Label	Element	Value
Risk Return Abstract	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	Prudential's Gibraltar Fund, Inc.
Prospectus Date	rr_ProspectusDate	Apr. 20, 2023
Prudentials Gibraltar Fund
Risk Return Abstract	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	<span style="color:#545454;font-family:Arial;font-size:14pt;">FUND SUMMARY</span>
Objective [Heading]	rr_ObjectiveHeading	<span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;text-transform:uppercase;">Investment Objective</span>
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The investment objective of the Fund is growth of capital to an extent compatible with a concern for preservation of principal. Current income, if any, is incidental.
Expense [Heading]	rr_ExpenseHeading	<span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;text-transform:uppercase;">Fund Fees and Expenses</span>
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	The table below shows the fees and expenses that you may pay if you invest in shares of the Fund. The table does not include charges that are imposed by the investment plan contracts or the variable annuity contracts. Because contract charges are not included, the total fees and expenses that you will incur will be higher than the fees and expenses set forth in the table. See your contract for more information about contract charges.
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	<span style="font-family:Arial Narrow;font-size:7pt;font-weight:bold;margin-left:0.0pt;">Annual Fund Operating Expenses % (expenses that you pay each year as a percentage of the value of your investment)</span>
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	<span style="font-family:Arial;font-size:10pt;font-weight:bold;">Portfolio Turnover. </span>
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 Fund's most recent fiscal year, the Fund's portfolio turnover rate was 15% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	15.00%
Expense Example [Heading]	rr_ExpenseExampleHeading	<span style="font-family:Arial;font-size:10pt;font-weight:bold;">Example. </span>
Expense Example Narrative [Text Block]	rr_ExpenseExampleNarrativeTextBlock	The following example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The table does not include contract charges. Because contract charges are not included, the total fees and expenses that you will incur will be higher than the fees and expenses set forth in the example. See your contract for more information about contract charges.The example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem 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. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:
Strategy [Heading]	rr_StrategyHeading	<span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;text-transform:uppercase;">Investments, Risks and Performance</span><span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;">Principal Investment Strategies.</span>
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	The Fund invests primarily in common stock and other securities convertible into common stock. Those investments can include American Depository Receipts, which are dollar-denominated certificates representing a right to receive securities of a foreign issuer.The Fund's portfolio managers seek to invest in medium to large companies that they believe possess sustainable, above-market growth in revenues, earnings, and cash flows and reasonable valuations, resulting in a fund that exhibits growth characteristics blended with valuations comparable to that of the market.
Risk [Heading]	rr_RiskHeading	<span style="font-family:Arial;font-size:10pt;font-weight:bold;">Principal Risks of Investing in the Fund.</span>
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	The risks summarized below are the principal risks of investing in the Fund.The relative significance of the risks summarized below may change over time. All investments have risks to some degree, and it is possible that you could lose money by investing in the Fund. An investment in the Fund is not a deposit with a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. While the Fund makes every effort to achieve its objective, the Fund cannot guarantee success.The order of the risks summarized below does not indicate the significance of any particular risk factor.Economic and Market Events Risk. Events in the US and global financial markets, including actions taken by the US Federal Reserve or foreign central banks to stimulate or stabilize economic growth, may at times result in periods of unusually high volatility in a market or a segment of a market, which could negatively impact performance. Reduced liquidity in credit and fixed income markets could adversely affect issuers worldwide. In addition, it remains uncertain that governmental entities will intervene in response to market disturbances, and the effect of any such future intervention cannot be predicted.Equity Securities Risk. The value of a particular stock or equity-related security held by the Fund could fluctuate, perhaps greatly, in response to a number of factors, such as changes in the issuer’s financial condition or the value of the equity markets or a sector of those markets. Such events may result in losses to the Fund. In addition, due to decreases in liquidity, the Fund may be unable to sell its securities holdings within a reasonable time at the price it values the security or at any price.Expense Risk. The actual cost of investing in the Fund may be higher than the expenses shown in the “Annual Fund Operating Expenses” table above for a variety of reasons, including, for example, if the Fund’s average net assets decrease.Investment Style Risk. Securities held by the Fund as a result of a particular investment style, such as growth or value, tend to perform differently (i.e., better or worse than other segments of, or the overall, stock market) depending on market and economic conditions and investor sentiment. At times when the investment style is out of favor, the Fund may underperform other funds that invest in similar asset classes but use different investment styles.Liquidity and Valuation Risk. The Fund may hold one or more securities for which there are no or few buyers and sellers or the securities are subject to limitations on transfer.  The Fund may be unable to sell those portfolio holdings at the desired time or price and may have difficulty determining the value of such securities for the purpose of determining the Fund’s net asset value.  In such cases, investments owned by the Fund may be valued at fair value pursuant to policies and procedures adopted and implemented by the investment manager. No assurance can be given that the fair value prices accurately reflect the value of the security. The Fund is subject to a liquidity risk management program, which limits the ability of the Fund to invest in illiquid investments.Market and Management Risk. Markets in which the Fund invests may experience volatility and go down in value, and possibly sharply and unpredictably. Investment techniques, risk analyses, and investment strategies, which may include quantitative models or methods, used by a subadviser in making investment decisions for the Fund are subject to human error and may not produce the intended or desired results. The value of the Fund’s investments may be negatively affected by the occurrence of domestic or global events, including war, terrorism, environmental ornatural disasters or events, political or civil instability, and public health emergencies, among others. Such events may reduce consumer demand or economic output, result in market closures, travel restrictions or quarantines, and have a significant adverse impact on the economy. There is no guarantee that the investment objective of the Fund will be achieved.Regulatory Risk. The Fund is subject to a variety of laws and regulations that govern its operations. The Fund is subject to regulation by the Securities and Exchange Commission (the SEC). Similarly, the businesses and other issuers of the securities and other instruments in which the Fund invests are also subject to considerable regulation. Changes in laws and regulations may materially impact the Fund, a security, business, sector, or market.
Risk Lose Money [Text]	rr_RiskLoseMoney	<span style="font-family:Arial;font-size:10pt;"> All investments have risks to some degree, and it is possible that you could lose money by investing in the Fund.</span>
Risk Not Insured Depository Institution [Text]	rr_RiskNotInsuredDepositoryInstitution	<span style="font-family:Arial;font-size:10pt;"> An investment in the Fund is not a deposit with a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.</span>
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	<span style="font-family:Arial;font-size:10pt;font-weight:bold;">Past Performance.</span>
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	The 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 for 1, 5, and 10 years compare with those of a broad measure of market performance and a group of similar mutual funds.Past performance does not mean that the Fund will achieve similar results in the future. The Fund's returns and average annual returns shown in the chart and table are after deduction of Fund expenses and do not include contract charges. If contract charges were included, the returns shown would have been lower than those shown. See your contract for information about contract charges.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	<span style="font-family:Arial;font-size:10pt;"> The 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 for 1, 5, and 10 years compare with those of a broad measure of market performance and a group of similar mutual funds.</span>
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	<span style="font-family:Arial;font-size:10pt;">Past performance does not mean that the Fund will achieve similar results in the future.</span>
Bar Chart [Heading]	rr_BarChartHeading	Annual Total Returns
Bar Chart Does Not Reflect Sales Loads [Text]	rr_BarChartDoesNotReflectSalesLoads	<span style="font-family:Arial;font-size:10pt;"> The Fund's returns and average annual returns shown in the chart and table are after deduction of Fund expenses</span><span style="font-family:Arial;font-size:10pt;line-height:13pt;"> </span><span style="font-family:Arial;font-size:10pt;">and do not include contract charges. If contract charges were included, the returns shown would have been lower than those shown. See your contract for information about contract charges.</span>
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Best Quarter:Worst Quarter:28.63%2ndQuarter 2020-23.99%2ndQuarter 2022
Performance Table Heading	rr_PerformanceTableHeading	<span style="font-family:Arial;font-size:7.76pt;font-weight:bold;margin-left:3pt;">Average Annual Total Returns % (For the periods ended December 31, </span><span style="font-family:Arial;font-size:7.76pt;font-weight:bold;">2022)</span>
Prudentials Gibraltar Fund | PRUDENTIALS GIBRALTAR FUND
Risk Return Abstract	rr_RiskReturnAbstract
Management Fees	rr_ManagementFeesOverAssets	0.55%
Distribution (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	none
Other Expenses	rr_OtherExpensesOverAssets	0.07%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	0.62%
1 Year	rr_ExpenseExampleYear01	$ 63
3 Years	rr_ExpenseExampleYear03	199
5 Years	rr_ExpenseExampleYear05	346
10 Years	rr_ExpenseExampleYear10	774
1 Year	rr_ExpenseExampleNoRedemptionYear01	63
3 Years	rr_ExpenseExampleNoRedemptionYear03	199
5 Years	rr_ExpenseExampleNoRedemptionYear05	346
10 Years	rr_ExpenseExampleNoRedemptionYear10	$ 774
2013	rr_AnnualReturn2013	32.15%
2014	rr_AnnualReturn2014	8.43%
2015	rr_AnnualReturn2015	12.65%
2016	rr_AnnualReturn2016	0.39%
2017	rr_AnnualReturn2017	36.24%
2018	rr_AnnualReturn2018	4.61%
2019	rr_AnnualReturn2019	33.13%
2020	rr_AnnualReturn2020	42.73%
2021	rr_AnnualReturn2021	15.26%
2022	rr_AnnualReturn2022	(35.82%)
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	<span style="font-family:Arial;font-size:10pt;font-weight:bold;margin-left:0.00pt;">Best Quarter:</span>
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Jun. 30, 2020
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	28.63%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	<span style="font-family:Arial;font-size:10pt;font-weight:bold;margin-left:0.00pt;">Worst Quarter:</span>
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Jun. 30, 2022
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(23.99%)
One Year	rr_AverageAnnualReturnYear01	(35.82%)
Five Years	rr_AverageAnnualReturnYear05	8.02%
Ten Years	rr_AverageAnnualReturnYear10	12.50%
Prudentials Gibraltar Fund | S&P 500 Index (reflects no deduction for fees, expenses or taxes)
Risk Return Abstract	rr_RiskReturnAbstract
One Year	rr_AverageAnnualReturnYear01	(18.10%)
Five Years	rr_AverageAnnualReturnYear05	9.42%
Ten Years	rr_AverageAnnualReturnYear10	12.55%