Investment Risks |
Oct. 31, 2025 |
|---|---|
| SelectEnergyPortfolio-AMCIZPro | Select Energy Portfolio | Risk Nondiversified Status [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | In addition, the fund is classified as non-diversified under the Investment Company Act of 1940 (1940 Act), which means that it has the ability to invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund. |
| SelectEnergyPortfolio-AMCIZPro | Select Energy Portfolio | Risk Lose Money [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | You could lose money by investing in the fund. |
| SelectEnergyPortfolio-AMCIZPro | Select Energy Portfolio | Risk Not Insured Depository Institution [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency . |
| SelectEnergyPortfolio-AMCIZPro | Select Energy Portfolio | ForeignExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. |
| SelectEnergyPortfolio-AMCIZPro | Select Energy Portfolio | IssuerSpecificChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers. |
| SelectEnergyPortfolio-AMCIZPro | Select Energy Portfolio | StockMarketVolatilityMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments. |
| SelectEnergyPortfolio-AMCIZPro | Select Energy Portfolio | EnergyIndustryConcentrationMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Energy Industry Concentration. The energy industries can be significantly affected by fluctuations in energy prices and supply and demand of energy fuels, energy conservation, the success of exploration projects, and tax and other government regulations. |
| SelectConsumerDiscretionaryPortfolio-AMCIZPro | Select Consumer Discretionary Portfolio | Risk Nondiversified Status [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | In addition, the fund is classified as non-diversified under the Investment Company Act of 1940 (1940 Act), which means that it has the ability to invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund. |
| SelectConsumerDiscretionaryPortfolio-AMCIZPro | Select Consumer Discretionary Portfolio | Risk Lose Money [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | You could lose money by investing in the fund. |
| SelectConsumerDiscretionaryPortfolio-AMCIZPro | Select Consumer Discretionary Portfolio | Risk Not Insured Depository Institution [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency . |
| SelectConsumerDiscretionaryPortfolio-AMCIZPro | Select Consumer Discretionary Portfolio | ConsumerDiscretionaryIndustryConcentrationMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Consumer Discretionary Industry Concentration. The consumer discretionary industries can be significantly affected by the performance of the overall economy, interest rates, competition, consumer confidence and spending, and changes in demographics and consumer tastes. |
| SelectConsumerDiscretionaryPortfolio-AMCIZPro | Select Consumer Discretionary Portfolio | ForeignExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Foreign Exposure. Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. |
| SelectConsumerDiscretionaryPortfolio-AMCIZPro | Select Consumer Discretionary Portfolio | IssuerSpecificChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers. |
| SelectConsumerDiscretionaryPortfolio-AMCIZPro | Select Consumer Discretionary Portfolio | StockMarketVolatilityMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments. |
| SelectTechnologyPortfolio-AMCIZPro | Select Technology Portfolio | Risk Nondiversified Status [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | In addition, the fund is classified as non-diversified under the Investment Company Act of 1940 (1940 Act), which means that it has the ability to invest a greater portion of assets in securities of a smaller number of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a more diversified fund. |
| SelectTechnologyPortfolio-AMCIZPro | Select Technology Portfolio | Risk Lose Money [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | You could lose money by investing in the fund. |
| SelectTechnologyPortfolio-AMCIZPro | Select Technology Portfolio | Risk Not Insured Depository Institution [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency . |
| SelectTechnologyPortfolio-AMCIZPro | Select Technology Portfolio | TechnologyIndustryConcentrationMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Technology Industry Concentration. The technology industries can be significantly affected by obsolescence of existing technology, short product cycles, falling prices and profits, competition from new market entrants, and general economic conditions. |
| SelectTechnologyPortfolio-AMCIZPro | Select Technology Portfolio | ForeignExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Foreign Exposure. Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. |
| SelectTechnologyPortfolio-AMCIZPro | Select Technology Portfolio | IssuerSpecificChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. The value of securities of smaller issuers can be more volatile than that of larger issuers. |
| SelectTechnologyPortfolio-AMCIZPro | Select Technology Portfolio | StockMarketVolatilityMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments. |
| Document Type | 485BPOS |