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Label Element Value
U.S. Socially Responsible Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading FUND SUMMARY: U.S. SOCIALLY RESPONSIBLE FUND
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The Fund seeks to obtain growth of capital through investment, primarily in equity securities, in companies which meet the social criteria established for the Fund.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. The table and the example below do not reflect the separate account fees charged in the variable annuity or variable life insurance policy (“Variable Contracts”) in which the Fund is offered. If separate account fees were shown, the Fund’s annual operating expenses would be higher. Please see your Variable Contract prospectus for more details on the separate account fees.
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination September 30, 2026
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. 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 29% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 29.00%
Expense Example [Heading] rr_ExpenseExampleHeading Expense Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
This 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 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 Fund’s operating expenses remain the same. The Example does not reflect charges imposed by the Variable Contract. If the Variable Contract fees were reflected, the expenses would be higher. See the Variable Contract prospectus for information on such charges. Although your actual costs may be higher or lower, based on these assumptions and the net expenses shown in the fee table, your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies of the Fund
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund invests, under normal circumstances, at least 80% of its net assets in the equity securities of U.S. companies meeting the Fund’s social criteria. To determine which companies meet the Fund’s social criteria, the subadviser incorporates into its investment process research services from an independent social research service, MSCI ESG Research, LLC (“MSCI ESG Research”). The Fund does not invest in the securities of companies that do not meet its social criteria. The Fund’s subadviser will generally assess whether a company continues to meet the social criteria on a monthly basis. The Fund may invest up to 20% of its net assets in the securities of other types of companies meeting the social criteria, including foreign securities, preferred stock and convertible securities. The Fund may engage in frequent and active trading of portfolio securities to achieve the Fund’s investment objective.
The principal investment technique of the Fund is to approximate the capitalization weighted total rate of return of the Standard & Poor’s 500 Composite Stock Price Index (the “S&P 500 Index”), however, the Fund shall exclude securities screened out to meet the social criteria established for the Fund.
The portfolio managers select securities from the S&P 500 Index that meet the Fund’s social criteria, and by employing a statistical technique known as “optimization.” Through this selection process, the portfolio managers seek to select a portfolio of securities that will approximate the capitalization weighted total rate of return of the S&P 500 Index while maintaining similar risk characteristics to the S&P 500 Index. The S&P 500 Index is a widely recognized, unmanaged index of common stock prices as determined by S&P Dow Jones Indices LLC, a subsidiary of S&P Global, Inc. Because the Fund limits its selections to securities that meet its social criteria, not all of the securities in the S&P 500 Index are included in its portfolio, and the Fund’s holdings may be underweight or overweight particular securities, sectors or industries within the S&P 500 Index. The subadviser may use derivatives to seek to track the performance of the S&P 500 Index, including futures and total return swaps.
The Fund’s social criteria are as follows:
The Fund does not invest in companies that have significant revenues derived from:
  •   the manufacture or distribution of civilian firearms, military weapons or weapons delivery systems;
  •   the manufacture or distribution of alcoholic beverages or tobacco products;
  •   the operation of gambling-related businesses; and
  •   the production of nuclear energy.
The Fund’s revenue criteria are established by the Fund’s subadvisor and are applied based on MSCI ESG Research revenue calculations.
The Fund also excludes companies with low environmental, social and governance controversy scores, as determined and provided by MSCI ESG Research. MSCI ESG Research uses a rules based methodology to assess issuers on key environmental, social, and governance issues (“MSCI Controversy Case Score”), including: (1) environmental issues such as climate change, natural resources, pollution and
waste, and environmental opportunities; (2) social issues such as human capital, product liability, stakeholder opposition and social opportunities; and (3) governance issues such as corporate governance and corporate behavior.
The Fund does not invest in companies that, based on low MSCI Controversy Case Scores:
  •   have a history of poor labor-management relations;
  •   engage in businesses or have products that have a severely negative impact on the environment;
  •   have significant business operations in countries whose governments pose human rights concerns; operate businesses that have a significantly adverse impact on the communities in which they are located;
  •   engage in businesses or have products that have a severely negative impact on their customers which may include companies that have products that pose safety or health concerns, engage in practices that are anti-competitive or have marketing that is inappropriate or misleading; and
  •   have a history of poor business ethics, which may include companies that have incidents of bribery or fraud, or poor governance structures.
In order to generate additional income, the Fund may lend portfolio securities to broker-dealers and other financial institutions provided that the value of the loaned securities does not exceed 30% of the Fund’s total assets. These loans earn income for the Fund and are collateralized by cash and securities issued or guaranteed by the U.S. Government or its agencies or instrumentalities.
Investors will be given at least 60 days’ written notice in advance of any change to the Fund’s 80% investment policy set forth above. Since the Fund’s definition of social criteria is not “fundamental,” VC I’s Board of Directors may change it without shareholder approval.
Risk [Heading] rr_RiskHeading Principal Risks of Investing in the Fund
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Information
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
As a result of a reorganization which occurred on May 24, 2021 (the “Reorganization”), the Fund acquired all of the assets and liabilities of the US Socially Responsible Fund (the “Predecessor Fund”), a series of VALIC Company II. The returns presented for the Fund reflect the performance of the Predecessor Fund. The Fund had not yet commenced operations prior to the Reorganization. The performance information below is based on the performance of the Predecessor Fund for periods prior to the date of the Reorganization. The Fund and the Predecessor Fund had the same investment objectives, strategies and portfolio management team on the date of the Reorganization.
The following Risk/Return Bar Chart and Table illustrate the risks of investing in the Fund by showing changes in the Fund’s performance from calendar year to calendar year and comparing the Fund’s average annual returns to those of the S&P 500® Index (a broad-based securities market index) which is relevant to the Fund because it has characteristics similar to the Fund’s investment strategies. Fees and expenses incurred at the contract level are not reflected in the bar chart or table. If these amounts were reflected, returns would be
less than those shown. Of course, past performance of the Fund is not necessarily an indication of how the Fund will perform in the future.
BlackRock Investment Management, LLC (“BlackRock”) assumed sub‑advisory responsibilities on April 28, 2025. Prior to this time, the Fund was subadvised by SunAmerica Asset Management, LLC.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following Risk/Return Bar Chart and Table illustrate the risks of investing in the Fund by showing changes in the Fund’s performance from calendar year to calendar year and comparing the Fund’s average annual returns to those of the S&P 500® Index (a broad-based securities market index) which is relevant to the Fund because it has characteristics similar to the Fund’s investment strategies.
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Of course, past performance of the Fund is not necessarily an indication of how the Fund will perform in the future.
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads Fees and expenses incurred at the contract level are not reflected in the bar chart or table. If these amounts were reflected, returns would beless than those shown.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
During the period shown in the bar chart:
Highest Quarterly Return:
      June 30, 2022           20.33 %   
Lowest Quarterly Return:
      March 31, 2020           -20.12 %   
Year to Date Most Recent Quarter:
      March 31, 2025           -2.56 %   
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns (For the periods ended December 31, 2024)
U.S. Socially Responsible Fund | Risk Lose Money [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock If the value of the assets of the Fund goes down, you could lose money.
U.S. Socially Responsible Fund | Risk Not Insured Depository Institution [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Shares of the Fund are not bank deposits and are not guaranteed or insured by any bank, government entity or the Federal Deposit Insurance Corporation.
U.S. Socially Responsible Fund | Equity Securities Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Equity Securities Risk. The Fund’s investments in equity securities are subject to the risk that stock prices will fall and may underperform other asset classes. Individual stock prices fluctuate from day‑to‑day and may decline significantly. The prices of individual stocks may be negatively affected by poor company results or other factors affecting individual prices, as well as industry and/or economic trends and developments affecting industries or the securities market as a whole.
U.S. Socially Responsible Fund | ESG Investment Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
ESG Investment Risk. The Fund’s adherence to its social criteria and application of related analyses when selecting investments may negatively impact the Fund’s performance, including relative to similar funds that use different criteria, or to funds that do not adhere to such criteria or apply such analyses. Social criteria screening limits the availability of investment opportunities for the Fund. If the Fund changes its social criteria or a company stops meeting the Fund’s social criteria, the Fund will sell the affected investments even if this means the Fund loses money. The employment of an independent social research service to assess social criteria could also negatively impact the Fund’s performance, as such service may cause different outcomes in assessing the Fund’s social criteria than if the Fund were to not use such service or were to select a different research service. Additionally, the Fund’s adherence to its social criteria and application of related analyses in connection with identifying and selecting investments may require subjective analysis and may be more difficult if data about a particular company or
market is limited. The Fund’s social criteria may be dependent upon information and data that may be incomplete, inaccurate or unavailable. The Fund may invest in companies that do not reflect the beliefs and values of any particular investor. Socially responsible norms differ by country and region, and a company’s practices or the Fund’s assessment of such may change over time.
U.S. Socially Responsible Fund | Failure to Match Index Performance Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Failure to Match Index Performance Risk. The ability of the Fund to match the performance of the S&P 500 Index may be affected by, among other things, changes in securities markets, the manner in which performance of the S&P 500 Index is calculated, changes in the composition of the S&P 500 Index, the amount and timing of cash flows into and out of the Fund, commissions, portfolio expenses, and any differences in the pricing of securities by the Fund and the S&P 500 Index. When the Fund employs an “optimization” strategy, the Fund is subject to an increased risk of tracking error, in that the securities selected in the aggregate for the Fund may perform differently than the S&P 500 Index.
U.S. Socially Responsible Fund | Foreign Investment Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Foreign Investment Risk. Investment in foreign securities involves risks due to several factors, such as illiquidity, the lack of public information, changes in the exchange rates between foreign currencies and the U.S. dollar, unfavorable political, social and legal developments, or economic and financial instability. Foreign companies are not subject to the U.S. accounting and financial reporting standards and may have riskier settlement procedures. U.S. investments that are denominated in foreign currencies or that are traded in foreign markets, or securities of U.S. companies that have significant foreign operations may be subject to foreign investment risk.
U.S. Socially Responsible Fund | Derivatives Risks [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Derivatives Risk. The prices of derivatives may move in unexpected ways due to the use of leverage and other factors and may result in increased volatility or losses. The Fund may not be able to terminate or sell derivative positions, and a liquid secondary market may not always exist for derivative positions.
U.S. Socially Responsible Fund | Futures Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Futures Risk. Futures are contracts involving the right to receive or the obligation to deliver assets or money depending on the performance of one or more underlying assets, instruments or a market or economic index. A futures contract is an exchange-traded legal contract to buy or sell a standard quantity and quality of a commodity, financial instrument, index, etc. at a specified future date and price. A futures contract is considered a derivative because it derives its value from the price of the underlying commodity, security or financial index. The prices of futures contracts can be volatile and futures contracts may lack liquidity. In addition, there may be imperfect or even negative correlation between the price of a futures contract and the price of the underlying commodity, security or financial index.
U.S. Socially Responsible Fund | Swaps Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Swaps Risk. Swap agreements are two party contracts entered into primarily by institutional investors for periods ranging from a few weeks to more than one year. In a standard “swap” transaction, two parties agree to exchange the returns (or differentials in rates of return) earned or realized on particular predetermined investments or instruments, which may be adjusted for an interest factor. The gross returns to be exchanged or “swapped” between the parties are generally calculated with respect to a “notional amount” (i.e., the return on or increase in value of a particular dollar amount invested at a particular interest rate or in a particular foreign currency), or in a “basket” of securities representing a particular index. The absence of a central exchange or market for swap transactions may lead, in some instances, to difficulties in trading and valuation, especially in the event of market disruptions.
U.S. Socially Responsible Fund | Market Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Market Risk. The Fund’s share price can fall because of weakness in the broad market, a particular industry, or specific holdings or due to adverse political or economic developments here or abroad, changes in investor psychology, or heavy institutional selling and other conditions or events (including, for example, military confrontations, war, terrorism, disease/virus, outbreaks and epidemics). The prices of individual securities may fluctuate, sometimes dramatically, from day to day. The prices of stocks and other equity securities tend to be more volatile than those of fixed-income securities.
U.S. Socially Responsible Fund | Securities Lending Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Securities Lending Risk. Engaging in securities lending could increase the market and credit risk for Fund investments. The Fund may lose money if it does not recover borrowed securities, the value of the collateral falls, or the value of investments made with cash collateral declines. The Fund’s loans will be collateralized by securities issued or guaranteed by the U.S. Government or its agencies and instrumentalities, which subjects the Fund to the credit risk of the U.S. Government or the issuing federal agency or instrumentality. If the value of either the cash collateral or the Fund’s investments of the cash collateral falls below the amount owed to a borrower, the Fund also may incur losses that exceed the amount it earned on lending the security. Securities lending also involves the risks of delay in receiving additional collateral or possible loss of rights in the collateral if the borrower fails. Another risk of securities lending is the risk that the loaned portfolio securities may not be available to the Fund on a timely basis and the Fund may therefore lose the opportunity to sell the securities at a desirable price.
U.S. Socially Responsible Fund | Convertible Securities Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Convertible Securities Risk. Convertible security values may be affected by market interest rates, issuer defaults and underlying common stock values; security values may fall if market interest rates rise and rise if market interest rates fall. Additionally, an issuer may have the right to buy back the securities at a time unfavorable to the Fund.
U.S. Socially Responsible Fund | Preferred Stock Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Preferred Stock Risk. Unlike common stock, preferred stock generally pays a fixed dividend from a company’s earnings and may have a preference over common stock on the distribution of a company’s assets in the event of bankruptcy or liquidation. Preferred stockholders’ liquidation rights are subordinate to the company’s debt holders and creditors. If interest rates rise, the fixed dividend on preferred stocks may be less attractive and the price of preferred stocks may decline. Preferred stockholders typically do not have voting rights.
U.S. Socially Responsible Fund | U.S. Socially Responsible Fund  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.11%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.36%
Fee Waivers and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets 0.02% [1]
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements rr_NetExpensesOverAssets 0.34% [1]
1 Year rr_ExpenseExampleYear01 $ 35
3 Years rr_ExpenseExampleYear03 114
5 Years rr_ExpenseExampleYear05 200
10 Years rr_ExpenseExampleYear10 454
1 Year rr_ExpenseExampleNoRedemptionYear01 35
3 Years rr_ExpenseExampleNoRedemptionYear03 114
5 Years rr_ExpenseExampleNoRedemptionYear05 200
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 454
2015 rr_AnnualReturn2015 1.11%
2016 rr_AnnualReturn2016 10.65%
2017 rr_AnnualReturn2017 20.65%
2018 rr_AnnualReturn2018 (5.20%)
2019 rr_AnnualReturn2019 31.69%
2020 rr_AnnualReturn2020 15.85%
2021 rr_AnnualReturn2021 27.09%
2022 rr_AnnualReturn2022 (17.12%)
2023 rr_AnnualReturn2023 21.70%
2024 rr_AnnualReturn2024 18.61%
Year to Date Return, Label rr_YearToDateReturnLabel Year to Date Most Recent Quarter:
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Mar. 31, 2025
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn (2.56%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Quarterly Return:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2022
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 20.33%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Quarterly Return:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (20.12%)
1 Year rr_AverageAnnualReturnYear01 18.61%
5 Years rr_AverageAnnualReturnYear05 11.99%
10 Years rr_AverageAnnualReturnYear10 11.50%
U.S. Socially Responsible Fund | S&P 500® Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 25.02%
5 Years rr_AverageAnnualReturnYear05 14.53%
10 Years rr_AverageAnnualReturnYear10 13.10%
[1] The Fund’s investment adviser, The Variable Annuity Life Insurance Company (“VALIC”), has contractually agreed to waive its advisory fee until September 30, 2026, so that the advisory fee payable by the Fund to VALIC is equal to 0.23% on the first $1 billion of the Fund’s average daily net assets and 0.22% on average daily net assets over $1 billion. This agreement may be modified or discontinued prior to such time only with the approval of the Board of Directors of VALIC Company I (“VC I”), including a majority of the directors who are not “interested persons” of VC I as defined in the Investment Company Act of 1940,Ús amended.