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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName GREAT-WEST FUNDS INC
Prospectus Date rr_ProspectusDate Apr. 29, 2020
Great-West Invesco Small Cap Value Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Fund Summary
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks long-term growth of capital.
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 and hold shares of the Fund. This table does not reflect the fees and expenses of any Permitted Account. If the fees and expenses imposed by a Permitted Account were reflected, the fees and expenses shown below would be higher.
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 April 30, 2021
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 generally indicates 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 turnover rate was 67% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 67.00%
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates Other Expenses are estimated for Class L shares because the class has not yet commenced operations.
Expense Example [Heading] rr_ExpenseExampleHeading 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 does not reflect the fees and expenses of any Permitted Account. If the fees and expenses of any Permitted Account were reflected, the fees and expenses in the Example would be higher.

The Example assumes that you invest $10,000 in the Fund for the time periods indicated and applies whether you hold or redeem all of your shares at the end of each period. The Example also assumes that the Expense Limit is in place for the first year, that your investment has a 5% return each year, that all dividends and capital gains are reinvested, and that the Fund’s operating expenses are the amount shown in the fee table and remain the same for the years shown. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock Below is a summary of the principal investment strategies of the Fund.

The following is a summary of the principal investment strategies of the Fund:

The Fund will normally invest at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in a diversified portfolio of equity securities of small capitalization companies. The principal type of equity securities purchased by the Fund is common stock. The Fund generally considers a company to be a small capitalization company if it has a market capitalization, at the time of initial purchase, of less than $5.5 billion. The Fund uses the Russell 2000® Value Index as a guide in structuring and selecting its investments, but will invest in both benchmark index and non-benchmark index securities. Over time the capitalizations of the companies will change. As they do, the size of the companies in which the Fund invests may change. If the market capitalization of a company held by the Fund exceeds $5.5 billion, the Fund may, but is not required to, sell the securities. The Fund employs a quantitative investment model and will emphasize issuers that are believed to be undervalued but demonstrate a strong potential for growth.

The Fund may invest up to 20% of its assets in foreign securities. The Fund may use futures contracts to equitize cash as a substitute for investing directly in securities. Use of derivatives by the Fund may create investment leverage.
Risk [Heading] rr_RiskHeading Principal Investment Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock Below is a summary of the principal investment risks of investing in the Fund. These risks are presented in an order that reflects GWCM’s current assessment of relative importance, but this assessment could change over time as the Fund’s portfolio changes or in light of changes in the market or the economic environment, among other things. The Fund is not required to and will not update this prospectus solely because its assessment of the relative importance of the principal risks of investing in the Fund changes.

Equity Securities Risk - The value of a company’s stock may fall as a result of factors which directly relate to that company, such as lower demand for the company’s products or services or poor management decisions. In addition, a company’s stock generally pays dividends only after the company makes required payments to holders of its bonds and other debt. For this reason, the value of the stock will usually react more strongly than bonds and other debt to actual or perceived changes in a company’s financial condition or progress.

Small Size Company Securities Risk - The stocks of small size companies often involve more risk and volatility than those of larger companies. Companies that are small or unseasoned (less than three years of operating history) are more likely not to survive or accomplish their goals with the result that the value of their stock could decline significantly. Among other things, small size companies are often dependent on a small number of products and have limited financial resources, and there is generally less publicly available information about them. Securities of small size companies have lower trading volume and are less liquid than securities of larger, more established companies.

Value Stock Risk - Value stocks tend to trade at lower price-to-book and price-to-earnings ratios which suggest that the market as a whole views their potential future earnings as limited. Investing in value stocks carries the risk that the market will not recognize a stock's potential value for a long time, or that a stock judged to be undervalued may actually be appropriately valued.

Market Risk - The value of the Fund's investments may decrease, sometimes rapidly or unexpectedly, due to factors affecting specific issuers held by the Fund, particular industries represented in the Fund's portfolio, or the overall securities markets. A variety of factors can increase the volatility of the Fund's holdings and markets generally, including political or regulatory developments, recessions, inflation, rapid interest rate changes, war or acts of terrorism, natural disasters, outbreaks of infectious illnesses or other widespread public health issues, or adverse investor sentiment generally. Certain events may cause instability across global markets, including reduced liquidity and disruptions in trading markets, while some events may affect certain geographic regions, countries, sectors, and industries more significantly than others. These adverse developments may cause broad declines in an issuer’s value due to short-term market movements or for significantly longer periods during more prolonged market downturns.

Quantitative Model Risk - The success of the investment strategy depends largely upon the effectiveness of the Sub-Adviser's quantitative model. The Sub-Adviser's ability to monitor and, if necessary, adjust its quantitative model could be adversely affected by various factors, including incorrect or outdated market and other data inputs.

Real Estate Investment Trust (“REIT”)/Real Estate Risk - Investments in real estate-related instruments may be affected by economic, legal, cultural, environmental or technological factors that affect property values, rents or occupancies of real estate. Real estate companies, including REITs or similar structures, tend to be small and mid-cap companies, which means their shares may be more volatile and less liquid. REITs and real estate-related companies may not be diversified. REITs are also subject to risks associated with changes in interest rates.

Foreign Securities Risk - Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, currency valuation or economic developments. In addition, emerging markets may be more volatile and less liquid than the markets of more mature economies, and the securities of emerging markets issuers often are subject to rapid and large changes in price.

Currency Risk - Adverse fluctuations in exchange rates between the U.S. dollar and other currencies may cause the Fund to lose money on investments denominated in foreign currencies.

Derivatives Risk - The Fund may invest in derivative instruments, including but not limited to, futures contracts. Using derivatives can disproportionately increase losses and reduce opportunities for gains when security prices, currency rates or interest rates are changing. The Fund may not fully benefit from or may lose money on derivatives if changes in their value do not correspond accurately to changes in the value of the Fund’s holdings. The other parties to certain derivative contracts present the same types of credit risk as issuers of fixed income securities. Derivatives can also make a fund less liquid and harder to value, especially in declining markets, and may increase the Fund’s volatility. There can be no assurance that the Fund’s use of derivative contracts will work as intended, and it is possible for the Fund to lose more than its original investment.

Management Risk - A strategy used by the portfolio managers may fail to produce the intended results.

An investment in the Fund is not a deposit with a bank, is not insured, endorsed or guaranteed by the FDIC or any government agency, and is subject to the possible loss of your original investment.
Risk Lose Money [Text] rr_RiskLoseMoney is subject to the possible loss of your original investment.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the Fund is not a deposit with a bank, is not insured, endorsed or guaranteed by the FDIC or any government agency,
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The bar chart and table below provide an indication of the risk of investment in the Fund by showing changes in the performance of the Fund’s Investor Class shares for the last ten calendar years and by comparing the Fund’s Institutional Class and Investor Class average annual total return to the performance of a broad-based securities market index. No Class L share performance data is provided because Class L shares have not commenced operations. Class L share performance information will appear in future versions of this Prospectus after Class L shares have annual returns for at least one complete calendar year. The returns shown below are historical and are not an indication of future performance. Total return figures assume reinvestment of dividends and capital gains distributions and include the effect of the Fund’s recurring expenses, but do not include fees and expenses of any Permitted Account. If the fees and expenses of any Permitted Account were reflected, the performance shown would be lower.

Updated performance information may be obtained at www.greatwestfunds.com (the website does not form a part of this Prospectus).
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and table below provide an indication of the risk of investment in the Fund by showing changes in the performance of the Fund’s Investor Class shares for the last ten calendar years and by comparing the Fund’s Institutional Class and Investor Class average annual total return to the performance of a broad-based securities market index.
Performance One Year or Less [Text] rr_PerformanceOneYearOrLess No Class L share performance data is provided because Class L shares have not commenced operations.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.greatwestfunds.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The returns shown below are historical and are not an indication of future performance.
Bar Chart [Heading] rr_BarChartHeading Calendar Year Total Returns
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads Total return figures assume reinvestment of dividends and capital gains distributions and include the effect of the Fund’s recurring expenses, but do not include fees and expenses of any Permitted Account. If the fees and expenses of any Permitted Account were reflected, the performance shown would be lower.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
  Quarter Ended Total Return
Best Quarter December 2010 16.57%
Worst Quarter September 2011 -21.29%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns for the Periods Ended December 31, 2019
Great-West Invesco Small Cap Value Fund | Institutional Class  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.80%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Services Fees rr_Component1OtherExpensesOverAssets none
Other Expenses rr_Component2OtherExpensesOverAssets 0.07% [1]
Total Other Expenses rr_OtherExpensesOverAssets 0.07%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.87%
Fee Waiver and Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.04% [2]
Total Annual Fund Operating Expenses After Fee Waiver and Expense Reimbursement rr_NetExpensesOverAssets 0.83%
1 Year rr_ExpenseExampleYear01 $ 85
3 Years rr_ExpenseExampleYear03 274
5 Years rr_ExpenseExampleYear05 478
10 Years rr_ExpenseExampleYear10 1,069
1 Year rr_ExpenseExampleNoRedemptionYear01 85
3 Years rr_ExpenseExampleNoRedemptionYear03 274
5 Years rr_ExpenseExampleNoRedemptionYear05 478
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,069
One Year rr_AverageAnnualReturnYear01 17.52%
Five Years rr_AverageAnnualReturnYear05
Since Inception rr_AverageAnnualReturnSinceInception 4.95% [3]
Inception Date rr_AverageAnnualReturnInceptionDate May 01, 2015
Great-West Invesco Small Cap Value Fund | Investor Class  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.80%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Services Fees rr_Component1OtherExpensesOverAssets 0.35%
Other Expenses rr_Component2OtherExpensesOverAssets 0.32% [1]
Total Other Expenses rr_OtherExpensesOverAssets 0.67%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.47%
Fee Waiver and Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.29% [2]
Total Annual Fund Operating Expenses After Fee Waiver and Expense Reimbursement rr_NetExpensesOverAssets 1.18%
1 Year rr_ExpenseExampleYear01 $ 120
3 Years rr_ExpenseExampleYear03 436
5 Years rr_ExpenseExampleYear05 775
10 Years rr_ExpenseExampleYear10 1,733
1 Year rr_ExpenseExampleNoRedemptionYear01 120
3 Years rr_ExpenseExampleNoRedemptionYear03 436
5 Years rr_ExpenseExampleNoRedemptionYear05 775
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,733
2010 rr_AnnualReturn2010 31.76%
2011 rr_AnnualReturn2011 (6.02%)
2012 rr_AnnualReturn2012 18.58%
2013 rr_AnnualReturn2013 35.65%
2014 rr_AnnualReturn2014 8.53%
2015 rr_AnnualReturn2015 (7.12%)
2016 rr_AnnualReturn2016 23.57%
2017 rr_AnnualReturn2017 6.82%
2018 rr_AnnualReturn2018 (13.86%)
2019 rr_AnnualReturn2019 17.21%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2010
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 16.57%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2011
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (21.29%)
One Year rr_AverageAnnualReturnYear01 17.21%
Five Years rr_AverageAnnualReturnYear05 4.36%
Ten Years rr_AverageAnnualReturnYear10 10.34%
Great-West Invesco Small Cap Value Fund | Class L  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.80%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Shareholder Services Fees rr_Component1OtherExpensesOverAssets 0.35%
Other Expenses rr_Component2OtherExpensesOverAssets 0.32% [1]
Total Other Expenses rr_OtherExpensesOverAssets 0.67%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.72%
Fee Waiver and Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.29% [2]
Total Annual Fund Operating Expenses After Fee Waiver and Expense Reimbursement rr_NetExpensesOverAssets 1.43%
1 Year rr_ExpenseExampleYear01 $ 146
3 Years rr_ExpenseExampleYear03 514
5 Years rr_ExpenseExampleYear05 906
10 Years rr_ExpenseExampleYear10 2,006
1 Year rr_ExpenseExampleNoRedemptionYear01 146
3 Years rr_ExpenseExampleNoRedemptionYear03 514
5 Years rr_ExpenseExampleNoRedemptionYear05 906
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,006
Great-West Invesco Small Cap Value Fund | Russell 2000® Value Index (reflects no deduction for fees, expenses or taxes) | Institutional Class  
Risk/Return: rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 22.39%
Five Years rr_AverageAnnualReturnYear05
Ten Years rr_AverageAnnualReturnYear10 7.55%
Great-West Invesco Small Cap Value Fund | Russell 2000® Value Index (reflects no deduction for fees, expenses or taxes) | Investor Class  
Risk/Return: rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 22.39%
Five Years rr_AverageAnnualReturnYear05 6.99%
Ten Years rr_AverageAnnualReturnYear10 10.56%
[1] Other Expenses are estimated for Class L shares because the class has not yet commenced operations.
[2] GWCM has contractually agreed to waive management fees or reimburse expenses if total annual fund operating expenses of any Class exceed 0.83% of the Class's average daily net assets, excluding Distribution and Service (12b-1) Fees, Shareholder Services Fees, brokerage expenses, taxes, dividend interest on short sales, interest expenses, and any extraordinary expenses, including litigation costs (the “Expense Limit”). The agreement’s current term ends on April 30, 2021 and automatically renews for one-year terms unless it is terminated by Great-West Funds or GWCM upon written notice within 90 days of the end of the current term or upon termination of the investment advisory agreement. Under the agreement, GWCM may recoup, subject to Board approval, these waivers and reimbursements in future periods, not exceeding three years following the particular waiver/reimbursement, provided Total Annual Fund Operating Expenses of the Class plus such recoupment do not exceed the lesser of the Expense Limit that was in place at the time of the waiver/reimbursement or the Expense Limit in place at the time of recoupment.
[3] Since inception on May 1, 2015