts [Text] oef_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the Fund.
Expense Breakpoint, Minimum Investment Required [Amount] oef_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Expense Example [Heading] oef_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] oef_ExpenseExampleNarrativeTextBlock The 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 the Fund for the time periods indicated whether or not you redeem all of your shares at the end of those periods (except as indicated with respect to Class C shares). The Example reflects Class C shares converting into Investor Class shares in years 9-10; expenses could be lower if you are eligible to convert to Class A shares instead. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. The Example reflects the contractual fee waiver and/or expense reimbursement arrangement, if applicable, for the current duration of the arrangement only. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example by, Year, Caption [Text] oef_ExpenseExampleByYearCaption Assuming redemption at end of period
Expense Example, No Redemption, By Year, Caption [Text] oef_ExpenseExampleNoRedemptionByYearCaption Assuming no redemption
Strategy [Heading] oef_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] oef_StrategyNarrativeTextBlock

Under normal circumstances, the Fund invests at least 80% of its assets (net assets plus borrowings for investment purposes) in common and preferred stocks of U.S. real estate investment trusts (“REITs”) and other real estate companies. The Fund’s Subadvisor, CBRE Investment Management Listed Real Assets LLC, defines a real estate company as a company that: (i) derives at least 50% of its total revenue or earnings from owning, operating, leasing, developing, managing, brokering and/or selling real estate; or (ii) has at least 50% of its assets invested in real estate. Companies principally engaged in the real estate industry may include REITs, real estate owners, real estate managers, real estate brokers, real estate dealers, and companies with substantial real estate holdings. The Fund is non-diversified, which means it may invest a greater percentage of its assets in a smaller number of issuers than a diversified fund. Under normal market conditions, the Fund will invest more than 25% of its total assets (concentrate its investments) in securities issued by companies principally engaged in the real estate industry.

The Subadvisor may invest in companies with any market capitalization. However, the Subadvisor will generally not invest in companies with a market capitalization of less than $100 million at the time of purchase. The Fund may also invest in convertible securities, initial public offerings, and Rule 144A securities.

The Fund may invest in other investment companies, including exchange-traded funds.

Investment Process: The Subadvisor focuses on investments that generally provide income and also have the potential for long-term capital appreciation. The Subadvisor uses systematic, top-down research to evaluate property market conditions and trends to judge which market sectors offer potentially attractive returns. The Subadvisor uses proprietary analytical techniques to conduct fundamental company analysis, which provides a framework for security selection. This approach incorporates several quantitative and qualitative factors that aid in evaluating performance characteristics of individual securities independently and relative to each other. The Subadvisor will also typically employ portfolio optimization tools to help in its evaluation of the Fund’s current portfolio and its identification of potential investments for the Fund. The Subadvisor's investment approach, with its emphasis on investments in companies primarily engaged in the real estate industry, is expected to produce a total return that is closely tied to the performance of the market for publicly traded real estate companies, including real estate investment trusts, which is a narrow segment of the overall U.S. stock market.

The Subadvisor includes sustainability considerations (such as environmental, social and governance factors) considerations in its analysis to help identify companies that balance the needs of all stakeholders in their communities and address sustainability issues. The sustainability factors are assessed based on internal research and information from an independent global provider of environmental, social and corporate governance research. The Subadvisor’s approach and implementation of all factors – including sustainability – is applied consistently across all investments and industries and does not change based on the size of the company or potential position size. As sustainability considerations are assessed alongside the fundamental valuation model in the Subadvisor’s analysis, the Subadvisor generally will not forgo potential investments strictly based on evaluation of sustainability factors.

The Subadvisor may sell securities for a variety of reasons, such as to secure gains, limit losses, or redeploy assets into opportunities believed to be more promising, among others.

Strategy Portfolio Concentration [Text] oef_StrategyPortfolioConcentration Under normal circumstances, the Fund invests at least 80% of its assets (net assets plus borrowings for investment purposes) in common and preferred stocks of U.S. real estate investment trusts (“REITs”) and other real estate companies. The Fund’s Subadvisor, CBRE Investment Management Listed Real Assets LLC, defines a real estate company as a company that: (i) derives at least 50% of its total revenue or earnings from owning, operating, leasing, developing, managing, brokering and/or selling real estate; or (ii) has at least 50% of its assets invested in real estate. Companies principally engaged in the real estate industry may include REITs, real estate owners, real estate managers, real estate brokers, real estate dealers, and companies with substantial real estate holdings. The Fund is non-diversified, which means it may invest a greater percentage of its assets in a smaller number of issuers than a diversified fund. Under normal market conditions, the Fund will invest more than 25% of its total assets (concentrate its investments) in securities issued by companies principally engaged in the real estate industry.The Subadvisor may invest in companies with any market capitalization. However, the Subadvisor will generally not invest in companies with a market capitalization of less than $100 million at the time of purchase. The Fund may also invest in convertible securities, initial public offerings, and Rule 144A securities.The Fund may invest in other investment companies, including exchange-traded funds.Investment Process: The Subadvisor focuses on investments that generally provide income and also have the potential for long-term capital appreciation. The Subadvisor uses systematic, top-down research to evaluate property market conditions and trends to judge which market sectors offer potentially attractive returns. The Subadvisor uses proprietary analytical techniques to conduct fundamental company analysis, which provides a framework for security selection. This approach incorporates several quantitative and qualitative factors that aid in evaluating performance characteristics of individual securities independently and relative to each other. The Subadvisor will also typically employ portfolio optimization tools to help in its evaluation of the Fund’s current portfolio and its identification of potential investments for the Fund. The Subadvisor's investment approach, with its emphasis on investments in companies primarily engaged in the real estate industry, is expected to produce a total return that is closely tied to the performance of the market for publicly traded real estate companies, including real estate investment trusts, which is a narrow segment of the overall U.S. stock market.
Bar Chart and Performance Table [Heading] oef_BarChartAndPerformanceTableHeading Past Performance
Performance Narrative [Text Block] oef_PerformanceNarrativeTextBlock

The following bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and by showing how the Fund’s average annual returns compare with those of a broad measure of market performance and three additional indexes over time. Sales loads, if any, are not reflected in the bar chart. If they were, returns would be less than those shown. The Fund has selected the Russell 3000® Index to represent a broad measure of market performance. The table also includes the average annual returns of the FTSE Nareit All Equity REITs Index, CBRE Real Estate Tiered Index and MSCI U.S. REIT Index, which are generally representative of the market sectors or types of investments in which the Fund invests. Index returns reflect no deductions for fees, expenses or taxes, except for foreign withholding taxes where applicable.

Performance data for the classes varies based on differences in their fee and expense structures. Performance data is not shown for classes with less than one calendar year of performance. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. Please visit newyorklifeinvestments.com/funds for more recent performance information.

Effective February 21, 2020, the Voya Real Estate Fund (the "Predecessor Fund") was reorganized into the Fund. As accounting successor to the Predecessor Fund, the Fund has assumed the Predecessor Fund’s historical performance. Therefore, the performance information shown below includes that of the Predecessor Fund, which was classified as a diversified fund and had a different fee structure than the Fund. Past performance may have been different if the Fund’s current non-diversified classification and fee structure had been in place during the period.

Performance Information Illustrates Variability of Returns [Text] oef_PerformanceInformationIllustratesVariabilityOfReturns The following bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and by showing how the Fund’s average annual returns compare with those of a broad measure of market performance and three additional indexes over time. Sales loads, if any, are not reflected in the bar chart. If they were, returns would be less than those shown. The Fund has selected the Russell 3000® Index to represent a broad measure of market performance. The table also includes the average annual returns of the FTSE Nareit All Equity REITs Index, CBRE Real Estate Tiered Index and MSCI U.S. REIT Index, which are generally representative of the market sectors or types of investments in which the Fund invests. Index returns reflect no deductions for fees, expenses or taxes, except for foreign withholding taxes where applicable.Performance data for the classes varies based on differences in their fee and expense structures. Performance data is not shown for classes with less than one calendar year of performance. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. Please visit newyorklifeinvestments.com/funds for more recent performance information.Effective February 21, 2020, the Voya Real Estate Fund (the "Predecessor Fund") was reorganized into the Fund. As accounting successor to the Predecessor Fund, the Fund has assumed the Predecessor Fund’s historical performance. Therefore, the performance information shown below includes that of the Predecessor Fund, which was classified as a diversified fund and had a different fee structure than the Fund.
Performance One Year or Less [Text] oef_PerformanceOneYearOrLess Performance data is not shown for classes with less than one calendar year of performance.
Performance Availability Website Address [Text] oef_PerformanceAvailabilityWebSiteAddress newyorklifeinvestments.com/funds
Performance Past Does Not Indicate Future [Text] oef_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] oef_BarChartHeading Annual Returns, Class I Shares(by calendar year 2015-2024)
Bar Chart Does Not Reflect Sales Loads [Text] oef_BarChartDoesNotReflectSalesLoads Sales loads, if any, are not reflected in the bar chart. If they were, returns would be less than those shown.
Bar Chart Footnotes [Text Block] oef_BarChartFootnotesTextBlock

As of June 30, 2025, the Class I shares of the Fund had a year-to-date return of 1.86%.

Bar Chart Closing [Text Block] oef_BarChartClosingTextBlock
   

Best Quarter

 

2023, Q4

19.95

%

Worst Quarter

 

2020, Q1

-26.86

%

Year to Date Return, Label [Optional Text] oef_YearToDateReturnLabel year-to-date return
Bar Chart, Year to Date Return, Date oef_BarChartYearToDateReturnDate Jun. 30, 2025
Bar Chart, Year to Date Return oef_BarChartYearToDateReturn 1.86%
Performance Table Heading oef_PerformanceTableHeading Average Annual Total Returns (for the periods ended December 31, 2024)
Performance Table Uses Highest Federal Rate oef_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the highest individual federal marginal income tax rates in effect at the time of each distribution or capital gain or upon the sale of Fund shares, and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred oef_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on your tax situation and may differ from those shown. After-tax returns are not relevant if you hold your shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] oef_PerformanceTableOneClassOfAfterTaxShown After-tax returns shown are for Class A shares. After-tax returns for the other share classes may vary.
Performance Table Explanation after Tax Higher oef_PerformanceTableExplanationAfterTaxHigher In some cases, the return after taxes may exceed the return before taxes due to an assumed tax benefit from any losses on a sale of shares at the end of the measurement period.
Performance Table Narrative oef_PerformanceTableNarrativeTextBlock After-tax returns are calculated using the highest individual federal marginal income tax rates in effect at the time of each distribution or capital gain or upon the sale of Fund shares, and do not reflect the impact of state and local taxes. In some cases, the return after taxes may exceed the return before taxes due to an assumed tax benefit from any losses on a sale of shares at the end of the measurement period. Actual after-tax returns depend on your tax situation and may differ from those shown. After-tax returns are not relevant if you hold your shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns shown are for Class A shares. After-tax returns for the other share classes may vary.
Prospectus Summary | NYLI CBRE Real Estate Fund | Principal Risks  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock
Principal Risks

You can lose money by investing in the Fund. An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency. The investments selected by the Subadvisor may underperform the market in which the Fund invests or other investments. The Fund may receive large purchase or redemption orders which may have adverse effects on performance if the Fund were required to sell securities, invest cash or hold a relatively large amount of cash at times when it would not otherwise do so.

The principal risks of investing in the Fund are summarized below. The relative significance of each principal risk summarized below may change over time.

Prospectus Summary | NYLI CBRE Real Estate Fund | Risk Lose Money [Member]  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock You can lose money by investing in the Fund.
Prospectus Summary | NYLI CBRE Real Estate Fund | Risk Not Insured Depository Institution [Member]  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency.
Prospectus Summary | NYLI CBRE Real Estate Fund | Market Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

Market Risk: Changes in markets may cause the value of investments to fluctuate, which could cause the Fund to underperform other funds with similar investment objectives and strategies. Such changes may be rapid and unpredictable. From time to time, markets may experience periods of stress as a result of various market, economic and geopolitical factors (including responses to government actions or interventions) for potentially prolonged periods that may result in: (i) increased market volatility; (ii) reduced market liquidity; and (iii) increased redemptions of shares. Certain securities may be difficult to value under such conditions, and such conditions may add significantly to the risk of volatility in the net asset value of the Fund's shares and adversely affect the Fund and its investments.

Prospectus Summary | NYLI CBRE Real Estate Fund | Portfolio Management Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

Portfolio Management Risk: The investment strategies, practices and risk analyses used by the Subadvisor may not produce the desired results or expected returns.The Subadvisor may give consideration to certain sustainability (such as environmental, social and governance factors) criteria when evaluating an investment opportunity. The application of sustainability criteria may result in the Fund (i) having exposure to certain securities or industry sectors that are different than the composition of the Fund's benchmark; and (ii) performing differently than other funds and strategies in its peer group that do not take into account sustainability criteria or the Fund's benchmark. Investments selected using quantitative methods or based on models that analyze information and data ("quantitative tools") may perform differently from the market as a whole. The quantitative tool used by the Subadvisor, and the investments selected based on the quantitative tool, may not perform as expected. The quantitative tool may contain certain assumptions in construction and implementation that may adversely affect the Fund’s performance. There may also be technical

issues with the construction and implementation of quantitative tools (for example, software or other technology malfunctions, or programming inaccuracies). In addition, the Fund’s performance will reflect, in part, the Subadvisor’s ability to make active qualitative decisions and timely adjust the quantitative tool, including the tool’s underlying metrics and data.

Prospectus Summary | NYLI CBRE Real Estate Fund | Real Estate Investment Trust Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

Real Estate Investment Trust Risk: Investments in REITs involve risks associated with direct ownership of real estate, including decline in property values, extended vacancies, increases in property taxes and changes in interest rates. Additionally, the appreciation of securities issued by a REIT depends, in part, on the skills of the REIT’s manager. REITs may not be diversified, may experience substantial cost in the event of borrower or lessee defaults and are subject to heavy cash flow dependency.

Prospectus Summary | NYLI CBRE Real Estate Fund | Real Estate Companies Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

Real Estate Companies Risk: The Fund’s investments in the real estate sector have many of the same risks as direct ownership of real estate, including the risk that the value of real estate could decline due to a variety of factors that affect the real estate market generally. These risks include, among others, declines in the value of real estate, changes in local and general economic conditions, such as the possible decline in the income generated by the real estate, fluctuations in occupancy levels and the demand for properties or real estate-related services, changes in the availability or terms of mortgages and other financing that may render the sale or refinancing of properties difficult or unattractive, supply and demand, interest rates, changes in zoning laws, overbuilding, extended vacancies of properties, regulatory limitations on rents, losses due to environmental liabilities, property taxes and operating expenses. The Fund’s investments in real estate companies are particularly sensitive to economic downturns.

Prospectus Summary | NYLI CBRE Real Estate Fund | Equity Securities Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

Equity Securities Risk: Investments in common stocks and other equity securities are particularly subject to the risk of changing economic, stock market, industry and company conditions and the risks inherent in the ability to anticipate such changes that can adversely affect the value of portfolio holdings.

Prospectus Summary | NYLI CBRE Real Estate Fund | Preferred Stock Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

Preferred Stock Risk: Preferred stock is subject to many of the risks associated with debt securities, including interest rate risk. In addition, preferred stocks may not pay dividends, an issuer may suspend payment of dividends on preferred stock at any time, and in certain situations an issuer may call or redeem its preferred stock or convert it to common stock. To the extent that the Fund invests a substantial portion of its assets in convertible preferred stocks, declining common stock values may also cause the value of the Fund’s investments to decline.

Prospectus Summary | NYLI CBRE Real Estate Fund | Convertible Securities Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

Convertible Securities Risk: Convertible securities are typically subordinate to an issuer’s other debt obligations. In part, the total return for a convertible security depends upon the performance of the underlying stock into which it can be converted. Also, issuers of convertible securities are often not as strong financially as those issuing securities with higher credit ratings, are more likely to encounter financial difficulties and typically are more vulnerable to changes in the economy, such as a recession or a sustained period of rising interest rates, which could affect their ability to make interest and principal payments. Certain types of convertible securities may decline in value or lose their value entirely in the event that the issuer's financial condition becomes significantly impaired. If an issuer stops making interest and/or principal payments, the Fund could lose its entire investment.

Prospectus Summary | NYLI CBRE Real Estate Fund | Initial Public Offering Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

Initial Public Offering Risk: Initial public offering share prices are frequently volatile due to factors such as the absence of a prior public market, unseasoned trading, the small number of shares available for trading and limited information about the issuer. Investments in initial public offering shares may significantly impact Fund performance.

Prospectus Summary | NYLI CBRE Real Estate Fund | Investments in Other Investment Companies Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

Investments in Other Investment Companies Risk: The Fund's investment in another investment company may subject the Fund indirectly to the risks of that investment company. The Fund also will bear its share of the underlying investment company's fees and expenses, which are in addition to the Fund's own fees and expenses.

Prospectus Summary | NYLI CBRE Real Estate Fund | Private Placement and Restricted Securities Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

Private Placement and Restricted Securities Risk: The Fund may invest in privately issued securities, including those which may be resold only in accordance with Rule 144A under the Securities Act of 1933, as amended. Securities acquired in a private placement generally are subject to strict restrictions on resale, and there may be no market or a limited market for the resale of such securities. Therefore, the Fund may be unable to dispose of such securities when it desires to do so or at the most favorable price. This potential lack of liquidity also may make it more difficult to accurately value these securities.

Prospectus Summary | NYLI CBRE Real Estate Fund | Market Capitalization Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

Market Capitalization Risk: Investments in securities issued by small-, mid-, or large-cap companies will be subject to the risks associated with securities issued by companies of the applicable market capitalization.  Securities of small-cap and mid-cap companies may be subject to greater price volatility, significantly lower trading volumes, cyclical, static or moderate growth prospects and greater spreads between their bid and ask prices than securities of larger companies. Smaller capitalization companies frequently rely on narrower product lines and niche markets and may be more vulnerable to adverse business or market developments.  Securities issued by larger companies may have less growth potential and may not be able to attain the high growth rates of successful smaller companies, especially during strong economic periods.  In addition, larger companies may be less capable of responding quickly to competitive challenges and industry changes, including those resulting from improvements in technology, and may suffer sharper price declines as a result of earnings disappointments.  There is a risk that the securities issued by companies of a certain market capitalization may underperform the broader market at any given time.

Prospectus Summary | NYLI CBRE Real Estate Fund | Liquidity and Valuation Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

Liquidity and Valuation Risk: The Fund’s investments may be illiquid at the time of purchase or liquid at the time of purchase and subsequently become illiquid due to, among other things, events relating to the issuer of the securities, market events, operational issues, economic conditions, investor perceptions or lack of market participants. The lack of an active trading market may make it difficult to sell or obtain an accurate price for a security. If market conditions or issuer specific developments make it difficult to value securities, the Fund may value these securities using more

subjective methods, such as fair value pricing. In such cases, the value determined for a security could be different than the value realized upon such security's sale. As a result, an investor could pay more than the market value when buying shares or receive less than the market value when selling shares. This could affect the proceeds of any redemption or the number of shares an investor receives upon purchase. The Fund is subject to the risk that it could not meet redemption requests within the allowable time period without significant dilution of remaining investors' interests in the Fund. To meet redemption requests or to raise cash to pursue other investment opportunities, the Fund may be forced to sell securities at an unfavorable time and/or under unfavorable conditions, which may adversely affect the Fund’s performance. These risks are heightened for fixed income instruments in a changing interest rate environment.

Prospectus Summary | NYLI CBRE Real Estate Fund | Exchange-Traded Fund ("ETF") Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

Exchange-Traded Fund ("ETF") Risk: The risks of owning an ETF generally reflect the risks of owning the underlying securities in which the ETF invests or is designed to track, although lack of liquidity in an ETF’s shares could result in the market price of the ETF’s shares being more volatile than its underlying portfolio securities. Disruptions in the markets for the securities underlying ETFs could result in losses on the investments in ETFs. ETFs also have management fees and transaction costs that may make them more expensive than owning the underlying securities directly.

Prospectus Summary | NYLI CBRE Real Estate Fund | Concentration Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

Concentration Risk: Because the Fund concentrates its investments in securities issued by companies principally engaged in the real estate industry, the Fund may be subject to greater risks and market fluctuations than a fund whose portfolio has exposure to a broader range of industries. The Fund is particularly susceptible to financial, economic, political, or market events, as well as government regulation, impacting the real estate industry, such as declines in the value of real estate, supply of and demand for real estate, construction and development costs, interest rates, general economic downturns and factors that affect the real estate market generally. The Fund is subject to the risk that: (i) its performance will be closely tied to the performance of the real estate industry; (ii) its performance will be adversely impacted when the real estate industry experiences a downturn; and (iii) it will perform poorly during a slump in demand for securities of companies principally engaged in the real estate industry.

Prospectus Summary | NYLI CBRE Real Estate Fund | Growth Stock Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

Growth Stock Risk: If growth companies do not increase their earnings at a rate expected by investors, the market price of the stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can cushion stock prices in market downturns. These risks may be more pronounced in companies that are in the earlier stages of their growth cycle.

Prospectus Summary | NYLI CBRE Real Estate Fund | Non-Diversification Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

Non-Diversification Risk: The Fund is a non-diversified, open-end management investment company under the Investment Company Act of 1940, as amended. A non-diversified fund may have a significant portion of its investments in a smaller number of issuers than a diversified fund. Having a larger percentage of assets in a smaller number of issuers makes a non-diversified fund, like the Fund, more susceptible to the risk that one single event or occurrence can have a significant adverse impact upon the Fund.

Prospectus Summary | NYLI CBRE Real Estate Fund | Russell 3000® Index1  
Risk/Return: oef_RiskReturnAbstract  
Average Annual Return, Label [Optional Text] oef_AverageAnnualReturnLabel Russell 3000® Index1 [1]
Average Annual Return, Percent oef_AvgAnnlRtrPct 23.81%
Average Annual Return, Percent oef_AvgAnnlRtrPct 13.86%
Average Annual Return, Percent oef_AvgAnnlRtrPct 12.55%
Prospectus Summary | NYLI CBRE Real Estate Fund | FTSE Nareit All Equity REITs Index2  
Risk/Return: oef_RiskReturnAbstract  
Average Annual Return, Label [Optional Text] oef_AverageAnnualReturnLabel FTSE Nareit All Equity REITs Index2 [2]
Average Annual Return, Percent oef_AvgAnnlRtrPct 4.92%
Average Annual Return, Percent oef_AvgAnnlRtrPct 3.29%
Average Annual Return, Percent oef_AvgAnnlRtrPct 5.83%
Prospectus Summary | NYLI CBRE Real Estate Fund | CBRE Real Estate Tiered Index3  
Risk/Return: oef_RiskReturnAbstract  
Average Annual Return, Label [Optional Text] oef_AverageAnnualReturnLabel CBRE Real Estate Tiered Index3 [3]
Average Annual Return, Percent oef_AvgAnnlRtrPct 4.92%
Average Annual Return, Percent oef_AvgAnnlRtrPct 2.75%
Average Annual Return, Percent oef_AvgAnnlRtrPct 4.87%
Prospectus Summary | NYLI CBRE Real Estate Fund | MSCI U.S. REIT® Index4  
Risk/Return: oef_RiskReturnAbstract  
Average Annual Return, Label [Optional Text] oef_AverageAnnualReturnLabel MSCI U.S. REIT® Index4 [4]
Average Annual Return, Percent oef_AvgAnnlRtrPct 8.75%
Average Annual Return, Percent oef_AvgAnnlRtrPct 4.31%
Average Annual Return, Percent oef_AvgAnnlRtrPct 5.66%
Prospectus Summary | NYLI CBRE Real Estate Fund | Class A  
Risk/Return: oef_RiskReturnAbstract  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) oef_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.50%
Maximum Deferred Sales Charge (as a percentage) oef_MaximumDeferredSalesChargeOverOther 0.00% [5]
Management Fees (as a percentage of Assets) oef_ManagementFeesOverAssets 0.75%
Distribution and Service (12b-1) Fees oef_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): oef_OtherExpensesOverAssets 0.39%
Expenses (as a percentage of Assets) oef_ExpensesOverAssets 1.39%
Fee Waiver or Reimbursement oef_FeeWaiverOrReimbursementOverAssets (0.21%) [6]
Net Expenses (as a percentage of Assets) oef_NetExpensesOverAssets 1.18% [6]
Fee Waiver or Reimbursement over Assets, Date of Termination oef_FeeWaiverOrReimbursementOverAssetsDateOfTermination August 31, 2026
Expenses Deferred Charges [Text Block] oef_ExpensesDeferredChargesTextBlock No initial sales charge applies on investments of $1 million or more (and certain other qualified purchases referenced within “Information on Sales Charges” in the Shareholder Guide). However, a contingent deferred sales charge of 1.00% may be imposed on certain redemptions made within 18 months of the date of purchase on shares that were purchased without an initial sales charge. For more information on contingent deferred sales charges, see “Sales Charges” in the Shareholder Guide.
Expense Example, with Redemption, 1 Year oef_ExpenseExampleYear01 $ 664
Expense Example, with Redemption, 3 Years oef_ExpenseExampleYear03 946
Expense Example, with Redemption, 5 Years oef_ExpenseExampleYear05 1,250
Expense Example, with Redemption, 10 Years oef_ExpenseExampleYear10 $ 2,110
Average Annual Return, Percent oef_AvgAnnlRtrPct (4.06%)
Average Annual Return, Percent oef_AvgAnnlRtrPct 1.97%
Average Annual Return, Percent oef_AvgAnnlRtrPct 3.73%
Performance Inception Date oef_PerfInceptionDate Dec. 20, 2002
Prospectus Summary | NYLI CBRE Real Estate Fund | Investor Class  
Risk/Return: oef_RiskReturnAbstract  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) oef_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.00%
Maximum Deferred Sales Charge (as a percentage) oef_MaximumDeferredSalesChargeOverOther 0.00% [5]
Management Fees (as a percentage of Assets) oef_ManagementFeesOverAssets 0.75%
Distribution and Service (12b-1) Fees oef_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): oef_OtherExpensesOverAssets 0.33%
Expenses (as a percentage of Assets) oef_ExpensesOverAssets 1.33%
Fee Waiver or Reimbursement oef_FeeWaiverOrReimbursementOverAssets 0.00% [6]
Net Expenses (as a percentage of Assets) oef_NetExpensesOverAssets 1.33% [6]
Fee Waiver or Reimbursement over Assets, Date of Termination oef_FeeWaiverOrReimbursementOverAssetsDateOfTermination August 31, 2026
Expenses Deferred Charges [Text Block] oef_ExpensesDeferredChargesTextBlock No initial sales charge applies on investments of $1 million or more (and certain other qualified purchases referenced within “Information on Sales Charges” in the Shareholder Guide). However, a contingent deferred sales charge of 1.00% may be imposed on certain redemptions made within 18 months of the date of purchase on shares that were purchased without an initial sales charge. For more information on contingent deferred sales charges, see “Sales Charges” in the Shareholder Guide.
Expense Example, with Redemption, 1 Year oef_ExpenseExampleYear01 $ 629
Expense Example, with Redemption, 3 Years oef_ExpenseExampleYear03 900
Expense Example, with Redemption, 5 Years oef_ExpenseExampleYear05 1,192
Expense Example, with Redemption, 10 Years oef_ExpenseExampleYear10 $ 2,021
Average Annual Return, Percent oef_AvgAnnlRtrPct (3.65%)
Average Annual Return, Percent oef_AvgAnnlRtrPct 0.71%
Performance Inception Date oef_PerfInceptionDate Feb. 24, 2020
Prospectus Summary | NYLI CBRE Real Estate Fund | Class C  
Risk/Return: oef_RiskReturnAbstract  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) oef_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 0.00%
Maximum Deferred Sales Charge (as a percentage) oef_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) oef_ManagementFeesOverAssets 0.75%
Distribution and Service (12b-1) Fees oef_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses (as a percentage of Assets): oef_OtherExpensesOverAssets 0.33%
Expenses (as a percentage of Assets) oef_ExpensesOverAssets 2.08%
Fee Waiver or Reimbursement oef_FeeWaiverOrReimbursementOverAssets (0.15%) [6]
Net Expenses (as a percentage of Assets) oef_NetExpensesOverAssets 1.93% [6]
Fee Waiver or Reimbursement over Assets, Date of Termination oef_FeeWaiverOrReimbursementOverAssetsDateOfTermination August 31, 2026
Expense Example, with Redemption, 1 Year oef_ExpenseExampleYear01 $ 296
Expense Example, with Redemption, 3 Years oef_ExpenseExampleYear03 637
Expense Example, with Redemption, 5 Years oef_ExpenseExampleYear05 1,105
Expense Example, with Redemption, 10 Years oef_ExpenseExampleYear10 2,206
Expense Example, No Redemption, 1 Year oef_ExpenseExampleNoRedemptionYear01 196
Expense Example, No Redemption, 3 Years oef_ExpenseExampleNoRedemptionYear03 637
Expense Example, No Redemption, 5 Years oef_ExpenseExampleNoRedemptionYear05 1,105
Expense Example, No Redemption, 10 Years oef_ExpenseExampleNoRedemptionYear10 $ 2,206
Average Annual Return, Percent oef_AvgAnnlRtrPct (0.26%)
Average Annual Return, Percent oef_AvgAnnlRtrPct 2.42%
Average Annual Return, Percent oef_AvgAnnlRtrPct 3.58%
Performance Inception Date oef_PerfInceptionDate Jan. 17, 2003
Prospectus Summary | NYLI CBRE Real Estate Fund | Class I  
Risk/Return: oef_RiskReturnAbstract  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) oef_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 0.00%
Maximum Deferred Sales Charge (as a percentage) oef_MaximumDeferredSalesChargeOverOther 0.00%
Management Fees (as a percentage of Assets) oef_ManagementFeesOverAssets 0.75%
Distribution and Service (12b-1) Fees oef_DistributionAndService12b1FeesOverAssets 0.00%
Other Expenses (as a percentage of Assets): oef_OtherExpensesOverAssets 0.39%
Expenses (as a percentage of Assets) oef_ExpensesOverAssets 1.14%
Fee Waiver or Reimbursement oef_FeeWaiverOrReimbursementOverAssets (0.31%) [6]
Net Expenses (as a percentage of Assets) oef_NetExpensesOverAssets 0.83% [6]
Fee Waiver or Reimbursement over Assets, Date of Termination oef_FeeWaiverOrReimbursementOverAssetsDateOfTermination August 31, 2026
Expense Example, with Redemption, 1 Year oef_ExpenseExampleYear01 $ 85
Expense Example, with Redemption, 3 Years oef_ExpenseExampleYear03 331
Expense Example, with Redemption, 5 Years oef_ExpenseExampleYear05 598
Expense Example, with Redemption, 10 Years oef_ExpenseExampleYear10 $ 1,358
Highest Quarterly Return, Label [Optional Text] oef_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date oef_BarChartHighestQuarterlyReturnDate Dec. 31, 2023
Highest Quarterly Return oef_BarChartHighestQuarterlyReturn 19.95%
Lowest Quarterly Return, Label [Optional Text] oef_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date oef_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return oef_BarChartLowestQuarterlyReturn (26.86%)
Average Annual Return, Percent oef_AvgAnnlRtrPct 1.86%
Average Annual Return, Percent oef_AvgAnnlRtrPct 3.55%
Average Annual Return, Percent oef_AvgAnnlRtrPct 4.73%
Annual Return [Percent] oef_AnnlRtrPct 3.11%
Annual Return [Percent] oef_AnnlRtrPct 4.26%
Annual Return [Percent] oef_AnnlRtrPct 5.12%
Annual Return [Percent] oef_AnnlRtrPct (7.94%)
Annual Return [Percent] oef_AnnlRtrPct 28.19%
Annual Return [Percent] oef_AnnlRtrPct (6.49%)
Annual Return [Percent] oef_AnnlRtrPct 52.63%
Annual Return [Percent] oef_AnnlRtrPct (27.02%)
Annual Return [Percent] oef_AnnlRtrPct 12.19%
Annual Return [Percent] oef_AnnlRtrPct 1.86%
Performance Inception Date oef_PerfInceptionDate Dec. 31, 1996
Prospectus Summary | NYLI CBRE Real Estate Fund | Class I | After Taxes on Distributions  
Risk/Return: oef_RiskReturnAbstract  
Average Annual Return, Percent oef_AvgAnnlRtrPct 1.26%
Average Annual Return, Percent oef_AvgAnnlRtrPct 1.29%
Average Annual Return, Percent oef_AvgAnnlRtrPct 1.66%
Prospectus Summary | NYLI CBRE Real Estate Fund | Class I | After Taxes on Distributions and Sales  
Risk/Return: oef_RiskReturnAbstract  
Average Annual Return, Percent oef_AvgAnnlRtrPct 1.12%
Average Annual Return, Percent oef_AvgAnnlRtrPct 2.11%
Average Annual Return, Percent oef_AvgAnnlRtrPct 2.92%
Prospectus Summary | NYLI CBRE Real Estate Fund | Class R6  
Risk/Return: oef_RiskReturnAbstract  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) oef_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 0.00%
Maximum Deferred Sales Charge (as a percentage) oef_MaximumDeferredSalesChargeOverOther 0.00%
Management Fees (as a percentage of Assets) oef_ManagementFeesOverAssets 0.75%
Distribution and Service (12b-1) Fees oef_DistributionAndService12b1FeesOverAssets 0.00%
Other Expenses (as a percentage of Assets): oef_OtherExpensesOverAssets 0.10%
Expenses (as a percentage of Assets) oef_ExpensesOverAssets 0.85%
Fee Waiver or Reimbursement oef_FeeWaiverOrReimbursementOverAssets (0.11%) [6]
Net Expenses (as a percentage of Assets) oef_NetExpensesOverAssets 0.74% [6]
Fee Waiver or Reimbursement over Assets, Date of Termination oef_FeeWaiverOrReimbursementOverAssetsDateOfTermination August 31, 2026
Expense Example, with Redemption, 1 Year oef_ExpenseExampleYear01 $ 76
Expense Example, with Redemption, 3 Years oef_ExpenseExampleYear03 260
Expense Example, with Redemption, 5 Years oef_ExpenseExampleYear05 461
Expense Example, with Redemption, 10 Years oef_ExpenseExampleYear10 $ 1,039
Average Annual Return, Percent oef_AvgAnnlRtrPct 1.95%
Average Annual Return, Percent oef_AvgAnnlRtrPct 3.63%
Average Annual Return, Percent oef_AvgAnnlRtrPct 4.81%
Performance Inception Date oef_PerfInceptionDate Jul. 03, 2014
[1] The Russell 3000® Index measures the performance of the largest 3,000 U.S. companies representing approximately 98% of the investable U.S. equity market.
[2] The FTSE Nareit All Equity REITs Index is a free-float adjusted, market capitalization-weighted index of U.S. equity REITs. Constituents of the index include all tax-qualified REITs with more than 50 percent of total assets in qualifying real estate assets other than mortgages secured by real property.
[3] The returns for the CBRE Real Estate Tiered Index represent the returns of the MSCI U.S. REIT® Index prior to January 1, 2021 and the returns of the FTSE Nareit All Equity REITs Index thereafter.
[4] The MSCI U.S. REIT® Index is a free float-adjusted market capitalization weighted index that is comprised of equity REITs. The MSCI U.S. REIT® Index is based on the MSCI USA Investable Market Index, its parent index, which captures the large, mid and small cap segments of the U.S. market.
[5] No initial sales charge applies on investments of $1 million or more (and certain other qualified purchases referenced within “Information on Sales Charges” in the Shareholder Guide). However, a contingent deferred sales charge of 1.00% may be imposed on certain redemptions made within 18 months of the date of purchase on shares that were purchased without an initial sales charge. For more information on contingent deferred sales charges, see “Sales Charges” in the Shareholder Guide.
[6] New York Life Investment Management LLC ("New York Life Investments") has contractually agreed to waive fees and/or reimburse expenses so that Total Annual Fund Operating Expenses (excluding taxes, interest, litigation, extraordinary expenses, brokerage and other transaction expenses relating to the purchase or sale of portfolio investments, and acquired (underlying) fund fees and expenses) do not exceed the following percentages of its average daily net assets: Class A, 1.18%; Investor Class 1.35%; Class C, 1.93%; Class I, 0.83%; and Class R6, 0.74%. This agreement will remain in effect until August 31, 2026, and thereafter shall renew automatically for one-year terms unless New York Life Investments provides written notice of termination prior to the start of the next term or, at any time, upon approval of the Board of Trustees of the Fund.