American Funds Balanced Allocation Portfolio Investment Risks - American Funds Balanced Allocation Portfolio	Dec. 31, 2025
Underlying Portfolio Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Underlying Portfolio Risk. The investment performance of a Portfolio that invests all or substantially all of its assets in Underlying Portfolios may be adversely affected if the Underlying Portfolios are unable to meet their investment objectives or the Portfolio allocates a significant portion of its assets to an Underlying Portfolio that performs poorly, including relative to other Underlying Portfolios. Any Underlying Portfolio may have multiple asset class exposures and such exposures may change over time. In addition, the Portfolio bears its pro-rata portion of the operating expenses of the Underlying Portfolios in which it invests.
Asset Allocation Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Asset Allocation Risk. The Portfolio’s ability to achieve its investment objective depends upon BIA’s analysis of various factors and the mix of asset classes that results from such analysis, which may prove incorrect. The particular asset allocation selected for the Portfolio may not perform as well as other asset allocations that could have been selected for the Portfolio. The Portfolio may experience losses or poor relative performance if BIA allocates a significant portion of the Portfolio’s assets to an asset class that does not perform as BIA anticipated, including relative to other asset classes. The Portfolio may underperform funds that allocate their assets differently than the Portfolio.
Model and Data Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Model and Data Risk. When the quantitative models (“Models”) and information and data (“Data”) used in managing the Portfolio contain an error, are input or designed incorrectly, or prove to be incorrect or incomplete, any investment decisions made in reliance on the Models and Data may not produce the desired results and the Portfolio may realize losses. Models may cause the Portfolio to underperform other investment strategies and may not perform as intended in volatile markets. In addition, any hedging based on faulty Models and Data may prove to be unsuccessful. Furthermore, the success of Models that are predictive in nature is dependent largely on the accuracy and reliability of the supplied historical data. All Models are susceptible to input errors which may cause the resulting information to be incorrect. Indirect risks of investing in the Portfolio (direct risks of investing in the Underlying Portfolios) include:
Market Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Market Risk. An Underlying Portfolio’s share price can fall because of, among other things, a decline in the market as a whole, deterioration in the prospects for a particular industry or company, changes in general economic conditions, such as prevailing interest rates or investor sentiment, or other factors including terrorism, war, natural disasters and the spread of infectious illness including epidemics or pandemics. In addition, unexpected political, regulatory, trade and diplomatic events within the United States and abroad may affect investor and consumer confidence and may adversely impact financial markets and the broader economy, perhaps suddenly and to a significant degree. Significant disruptions to the financial markets could adversely affect the liquidity and volatility of securities held by an Underlying Portfolio.
Interest Rate Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Interest Rate Risk. The value of an Underlying Portfolio’s investments in fixed income securities may decline when prevailing interest rates rise or increase when interest rates fall. The longer a security’s maturity or duration, the greater its value will change in response to changes in interest rates. The interest earned on an Underlying Portfolio’s investments in fixed income securities may decline when prevailing interest rates fall. During periods of very low or negative interest rates, an Underlying Portfolio may be unable to maintain positive returns or pay dividends to Underlying Portfolio shareholders. Additionally, under certain market conditions in which interest rates are low or negative, an Underlying Portfolio may have a very low, or even negative yield. A low or negative yield would cause an Underlying Portfolio to lose money and the net asset value of the Underlying Portfolio’s shares to decline in certain conditions and over certain time periods. Changes in prevailing interest rates, particularly sudden changes, may also increase the level of volatility in fixed income and other markets, increase redemptions in an Underlying Portfolio’s shares and reduce the liquidity of an Underlying Portfolio’s debt securities and other income-producing holdings. Changes in interest rate levels are caused by a variety of factors, such as central bank monetary policies, inflation rates, and general economic and market conditions.
Credit and Counterparty Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Credit and Counterparty Risk. The value of an Underlying Portfolio’s investments may be adversely affected if a security’s credit rating is downgraded or an issuer of an investment held by an Underlying Portfolio fails to pay an obligation on a timely basis, otherwise defaults or is perceived by other investors to be less creditworthy. If a counterparty to a derivatives or other transaction with an Underlying Portfolio files for bankruptcy, becomes insolvent, or otherwise becomes unable or unwilling to honor its obligation to an Underlying Portfolio, the Underlying Portfolio may experience significant losses or delays in realizing income on or recovering collateral and may lose all or a part of the income from the transaction.
High Yield Debt Security Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	High Yield Debt Security Risk. High yield debt securities, or “junk” bonds, may be more susceptible to market risk and credit and counterparty risk than investment grade debt securities because issuers of high yield debt securities are less secure financially and their securities are more sensitive to downturns in the economy. In addition, the secondary market for high yield debt securities may not be as liquid as that for higher rated debt securities. High-yield debt securities range from those for which the prospect for repayment of principal and interest is predominantly speculative to those which are currently in default on principal or interest payments or whose issuers are in bankruptcy.
Foreign Investment Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Foreign Investment Risk. Investments in foreign securities, whether direct or indirect, tend to be more volatile and less liquid than investments in U.S. securities because, among other things, they involve risks relating to political, social, economic and other developments abroad, as well as risks resulting from differences between the regulations and reporting standards and practices to which U.S. and foreign issuers are subject. To the extent foreign securities are denominated in foreign currencies, their values may be adversely affected by changes in currency exchange rates. All of the risks of investing in foreign securities are typically increased by investing in emerging market countries. To the extent an Underlying Portfolio invests in foreign sovereign debt securities, it is subject to additional risks.
Market Capitalization Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Market Capitalization Risk. Investing primarily in issuers in one market capitalization category (large, medium or small) carries the risk that due to current market conditions that category will be out of favor with investors. Larger, more established companies may be unable to respond quickly to new competitive challenges or attain the high growth rate of successful smaller companies. Stocks of medium and small capitalization companies may be more volatile than those of larger companies due to, among other things, narrower product lines, more limited financial resources and fewer experienced managers. In addition, there is typically less publicly available information about small capitalization companies, and their stocks may have a more limited trading market than stocks of larger companies.
Investment Style Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Investment Style Risk. Different investment styles such as growth or value tend to shift in and out of favor, depending on market and economic conditions as well as investor sentiment. An Underlying Portfolio may outperform or underperform other funds that employ a different investment style.
Mortgage Backed and Asset Backed Securities Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Mortgage-Backed and Asset-Backed Securities Risk. The value of investments in mortgage-backed and asset-backed securities is subject to interest rate risk and credit and counterparty risk. These securities are also subject to the risk that issuers will prepay the principal more quickly or more slowly than expected, which could cause an Underlying Portfolio to invest the proceeds in less attractive investments or increase the volatility of their prices. To the extent mortgage-backed and asset-backed securities held by an Underlying Portfolio are backed by lower rated securities, such as sub-prime obligations, or are subordinated to other interests in the same mortgage or asset pool, the likelihood of an Underlying Portfolio receiving payments of principal or interest may be substantially limited.
Portfolio Turnover Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Portfolio Turnover Risk. The investment techniques and strategies utilized by the Underlying Portfolios might result in a high degree of portfolio turnover. High portfolio turnover rates will increase the Underlying Portfolios’ transaction costs, which can adversely affect the returns on the Portfolio’s investments in those Underlying Portfolios.
Derivatives Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Derivatives Risk. An Underlying Portfolio may invest in derivatives to obtain investment exposure, enhance return or “hedge” or protect its assets from an unfavorable shift in the value or rate of a reference instrument or asset. Derivatives can be highly volatile and can significantly increase an Underlying Portfolio’s exposure to market risk, credit and counterparty risk and other risks. Derivatives may be illiquid and difficult to value and can involve risks in addition to, and potentially greater than, the risks of the underlying reference instrument. Because of their complex nature, some derivatives may not perform as intended. As a result, an Underlying Portfolio may not realize the anticipated benefits from a derivative it holds or it may realize losses. Certain derivatives have the potential for unlimited loss, regardless of the size of the initial investment. Derivative transactions may create investment leverage, which increases an Underlying Portfolio’s volatility and may require the Underlying Portfolio to liquidate portfolio securities when it is not advantageous to do so. Government regulation of derivative instruments may limit or prevent an Underlying Portfolio from using such instruments as part of its investment strategies, which could adversely affect the Underlying Portfolio.
Risk Lose Money [Member]
Prospectus [Line Items]
Risk [Text Block]	You could lose money by investing in the Portfolio.
Risk Not Insured Depository Institution [Member]
Prospectus [Line Items]
Risk [Text Block]	An investment in the Portfolio through a Contract is not a deposit or obligation of, or guaranteed by, any bank, and is not federally insured by the Federal Deposit Insurance Corporation, the Federal Reserve Board, or any other agency of the U.S. Government.

American Funds Balanced Allocation Portfolio Investment Risks - American Funds Balanced Allocation Portfolio

Dec. 31, 2025

Underlying Portfolio Risk. The investment performance of a Portfolio that invests all or substantially all of its assets in Underlying Portfolios may be adversely affected if the Underlying Portfolios are unable to meet their investment objectives or the Portfolio allocates a significant portion of its assets to an Underlying Portfolio that performs poorly, including relative to other Underlying Portfolios. Any Underlying Portfolio may have multiple asset class exposures and such exposures may change over time. In addition, the Portfolio bears its pro-rata portion of the operating expenses of the Underlying Portfolios in which it invests.

Prospectus [Line Items]

Risk [Text Block]

Asset Allocation Risk. The Portfolio’s ability to achieve its investment objective depends upon BIA’s analysis of various factors and the mix of asset classes that results from such analysis, which may prove incorrect. The particular asset allocation selected for the Portfolio may not perform as well as other asset allocations that could have been selected for the Portfolio. The Portfolio may experience losses or poor relative performance if BIA allocates a significant portion of the Portfolio’s assets to an asset class that does not perform as BIA anticipated, including relative to other asset classes. The Portfolio may underperform funds that allocate their assets differently than the Portfolio.

Model and Data Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Model and Data Risk. When the quantitative models (“Models”) and information and data (“Data”) used in managing the Portfolio contain an error, are input or designed incorrectly, or prove to be incorrect or incomplete, any investment decisions made in reliance on the Models and Data may not produce the desired results and the Portfolio may realize losses. Models may cause the Portfolio to underperform other investment strategies and may not perform as intended in volatile markets. In addition, any hedging based on faulty Models and Data may prove to be unsuccessful. Furthermore, the success of Models that are predictive in nature is dependent largely on the accuracy and reliability of the supplied historical data. All Models are susceptible to input errors which may cause the resulting information to be incorrect. Indirect risks of investing in the Portfolio (direct risks of investing in the Underlying Portfolios) include:

Market Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Market Risk. An Underlying Portfolio’s share price can fall because of, among other things, a decline in the market as a whole, deterioration in the prospects for a particular industry or company, changes in general economic conditions, such as prevailing interest rates or investor sentiment, or other factors including terrorism, war, natural disasters and the spread of infectious illness including epidemics or pandemics. In addition, unexpected political, regulatory, trade and diplomatic events within the United States and abroad may affect investor and consumer confidence and may adversely impact financial markets and the broader economy, perhaps suddenly and to a significant degree. Significant disruptions to the financial markets could adversely affect the liquidity and volatility of securities held by an Underlying Portfolio.

Interest Rate Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Interest Rate Risk. The value of an Underlying Portfolio’s investments in fixed income securities may decline when prevailing interest rates rise or increase when interest rates fall. The longer a security’s maturity or duration, the greater its value will change in response to changes in interest rates. The interest earned on an Underlying Portfolio’s investments in fixed income securities may decline when prevailing interest rates fall. During periods of very low or negative interest rates, an Underlying Portfolio may be unable to maintain positive returns or pay dividends to Underlying Portfolio shareholders. Additionally, under certain market conditions in which interest rates are low or negative, an Underlying Portfolio may have a very low, or even negative yield. A low or negative yield would cause an Underlying Portfolio to lose money and the net asset value of the Underlying Portfolio’s shares to decline in certain conditions and over certain time periods. Changes in prevailing interest rates, particularly sudden changes, may also increase the level of volatility in fixed income and other markets, increase redemptions in an Underlying Portfolio’s shares and reduce the liquidity of an Underlying Portfolio’s debt securities and other income-producing holdings. Changes in interest rate levels are caused by a variety of factors, such as central bank monetary policies, inflation rates, and general economic and market conditions.

Credit and Counterparty Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Credit and Counterparty Risk. The value of an Underlying Portfolio’s investments may be adversely affected if a security’s credit rating is downgraded or an issuer of an investment held by an Underlying Portfolio fails to pay an obligation on a timely basis, otherwise defaults or is perceived by other investors to be less creditworthy. If a counterparty to a derivatives or other transaction with an Underlying Portfolio files for bankruptcy, becomes insolvent, or otherwise becomes unable or unwilling to honor its obligation to an Underlying Portfolio, the Underlying Portfolio may experience significant losses or delays in realizing income on or recovering collateral and may lose all or a part of the income from the transaction.

High Yield Debt Security Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

High Yield Debt Security Risk. High yield debt securities, or “junk” bonds, may be more susceptible to market risk and credit and counterparty risk than investment grade debt securities because issuers of high yield debt securities are less secure financially and their securities are more sensitive to downturns in the economy. In addition, the secondary market for high yield debt securities may not be as liquid as that for higher rated debt securities. High-yield debt securities range from those for which the prospect for repayment of principal and interest is predominantly speculative to those which are currently in default on principal or interest payments or whose issuers are in bankruptcy.

Foreign Investment Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Foreign Investment Risk. Investments in foreign securities, whether direct or indirect, tend to be more volatile and less liquid than investments in U.S. securities because, among other things, they involve risks relating to political, social, economic and other developments abroad, as well as risks resulting from differences between the regulations and reporting standards and practices to which U.S. and foreign issuers are subject. To the extent foreign securities are denominated in foreign currencies, their values may be adversely affected by changes in currency exchange rates. All of the risks of investing in foreign securities are typically increased by investing in emerging market countries. To the extent an Underlying Portfolio invests in foreign sovereign debt securities, it is subject to additional risks.

Market Capitalization Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Market Capitalization Risk. Investing primarily in issuers in one market capitalization category (large, medium or small) carries the risk that due to current market conditions that category will be out of favor with investors. Larger, more established companies may be unable to respond quickly to new competitive challenges or attain the high growth rate of successful smaller companies. Stocks of medium and small capitalization companies may be more volatile than those of larger companies due to, among other things, narrower product lines, more limited financial resources and fewer experienced managers. In addition, there is typically less publicly available information about small capitalization companies, and their stocks may have a more limited trading market than stocks of larger companies.

Investment Style Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Investment Style Risk. Different investment styles such as growth or value tend to shift in and out of favor, depending on market and economic conditions as well as investor sentiment. An Underlying Portfolio may outperform or underperform other funds that employ a different investment style.

Mortgage Backed and Asset Backed Securities Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Mortgage-Backed and Asset-Backed Securities Risk. The value of investments in mortgage-backed and asset-backed securities is subject to interest rate risk and credit and counterparty risk. These securities are also subject to the risk that issuers will prepay the principal more quickly or more slowly than expected, which could cause an Underlying Portfolio to invest the proceeds in less attractive investments or increase the volatility of their prices. To the extent mortgage-backed and asset-backed securities held by an Underlying Portfolio are backed by lower rated securities, such as sub-prime obligations, or are subordinated to other interests in the same mortgage or asset pool, the likelihood of an Underlying Portfolio receiving payments of principal or interest may be substantially limited.

Portfolio Turnover Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Portfolio Turnover Risk. The investment techniques and strategies utilized by the Underlying Portfolios might result in a high degree of portfolio turnover. High portfolio turnover rates will increase the Underlying Portfolios’ transaction costs, which can adversely affect the returns on the Portfolio’s investments in those Underlying Portfolios.

Derivatives Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Derivatives Risk. An Underlying Portfolio may invest in derivatives to obtain investment exposure, enhance return or “hedge” or protect its assets from an unfavorable shift in the value or rate of a reference instrument or asset. Derivatives can be highly volatile and can significantly increase an Underlying Portfolio’s exposure to market risk, credit and counterparty risk and other risks. Derivatives may be illiquid and difficult to value and can involve risks in addition to, and potentially greater than, the risks of the underlying reference instrument. Because of their complex nature, some derivatives may not perform as intended. As a result, an Underlying Portfolio may not realize the anticipated benefits from a derivative it holds or it may realize losses. Certain derivatives have the potential for unlimited loss, regardless of the size of the initial investment. Derivative transactions may create investment leverage, which increases an Underlying Portfolio’s volatility and may require the Underlying Portfolio to liquidate portfolio securities when it is not advantageous to do so. Government regulation of derivative instruments may limit or prevent an Underlying Portfolio from using such instruments as part of its investment strategies, which could adversely affect the Underlying Portfolio.

Risk Lose Money [Member]

Prospectus [Line Items]

Risk [Text Block]

You could lose money by investing in the Portfolio.

Risk Not Insured Depository Institution [Member]

Prospectus [Line Items]

Risk [Text Block]

An investment in the Portfolio through a Contract is not a deposit or obligation of, or guaranteed by, any bank, and is not federally insured by the Federal Deposit Insurance Corporation, the Federal Reserve Board, or any other agency of the U.S. Government.