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Label

Element

Value

Risk/Return:

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Risk/Return [Heading]

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U.S. Government Securities

Objective [Heading]

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INVESTMENT GOAL

Objective, Primary [Text Block]

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The investment goal of the SunAmerica U.S. Government Securities Fund (the “U.S. Government Securities Fund” or the “Fund”) is high current income consistent with relative safety of capital.

Expense [Heading]

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FEES AND EXPENSES OF THE FUND

Expense Narrative [Text Block]

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This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in the SunAmerica fund complex. More information about these and other discounts is available from your financial professional and in the “Shareholder Account Information-Sales Charge Reductions and Waivers” section on page 13 of the Fund’s Prospectus and in the “Additional Information Regarding Purchase of Shares” section on page 56 of the Fund’s statement of additional information (“SAI”).

Shareholder Fees Caption [Text]

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Shareholder Fees (fees paid directly from your investment)

Operating Expenses Caption [Text]

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Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Portfolio Turnover [Heading]

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PORTFOLIO TURNOVER

Portfolio Turnover [Text Block]

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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 and may result in higher taxes when shares are held in a taxable account. 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 122% of the average value of its portfolio.

Portfolio Turnover, Rate

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Expense Breakpoint Discounts [Text]

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You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in the SunAmerica fund complex.

Expense Breakpoint, Minimum Investment Required [Amount]

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Expense Example [Heading]

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EXAMPLE:

Expense Example Narrative [Text Block]

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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 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 and the net expenses shown in the fee table, your costs would be:

Expense Example, No Redemption, By Year, Caption [Text]

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You would pay the following expenses if you did not redeem your shares:

Strategy [Heading]

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PRINCIPAL INVESTMENT STRATEGY AND TECHNIQUES OF THE FUND

Strategy Narrative [Text Block]

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The Fund’s principal investment strategy is fixed income investing. The strategy of “fixed income investing” in which the Fund engages includes utilizing economic research and analysis of current economic conditions, potential fluctuations in interest rates, and, where relevant, the strength of the underlying issuer.

The principal investment technique of the Fund is active trading of U.S. government securities without regard to the maturities of such securities. Under normal market conditions, at least 80% of the Fund’s net assets, plus any borrowing for investment purposes, will be invested in such securities.

U.S. government securities, including bills, notes, bonds and other debt securities, are issued by the U.S. Treasury or agencies and instrumentalities of the U.S. government. Certain government securities are direct obligations of the U.S. Treasury (such as Treasury Bills) and, as such, are backed by the “full faith and credit” of the U.S. government. Other types of government securities are issued by agencies or instrumentalities of the U.S. government. These types of securities may or may not be backed by the “full faith and credit” of the U.S. government. When a U.S. government security is an obligation of an agency or instrumentality and not backed by the U.S. government, the holder of such security must look principally to the agency or instrumentality issuing or guaranteeing the security for all obligations due, including repayment of principal, and not the U.S. government.

The principal investment strategy and principal investment technique of the Fund may be changed without shareholder approval. You will receive at least sixty (60) days’ notice of any change to the 80% investment policy set forth above.

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PRINCIPAL RISKS OF INVESTING IN THE FUND

Risk Narrative [Text Block]

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There can be no assurance that the Fund’s investment goal will be met or that the net return on an investment in the Fund will exceed what could have been obtained through other investment or savings vehicles. 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. As with any mutual fund, there is no guarantee that the Fund will be able to achieve its investment goals. If the value of the assets of the Fund goes down, you could lose money.

The following is a summary description of the principal risks of investing in the Fund.

Interest Rate Fluctuations. Interest rates and bond prices typically move inversely to each other. Thus, as interest rates rise, bond prices typically fall and as interest rates fall, bond prices typically rise. Longer-term and lower coupon bonds tend to be more sensitive to changes in interest rates. In addition, the market tends to discount prices of securities issued by the Government National Mortgage Association (GNMA) for prepayment risk when interest rates decline. As a result, the prices of GNMA securities typically do not rise as much as the prices of comparable bonds during periods of falling interest rates. The Fund may be subject to a greater risk of rising interest rates due to the current period of historically low rates and the effect of potential government fiscal policy initiatives and resulting market reaction to those initiatives.

Bond Market Volatility. The bond markets as a whole could go up or down (sometimes dramatically). This could affect the value of the securities in the Fund’s portfolio.

U.S. Government Securities Risk. Securities issued or guaranteed by federal agencies or authorities and U.S. government-sponsored instrumentalities or enterprises may or may not be backed by the full faith and credit of the U.S. government. For example, securities issued by the Federal Home Loan Mortgage Corporation, the Federal National Mortgage Association and the Federal Home Loan Bank are neither insured nor guaranteed by the U.S. government. These securities may be supported only by the credit of the issuing agency, authority, instrumentality or enterprise or by the ability to borrow from the U.S. Treasury and, as a result, are subject to greater credit risk than securities issued or guaranteed by the U.S. Treasury.

Prepayment Risk. The Fund may invest significantly in mortgage-backed securities, which entails the risk that the underlying principal may be “prepaid” at any time. As a general rule, prepayments increase during a period of falling interest rates and decrease during a period of rising interest rates. As a result of prepayments, the Fund may lose potential price appreciation and may be required to reinvest its assets in securities with lower interest rates. In periods of increasing interest rates, prepayments generally may decline, with the effect that the securities subject to prepayment risk held by the Fund may exhibit price characteristics of longer-term debt securities. Generally, long-term bonds are more interest-rate sensitive.

Active Trading. As part of the Fund’s principal investment technique, the Fund may engage in active trading of its portfolio securities. Because the Fund may sell a security without regard to how long it has held the security, active trading may have tax consequences for certain shareholders, involving a possible increase in short-term capital gains or losses. Active trading may result in high portfolio turnover and correspondingly greater brokerage commissions and other transaction costs, which will be borne directly by the Fund and which will affect the Fund’s performance. During periods of increased market volatility, active trading may be more pronounced.

Securities Selection. A strategy used by the Fund, or securities selected by a portfolio manager, may fail to produce the intended return.

Risk Lose Money [Text]

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If the value of the assets of the Fund goes down, you could lose money.

Risk Not Insured Depository Institution [Text]

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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.

Bar Chart and Performance Table [Heading]

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PERFORMANCE INFORMATION

Performance Narrative [Text Block]

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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 compare the Fund’s average annual returns to those of the BofA Merrill Lynch U.S. Treasury Master Index, a broad measure of market performance. Sales charges are not reflected in the Bar Chart. If these amounts were reflected, returns would be less than those shown. However, the Table includes all applicable fees and sales charges. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. Updated information on the Fund’s performance can be obtained by visiting www.safunds.com or can be obtained by phone at 800-858-8850, ext. 6003.

Performance Information Illustrates Variability of Returns [Text]

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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 compare the Fund’s average annual returns to those of the BofA Merrill Lynch U.S. Treasury Master Index, a broad measure of market performance.

Performance Availability Phone [Text]

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800-858-8850

Performance Availability Website Address [Text]

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www.safunds.com

Performance Past Does Not Indicate Future [Text]

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Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.

Bar Chart [Heading]

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U.S. GOVERNMENT SECURITIES FUND (Class A)

Bar Chart Does Not Reflect Sales Loads [Text]

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Sales charges are not reflected in the Bar Chart. If these amounts were reflected, returns would be less than those shown.

Bar Chart Closing [Text Block]

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During the 10-year period shown in the Bar Chart, the highest return for a quarter was 7.86% (quarter ended December 31, 2008) and the lowest return for a quarter was -3.22% (quarter ended June 30, 2013).

The Fund’s cumulative year-to-date return through the most recent calendar quarter ended December 31, 2014, was 5.73%.

Year to Date Return, Label

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year-to-date return

Bar Chart, Year to Date Return, Date

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Dec. 31, 2014

Bar Chart, Year to Date Return

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Highest Quarterly Return, Label

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highest return

Highest Quarterly Return, Date

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Dec. 31, 2008

Highest Quarterly Return

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Lowest Quarterly Return, Label

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lowest return

Lowest Quarterly Return, Date

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Jun. 30, 2013

Lowest Quarterly Return

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Performance Table Does Reflect Sales Loads

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However, the Table includes all applicable fees and sales charges.

Performance Table Uses Highest Federal Rate

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The after-tax returns shown were calculated using the historical highest individual federal marginal income tax rates, and do not reflect the impact of state and local taxes.

Performance Table Not Relevant to Tax Deferred

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An investor’s actual after-tax returns depend on the investor’s tax situation and may differ from those shown in the above table. The after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.

Performance Table One Class of after Tax Shown [Text]

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After-tax returns are shown only for Class A shares. After-tax returns for other classes will vary.

Performance Table Explanation after Tax Higher

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When the return after taxes on distributions and sale of Fund shares is higher than the before-tax return, it is because of realized losses. If realized losses occur upon the sale of Fund shares, the capital loss is recorded as a tax benefit, which increases the return.

Performance Table Closing [Text Block]

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The after-tax returns shown were calculated using the historical highest individual federal marginal income tax rates, and do not reflect the impact of state and local taxes. An investor’s actual after-tax returns depend on the investor’s tax situation and may differ from those shown in the above table. The after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.

After-tax returns are shown only for Class A shares. After-tax returns for other classes will vary.

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Average Annual Total Returns (as of the periods ended December 31, 2014)

BofA Merrill Lynch U.S. Treasury Master Index

Risk/Return:

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Average Annual Returns, 1 Year

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Average Annual Returns, 5 Years

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Average Annual Returns, 10 Years

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Class A

Risk/Return:

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Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

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Maximum Deferred Sales Charge (Load) (as a percentage of the lesser of the amount redeemed or original purchase cost)

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none

^[1]

Maximum Sales Charge (Load) Imposed on Reinvested Dividends

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none

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none

Management Fees

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Distribution and/or Service (12b-1) Fees

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Total Annual Fund Operating Expenses Before Fee Waivers and/or Expense Reimbursements

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Fee Waiver or Reimbursement

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Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements

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^[2],[3]

Expenses Deferred Charges [Text Block]

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Purchases of Class A shares of $1 million or more will be subject to a contingent deferred sales charge (CDSC) on redemptions made within two years of purchase.

Expense Example, with Redemption, 1 Year

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Expense Example, with Redemption, 3 Years

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Expense Example, with Redemption, 5 Years

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Expense Example, with Redemption, 10 Years

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Expense Example, No Redemption, 1 Year

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Expense Example, No Redemption, 3 Years

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Expense Example, No Redemption, 5 Years

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Expense Example, No Redemption, 10 Years

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Annual Return 2005

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Annual Return 2006

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Annual Return 2007

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Annual Return 2008

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Annual Return 2009

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Annual Return 2010

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Annual Return 2011

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Annual Return 2012

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Annual Return 2013

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Annual Return 2014

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Average Annual Returns, 1 Year

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Average Annual Returns, 5 Years

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Average Annual Returns, 10 Years

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Class A | After Taxes on Distributions

Risk/Return:

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Average Annual Returns, 1 Year

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Average Annual Returns, 5 Years

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Average Annual Returns, 10 Years

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Class A | After Taxes on Distributions and Sale of Fund Shares

Risk/Return:

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Average Annual Returns, 1 Year

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^[4]

Average Annual Returns, 5 Years

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Average Annual Returns, 10 Years

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Class C

Risk/Return:

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Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

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none

Maximum Deferred Sales Charge (Load) (as a percentage of the lesser of the amount redeemed or original purchase cost)

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^[1]

Maximum Sales Charge (Load) Imposed on Reinvested Dividends

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none

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none

Management Fees

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Distribution and/or Service (12b-1) Fees

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Total Annual Fund Operating Expenses Before Fee Waivers and/or Expense Reimbursements

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Fee Waiver or Reimbursement

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Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements

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^[2],[3]

Expenses Deferred Charges [Text Block]

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The CDSC on Class C shares applies only if shares are redeemed within twelve months of their purchase.

Expense Example, with Redemption, 1 Year

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Expense Example, with Redemption, 3 Years

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Expense Example, with Redemption, 5 Years

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Expense Example, with Redemption, 10 Years

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Expense Example, No Redemption, 1 Year

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Expense Example, No Redemption, 3 Years

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Expense Example, No Redemption, 5 Years

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Expense Example, No Redemption, 10 Years

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Average Annual Returns, 1 Year

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Average Annual Returns, 5 Years

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Average Annual Returns, 10 Years

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[1]	Purchases of Class A shares of $1 million or more will be subject to a contingent deferred sales charge (CDSC) on redemptions made within two years of purchase. The CDSC on Class C shares applies only if shares are redeemed within twelve months of their purchase. See pages 12-14 of the Prospectus for more information about the CDSCs.
[2]	Pursuant to an Expense Limitation Agreement, SunAmerica Asset Management, LLC ("SunAmerica" or the "Adviser") is contractually obligated to waive its fees and/or reimburse expenses to the extent that the Total Annual Fund Operating Expenses exceed 0.99% and 1.64%, for Class A and C shares, respectively. For purposes of the Expense Limitation Agreement, "Total Annual Fund Operating Expenses" shall not include extraordinary expenses, as determined under generally accepted accounting principles, such as litigation, or acquired fund fees and expenses, brokerage commissions and other transactional expenses relating to the purchase and sale of portfolio securities, interest, taxes and governmental fees, and other expenses not incurred in the ordinary course of the Fund's business. This agreement will continue in effect indefinitely, unless terminated by the Board of Trustees, including a majority of the Independent Trustees.
[3]	Any waivers and/or reimbursements made by SunAmerica are subject to recoupment from the Fund within two years after the occurrence of the waiver and/or reimbursement, provided that the Fund is able to effect such payment to SunAmerica and remain in compliance with the expense cap in effect at the time the waivers and/or reimbursements occurred.
[4]	When the return after taxes on distributions and sale of Fund shares is higher than the before-tax return, it is because of realized losses. If realized losses occur upon the sale of Fund shares, the capital loss is recorded as a tax benefit, which increases the return.