485BPOS

Filed Pursuant to Rule 485(b)

As filed with the Securities and Exchange Commission on January 7, 2013

Registration No. 33-19229; 811-5430

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM N-1A

REGISTRATION STATEMENT
UNDER
THE SECURITIES ACT OF 1933	x
Pre-Effective Amendment No.	¨
Post-Effective Amendment No. 116	x
REGISTRATION STATEMENT
UNDER
THE INVESTMENT COMPANY ACT OF 1940	x
Amendment No. 114	x

(Check appropriate box or boxes)

SSgA FUNDS

(Exact Name of Registrant as Specified in Charter)

One Lincoln Street

Boston, Massachusetts 02111-2900

(Address of Principal Executive Offices)

Registrant’s telephone number, including area code: (617) 664-2426

Name and Address of Agent for Service:	Copies to:
Joshua A. Weinberg	Philip H. Newman, Esq.
Vice President and Counsel	Goodwin Procter LLP
SSgA Funds Management, Inc.	Exchange Place
One Lincoln Street	Boston, Massachusetts 02109
Boston, Massachusetts 02111-2900

Approximate Date of Proposed Public Offering: As soon as practicable after the effective date of this Registration Statement.

It is proposed that this filing will become effective under Rule 485:

x immediately upon filing pursuant to paragraph (b)

¨ on (                    ) pursuant to paragraph (b)

¨ 60 days after filing pursuant to paragraph (a)

¨ on (date) pursuant to paragraph (a)(1)

¨ 75 days after filing pursuant to paragraph (a)(2)

¨ on (date) pursuant to paragraph (a)(2) of Rule 485

If appropriate, check the following:

¨ This post-effective amendment designates a new effective date for a previously filed post-effective amendment.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933 and the Investment Company Act of 1940, the Registrant, the SSgA Funds, certifies that it meets all of the requirements for effectiveness of this Post-Effective Amendment No. 116 to its Registration Statement pursuant to Rule 485(b) under the Securities Act of 1933 and has duly caused this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized in the City of Boston, and Commonwealth of Massachusetts, on the 7th day of January, 2013.

SSGA FUNDS, REGISTRANT

/s/ Ellen M. Needham

By Ellen M. Needham

President

Pursuant to the requirements of the Securities Act of 1933, this Registration Statement has been signed by the following persons in the capacities as indicated on January 7, 2013.

Signature	Title
/s/ William L. Marshall*	Trustee
William L. Marshall
/s/ Patrick J. Riley*	Trustee
Patrick J. Riley
/s/ Richard D. Shirk *	Trustee
Richard D. Shirk
/s/ Bruce D. Taber *	Trustee
Bruce D. Taber
/s/ Ellen M. Needham*	President and Chief Executive Officer

/s/ Ryan M. Louvar

*By Ryan M. Louvar

Attorney-in-fact

Executed pursuant to power of attorney filed with Post-Effective Amendment No. 116 to Registration Statement Nos. No. 33-19229; 811-5430.

SIGNATURES

This Registration Statement contains certain disclosures regarding the State Street Equity 500 Index Portfolio (the “Portfolio”), a series of State Street Master Funds (the “Trust”). The Trust has, subject to the next following sentence, duly caused this Post-Effective Amendment No. 116 to the Registration Statement on Form N-1A of SSgA Funds (the “Registrant”) to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Boston and the Commonwealth of Massachusetts on January 7, 2013. The Trust is executing this Registration Statement only in respect of the disclosures contained herein specifically describing the Trust and the Portfolio, and hereby disclaims any responsibility or liability as to any other disclosures in this Registration Statement.

STATE STREET MASTER FUNDS
By:	/s/ Ellen M. Needham
	Ellen M. Needham
	President, State Street Master Funds

This Registration Statement on Form N-1A of the Registrant has been signed below by the following persons, solely in the capacities indicated and subject to the next following sentence, on January 7, 2013. Each of the following persons is signing this Post-Effective Amendment No. 116 to this Registration Statement only in respect of the disclosures contained herein specifically describing the Trust and the Portfolio, and hereby disclaims any responsibility or liability as to any other disclosures in this Registration Statement.

SIGNATURE	TITLE
James E. Ross*	Trustee, State Street Master Funds
James E. Ross
William L. Boyan*	Trustee, State Street Master Funds
William L. Boyan
Michael F. Holland*	Trustee, State Street Master Funds
Michael F. Holland
Rina K. Spence*	Trustee, State Street Master Funds
Rina K. Spence
Douglas T. Williams*	Trustee, State Street Master Funds
Douglas T. Williams
/s/ Ellen M. Needham	President (Principal Executive Officer), State Street Master Funds
Ellen M. Needham
/s/ Laura F. Dell	Treasurer (Principal Accounting Officer), State Street Master Funds
Laura F. Dell

*By:	/s/ Mark E. Tuttle
	Mark E. Tuttle
	as Attorney-in-Fact pursuant to Powers of Attorney

SSgA FUNDS

POWER OF ATTORNEY

Each of the undersigned Trustees and Officer of SSgA Funds (the “Trust”) hereby constitutes and appoints Laura Dell, Lance Dial, Esq.; Joshua A. Weinberg, Esq.; Ryan Louvar, Esq.; Mark Tuttle, Esq., each of them with full powers of substitution, as his or her true and lawful attorney-in-fact and agent to execute in his or her name and on his or her behalf in any and all capacities the Registration Statements on Form N-1A, and any and all amendments thereto, and all other documents, filed by the Trust or its affiliates with the Securities and Exchange Commission (the “SEC”) under the Investment Company Act of 1940, as amended, and (as applicable) the Securities Act of 1933, as amended, and any and all instruments which such attorneys and agents, or any of them, deem necessary or advisable to enable the Trust or its affiliates to comply with such Acts, the rules, regulations and requirements of the SEC, the securities, Blue Sky and/or corporate/trust laws of any state or other jurisdiction, including all documents necessary to ensure the Trust has insurance and fidelity bond coverage, and to file the same with all exhibits thereto and other documents in connection therewith, with the SEC and such other jurisdictions and the undersigned hereby ratifies and confirms as his or her own act and deed any and all acts that such attorneys and agents, or any of them, shall do or cause to be done by virtue hereof. Any one of such attorneys and agents has, and may exercise, all of the powers hereby conferred. The undersigned hereby revokes any Powers of Attorney previously granted with respect to the Trust concerning the filings and actions described herein.

IN WITNESS WHEREOF, the undersigned have hereunto set their hands as of the 1^st day of January 2013.

/s/ William L. Marshall

William L. Marshall, Trustee

/s/ Patrick J. Riley

Patrick J. Riley, Trustee

/s/ Richard D. Shirk

Richard D. Shirk, Trustee

/s/ Bruce D. Taber

Bruce D. Taber, Trustee

/s/ Ellen M. Needham

Ellen M. Needham, President and Chief

Executive Officer

EXHIBIT INDEX

EXHIBIT	NAME OF EXHIBIT
EX-101.INS	XBRL Instance Document
EX-101.SCH	XBRL Taxonomy Extension Schema Document
EX-101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document
EX-101.LAB	XBRL Taxonomy Extension Labels Linkbase Document
EX-101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document
EX-101.DEF	XBRL Taxonomy Extension Definition Linkbase Document

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

SSGA FUNDS

Prospectus Date

rr_ProspectusDate

Dec. 14, 2012

SSgA U.S. Treasury Money Market Fund

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

FUND SUMMARY SSgA U.S. Treasury Money Market Fund

Objective [Heading]

rr_ObjectiveHeading

INVESTMENT OBJECTIVE

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

SSgA U.S. Treasury Money Market Fund seeks to maximize current income, to the extent consistent with the preservation of capital and liquidity and the maintenance of a stable $1.00 per share net asset value, by investing in obligations that are issued or guaranteed as to principal and interest by the U.S. government and repurchase agreements backed by such securities.

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.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder Fees
     (fees paid directly from your investment)

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

December 31, 2013

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 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, that all dividends and distributions are reinvested, and that the fund’s operating expenses remain the same. The calculation of costs for the one-year period takes into account the effect of any current contractual fee waivers and/or reimbursements; and the calculation of costs for the remaining periods takes such fee waivers and/or reimbursements into account only for the first year of the periods. 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

SSgA U.S. Treasury Money Market Fund attempts to meet its investment objective by investing principally in U.S. Treasury bills, notes and bonds (which are direct obligations of the U.S. government) and repurchase agreements backed by such securities. The fund also may invest in shares of other money market funds, including funds advised by the fund’s investment advisor.

The fund follows a disciplined investment process in which the fund’s investment advisor bases its decisions on the relative attractiveness of different money market instruments. In the advisor’s opinion, the attractiveness of an instrument may vary depending on the general level of interest rates, as well as imbalances of supply and demand in the market. The fund invests in accordance with regulatory requirements applicable to money market funds, which impose strict conditions on the quality of portfolio securities, the maturity of individual securities and the portfolio as a whole, and portfolio diversification.

Risk [Heading]

rr_RiskHeading

PRINCIPAL RISKS

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Although the fund seeks to preserve the value of your investment at $1.00 per share, it is possible to lose money by investing in the fund.

• Risks Common to Funds Investing Principally in Debt Instruments.

• Interest Rate Risk—The risk that interest rates will rise, causing the value of the fund’s assets to fall.

• Credit Risk—The risk that an issuer, guarantor or liquidity provider of an instrument held by the fund will fail to make scheduled interest or principal payments, which may reduce the fund’s income and the market value of the instrument.

• Prepayment Risk (when repayment of principal occurs before scheduled maturity) and Extension Risk (when rates of repayment of principal are slower than expected)—Applicable primarily to mortgage-related securities, the risks that the underlying loan obligations may be refinanced (repaid) faster or slower than expected, causing the fund to invest repayment proceeds in, or continue to hold, lower yielding securities, as the case may be.

• Liquidity Risk—The risk that the fund may not be able to sell some or all of its securities at desired prices or may be unable to sell the securities at all, because of a lack of demand in the market for such securities, or a liquidity provider defaults on its obligation to purchase the securities when properly tendered by the fund.

• Risk Associated with Maintaining a Stable Share Price. To the extent that the aggregate market value of the fund’s assets materially varies from the aggregate of the acquisition prices of those assets, the fund may not be able to maintain a stable share price of $1.00. This risk typically is higher during periods of rapidly changing interest rates or when issuer credit quality generally is falling, and is made worse when the fund experiences significant redemption requests.

• Concentrated Exposure to Financial Institutions. Many instruments in which the fund invests, including repurchase agreements, are issued or guaranteed by financial institutions, such as banks and brokers, or are collateralized by securities issued or guaranteed by financial institutions. Changes in the credit worthiness of any of these institutions may adversely affect the value of instruments held by the fund.

• Rapid Changes in Interest Rates. Rapid changes in interest rates may cause significant requests to redeem fund shares, and possibly cause the fund to sell portfolio securities at a loss to satisfy those requests.

• Low Short-Term Interest Rates. As short-term interest rates approach 0%, the fund may maintain substantial cash balances. The fund typically does not receive any income from uninvested cash. In addition, if the fund generates insufficient income to pay its expenses, it may not pay a daily dividend.

Please refer to “Fund Objectives, Strategies and Risks” in the Prospectus for further details.

Risk Money Market Fund [Text]

rr_RiskMoneyMarketFund

Although the fund seeks to preserve the value of your investment at $1.00 per share, it is possible to lose money by investing in the fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

PERFORMANCE

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following bar chart shows how the fund’s performance has varied from year to year, and the table immediately below the chart shows the performance of the fund over the past 1-, 5- and 10-year periods, and over the life of the fund. The bar chart and the table provide some indication of the risks of investing in the fund. A fund’s past performance (both before and after taxes) is not necessarily an indication of how the fund will perform in the future. Current performance information for the fund is available toll free by calling (877) 521-4083 or by visiting our website at www.ssgafunds.com.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The following bar chart shows how the fund’s performance has varied from year to year, and the table immediately below the chart shows the performance of the fund over the past 1-, 5- and 10-year periods, and over the life of the fund.

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

(877) 521-4083

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.ssgafunds.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

A fund’s past performance (both before and after taxes) is not necessarily an indication of how the fund will perform in the future.

Bar Chart [Heading]

rr_BarChartHeading

Annual Total Returns - SSgA U.S. Treasury Money Market Fund

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

Highest Quarterly Results (2002-2011)	Lowest Quarterly Results (2002-2011)	Year-to- Date Ended
December 31, 2006: 1.29%	December 31, 2011: 0.00%	September 30, 2012: 0.00%

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns For the Periods Ending December 31, 2011:

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

To obtain the fund’s current yield, please call (877) 521-4083.

Money Market Seven Day Yield, Caption [Text]

rr_MoneyMarketSevenDayYieldCaption

To obtain the fund’s current yield

Money Market Seven Day Yield Phone

rr_MoneyMarketSevenDayYieldPhone

(877) 521-4083

SSgA U.S. Treasury Money Market Fund | Institutional

Risk/Return:

rr_RiskReturnAbstract

Shareholder Fees (fees paid directly from your investment)

rr_ShareholderFeeOther

none

Management Fee

rr_ManagementFeesOverAssets

0.15%

Distribution and Shareholder Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.05%

Other Expenses

rr_OtherExpensesOverAssets

0.05%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.25%

Less Fee Waivers and/or Expense Reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.05%)

^[1]

Total Annual Fund Operating Expenses After Fee Waivers and Expense Reimbursements

rr_NetExpensesOverAssets

0.20%

^[1]

1 year

rr_ExpenseExampleYear01

20

3 years

rr_ExpenseExampleYear03

75

5 years

rr_ExpenseExampleYear05

136

10 years

rr_ExpenseExampleYear10

313

2002

rr_AnnualReturn2002

1.55%

2003

rr_AnnualReturn2003

0.94%

2004

rr_AnnualReturn2004

1.14%

2005

rr_AnnualReturn2005

3.02%

2006

rr_AnnualReturn2006

4.87%

2007

rr_AnnualReturn2007

4.80%

2008

rr_AnnualReturn2008

1.50%

2009

rr_AnnualReturn2009

0.00%

2010

rr_AnnualReturn2010

0.00%

2011

rr_AnnualReturn2011

0.00%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to- Date Ended

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Sep. 30, 2012

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

0.00%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarterly Results (2002-2011)

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Dec. 31, 2006

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

1.29%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarterly Results (2002-2011)

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2011

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

0.00%

1 Year

rr_AverageAnnualReturnYear01

none

^[2]

5 Years

rr_AverageAnnualReturnYear05

1.24%

^[2]

10 Years

rr_AverageAnnualReturnYear10

1.77%

^[2]

[1] The fund's investment advisor is contractually obligated until December 31, 2013 to waive 0.05% of its 0.15% management fee. Additionally, the advisor is further contractually obligated until December 31, 2013 to waive its management fee and to reimburse the fund for all expenses to the extent that total expenses (exclusive of non-recurring account fees, extraordinary expenses and acquired fund fees) exceed 0.20% of average daily net assets on an annual basis. This waiver and reimbursement may not be terminated during the relevant period except with Board approval. Extraordinary expenses that are not subject to the foregoing contractual expense limitation agreement include, but are not limited to, any reimbursement payments made by the fund to the fund's investment advisor of fund fees and expenses that were previously waived or reimbursed by the fund's investment advisor in order to maintain to avoid a non-negative net yield for the fund. The fund's investment advisor may also reduce all or a portion of its fees and/or reimburse expenses of the fund to the extent necessary to maintain a minimum net yield for the fund (the “Voluntary Reduction”) which may vary from time to time in the investment advisor's sole discretion. The fund has agreed, subject to certain limitations, to reimburse its investment advisor for the full dollar amount of any Voluntary Reduction incurred after August 1, 2012. As of August 1, 2012, the fund's investment advisor waived fees and/or reimbursed expenses in the amount of $675,397 under the voluntary yield waiver. Any future reimbursement of previously waived fees by the fund to its investment advisor may cause the total fund annual operating expenses of the fund to exceed the expense limitation under the contractual expense limitation agreement. The investment advisor may, in its sole discretion, irrevocably waive receipt of any or all reimbursement amounts due from the fund, without limitation. Total Annual Fund Operating Expenses may be higher than the fund's ratio of expenses to average net assets shown in the Financial Highlights, which reflect the operating expenses of the fund including voluntary waivers.

[2] The returns would have been lower without the contractual and voluntary management fee waiver and/or expense reimbursement.

XML

SSgA Prime Money Market Fund

FUND SUMMARY SSgA PRIME MONEY MARKET FUND

INVESTMENT OBJECTIVE

SSgA Prime Money Market Fund seeks to maximize current income, to the extent consistent with the preservation of capital and liquidity and the maintenance of a stable $1.00 per share net asset value, by investing in dollar denominated securities.

FEES AND EXPENSES OF THE FUND

This table describes the fees and expenses that you may pay if you buy and hold shares of the fund.

Shareholder Fees (USD $)	SSgA Prime Money Market Fund Institutional
Shareholder Fees (fees paid directly from your investment)	none

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

Annual Fund Operating Expenses		SSgA Prime Money Market Fund Institutional
Management Fee		0.15%
Distribution and Shareholder Service (12b-1) Fees		0.05%
Other Expenses		0.05%
Total Annual Fund Operating Expenses		0.25%
Less Fee Waivers and/or Expense Reimbursements	[1]	(0.05%)
Total Annual Fund Operating Expenses After Fee Waivers and Expense Reimbursements	[1]	0.20%

EXAMPLE

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, that all dividends and distributions are reinvested, and that the fund’s operating expenses remain the same. The calculation of costs for the one-year period takes into account the effect of any current contractual fee waivers and/or reimbursements; and the calculation of costs for the remaining periods takes such fee waivers and/or reimbursements into account only for the first year of the periods. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:

Expense Example (USD $)	1 year	3 years	5 years	10 years
SSgA Prime Money Market Fund Institutional	20	75	136	313

PRINCIPAL INVESTMENT STRATEGIES

SSgA Prime Money Market Fund follows a disciplined investment process in which the fund’s investment advisor bases its decisions on the relative attractiveness of different money market instruments. In the advisor’s opinion, the attractiveness of an instrument may vary depending on the general level of interest rates, as well as imbalances of supply and demand in the market. The fund invests in accordance with regulatory requirements applicable to money market funds, which impose strict conditions on the quality of portfolio securities, liquidity of portfolio holdings, the maturity of individual securities and the portfolio as a whole, and portfolio diversification.

The fund attempts to meet its investment objective by investing in a broad range of money market instruments. The fund considers the following instruments or investment strategies to be principal to the achievement of its investment objective: U.S. government securities, including U.S. Treasury bills, notes and bonds and securities issued or guaranteed by U.S. government agencies; certificates of deposits and time deposits of U.S. and foreign banks; commercial paper and other high quality obligations of U.S. or foreign companies; asset-backed securities, including asset-backed commercial paper; and repurchase agreements. These instruments may bear fixed, variable or floating rates of interest or may be zero coupon securities. The fund also may invest in shares of other money market funds, including funds advised by the fund’s investment advisor.

PRINCIPAL RISKS

An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Although the fund seeks to preserve the value of your investment at $1.00 per share, it is possible to lose money by investing in the fund.

• Risks Common to Funds Investing Principally in Debt Instruments.

• Interest Rate Risk—The risk that interest rates will rise, causing the value of the fund’s assets to fall.

• Credit Risk—The risk that an issuer, guarantor or liquidity provider of an instrument held by the fund will fail to make scheduled interest or principal payments, which may reduce the fund’s income and the market value of the instrument.

• Prepayment Risk (when repayment of principal occurs before scheduled maturity) and Extension Risk (when rates of repayment of principal are slower than expected)—Applicable primarily to mortgage-related securities, the risks that the underlying loan obligations may be refinanced (repaid) faster or slower than expected, causing the fund to invest repayment proceeds in, or continue to hold, lower yielding securities, as the case may be.

• Liquidity Risk—The risk that the fund may not be able to sell some or all of its securities at desired prices or may be unable to sell the securities at all, because of a lack of demand in the market for such securities, or a liquidity provider defaults on its obligation to purchase the securities when properly tendered by the fund.

• Risk Associated with Maintaining a Stable Share Price. To the extent that the aggregate market value of the fund’s assets materially varies from the aggregate of the acquisition prices of those assets, the fund may not be able to maintain a stable share price of $1.00. This risk typically is higher during periods of rapidly changing interest rates or when issuer credit quality generally is falling, and is made worse when the fund experiences significant redemption requests.

• Rapid Changes in Interest Rates. Rapid changes in interest rates may cause significant requests to redeem fund shares, and possibly cause the fund to sell portfolio securities at a loss to satisfy those requests.

• Low Short-Term Interest Rates. As short-term interest rates approach 0%, the fund may maintain substantial cash balances. The fund typically does not receive any income from uninvested cash. In addition, if the fund generates insufficient income to pay its expenses, it may not pay a daily dividend.
• Concentrated Exposure to Financial Institutions. Many instruments in which the fund invests, including repurchase agreements, are issued or guaranteed by financial institutions, such as banks and brokers, or are collateralized by securities issued or guaranteed by financial institutions. Changes in the credit worthiness of any of these institutions may adversely affect the value of instruments held by the fund.

• Asset-Backed Securities Risk. Defaults on the underlying assets of the asset-backed securities held by the fund may impair the value of the securities, and there may be limitations on the enforceability of any security interest granted with respect to those assets. These securities also present a higher degree of prepayment risk (when repayment of principal occurs before scheduled maturity) and extension risk (when rates of repayment of principal are slower than expected) than do other types of fixed income securities.

• Foreign Securities. The fund may invest in U.S. dollar denominated instruments issued by foreign governments, corporations and financial institutions. Financial information relating to foreign issuers may be more limited than financial information generally available for domestic issuers. In addition, the value of instruments of foreign issuers may be adversely affected by local or regional political and economic developments.

Please refer to “Fund Objectives, Strategies and Risks” in the Prospectus for further details.

PERFORMANCE

The following bar chart shows how the fund’s performance has varied from year to year, and the table immediately below the chart shows the performance of the fund over the past 1-, 5- and 10-year periods, and over the life of the fund. The bar chart and the table provide some indication of the risks of investing in the fund. A fund’s past performance (both before and after taxes) is not necessarily an indication of how the fund will perform in the future. Current performance information for the fund is available toll free by calling (877) 521-4083 or by visiting our website at www.ssgafunds.com.

Annual Total Returns - SSgA Prime Money Market Fund

Highest Quarterly Results (2002-2011)	Lowest Quarterly Results (2002-2011)	Year-to- Date Ended
September 30, 2007: 1.31%	September 30, 2011: 0.01%	September 30, 2012: 0.09%

Average Annual Total Returns For the Periods Ending December 31, 2011:

Average Annual Total Returns		1 Year	5 Years	10 Years
SSgA Prime Money Market Fund Institutional	[1]	0.08%	1.70%	2.05%

To obtain the fund’s current yield, please call (877) 521-4083.

[1] The fund's investment advisor is contractually obligated until December 31, 2013 to waive 0.05% of its 0.15% management fee. Additionally, the advisor is further contractually obligated until December 31, 2013 to waive its management fee and to reimburse the fund for all expenses to the extent that total expenses (exclusive of non-recurring account fees, extraordinary expenses and acquired fund fees) exceed 0.20% of average daily net assets on an annual basis. This waiver and reimbursement may not be terminated during the relevant period except with Board approval. Extraordinary expenses that are not subject to the foregoing contractual expense limitation agreement include, but are not limited to, any reimbursement payments made by the fund to the fund's investment advisor of fund fees and expenses that were previously waived or reimbursed by the fund's investment advisor in order to maintain to avoid a non-negative net yield for the fund. The fund's investment advisor may also reduce all or a portion of its fees and/or reimburse expenses of the fund to the extent necessary to maintain a minimum net yield for the fund (the "Voluntary Reduction") which may vary from time to time in the investment advisor's sole discretion. The fund has agreed, subject to certain limitations, to reimburse its investment advisor for the full dollar amount of any Voluntary Reduction incurred after August 1, 2012. As of August 1, 2012, the fund's investment advisor has not waived fees and/or reimbursed expenses under the voluntary yield waiver. Any future reimbursement of previously waived fees by the fund to its investment advisor may cause the total fund annual operating expenses of the fund to exceed the expense limitation under the contractual expense limitation agreement. The investment advisor may, in its sole discretion, irrevocably waive receipt of any or all reimbursement amounts due from the fund, without limitation.

[1] The returns would have been lower without the contractual and voluntary management fee waiver and/or expense reimbursement.

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

SSGA FUNDS

Prospectus Date

rr_ProspectusDate

Dec. 14, 2012

SSgA Enhanced Small Cap Fund

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

FUND SUMMARY SSgA ENHANCED SMALL CAP FUND

Objective [Heading]

rr_ObjectiveHeading

INVESTMENT OBJECTIVE

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

SSgA Enhanced Small Cap Fund seeks to maximize total return through investment primarily in small capitalization equity securities.

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.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder Fees
     (fees paid directly from your investment)

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

December 31, 2013

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 may indicate higher transaction costs and may result in higher taxes when fund 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 turnover rate was 64% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

64.00%

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 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, that all dividends and distributions are reinvested, and that the fund’s operating expenses remain the same. The calculation of costs for the one-year period takes into account the effect of any current contractual fee waivers and/or reimbursements; and the calculation of costs for the remaining periods takes such fee waivers and/or reimbursements into account only for the first year of the periods. 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

SSgA Enhanced Small Cap Fund will invest at least 80% of its net assets (plus borrowings, if any) in equity securities of small capitalization companies. A small capitalization company is a company with a market capitalization no larger than the company with the largest capitalization contained in the Russell 2000 Index. The equity securities invested in by the fund are comprised primarily of common stocks and may include IPOs.

To manage the fund’s portfolio, the fund’s advisor employs a proprietary quantitative multi-factor stock-selection model to select securities that maintain similar sector and industry weightings as the fund’s benchmark, while controlling risk exposure of the fund relative to the fund’s benchmark. The securities selected by the model include a core portfolio drawn from securities in the fund’s benchmark and intended to reflect the risk characteristics of the fund’s benchmark, and certain additional securities of small capitalization companies identified by the model in order to overweight or underweight certain securities, industries and sectors represented in the fund’s benchmark. The model evaluates the relative attractiveness of securities of small capitalization companies based on the correlation of certain historical economic and financial factors (such as measures of growth potential, valuation, quality and share price momentum) to past performance and then rank the securities in the order of their attractiveness as fund investments. The model determines the specific securities that the fund invests in, the quantity of a security held by the fund and whether to overweight or underweight certain securities, industries or sectors relative to the benchmark based on an evaluation of a security’s relative return and risk attractiveness.

The fund periodically rebalances its portfolio to reflect movements in the underlying factors used by the model and changes predicted by the model. The advisor regularly reexamines the model and may make updates or adjustments to the economic and financial factors considered.

From time to time, the advisor may make a qualitative judgment and deviate from the model, but only for events that are not quantifiable by the model.

The fund also may lend its securities, and it may invest in various fixed-income securities and money market funds, including money market funds advised by the fund’s investment advisor, in order to manage its cash. The fund also may engage in active trading, which could reduce the returns of fund shareholders investing through a taxable account, and the fund may take temporary defensive positions that are inconsistent with its principal investment strategies.

Risk [Heading]

rr_RiskHeading

PRINCIPAL RISKS

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

It is possible to lose money by investing in the fund. 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.

• Risks Common to Funds Investing Principally in Equity Securities.

• Market, Industry and Specific Holdings—The share price of the fund may fall because of weakness in the stock markets, generally, weaknesses with respect to a particular industry in which the fund has significant holdings, or weaknesses associated with one or more specific companies in which the fund may have substantial investments.

• Liquidity Risk—The risk that the fund may not be able to sell some or all of its securities at desired prices or may be unable to sell the securities at all.

• Use of a Quantitative Strategy. A quantitative investment strategy generally is based on the assumption that the future performance of a specific security relative to other securities may be predicted based on the correlation of certain historical economic and financial factors to past performance. Over time, the correlation between these factors and performance may diminish, which may impair the fund’s ability to achieve its investment objective.

• More Volatility than the Fund’s Benchmark. While presenting the opportunity for excess returns relative to the Russell 2000 Index, the fund’s strategy may present a greater risk of loss and higher tracking error compared to a fund that follows a strict indexing strategy.

• Small-Capitalization Securities. Investments in small-capitalization companies typically present greater risks than investments in larger companies because small companies often have limited product lines and few managerial or financial resources. As a result, the performance of the fund may be more volatile than a fund that invests in large-cap stocks.

• Sector. The fund may have significant investments in one or more specific industry sectors, subjecting it to risks greater than general market risk.

• Derivatives. The fund’s investments in derivative instruments are subject to a number of risks, such as counterparty risk, the risk of mispricing or improper valuation, and the risk that the value of the instrument may not increase or decrease as expected.

Please refer to “Fund Objectives, Strategies and Risks” in the Prospectus for further details.

Risk Lose Money [Text]

rr_RiskLoseMoney

It is possible to lose money by investing in the fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

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.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

PERFORMANCE

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following bar chart shows how the fund’s performance has varied from year to year, and the table immediately below the chart shows the performance of the fund over the past 1-, 5- and 10-year periods, and over the life of the fund, and compares the fund’s performance to the performance of a broad-based securities market index. The bar chart and the table provide some indication of the risks of investing in the fund. Index returns do not reflect deductions for fees, taxes or expenses associated with investment in a fund. A fund’s past performance (both before and after taxes) is not necessarily an indication of how the fund will perform in the future. Current performance information for the fund is available toll free by calling (800) 647-7327 or by visiting our website at www.ssgafunds.com.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The following bar chart shows how the fund’s performance has varied from year to year, and the table immediately below the chart shows the performance of the fund over the past 1-, 5- and 10-year periods, and over the life of the fund, and compares the fund’s performance to the performance of a broad-based securities market index.

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

(800) 647-7327

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.ssgafunds.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

A fund’s past performance (both before and after taxes) is not necessarily an indication of how the fund will perform in the future.

Bar Chart [Heading]

rr_BarChartHeading

Annual Total Returns - SSgA Enhanced Small Cap Fund

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

Highest Quarterly Results (2006-2010)	Lowest Quarterly Results (2006-2010)	Year-to- Date Ended
June 30, 2009: 19.10%	December 31, 2008: (26.68)%	September 30, 2012: 13.96%

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns For the Periods Ending December 31, 2011:

Index No Deduction for Fees, Expenses, Taxes [Text]

rr_IndexNoDeductionForFeesExpensesTaxes

Index returns do not reflect deductions for fees, taxes or expenses associated with investment in a fund.

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

After-tax returns depend on an investor’s tax situation and may differ from those shown, and after-tax returns are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts (IRAs).

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

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

SSgA Enhanced Small Cap Fund | Institutional

Risk/Return:

rr_RiskReturnAbstract

Shareholder Fees (fees paid directly from your investment)

rr_ShareholderFeeOther

none

Management Fee

rr_ManagementFeesOverAssets

0.45%

Distribution and Shareholder Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.22%

Other Expenses

rr_OtherExpensesOverAssets

0.91%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.58%

Less Fee Waivers and/or Expense Reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.83%)

^[1]

Total Annual Fund Operating Expenses After Fee Waivers and Expense Reimbursements

rr_NetExpensesOverAssets

0.75%

^[1]

1 year

rr_ExpenseExampleYear01

77

3 years

rr_ExpenseExampleYear03

417

5 years

rr_ExpenseExampleYear05

782

10 years

rr_ExpenseExampleYear10

1,808

2006

rr_AnnualReturn2006

18.29%

2007

rr_AnnualReturn2007

(8.70%)

2008

rr_AnnualReturn2008

(37.17%)

2009

rr_AnnualReturn2009

23.16%

2010

rr_AnnualReturn2010

30.16%

2011

rr_AnnualReturn2011

0.55%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Ended

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Sep. 30, 2012

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

13.96%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarterly Results (2006-2010)

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

19.10%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarterly Results (2006-2010)

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(26.68%)

1 Year

rr_AverageAnnualReturnYear01

0.55%

^[2]

5 Years

rr_AverageAnnualReturnYear05

(1.56%)

^[2]

Since Inception

rr_AverageAnnualReturnSinceInception

3.01%

^[2],[3]

SSgA Enhanced Small Cap Fund | Return After Taxes on Distributions | Institutional

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

0.26%

^[2]

5 Years

rr_AverageAnnualReturnYear05

(1.84%)

^[2]

Since Inception

rr_AverageAnnualReturnSinceInception

2.51%

^[2],[3]

SSgA Enhanced Small Cap Fund | Return After Taxes on Distributions and Sale of Fund Shares | Institutional

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

0.35%

^[2]

5 Years

rr_AverageAnnualReturnYear05

(1.40%)

^[2]

Since Inception

rr_AverageAnnualReturnSinceInception

2.43%

^[2],[3]

SSgA Enhanced Small Cap Fund | Russell 2000® Index (reflects no deduction for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(4.18%)

^[2]

5 Years

rr_AverageAnnualReturnYear05

0.15%

^[2]

Since Inception

rr_AverageAnnualReturnSinceInception

4.07%

^[2],[3]

[1] The fund’s investment advisor is contractually obligated until December 31, 2013 to waive its management fee and to reimburse the fund for expenses to the extent that total expenses (exclusive of non-recurring account fees, extraordinary expenses and acquired fund fees) exceed 0.75% of average daily net assets on an annual basis. This waiver and reimbursement may not be terminated during the relevant period except with Board approval.

[2] The returns would have been lower without the contractual fee waiver and/or expense reimbursement.

[3] The Fund began operating on March 22, 2005.

XML

SSgA Tuckerman Active REIT Fund

FUND SUMMARY SSgA TUCKERMAN ACTIVE REIT FUND

INVESTMENT OBJECTIVE

SSgA Tuckerman Active REIT Fund seeks to provide income and capital growth by investing primarily in publicly traded securities issued by real estate investment trusts.

FEES AND EXPENSES OF THE FUND

This table describes the fees and expenses that you may pay if you buy and hold shares of the fund.

Shareholder Fees (USD $)	SSgA Tuckerman Active REIT Fund Institutional
Shareholder Fees (fees paid directly from your investment)	none

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

Annual Fund Operating Expenses		SSgA Tuckerman Active REIT Fund Institutional
Management Fee		0.65%
Distribution and Shareholder Service (12b-1) Fees		0.25%
Other Expenses		0.42%
Total Annual Fund Operating Expenses		1.32%
Less Fee Waivers and/or Expense Reimbursements	[1]	(0.32%)
Total Annual Fund Operating Expenses After Fee Waivers and Expense Reimbursements	[1]	1.00%

EXAMPLE

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, that all dividends and distributions are reinvested, and that the fund’s operating expenses remain the same. The calculation of costs for the one-year period takes into account the effect of any current contractual fee waivers and/or reimbursements; and the calculation of costs for the remaining periods takes such fee waivers and/or reimbursements into account only for the first year of the periods. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:

Expense Example (USD $)	1 year	3 years	5 years	10 years
SSgA Tuckerman Active REIT Fund Institutional	102	387	693	1,562

PORTFOLIO TURNOVER

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 fund 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 turnover rate was 21% of the average value of its portfolio.

PRINCIPAL INVESTMENT STRATEGIES

SSgA Tuckerman Active REIT Fund invests at least 80% of its net assets (plus borrowings, if any) in real estate investment trusts, or REITs. The fund is non-diversified, that is, compared with other funds, the fund may invest a greater percentage of its assets in a particular issuer. The fund attempts to meet its objective through the active selection of REITs, primarily from those securities in the Dow Jones U.S. Select REIT^® Index, and across different industry types and regions based on the fundamental research of the fund’s advisor. The fund invests with a relatively long-term horizon.

In addition to REIT securities, the fund may invest up to 20% of its assets in non-REIT real estate securities, as well as equity and fixed income securities of non-real estate companies. The fund also may lend its securities, and it may invest in various fixed-income securities and money market funds, including money market funds advised by the fund’s investment advisor, in order to manage its cash. The fund may take temporary defensive positions that are inconsistent with its principal investment strategies.

PRINCIPAL RISKS

It is possible to lose money by investing in the fund. 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.

Investing in this fund may involve more risks, and consequently, the fund may have a more volatile share price than a fund investing primarily in a diversified portfolio of equity securities of large, established U.S. corporations.

• Risks Common to Funds Investing Principally in Equity Securities.
• Market, Industry and Specific Holdings—The share price of the fund may fall because of weakness in the stock markets, generally, weaknesses with respect to a particular industry in which the fund has significant holdings, or weaknesses associated with one or more specific companies in which the fund may have substantial investments.
• Liquidity Risk—The risk that the fund may not be able to sell some or all of its securities at desired prices or may be unable to sell the securities at all.
• Non-Diversified Investments. To the extent the fund’s investments are weighted heavily in the securities of one or a few issuers, developments affecting those issuers are likely to have a greater impact on the fund’s share price.
• Real Estate Securities. The fund’s investments in companies that hold or manage real estate, including REITs, are subject to many of the risks associated with direct ownership of real estate, and may be affected by changes in general and local economic conditions and lack of diversification.

Please refer to “Fund Objectives, Strategies and Risks” in the Prospectus for further details.

PERFORMANCE

The following bar chart shows how the fund’s performance has varied from year to year, and the table immediately below the chart shows the performance of the fund over the past 1-, 5- and 10-year periods, and over the life of the fund, and compares the fund’s performance to the performance of a broad-based securities market index. The bar chart and the table provide some indication of the risks of investing in the fund. Index returns do not reflect deductions for fees, taxes or expenses associated with investment in a fund. A fund’s past performance (both before and after taxes) is not necessarily an indication of how the fund will perform in the future. Current performance information for the fund is available toll free by calling (800) 647-7327 or by visiting our website at www.ssgafunds.com.

Annual Total Returns - SSgA Tuckerman Active REIT Fund

Highest Quarterly Results (2002-2011)	Lowest Quarterly Results (2002-2011)	Year-to- Date Ended
September 30, 2009: 30.54%	December 31, 2008: (41.84)%	September 30, 2012: 13.32%

Average Annual Total Returns For the Periods Ending December 31, 2011:

Average Annual Total Returns SSgA Tuckerman Active REIT Fund		1 Year	5 Years	10 Years
Institutional	[1]	10.16%	(3.60%)	9.58%
Institutional Return After Taxes on Distributions	[1]	9.61%	(5.34%)	7.64%
Institutional Return After Taxes on Distributions and Sale of Fund Shares	[1]	6.58%	(3.55%)	7.67%
Dow Jones U.S. Select REIT® Index (reflects no deduction for fees, expenses or taxes)	[1]	9.24%	(1.96%)	10.16%

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

[1] The fund's investment advisor is contractually obligated until December 31, 2013 to waive its management fee and to reimburse the fund for expenses to the extent that total expenses (exclusive of non-recurring account fees, extraordinary expenses and acquired fund fees) exceed 1.00% of average daily net assets on an annual basis. This waiver and reimbursement may not be terminated during the relevant period except with Board approval.

[1] The returns would have been lower without the contractual fee waiver and/or expense reimbursement.

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

SSGA FUNDS

Prospectus Date

rr_ProspectusDate

Dec. 14, 2012

SSgA International Stock Selection Fund

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

FUND SUMMARY SSgA INTERNATIONAL STOCK SELECTION FUND

Objective [Heading]

rr_ObjectiveHeading

INVESTMENT OBJECTIVE

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

SSgA International Stock Selection Fund seeks to provide long-term capital growth by investing primarily in securities of foreign issuers.

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.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder Fees
     (fees paid directly from your investment)

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

December 31, 2013

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 may indicate higher transaction costs and may result in higher taxes when fund 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 turnover rate was 90% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

90.00%

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 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, that all dividends and distributions are reinvested, and that the fund’s operating expenses remain the same. The calculation of costs for the one-year period takes into account the effect of any current contractual fee waivers and/or reimbursements; and the calculation of costs for the remaining periods takes such fee waivers and/or reimbursements into account only for the first year of the periods. 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

SSgA International Stock Selection Fund will invest at least 80% of its net assets (plus borrowings, if any) in equity securities issued by companies in the countries and industries represented in the MSCI EAFE Index, the fund’s benchmark. The equity securities invested in by the fund are comprised primarily of common stocks and may include IPOs as well as ETFs for cash equitization purposes.

The fund’s advisor employs a proprietary quantitative stock-selection model. This model is intended to reflect the risk characteristics of the fund’s benchmark, as well as determine the specific securities and quantities the fund purchases, holds and sells. In addition, it is intended to predict the relative attractiveness of securities from a specified investment universe based on the correlation of certain historical economic and financial factors applicable to issuers and/or countries (such as measures of growth potential, valuation, quality, and investor sentiment) to past performance. Additionally the model may also incorporate an element to evaluate the macroeconomic environment for a portion of the model determined by prevailing market conditions. This element allows a disciplined approach to seek to be adaptive to the macroeconomic environment and respond to changing conditions. The quantitative model allows the advisor to evaluate quickly each eligible security and then rank all eligible securities in the fund’s investment universe in the order of their attractiveness as fund investments.

The model generates a portfolio that is drawn primarily from securities in the fund’s benchmark. The remaining securities are drawn from the fund’s investment universe and are determined by the model in order to overweight or underweight certain countries, securities, industries and sectors represented in the benchmark. The fund’s investment universe is the securities in the MSCI EAFE Universe, which is broader than the fund’s benchmark. The fund periodically rebalances its portfolio to reflect movements in the underlying factors used by the model and changes predicted by the model. The model may periodically adjust the quantitative metrics used based on a systematic and objective evaluation of macroeconomic conditions. The advisor also regularly reexamines the model and may make updates and adjustments to the economic and financial conditions and other quantitative metrics considered, and to the weightings among them.

The fund attempts to meet its investment objective by investing primarily in, among other things, common stocks. The fund also may lend its securities, and it may invest in various fixed-income securities, index futures and money market funds in order to manage its cash. The fund also may engage in active trading, which could reduce the returns of fund shareholders investing through a taxable account, the fund may take temporary defensive positions that are inconsistent with its principal investment strategies.

Risk [Heading]

rr_RiskHeading

PRINCIPAL RISKS

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

It is possible to lose money by investing in the fund. 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.

• Risks Common to Funds Investing Principally in Equity Securities.

• Market, Industry and Specific Holdings—The share price of the fund may fall because of weakness in the stock markets, generally, weaknesses with respect to a particular industry in which the fund has significant holdings, or weaknesses associated with one or more specific companies in which the fund may have substantial investments.

• Liquidity Risk—The risk that the fund may not be able to sell some or all of its securities at desired prices or may be unable to sell the securities at all.

• Use of a Quantitative Strategy. A quantitative investment strategy generally is based on the assumption that the future performance of a specific security relative to other securities may be predicted based on the correlation of certain historical economic and financial factors to past performance. Over time, the correlation between these factors and performance may diminish, which may impair the fund’s ability to achieve its investment objective.

• Foreign Securities, including Emerging Market Securities. To the extent the fund holds securities of foreign issuers, financial information concerning those issuers may be unavailable or more limited than information generally available from U.S. issuers, and it may have difficulty selling the securities or protecting its investment. Foreign securities also tend to be adversely affected by local or regional political and economic developments, as well as changes in exchange rates, and the inconvertibility of local currency into U.S. dollars. For emerging market equity securities, these risks tend to be greater than for securities of issuers located in more developed countries.

• Sector. The fund may have significant investments in one or more specific industry sectors, subjecting it to risks greater than general market risk.

• Derivatives. The fund’s investments in derivative instruments are subject to a number of risks, such as counterparty risk, the risk of mispricing or improper valuation, and the risk that the value of the instrument may not increase or decrease as expected.

Please refer to “Fund Objectives, Strategies and Risks” in the Prospectus for further details.

Risk Lose Money [Text]

rr_RiskLoseMoney

It is possible to lose money by investing in the fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

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.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

PERFORMANCE

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following bar chart shows how the fund’s performance has varied from year to year, and the table immediately below the chart shows the performance of the fund over the past 1-, 5- and 10-year periods, and over the life of the fund, and compares the fund’s performance to the performance of a broad-based securities market index. The bar chart and the table provide some indication of the risks of investing in the fund. Index returns do not reflect deductions for fees, taxes or expenses associated with investment in a fund. A fund’s past performance (both before and after taxes) is not necessarily an indication of how the fund will perform in the future. Current performance information for the fund is available toll free by calling (800) 647-7327 or by visiting our website at www.ssgafunds.com.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The following bar chart shows how the fund’s performance has varied from year to year, and the table immediately below the chart shows the performance of the fund over the past 1-, 5- and 10-year periods, and over the life of the fund, and compares the fund’s performance to the performance of a broad-based securities market index.

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

(800) 647-7327

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.ssgafunds.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

A fund’s past performance (both before and after taxes) is not necessarily an indication of how the fund will perform in the future.

Bar Chart [Heading]

rr_BarChartHeading

Average Annual Total Returns - SSgA International Stock Selection Fund

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

Highest Quarterly Results (2002-2011)	Lowest Quarterly Results (2002-2011)	Year-to- Date Ended
June 30, 2009: 20.47%	September 30, 2011: (22.85)%	September 30, 2012: 7.64%

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns
For the Periods Ending December 31, 2011:

Index No Deduction for Fees, Expenses, Taxes [Text]

rr_IndexNoDeductionForFeesExpensesTaxes

Index returns do not reflect deductions for fees, taxes or expenses associated with investment in a fund.

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

After-tax returns depend on an investor’s tax situation and may differ from those shown, and after-tax returns are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts (IRAs).

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

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

SSgA International Stock Selection Fund | Institutional

Risk/Return:

rr_RiskReturnAbstract

Shareholder Fees (fees paid directly from your investment)

rr_ShareholderFeeOther

none

Management Fee

rr_ManagementFeesOverAssets

0.75%

Distribution and Shareholder Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.24%

Other Expenses

rr_OtherExpensesOverAssets

0.22%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.21%

Less Fee Waivers and/or Expense Reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.21%)

^[1]

Total Annual Fund Operating Expenses After Fee Waivers and Expense Reimbursements

rr_NetExpensesOverAssets

1.00%

^[1]

1 year

rr_ExpenseExampleYear01

102

3 years

rr_ExpenseExampleYear03

363

5 years

rr_ExpenseExampleYear05

645

10 years

rr_ExpenseExampleYear10

1,447

2002

rr_AnnualReturn2002

(13.70%)

2003

rr_AnnualReturn2003

42.89%

2004

rr_AnnualReturn2004

21.05%

2005

rr_AnnualReturn2005

17.04%

2006

rr_AnnualReturn2006

30.54%

2007

rr_AnnualReturn2007

6.90%

2008

rr_AnnualReturn2008

(41.49%)

2009

rr_AnnualReturn2009

22.92%

2010

rr_AnnualReturn2010

7.84%

2011

rr_AnnualReturn2011

(15.03%)

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Ended

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Sep. 30, 2012

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

7.64%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarterly Results (2002-2011)

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

20.47%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarterly Results (2002-2011)

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Sep. 30, 2011

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(22.85%)

1 Year

rr_AverageAnnualReturnYear01

(15.03%)

^[2]

5 Years

rr_AverageAnnualReturnYear05

(6.77%)

^[2]

10 Years

rr_AverageAnnualReturnYear10

4.86%

^[2]

SSgA International Stock Selection Fund | Return After Taxes on Distributions | Institutional

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(16.16%)

^[2]

5 Years

rr_AverageAnnualReturnYear05

(7.24%)

^[2]

10 Years

rr_AverageAnnualReturnYear10

4.41%

^[2]

SSgA International Stock Selection Fund | Return After Taxes on Distributions and Sale of Fund Shares | Institutional

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(9.75%)

^[2]

5 Years

rr_AverageAnnualReturnYear05

(5.57%)

^[2]

10 Years

rr_AverageAnnualReturnYear10

4.31%

^[2]

SSgA International Stock Selection Fund | MSCI® EAFE® Net Dividend Index (reflects no deduction for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(12.14%)

^[2]

5 Years

rr_AverageAnnualReturnYear05

(4.72%)

^[2]

10 Years

rr_AverageAnnualReturnYear10

4.67%

^[2]

[1] The fund's investment advisor is contractually obligated until December 31, 2013 to waive its management fee and to reimburse the fund for expenses to the extent that total expenses (exclusive of non-recurring account fees, extraordinary expenses and acquired fund fees) exceed 1.00% of average daily net assets on an annual basis. This waiver and reimbursement may not be terminated during the relevant period except with Board approval.

[2] The returns would have been lower without the contractual fee waiver and/or expense reimbursement.

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

SSGA FUNDS

Prospectus Date

rr_ProspectusDate

Dec. 14, 2012

SSgA IAM SHARES Fund

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

FUND SUMMARY SSgA IAM SHARES FUND

Objective [Heading]

rr_ObjectiveHeading

INVESTMENT OBJECTIVE

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

SSgA IAM SHARES Fund seeks to maximize total return primarily through investments in equity securities of companies that have entered into collective bargaining agreements with the International Association of Machinists and Aerospace Workers (“IAMAW”) or affiliated labor unions or have not been identified as having non-union sentiment.

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.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder Fees
     (fees paid directly from your investment)

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

December 31, 2013

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 may indicate higher transaction costs and may result in higher taxes when fund 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 turnover rate was less than 3% of the average value of its portfolio.

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 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, that all dividends and distributions are reinvested, and that the fund’s operating expenses remain the same. The calculation of costs for the one-year period takes into account the effect of any current contractual fee waivers and/or reimbursements; and the calculation of costs for the remaining periods takes such fee waivers and/or reimbursements into account only for the first year of the periods. 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

SSgA IAM SHARES Fund will invest at least 80% of its net assets (plus borrowings, if any) in equity securities of companies (“IAM Companies”) that:

• Have entered into collective bargaining agreements with the IAMAW or affiliated labor unions, or
• Are listed in the S&P 500® Index, and have not been identified by the IAMAW or affiliated labor unions as having non-union sentiment.

The fund may invest up to 20% of its assets in securities of non-IAM Companies that have not been deemed to have non-union sentiment by the IAMAW.

The fund’s investment strategy is driven by a quantitative investment process that manages portfolio exposure to fundamental attributes in a multifactor risk model environment. These attributes include industry allocations as well as factors such as size, style, growth expectations and valuation ratios. This model attempts to create a portfolio reflecting risk and return characteristics similar to those of the S&P 500 Index.

IAM Companies are diverse both geographically and by industry. The portfolio management team will rebalance the fund periodically in order to maintain its relative exposure to IAM Companies, as well as to account for any changes to the universe of IAM Companies. While the fund seeks a high correlation with the S&P 500 Index returns, the fund will not fully replicate the S&P 500 Index; therefore, the fund’s returns will likely vary from those of the S&P 500 Index.

The fund attempts to meet its investment objective by investing primarily in, among other things, domestic common stocks and related securities, which may include securities convertible into common stocks of domestic companies and IPOs. The fund also may lend its securities, and it may invest in various fixed-income securities and money market funds, including money market funds advised by the fund’s investment advisor, in order to manage its cash. The fund may take temporary defensive positions that are inconsistent with its principal investment strategies.

Risk [Heading]

rr_RiskHeading

PRINCIPAL RISKS

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

It is possible to lose money by investing in the fund. 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.

• Risks Common to Funds Investing Principally in Equity Securities.

• Market, Industry and Specific Holdings—The share price of the fund may fall because of weakness in the stock markets, generally, weaknesses with respect to a particular industry in which the fund has significant holdings, or weaknesses associated with one or more specific companies in which the fund may have substantial investments.

• Liquidity Risk—The risk that the fund may not be able to sell some or all of its securities at desired prices or may be unable to sell the securities at all.

• Use of a Quantitative Strategy. A quantitative investment strategy generally is based on the assumption that the future performance of a specific security relative to other securities may be predicted based on the correlation of certain historical economic and financial factors to past performance. Over time, the correlation between these factors and performance may diminish, which may impair the fund’s ability to achieve its investment objective.

• Large-Capitalization Securities. Large-capitalization companies usually cannot respond as quickly as smaller companies to competitive challenges, and their growth rates tend to lag the growth rates of well-managed smaller companies during strong economic periods.

• More Volatility than the Fund’s Benchmark. While presenting the opportunity for excess returns relative to the S&P 500 Index, the fund’s strategy may present a greater risk of loss and higher tracking error compared to a fund that follows a strict indexing strategy.

• Derivatives. The fund’s investments in derivative instruments are subject to a number of risks, such as counterparty risk, the risk of mispricing or improper valuation, and the risk that the value of the instrument may not increase or decrease as expected.

• Sector. The fund may have significant investments in one or more specific industry sectors, subjecting it to risks greater than general market risk.

Please refer to “Fund Objectives, Strategies and Risks” in the Prospectus for further details.

Risk Lose Money [Text]

rr_RiskLoseMoney

It is possible to lose money by investing in the fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

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.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

PERFORMANCE

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following bar chart shows how the fund’s performance has varied from year to year, and the table immediately below the chart shows the performance of the fund over the past 1-, 5- and 10-year periods, and over the life of the fund, and compares the fund’s performance to the performance of a broad-based securities market index. The bar chart and the table provide some indication of the risks of investing in the fund. Index returns do not reflect deductions for fees, taxes or expenses associated with investment in a fund. A fund’s past performance (both before and after taxes) is not necessarily an indication of how the fund will perform in the future. Current performance information for the fund is available toll free by calling (800) 647-7327 or by visiting our website at www.ssgafunds.com.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The following bar chart shows how the fund’s performance has varied from year to year, and the table immediately below the chart shows the performance of the fund over the past 1-, 5- and 10-year periods, and over the life of the fund, and compares the fund’s performance to the performance of a broad-based securities market index.

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

(800) 647-7327

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.ssgafunds.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

A fund’s past performance (both before and after taxes) is not necessarily an indication of how the fund will perform in the future.

Bar Chart [Heading]

rr_BarChartHeading

Annual Total Returns - SSgA Iam Shares Fund

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

Highest Quarterly Results (2002-2011)	Lowest Quarterly Results (2002-2011)	Year-to- Date Ended
June 30, 2009: 16.46%	December 31, 2008: (22.24)%	September 30, 2012: 15.94%

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns
For the Periods Ending December 31, 2011:

Index No Deduction for Fees, Expenses, Taxes [Text]

rr_IndexNoDeductionForFeesExpensesTaxes

Index returns do not reflect deductions for fees, taxes or expenses associated with investment in a fund.

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

After-tax returns depend on an investor’s tax situation and may differ from those shown, and after-tax returns are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts (IRAs).

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

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

SSgA IAM SHARES Fund | Institutional

Risk/Return:

rr_RiskReturnAbstract

Shareholder Fees (fees paid directly from your investment)

rr_ShareholderFeeOther

none

Management Fee

rr_ManagementFeesOverAssets

0.25%

Distribution and Shareholder Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.06%

Other Expenses

rr_OtherExpensesOverAssets

0.20%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.51%

Less Fee Waivers and/or Expense Reimbursements

rr_FeeWaiverOrReimbursementOverAssets

none

^[1]

Total Annual Fund Operating Expenses After Fee Waivers and Expense Reimbursements

rr_NetExpensesOverAssets

0.51%

1 year

rr_ExpenseExampleYear01

51

3 years

rr_ExpenseExampleYear03

160

5 years

rr_ExpenseExampleYear05

280

10 years

rr_ExpenseExampleYear10

628

2002

rr_AnnualReturn2002

(22.97%)

2003

rr_AnnualReturn2003

28.63%

2004

rr_AnnualReturn2004

9.13%

2005

rr_AnnualReturn2005

3.69%

2006

rr_AnnualReturn2006

16.33%

2007

rr_AnnualReturn2007

5.20%

2008

rr_AnnualReturn2008

(36.60%)

2009

rr_AnnualReturn2009

26.37%

2010

rr_AnnualReturn2010

14.10%

2011

rr_AnnualReturn2011

1.81%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Ended

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Sep. 30, 2012

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

15.94%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarterly Results (2002-2011)

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

16.46%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarterly Results (2002-2011)

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(22.24%)

1 Year

rr_AverageAnnualReturnYear01

1.81%

5 Years

rr_AverageAnnualReturnYear05

(0.42%)

10 Years

rr_AverageAnnualReturnYear10

2.48%

^[2]

SSgA IAM SHARES Fund | Return After Taxes on Distributions | Institutional

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

1.25%

5 Years

rr_AverageAnnualReturnYear05

(0.77%)

10 Years

rr_AverageAnnualReturnYear10

2.17%

^[2]

SSgA IAM SHARES Fund | Return After Taxes on Distributions and Sale of Fund Shares | Institutional

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

1.17%

5 Years

rr_AverageAnnualReturnYear05

(0.46%)

10 Years

rr_AverageAnnualReturnYear10

2.04%

^[2]

SSgA IAM SHARES Fund | S&P 500® Index (reflects no deduction for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

2.11%

5 Years

rr_AverageAnnualReturnYear05

(0.25%)

10 Years

rr_AverageAnnualReturnYear10

2.92%

^[2]

[1] The fund's investment advisor is contractually obligated until December 31, 2013 to waive its management fee and to reimburse the fund for expenses to the extent that total expenses (exclusive of non-recurring account fees, extraordinary expenses and acquired fund fees) exceed 0.65% of average daily net assets on an annual basis. This waiver and reimbursement may not be terminated during the relevant period except with Board approval.

[2] The returns would have been lower without the contractual fee waiver and/or expense reimbursement.

XML

SSgA Dynamic Small Cap Fund

FUND SUMMARY SSgA DYNAMIC SMALL CAP FUND

INVESTMENT OBJECTIVE

SSgA Dynamic Small Cap Fund seeks to maximize the total return through investment in equity securities.

FEES AND EXPENSES OF THE FUND

This table describes the fees and expenses that you may pay if you buy and hold shares of the fund.

Shareholder Fees (USD $)	SSgA Dynamic Small Cap Fund Institutional
Shareholder Fees (fees paid directly from your investment)	none

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

Annual Fund Operating Expenses		SSgA Dynamic Small Cap Fund Institutional
Management Fee		0.75%
Distribution and Shareholder Service (12b-1) Fees		0.21%
Other Expenses		2.55%
Total Annual Fund Operating Expenses		3.51%
Less Fee Waivers and/or Expense Reimbursements	[1]	(2.26%)
Total Annual Fund Operating Expenses After Fee Waivers and Expense Reimbursements	[1]	1.25%

EXAMPLE

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, that all dividends and distributions are reinvested, and that the fund’s operating expenses remain the same. The calculation of costs for the one-year period takes into account the effect of any current contractual fee waivers and/or reimbursements; and the calculation of costs for the remaining periods takes such fee waivers and/or reimbursements into account only for the first year of the periods. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:

Expense Example (USD $)	1 year	3 years	5 years	10 years
SSgA Dynamic Small Cap Fund Institutional	127	867	1,628	3,633

PORTFOLIO TURNOVER

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 fund 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 turnover rate was 160% of the average value of its portfolio.

PRINCIPAL INVESTMENT STRATEGIES

SSgA Dynamic Small Cap Fund will invest at least 80% of its net assets (plus borrowings, if any) in equity securities of companies in the Russell 2000® Index, the fund’s benchmark. The fund may from time to time invest up to 20% of its assets in equity securities not included in the Russell 2000® Index. The equity securities invested in by the fund are comprised primarily of common stocks and may include IPOs as well as ETFs for cash equitization purposes.

To manage the fund’s portfolio, the fund’s advisor employs a proprietary quantitative multi-factor stock-selection model. The model evaluates the relative attractiveness of each eligible security based on the correlation of certain historical economic and financial factors (such as measures of growth potential, valuation, quality and investor sentiment), and other historical quantitative metrics. Additionally the model may also incorporate an element to evaluate the macroeconomic environment for a portion of the model determined by prevailing market conditions. This element allows a disciplined approach to seek to be adaptive to the macroeconomic environment and respond to changing conditions. The quantitative model allows the advisor to evaluate quickly each eligible security and then rank all eligible securities in the fund’s investment universe in the order of their attractiveness as fund investments.

The fund periodically rebalances its portfolio to reflect movements in the underlying factors used by the model and changes predicted by the model. The model may periodically adjust the quantitative metrics used based on a systematic and objective evaluation of macroeconomic conditions. The advisor also regularly reexamines the model and may make updates and adjustments to the economic and financial conditions and other quantitative metrics considered, and to the weightings among them.

From time to time, the advisor may make a qualitative judgment and deviate from the model, but only for events that are not quantifiable by the model.

The fund also may lend its securities, and it may invest in various fixed-income securities and money market funds, including money market funds advised by the fund’s investment advisor, in order to manage its cash. The fund also may engage in active trading, which could reduce the returns of fund shareholders investing through a taxable account, and the fund may take temporary defensive positions that are inconsistent with its principal investment strategies.

PRINCIPAL RISKS

It is possible to lose money by investing in the fund. 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.

• Risks Common to Funds Investing Principally in Equity Securities.

• Market, Industry and Specific Holdings—The share price of the fund may fall because of weakness in the stock markets, generally, weaknesses with respect to a particular industry in which the fund has significant holdings, or weaknesses associated with one or more specific companies in which the fund may have substantial investments.

• Liquidity Risk—The risk that the fund may not be able to sell some or all of its securities at desired prices or may be unable to sell the securities at all.

• Use of a Quantitative Strategy. A quantitative investment strategy generally is based on the assumption that the future performance of a specific security relative to other securities may be predicted based on the correlation of certain historical economic and financial factors to past performance. Over time, the correlation between these factors and performance may diminish, which may impair the fund’s ability to achieve its investment objective.

• Small-Capitalization Securities. Investments in small-capitalization companies typically present greater risks than investments in larger companies because small companies often have limited product lines and few managerial or financial resources. As a result, the performance of the fund may be more volatile than a fund that invests in large-cap stocks.

• Value Stocks. Certain stocks in which the fund may invest may be inexpensive relative to their earnings or assets compared to other types of stocks. These stocks may continue to be inexpensive for long periods of time and they may never realize their full value.

• Sector. The fund may have significant investments in one or more specific industry sectors, subjecting it to risks greater than general market risk.

• Derivatives. The fund’s investments in derivative instruments are subject to a number of risks, such as counterparty risk, the risk of mispricing or improper valuation, and the risk that the value of the instrument may not increase or decrease as expected.

Please refer to “Fund Objectives, Strategies and Risks” in the Prospectus for further details.

PERFORMANCE

The following bar chart shows how the fund’s performance has varied from year to year, and the table immediately below the chart shows the performance of the fund over the past 1-, 5- and 10-year periods, and over the life of the fund, and compares the fund’s performance to the performance of a broad-based securities market index. The bar chart and the table provide some indication of the risks of investing in the fund. Index returns do not reflect deductions for fees, taxes or expenses associated with investment in a fund. A fund’s past performance (both before and after taxes) is not necessarily an indication of how the fund will perform in the future. Current performance information for the fund is available toll free by calling (800) 647-7327 or by visiting our website at www.ssgafunds.com.

Annual Total Returns - SSgA Dynamic Small Cap Fund

Highest Quarterly Results (2002-2011)	Lowest Quarterly Results (2002-2011)	Year-to- Date Ended
June 30, 2003: 19.49%	December 31, 2008: (26.07)%	September 30, 2012: 15.91%

Average Annual Total Returns
For the Periods Ending December 31, 2011:

Average Annual Total Returns SSgA Dynamic Small Cap Fund		1 Year	5 Years	10 Years
Institutional	[1]	4.53%	(4.68%)	3.00%
Institutional Return After Taxes on Distributions	[1]	4.53%	(5.08%)	2.55%
Institutional Return After Taxes on Distributions and Sale of Fund Shares	[1]	2.95%	(3.97%)	2.58%
Russell 2000® Index (reflects no deduction for fees, expenses or taxes)	[1]	(4.18%)	0.15%	5.62%

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

[1] The fund's investment advisor is contractually obligated until December 31, 2013 to waive its management fee and to reimburse the fund for expenses to the extent that total expenses (exclusive of non-recurring account fees, extraordinary expenses and acquired fund fees) exceed 1.25% of average daily net assets on an annual basis. This waiver and reimbursement may not be terminated during the relevant period except with Board approval.

[1] The returns would have been lower without the contractual fee waiver and/or expense reimbursement.

XML

SSgA U.S. Government Money Market Fund

FUND SUMMARY SSgA U.S. GOVERNMENT MONEY MARKET FUND

INVESTMENT OBJECTIVE

SSgA U.S. Government Money Market Fund seeks to maximize current income, to the extent consistent with the preservation of capital and liquidity and the maintenance of a stable $1.00 per share net asset value, by investing in obligations of the U.S. government or its instrumentalities with remaining maturities of one year or less.

FEES AND EXPENSES OF THE FUND

This table describes the fees and expenses that you may pay if you buy and hold shares of the fund.

Shareholder Fees (USD $)	SSgA U.S. Government Money Market Fund Institutional
Shareholder Fees (fees paid directly from your investment)	none

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

Annual Fund Operating Expenses		SSgA U.S. Government Money Market Fund Institutional
Management Fee		0.25%
Distribution and Shareholder Service (12b-1) Fees		0.08%
Other Expenses		0.06%
Total Annual Fund Operating Expenses	[1]	0.39%

EXAMPLE

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, that all dividends and distributions are reinvested, and that the fund’s operating expenses remain the same. The calculation of costs for the one-year period takes into account the effect of any current contractual fee waivers and/or reimbursements; and the calculation of costs for the remaining periods takes such fee waivers and/or reimbursements into account only for the first year of the periods. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:

Expense Example (USD $)	1 year	3 years	5 years	10 years
SSgA U.S. Government Money Market Fund Institutional	40	125	219	493

PRINCIPAL INVESTMENT STRATEGIES

SSgA U.S. Government Money Market Fund typically invests at least 80% of its net assets (plus borrowings, if any) in instruments issued or guaranteed as to principal and interest by the U.S. government or its agencies and instrumentalities, as well as repurchase agreements secured by such instruments. These instruments may bear fixed, variable or floating rates of interest or may be zero coupon securities. The fund may make significant investments in certain mortgage-related securities, including obligations of the Federal Home Loan Mortgage Corporation, the Federal National Mortgage Association and the Federal Home Loan Bank, that are neither insured nor guaranteed by the U.S. Treasury. The fund will not invest more than 5% of its net assets (taken at current market value) in repurchase agreements maturing in more than seven days.

The fund follows a disciplined investment process that attempts to provide stability of principal, liquidity and current income through all market conditions by investing in high quality money market instruments. The fund invests in accordance with regulatory requirements applicable to money market funds, which impose strict conditions on the quality of portfolio securities, the maturity of individual securities and the portfolio as a whole, and portfolio diversification.

PRINCIPAL RISKS

An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Although the fund seeks to preserve the value of your investment at $1.00 per share, it is possible to lose money by investing in the fund.

• Risks Common to Funds Investing Principally in Debt Instruments.

• Interest Rate Risk—The risk that interest rates will rise, causing the value of the fund’s assets to fall.

• Credit Risk—The risk that an issuer, guarantor or liquidity provider of an instrument held by the fund will fail to make scheduled interest or principal payments, which may reduce the fund’s income and the market value of the instrument.

• Prepayment Risk (when repayment of principal occurs before scheduled maturity) and Extension Risk (when rates of repayment of principal are slower than expected)—Applicable primarily to mortgage-related securities, the risks that the underlying loan obligations may be refinanced (repaid) faster or slower than expected, causing the fund to invest repayment proceeds in, or continue to hold, lower yielding securities, as the case may be.

• Liquidity Risk—The risk that the fund may not be able to sell some or all of its securities at desired prices or may be unable to sell the securities at all, because of a lack of demand in the market for such securities, or a liquidity provider defaults on its obligation to purchase the securities when properly tendered by the fund.

• Government Securities. Securities of certain U.S. government agencies and instrumentalities are not guaranteed by the U.S. Treasury, and the fund must look principally to the agency or instrumentality issuing or guaranteeing the securities for repayment.

• Significant Exposure to U.S. Government Agencies and Financial Institutions. Events that would adversely affect the market prices of securities issued or guaranteed by one government agency may adversely affect the market price of securities issued or guaranteed by other government agencies. Similarly, events that would affect the market value of instruments issued by one financial institution, including repurchase agreements, may adversely affect the market value of instruments issued by similarly situated financial institutions.

• Risk Associated with Maintaining a Stable Share Price. To the extent that the aggregate market value of the fund’s assets materially varies from the aggregate of the acquisition prices of those assets, the fund may not be able to maintain a stable share price of $1.00. This risk typically is higher during periods of rapidly changing interest rates or when issuer credit quality generally is falling, and is made worse when the fund experiences significant redemption requests.

• Rapid Changes in Interest Rates. Rapid changes in interest rates may cause significant requests to redeem fund shares, and possibly cause the fund to sell portfolio securities at a loss to satisfy those requests.

• Low Short-Term Interest Rates. As short-term interest rates approach 0%, the fund may maintain substantial cash balances. The fund typically does not receive any income from uninvested cash. In addition, if the fund generates insufficient income to pay its expenses, it may not pay a daily dividend.

Please refer to “Fund Objectives, Strategies and Risks” in the Prospectus for further details.

PERFORMANCE

The following bar chart shows how the fund’s performance has varied from year to year, and the table immediately below the chart shows the performance of the fund over the past 1-, 5- and 10-year periods, and over the life of the fund. The bar chart and the table provide some indication of the risks of investing in the fund. A fund’s past performance (both before and after taxes) is not necessarily an indication of how the fund will perform in the future. Current performance information for the fund is available toll free by calling (800) 647-7327 or by visiting our website at www.ssgafunds.com.

Annual Total Returns - SSgA U.S. Government Money Market Fund

Highest Quarterly Results (2002-2011)	Lowest Quarterly Results (2002-2011)	Year-to- Date Ended
December 31, 2006: 1.24%	December 31, 2011: 0.00%	September 30, 2012: 0.00%

Average Annual Total Returns
For the Periods Ending December 31, 2011:

Average Annual Total Returns	1 Year		5 Years	10 Years
SSgA U.S. Government Money Market Fund Institutional	none	[1]	1.35%	1.75%

To obtain the fund’s current 7-day yield, please call (800) 997-7327.

[1] The fund's investment advisor may also voluntarily reduce all or a portion of its fees and/or reimburse expenses of the fund to the extent necessary to maintain a minimum net yield for the fund (the "Voluntary Reduction") which may vary from time to time in the investment advisor's sole discretion. The fund has agreed, subject to certain limitations, to reimburse its investment advisor for the full dollar amount of any Voluntary Reduction incurred after August 1, 2012. As of August 1, 2012, the fund's investment advisor waived fees and/or reimbursed expenses in the amount of $2,024,943 under the voluntary yield waiver. Any future reimbursement of previously waived fees by the fund to its investment advisor may cause the total fund annual operating expenses of the fund to exceed the expense limitation under the contractual expense limitation agreement. The investment advisor may, in its sole discretion, irrevocably waive receipt of any or all reimbursement amounts due from the fund, without limitation. Total Annual Fund Operating Expenses may be higher than the fund's ratio of expenses to average net assets shown in the Financial Highlights, which reflect the operating expenses of the fund including voluntary waivers.

[1] The returns would have been lower without the voluntary management fee waiver and/or expense reimbursement.

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

SSGA FUNDS

Prospectus Date

rr_ProspectusDate

Dec. 14, 2012

SSgA Dynamic Small Cap Fund

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

FUND SUMMARY SSgA DYNAMIC SMALL CAP FUND

Objective [Heading]

rr_ObjectiveHeading

INVESTMENT OBJECTIVE

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

SSgA Dynamic Small Cap Fund seeks to maximize the total return through investment in equity securities.

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.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder Fees
     (fees paid directly from your investment)

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

December 31, 2013

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 may indicate higher transaction costs and may result in higher taxes when fund 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 turnover rate was 160% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

160.00%

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 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, that all dividends and distributions are reinvested, and that the fund’s operating expenses remain the same. The calculation of costs for the one-year period takes into account the effect of any current contractual fee waivers and/or reimbursements; and the calculation of costs for the remaining periods takes such fee waivers and/or reimbursements into account only for the first year of the periods. 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

SSgA Dynamic Small Cap Fund will invest at least 80% of its net assets (plus borrowings, if any) in equity securities of companies in the Russell 2000® Index, the fund’s benchmark. The fund may from time to time invest up to 20% of its assets in equity securities not included in the Russell 2000® Index. The equity securities invested in by the fund are comprised primarily of common stocks and may include IPOs as well as ETFs for cash equitization purposes.

To manage the fund’s portfolio, the fund’s advisor employs a proprietary quantitative multi-factor stock-selection model. The model evaluates the relative attractiveness of each eligible security based on the correlation of certain historical economic and financial factors (such as measures of growth potential, valuation, quality and investor sentiment), and other historical quantitative metrics. Additionally the model may also incorporate an element to evaluate the macroeconomic environment for a portion of the model determined by prevailing market conditions. This element allows a disciplined approach to seek to be adaptive to the macroeconomic environment and respond to changing conditions. The quantitative model allows the advisor to evaluate quickly each eligible security and then rank all eligible securities in the fund’s investment universe in the order of their attractiveness as fund investments.

The fund periodically rebalances its portfolio to reflect movements in the underlying factors used by the model and changes predicted by the model. The model may periodically adjust the quantitative metrics used based on a systematic and objective evaluation of macroeconomic conditions. The advisor also regularly reexamines the model and may make updates and adjustments to the economic and financial conditions and other quantitative metrics considered, and to the weightings among them.

From time to time, the advisor may make a qualitative judgment and deviate from the model, but only for events that are not quantifiable by the model.

The fund also may lend its securities, and it may invest in various fixed-income securities and money market funds, including money market funds advised by the fund’s investment advisor, in order to manage its cash. The fund also may engage in active trading, which could reduce the returns of fund shareholders investing through a taxable account, and the fund may take temporary defensive positions that are inconsistent with its principal investment strategies.

Risk [Heading]

rr_RiskHeading

PRINCIPAL RISKS

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

It is possible to lose money by investing in the fund. 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.

• Risks Common to Funds Investing Principally in Equity Securities.

• Market, Industry and Specific Holdings—The share price of the fund may fall because of weakness in the stock markets, generally, weaknesses with respect to a particular industry in which the fund has significant holdings, or weaknesses associated with one or more specific companies in which the fund may have substantial investments.

• Liquidity Risk—The risk that the fund may not be able to sell some or all of its securities at desired prices or may be unable to sell the securities at all.

• Use of a Quantitative Strategy. A quantitative investment strategy generally is based on the assumption that the future performance of a specific security relative to other securities may be predicted based on the correlation of certain historical economic and financial factors to past performance. Over time, the correlation between these factors and performance may diminish, which may impair the fund’s ability to achieve its investment objective.

• Small-Capitalization Securities. Investments in small-capitalization companies typically present greater risks than investments in larger companies because small companies often have limited product lines and few managerial or financial resources. As a result, the performance of the fund may be more volatile than a fund that invests in large-cap stocks.

• Value Stocks. Certain stocks in which the fund may invest may be inexpensive relative to their earnings or assets compared to other types of stocks. These stocks may continue to be inexpensive for long periods of time and they may never realize their full value.

• Sector. The fund may have significant investments in one or more specific industry sectors, subjecting it to risks greater than general market risk.

• Derivatives. The fund’s investments in derivative instruments are subject to a number of risks, such as counterparty risk, the risk of mispricing or improper valuation, and the risk that the value of the instrument may not increase or decrease as expected.

Please refer to “Fund Objectives, Strategies and Risks” in the Prospectus for further details.

Risk Lose Money [Text]

rr_RiskLoseMoney

It is possible to lose money by investing in the fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

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.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

PERFORMANCE

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following bar chart shows how the fund’s performance has varied from year to year, and the table immediately below the chart shows the performance of the fund over the past 1-, 5- and 10-year periods, and over the life of the fund, and compares the fund’s performance to the performance of a broad-based securities market index. The bar chart and the table provide some indication of the risks of investing in the fund. Index returns do not reflect deductions for fees, taxes or expenses associated with investment in a fund. A fund’s past performance (both before and after taxes) is not necessarily an indication of how the fund will perform in the future. Current performance information for the fund is available toll free by calling (800) 647-7327 or by visiting our website at www.ssgafunds.com.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The following bar chart shows how the fund’s performance has varied from year to year, and the table immediately below the chart shows the performance of the fund over the past 1-, 5- and 10-year periods, and over the life of the fund, and compares the fund’s performance to the performance of a broad-based securities market index.

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

(800) 647-7327

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.ssgafunds.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

A fund’s past performance (both before and after taxes) is not necessarily an indication of how the fund will perform in the future.

Bar Chart [Heading]

rr_BarChartHeading

Annual Total Returns - SSgA Dynamic Small Cap Fund

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

Highest Quarterly Results (2002-2011)	Lowest Quarterly Results (2002-2011)	Year-to- Date Ended
June 30, 2003: 19.49%	December 31, 2008: (26.07)%	September 30, 2012: 15.91%

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns
For the Periods Ending December 31, 2011:

Index No Deduction for Fees, Expenses, Taxes [Text]

rr_IndexNoDeductionForFeesExpensesTaxes

Index returns do not reflect deductions for fees, taxes or expenses associated with investment in a fund.

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

After-tax returns depend on an investor’s tax situation and may differ from those shown, and after-tax returns are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts (IRAs).

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

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

SSgA Dynamic Small Cap Fund | Institutional

Risk/Return:

rr_RiskReturnAbstract

Shareholder Fees (fees paid directly from your investment)

rr_ShareholderFeeOther

none

Management Fee

rr_ManagementFeesOverAssets

0.75%

Distribution and Shareholder Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.21%

Other Expenses

rr_OtherExpensesOverAssets

2.55%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

3.51%

Less Fee Waivers and/or Expense Reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(2.26%)

^[1]

Total Annual Fund Operating Expenses After Fee Waivers and Expense Reimbursements

rr_NetExpensesOverAssets

1.25%

^[1]

1 year

rr_ExpenseExampleYear01

127

3 years

rr_ExpenseExampleYear03

867

5 years

rr_ExpenseExampleYear05

1,628

10 years

rr_ExpenseExampleYear10

3,633

2002

rr_AnnualReturn2002

(15.02%)

2003

rr_AnnualReturn2003

42.89%

2004

rr_AnnualReturn2004

20.01%

2005

rr_AnnualReturn2005

5.68%

2006

rr_AnnualReturn2006

10.86%

2007

rr_AnnualReturn2007

(13.42%)

2008

rr_AnnualReturn2008

(37.72%)

2009

rr_AnnualReturn2009

11.04%

2010

rr_AnnualReturn2010

25.76%

2011

rr_AnnualReturn2011

4.53%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Ended

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Sep. 30, 2012

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

15.91%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarterly Results (2002-2011)

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2003

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

19.49%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarterly Results (2002-2011)

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(26.07%)

1 Year

rr_AverageAnnualReturnYear01

4.53%

^[2]

5 Years

rr_AverageAnnualReturnYear05

(4.68%)

^[2]

10 Years

rr_AverageAnnualReturnYear10

3.00%

^[2]

SSgA Dynamic Small Cap Fund | Return After Taxes on Distributions | Institutional

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

4.53%

^[2]

5 Years

rr_AverageAnnualReturnYear05

(5.08%)

^[2]

10 Years

rr_AverageAnnualReturnYear10

2.55%

^[2]

SSgA Dynamic Small Cap Fund | Return After Taxes on Distributions and Sale of Fund Shares | Institutional

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

2.95%

^[2]

5 Years

rr_AverageAnnualReturnYear05

(3.97%)

^[2]

10 Years

rr_AverageAnnualReturnYear10

2.58%

^[2]

SSgA Dynamic Small Cap Fund | Russell 2000® Index (reflects no deduction for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(4.18%)

^[2]

5 Years

rr_AverageAnnualReturnYear05

0.15%

^[2]

10 Years

rr_AverageAnnualReturnYear10

5.62%

^[2]

[1] The fund's investment advisor is contractually obligated until December 31, 2013 to waive its management fee and to reimburse the fund for expenses to the extent that total expenses (exclusive of non-recurring account fees, extraordinary expenses and acquired fund fees) exceed 1.25% of average daily net assets on an annual basis. This waiver and reimbursement may not be terminated during the relevant period except with Board approval.

[2] The returns would have been lower without the contractual fee waiver and/or expense reimbursement.

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

SSGA FUNDS

Prospectus Date

rr_ProspectusDate

Dec. 14, 2012

SSgA Intermediate Fund

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

FUND SUMMARY SSgA INTERMEDIATE FUND

Objective [Heading]

rr_ObjectiveHeading

INVESTMENT OBJECTIVE

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

SSgA Intermediate Fund seeks a high level of current income while preserving principal by investing primarily in a diversified portfolio of debt securities with a dollar-weighted average maturity between three and ten years.

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.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder Fees
     (fees paid directly from your investment)

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

December 31, 2013

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

PORTFOLIO TURNOVER

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The fund pays transaction costs, typically reflected in a bond’s purchase or sale price, 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 fund 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 turnover rate was 194% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

194.00%

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 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, that all dividends and distributions are reinvested, and that the fund’s operating expenses remain the same. The calculation of costs for the one-year period takes into account the effect of any current contractual fee waivers and/or reimbursements; and the calculation of costs for the remaining periods takes such fee waivers and/or reimbursements into account only for the first year of the periods. 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

SSgA Intermediate Fund attempts to meet its objective by investing at least 80% of its net assets (plus borrowings, if any) in debt instruments with dollar-weighted average maturities of between three and ten years. The fund’s portfolio typically consists of a core portfolio principally drawn from securities in the Barclays Capital U.S. Intermediate Government/Credit Bond Index, the fund’s benchmark, as well as other securities that have been selected to overweight or underweight certain securities, industries and sectors represented in the benchmark. The fund also manages its duration (that is, the sensitivity of the fund’s portfolio as a whole to interest rate changes) generally by investing in futures and primarily to correspond to the benchmark.

The fund invests primarily in investment grade debt instruments. Many of those instruments are instruments issued or guaranteed as to principal and interest by the U.S. government or its agencies and instrumentalities, obligations of U.S. and foreign corporations (e.g., “Yankee” bonds), including public utilities; obligations of U.S. and foreign financial institutions; repurchase agreements collateralized with high quality securities and other assets; derivatives, including swaps, futures and options; and asset-backed securities, including asset-backed commercial paper and mortgage-related securities. Such instruments typically are denominated in U.S. dollars. The fund may buy or sell securities on a forward-commitment, delayed-delivery or when-issued basis. These transactions involve the purchase or sale of securities by a fund at an established price with payment or delivery taking place in the future. The fund also may lend its securities, and it may invest in various fixed-income securities and money market funds, including money market funds advised by the fund’s investment advisor, in order to manage its cash. The fund also may engage in active trading, which could reduce the returns of fund shareholders investing through a taxable account, and the fund may take temporary defensive positions that are inconsistent with its principal investment strategies.

Risk [Heading]

rr_RiskHeading

PRINCIPAL RISKS

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

It is possible to lose money by investing in the fund. 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.

• Risks Common to Funds Investing Principally in Debt Instruments.

• Interest Rate Risk—The risk that interest rates will rise, causing the value of the fund’s assets to fall.

• Credit Risk—The risk that an issuer, guarantor or liquidity provider of an instrument held by the fund will fail to make scheduled interest or principal payments, which may reduce the fund’s income and the market value of the instrument.

• Prepayment Risk (when repayment of principal occurs before scheduled maturity) and Extension Risk (when rates of repayment of principal are slower than expected)—Applicable primarily to mortgage-related securities, the risks that the underlying loan obligations may be refinanced (repaid) faster or slower than expected, causing the fund to invest repayment proceeds in, or continue to hold, lower yielding securities, as the case may be.

• Liquidity Risk—The risk that the fund may not be able to sell some or all of its securities at desired prices or may be unable to sell the securities at all, because of a lack of demand in the market for such securities, or a liquidity provider defaults on its obligation to purchase the securities when properly tendered by the fund.

• Rapid Changes in Interest Rates. Rapid changes in interest rates may cause significant requests to redeem fund shares, and possibly cause the fund to sell portfolio securities at a loss to satisfy those requests.

• Significant Exposure to U.S. Government Agencies and Financial Institutions. Events that would adversely affect the market prices of securities issued or guaranteed by one government agency may adversely affect the market price of securities issued or guaranteed by other government agencies. Similarly, events that would affect the market value of instruments issued by one financial institution, including repurchase agreements, may adversely affect the market value of instruments issued by similarly situated financial institutions.

• Mortgage-Related and Other Asset-Backed Securities. Defaults on the underlying assets of the mortgage-related and other asset-backed securities held by the fund may impair the value of those securities, and there may be limitations on the enforceability of any security interest granted with respect to those assets. These securities also present a higher degree of prepayment risk and extension risk than do other types of fixed income securities.

• Foreign Securities. To the extent the fund holds securities of foreign issuers, financial information concerning those issuers may be unavailable or more limited than information generally available from U.S. issuers, and it may have difficulty selling the securities or protecting its investment. Foreign securities also tend to be adversely affected by local or regional political and economic developments. Most of the foreign securities held by the fund are “Yankee” bonds, that is, U.S. dollar-denominated foreign bonds. The value of non-U.S. dollar denominated foreign bonds in which the fund may invest also may be subject to changes in exchange rates.

• Derivatives. The fund’s investments in derivative instruments are subject to a number of risks, such as counterparty risk, the risk of mispricing or improper valuation, and the risk that the value of the instrument may not increase or decrease as expected.

• Forward-Commitment, When-Issued and Delayed-Delivery Securities. Forward-commitment, delayed-delivery and when-issued transactions involve a risk of loss if the value of the security to be purchased or sold by the fund increases or decreases below the repurchase price of those securities or the other party to the transaction fails to complete the transaction.

Please refer to “Fund Objectives, Strategies and Risks” in the Prospectus for further details.

Risk Lose Money [Text]

rr_RiskLoseMoney

It is possible to lose money by investing in the fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

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.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

PERFORMANCE

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following bar chart shows how the fund’s performance has varied from year to year, and the table immediately below the chart shows the performance of the fund over the past 1-, 5- and 10-year periods, and over the life of the fund, and compares the fund’s performance to the performance of a broad-based securities market index. The bar chart and the table provide some indication of the risks of investing in the fund. Index returns do not reflect deductions for fees, taxes or expenses associated with investment in a fund. A fund’s past performance (both before and after taxes) is not necessarily an indication of how the fund will perform in the future. Current performance information for the fund is available toll free by calling (800) 647-7327 or by visiting our website at www.ssgafunds.com.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The following bar chart shows how the fund’s performance has varied from year to year, and the table immediately below the chart shows the performance of the fund over the past 1-, 5- and 10-year periods, and over the life of the fund, and compares the fund’s performance to the performance of a broad-based securities market index.

Performance Availability Phone [Text]

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(800) 647-7327

Performance Availability Website Address [Text]

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www.ssgafunds.com

Performance Past Does Not Indicate Future [Text]

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A fund’s past performance (both 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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Annual Total Returns - SSgA Intermediate Fund

Bar Chart Closing [Text Block]

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Highest Quarterly Results (2002-2011)	Lowest Quarterly Results (2002-2011)	Year-to- Date Ended
September 30, 2002: 4.54%	September 30, 2007: (2.96)%	September 30, 2012: 3.66%

Performance Table Heading

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Average Annual Total Returns
For the Periods Ending December 31, 2011:

Index No Deduction for Fees, Expenses, Taxes [Text]

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Index returns do not reflect deductions for fees, taxes or expenses associated with investment in a fund.

Performance Table Uses Highest Federal Rate

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After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

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After-tax returns depend on an investor’s tax situation and may differ from those shown, and after-tax returns are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts (IRAs).

Performance Table Narrative

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

SSgA Intermediate Fund | Institutional

Risk/Return:

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Shareholder Fees (fees paid directly from your investment)

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none

Management Fee

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0.30%

Distribution and Shareholder Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.24%

Other Expenses

rr_OtherExpensesOverAssets

0.58%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.12%

Less Fee Waivers and/or Expense Reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.52%)

^[1]

Total Annual Fund Operating Expenses After Fee Waivers and Expense Reimbursements

rr_NetExpensesOverAssets

0.60%

^[1]

1 year

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61

3 years

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304

5 years

rr_ExpenseExampleYear05

567

10 years

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1,317

2002

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8.65%

2003

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3.71%

2004

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2.96%

2005

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0.85%

2006

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3.68%

2007

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(5.17%)

2008

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(0.68%)

2009

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7.62%

2010

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6.00%

2011

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4.84%

Year to Date Return, Label

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Year-to-Date Ended

Bar Chart, Year to Date Return, Date

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Sep. 30, 2012

Bar Chart, Year to Date Return

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3.66%

Highest Quarterly Return, Label

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Highest QuarterlyResults

Highest Quarterly Return, Date

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Sep. 30, 2002

Highest Quarterly Return

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4.54%

Lowest Quarterly Return, Label

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Lowest QuarterlyResults

Lowest Quarterly Return, Date

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Sep. 30, 2007

Lowest Quarterly Return

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(2.96%)

1 Year

rr_AverageAnnualReturnYear01

4.84%

^[2]

5 Years

rr_AverageAnnualReturnYear05

2.41%

^[2]

10 Years

rr_AverageAnnualReturnYear10

3.17%

^[2]

SSgA Intermediate Fund | Return After Taxes on Distributions | Institutional

Risk/Return:

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1 Year

rr_AverageAnnualReturnYear01

4.05%

^[2]

5 Years

rr_AverageAnnualReturnYear05

1.24%

^[2]

10 Years

rr_AverageAnnualReturnYear10

1.83%

^[2]

SSgA Intermediate Fund | Return After Taxes on Distributions and Sale of Fund Shares | Institutional

Risk/Return:

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1 Year

rr_AverageAnnualReturnYear01

3.14%

^[2]

5 Years

rr_AverageAnnualReturnYear05

1.36%

^[2]

10 Years

rr_AverageAnnualReturnYear10

1.92%

^[2]

SSgA Intermediate Fund | Barclays Capital U.S. Intermediate Government/Credit Bond Index (reflects no deduction for fees, expenses or taxes)

Risk/Return:

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1 Year

rr_AverageAnnualReturnYear01

5.80%

^[2]

5 Years

rr_AverageAnnualReturnYear05

5.88%

^[2]

10 Years

rr_AverageAnnualReturnYear10

5.20%

^[2]

[1] The fund's investment advisor is contractually obligated until December 31, 2013 to waive its management fee and to reimburse the fund for expenses to the extent that total expenses (exclusive of non-recurring account fees, extraordinary expenses and acquired fund fees) exceed 0.60% of average daily net assets on an annual basis. This waiver and reimbursement may not be terminated during the relevant period except with Board approval.

[2] The returns would have been lower without the contractual fee waiver and/or expense reimbursement.

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Select Class Shares | SSgA Emerging Markets Fund

FUND SUMMARY SSgA EMERGING MARKETS FUND

INVESTMENT OBJECTIVE

SSgA Emerging Markets Fund seeks to provide maximum total return, primarily through capital appreciation, by investing primarily in securities of foreign issuers.

FEES AND EXPENSES OF THE FUND

This table describes the fees and expenses that you may pay if you buy and hold shares of the fund.

Shareholder Fees (USD $)	Select Class Shares SSgA Emerging Markets Fund Select Class
Shareholder Fees (fees paid directly from your investment)	none

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

Annual Fund Operating Expenses	Select Class Shares SSgA Emerging Markets Fund Select Class
Management Fee	0.75%
Distribution and Shareholder Service (12b-1) Fees	0.03%
Other Expenses	0.27%
Total Annual Fund Operating Expenses	1.05%

EXAMPLE

This example is intended to help you compare the cost of investing in Select Class Shares of the fund with the cost of investing in other mutual funds.

The example assumes that you invest $10,000 in Select Class Shares of the fund for the time periods indicated, and then redeem all of your Select Class Shares of the fund at the end of those periods. The example also assumes that your investment has a 5% return each year, that all dividends and distributions are reinvested, and that the fund’s operating expenses remain the same. The calculation of costs for the one year period takes into account the effect of any current contractual fee waivers and/or reimbursements. The calculation of costs for the remaining periods takes such fee waivers and/or reimbursements into account only for the first year of the periods. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:

Expense Example (USD $)	1 year	3 years	5 years	10 years
Select Class Shares SSgA Emerging Markets Fund Select Class	107	334	579	1,283

PORTFOLIO TURNOVER

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 fund 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 turnover rate was 74% of the average value of its portfolio.

PRINCIPAL INVESTMENT STRATEGIES

The fund will invest at least 80% of its net assets (plus borrowings, if any) in equity securities issued by companies domiciled or doing a substantial portion of their business in countries determined by the fund’s advisor to have a developing or emerging economy or securities market. An emerging market is any market included in the MSCI Emerging Markets Index, the fund’s benchmark.

The fund’s advisor employs a proprietary quantitative model to assist in country and stock selection, which the advisor believes are the keys to achieving the fund’s objective. This model is intended to help determine the relative attractiveness of the countries and securities within the fund’s investment universe. In addition, the model assists the advisor in controlling the fund’s exposure to risks relative to the fund’s benchmark. The model is based on the historical relationships of certain economic and financial factors applicable to issuers and/or countries (such as measures of value, sentiment and share price momentum) to past performance. It allows the advisor to evaluate quickly each eligible security and then rank all eligible securities in the fund’s investment universe in the order of their attractiveness as fund investments. The advisor regularly reexamines the model and, when necessary, makes updates or adjustments to the economic and financial factors considered. The fund periodically rebalances its portfolio to reflect movements in the underlying factors. From time to time, the advisor will make a qualitative judgment to deviate from the model, but only if it believes that certain current information is not fully reflected in the model.

The fund may invest in common and preferred equity securities, publicly traded in the U.S. or in foreign countries in developed or emerging markets, securities convertible into common stocks, initial public offerings, equity swaps, equity futures, currency forwards, index swaps, structured equity notes, equity linked notes, American Depository Receipts and participation certificates.

The fund may use futures, forwards, swaps and certain other instruments to seek to generate returns. The fund’s use of futures, forwards, swaps and certain other instruments provides financial leverage. Through the use of leverage, the fund’s total investment exposure could far exceed the value of its portfolio holdings and its investment returns could depend upon the performance of equities and currencies that the fund does not own.

The fund also may lend its securities, and it may invest in various fixed-income securities and money market funds, including money market funds advised by the fund’s investment advisor, in order to manage its cash. The fund may take temporary defensive positions that are inconsistent with its principal investment strategies.

PRINCIPAL RISKS

It is possible to lose money by investing in the fund. 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.

Investing in this fund may involve more risk, and consequently, the fund may have a more volatile share price, than a fund investing primarily in equity securities of large, established U.S. corporations.

• Risks Common to Funds Investing Principally in Equity Securities.

• Market, Industry and Specific Holdings — The share price of the fund may fall because of weakness in the stock markets, generally, weaknesses with respect to a particular industry in which the fund has significant holdings, or weaknesses associated with one or more specific companies in which the fund may have substantial investments.

• Liquidity Risk — The risk that the fund may not be able to sell some or all of its securities at desired prices or may be unable to sell the securities at all.

• Use of a Quantitative Strategy. A quantitative investment strategy generally is based on the assumption that the future performance of a specific security relative to other securities may be predicted based on the correlation of certain historical economic and financial factors to past performance. Over time, the correlation between these factors and performance may diminish, which may impair the fund’s ability to achieve its investment objective.

• Foreign Securities, including Emerging Market Securities. To the extent the fund holds securities of foreign issuers, financial information concerning those issuers may be unavailable or more limited than information generally available from U.S. issuers, and it may have difficulty selling the securities or protecting its investment. Foreign securities also tend to be adversely affected by local or regional political and economic developments, as well as changes in exchange rates, and the inconvertibility of local currency into U.S. dollars. For emerging market equity securities, these risks tend to be greater than for securities of issuers located in more developed countries.

• Sector. The fund may have significant investments in one or more specific industry sectors, subjecting it to risks greater than general market risk.

• American Depositary Receipts (ADRs) and Global Depositary Receipts (GDRs). ADRs and GDRs held by the fund have the same currency and economic risks as the underlying shares they represent, as well as the risks associated with foreign securities.

• Derivatives. Investments in a derivative instrument could lose more than the principal amount invested. Compared to conventional securities, derivatives can be more sensitive to changes in interest rates or to sudden fluctuations in market prices and thus a fund’s losses may be greater if it invests in derivatives than if it invests only in conventional securities. The use of derivative instruments involves risks different from, or possibly greater than, the risks associated with investing directly in equity or fixed income securities, currencies or other investments. Derivatives are subject to a number of risks such as liquidity risk, market risk, credit risk, default risk, counterparty risk and management risk. They also involve the risk of mispricing or improper valuation and the risk that changes in the value of the derivative may not correlate exactly with the change in the value of the underlying asset, rate or index.

• Futures Risk. The risk of loss in trading futures contracts in some strategies is potentially unlimited. The entire amount invested in futures contracts could be lost. There also is no assurance that a liquid secondary market will exist for futures contracts and options in which a fund may invest. Participation in the futures markets, as well as the use of various forward contracts, involves investment risks and transaction costs to which the fund would not be subject absent the use of these strategies. If the fund’s predictions of movements in the direction of the securities, fixed income or currencies markets are inaccurate, the adverse consequences to the fund may leave the fund in a worse position than if such strategies were not used.

• Forward Currency Contracts. The fund may engage in forward currency contracts to hedge against uncertainty in the level of future exchange rates or to effect investment transactions to generate returns consistent with the fund’s investment objective and strategies. A forward contract involves an obligation to purchase or sell a specific currency. Forward currency contracts are subject to the risk that should forward prices increase, a loss will be incurred to the extent that the price of the currency agreed to be purchased exceeds the price of the currency agreed to be sold.

• Swaps. A swap is a two-party contract that generally obligates one party to pay the positive return and the other party to pay the negative return on a specified reference security, basket of securities, security index or index component. Swaps can involve greater risks than direct investment in securities, because swaps may be leveraged and are subject to counterparty risk (e.g., the risk of a counterparty’s defaulting on the obligation or bankruptcy), credit risk and pricing risk (i.e., swaps may be difficult to value). Swaps may also be considered illiquid. It may not be possible for the Fund to liquidate a swap position at an advantageous time or price, which may result in significant losses.

• Participation Certificates. Participation certificates are issued by banks or broker-dealers and are designed to offer a return linked to a security, index of securities or other asset. Investments in participation certificates involve the same risks associated with a direct investment in the underlying foreign companies or foreign securities markets that they seek to replicate and are subject to counterparty risk.

Please refer to “Fund Objectives, Strategies and Risks” in the Prospectus for further details.

PERFORMANCE

The following bar chart shows how the performance fund’s Select Class Shares has varied from year to year, and the table immediately below the chart shows the performance of the fund’s Select Class Shares over the past 1-, 5- and 10-year periods, and over the life of the fund, and compares the fund’s performance to the performance of a broad-based securities market index. Performance information for Select Class Shares before their inception (March 1, 2006) is derived from the historical performance of the fund’s Institutional Class Shares, adjusted for differences in the operating expenses of the two classes The bar chart and the table provide some indication of the risks of investing in the fund. Index returns do not reflect deductions for fees, taxes or expenses associated with investment in a fund. The fund’s past performance (both before and after taxes) is not necessarily an indication of how the fund will perform in the future. Current performance information for the fund is available toll free by calling (800) 647-7327 or by visiting our website at www.ssgafunds.com.

Annual Total Returns - SSgA Emerging Markets Fund

Highest Quarterly Results (2002-2011)	Lowest Quarterly Results (2002-2011)	Year-to- Date Ended
June 30, 2009: 31.35%	September 30, 2008: (29.88)%	September 30, 2012: 9.26%

Average Annual Total Returns For the Periods Ending December 31, 2011:

Average Annual Total Returns Select Class Shares		1 Year	5 Years		10 Years
SSgA Emerging Markets Fund	[1]	(18.83%)	0.52%	[2]	13.13%	[2]
SSgA Emerging Markets Fund Return After Taxes on Distributions	[1]	(19.35%)	(0.37%)	[2]	12.36%	[2]
SSgA Emerging Markets Fund Return After Taxes on Distributions and Sale of Fund Shares	[1]	(12.24%)	0.36%	[2]	11.80%	[2]
SSgA Emerging Markets Fund MSCI® Emerging Markets Index (Gross) (reflects no deduction for fees, expenses or taxes)		(18.17%)	2.70%	[2]	14.20%	[2]
SSgA Emerging Markets Fund MSCI® Emerging Markets Index (Net) (reflects no deduction for fees, expenses or taxes)		(18.42%)	2.40%	[2]	13.86%	[2]

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

[1] The Select Class began operating on March 1, 2006. Performance for the fund's Select Class before inception is derived from the historical performance of the Institutional Class. The returns shown above do not reflect deduction of the lower distribution fees and shareholder services fees applicable to the Select Class. The returns of the Select Class would have been higher than the Institutional Class due to the lower distribution and shareholder servicing fees.

[2] The returns would have been lower without the contractual fee waiver and/or expense reimbursement.

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SSgA IAM SHARES Fund

FUND SUMMARY SSgA IAM SHARES FUND

INVESTMENT OBJECTIVE

SSgA IAM SHARES Fund seeks to maximize total return primarily through investments in equity securities of companies that have entered into collective bargaining agreements with the International Association of Machinists and Aerospace Workers (“IAMAW”) or affiliated labor unions or have not been identified as having non-union sentiment.

FEES AND EXPENSES OF THE FUND

This table describes the fees and expenses that you may pay if you buy and hold shares of the fund.

Shareholder Fees (USD $)	SSgA IAM SHARES Fund Institutional
Shareholder Fees (fees paid directly from your investment)	none

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

Annual Fund Operating Expenses		SSgA IAM SHARES Fund Institutional
Management Fee		0.25%
Distribution and Shareholder Service (12b-1) Fees		0.06%
Other Expenses		0.20%
Total Annual Fund Operating Expenses		0.51%
Less Fee Waivers and/or Expense Reimbursements	[1]	none
Total Annual Fund Operating Expenses After Fee Waivers and Expense Reimbursements		0.51%

EXAMPLE

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, that all dividends and distributions are reinvested, and that the fund’s operating expenses remain the same. The calculation of costs for the one-year period takes into account the effect of any current contractual fee waivers and/or reimbursements; and the calculation of costs for the remaining periods takes such fee waivers and/or reimbursements into account only for the first year of the periods. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:

Expense Example (USD $)	1 year	3 years	5 years	10 years
SSgA IAM SHARES Fund Institutional	51	160	280	628

PORTFOLIO TURNOVER

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 fund 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 turnover rate was less than 3% of the average value of its portfolio.

PRINCIPAL INVESTMENT STRATEGIES

SSgA IAM SHARES Fund will invest at least 80% of its net assets (plus borrowings, if any) in equity securities of companies (“IAM Companies”) that:

• Have entered into collective bargaining agreements with the IAMAW or affiliated labor unions, or
• Are listed in the S&P 500® Index, and have not been identified by the IAMAW or affiliated labor unions as having non-union sentiment.

The fund may invest up to 20% of its assets in securities of non-IAM Companies that have not been deemed to have non-union sentiment by the IAMAW.

The fund’s investment strategy is driven by a quantitative investment process that manages portfolio exposure to fundamental attributes in a multifactor risk model environment. These attributes include industry allocations as well as factors such as size, style, growth expectations and valuation ratios. This model attempts to create a portfolio reflecting risk and return characteristics similar to those of the S&P 500 Index.

IAM Companies are diverse both geographically and by industry. The portfolio management team will rebalance the fund periodically in order to maintain its relative exposure to IAM Companies, as well as to account for any changes to the universe of IAM Companies. While the fund seeks a high correlation with the S&P 500 Index returns, the fund will not fully replicate the S&P 500 Index; therefore, the fund’s returns will likely vary from those of the S&P 500 Index.

The fund attempts to meet its investment objective by investing primarily in, among other things, domestic common stocks and related securities, which may include securities convertible into common stocks of domestic companies and IPOs. The fund also may lend its securities, and it may invest in various fixed-income securities and money market funds, including money market funds advised by the fund’s investment advisor, in order to manage its cash. The fund may take temporary defensive positions that are inconsistent with its principal investment strategies.

PRINCIPAL RISKS

It is possible to lose money by investing in the fund. 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.

• Risks Common to Funds Investing Principally in Equity Securities.

• Market, Industry and Specific Holdings—The share price of the fund may fall because of weakness in the stock markets, generally, weaknesses with respect to a particular industry in which the fund has significant holdings, or weaknesses associated with one or more specific companies in which the fund may have substantial investments.

• Liquidity Risk—The risk that the fund may not be able to sell some or all of its securities at desired prices or may be unable to sell the securities at all.

• Use of a Quantitative Strategy. A quantitative investment strategy generally is based on the assumption that the future performance of a specific security relative to other securities may be predicted based on the correlation of certain historical economic and financial factors to past performance. Over time, the correlation between these factors and performance may diminish, which may impair the fund’s ability to achieve its investment objective.

• Large-Capitalization Securities. Large-capitalization companies usually cannot respond as quickly as smaller companies to competitive challenges, and their growth rates tend to lag the growth rates of well-managed smaller companies during strong economic periods.

• More Volatility than the Fund’s Benchmark. While presenting the opportunity for excess returns relative to the S&P 500 Index, the fund’s strategy may present a greater risk of loss and higher tracking error compared to a fund that follows a strict indexing strategy.

• Derivatives. The fund’s investments in derivative instruments are subject to a number of risks, such as counterparty risk, the risk of mispricing or improper valuation, and the risk that the value of the instrument may not increase or decrease as expected.

• Sector. The fund may have significant investments in one or more specific industry sectors, subjecting it to risks greater than general market risk.

Please refer to “Fund Objectives, Strategies and Risks” in the Prospectus for further details.

PERFORMANCE

The following bar chart shows how the fund’s performance has varied from year to year, and the table immediately below the chart shows the performance of the fund over the past 1-, 5- and 10-year periods, and over the life of the fund, and compares the fund’s performance to the performance of a broad-based securities market index. The bar chart and the table provide some indication of the risks of investing in the fund. Index returns do not reflect deductions for fees, taxes or expenses associated with investment in a fund. A fund’s past performance (both before and after taxes) is not necessarily an indication of how the fund will perform in the future. Current performance information for the fund is available toll free by calling (800) 647-7327 or by visiting our website at www.ssgafunds.com.

Annual Total Returns - SSgA Iam Shares Fund

Highest Quarterly Results (2002-2011)	Lowest Quarterly Results (2002-2011)	Year-to- Date Ended
June 30, 2009: 16.46%	December 31, 2008: (22.24)%	September 30, 2012: 15.94%

Average Annual Total Returns
For the Periods Ending December 31, 2011:

Average Annual Total Returns SSgA IAM SHARES Fund	1 Year	5 Years	10 Years
Institutional	1.81%	(0.42%)	2.48%	[1]
Institutional Return After Taxes on Distributions	1.25%	(0.77%)	2.17%	[1]
Institutional Return After Taxes on Distributions and Sale of Fund Shares	1.17%	(0.46%)	2.04%	[1]
S&P 500® Index (reflects no deduction for fees, expenses or taxes)	2.11%	(0.25%)	2.92%	[1]

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

[1] The fund's investment advisor is contractually obligated until December 31, 2013 to waive its management fee and to reimburse the fund for expenses to the extent that total expenses (exclusive of non-recurring account fees, extraordinary expenses and acquired fund fees) exceed 0.65% of average daily net assets on an annual basis. This waiver and reimbursement may not be terminated during the relevant period except with Board approval.

[1] The returns would have been lower without the contractual fee waiver and/or expense reimbursement.

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SSgA High Yield Bond Fund

FUND SUMMARY SSgA HIGH YIELD BOND FUND

INVESTMENT OBJECTIVE

SSgA High Yield Bond Fund seeks to maximize total return by investing primarily in fixed-income securities, including, but not limited to, those represented by the Barclays Capital U.S. Corporate High-Yield Bond Index.

FEES AND EXPENSES OF THE FUND

This table describes the fees and expenses that you may pay if you buy and hold shares of the fund.

Shareholder Fees (USD $)	SSgA High Yield Bond Fund Institutional
Shareholder Fees (fees paid directly from your investment)	none

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

Annual Fund Operating Expenses		SSgA High Yield Bond Fund Institutional
Management Fee		0.30%
Distribution and Shareholder Service (12b-1) Fees		0.24%
Other Expenses		0.34%
Acquired Fund Fee and Expenses (fees and expenses incurred indirectly by the fund as a result of an investment in shares of one or more acquired funds)		0.02%
Total Annual Fund Operating Expenses		0.90%
Less Fee Waivers and/or Expense Reimbursements	[1]	(0.13%)
Total Annual Fund Operating Expenses After Fee Waivers and Expense Reimbursements	[1]	0.77%

EXAMPLE

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, that all dividends and distributions are reinvested, and that the fund’s operating expenses remain the same. The calculation of costs for the one-year period takes into account the effect of any current contractual fee waivers and/or reimbursements; and the calculation of costs for the remaining periods takes such fee waivers and/or reimbursements into account only for the first year of the periods. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:

Expense Example (USD $)	1 year	3 years	5 years	10 years
SSgA High Yield Bond Fund Institutional	79	274	486	1,096

PORTFOLIO TURNOVER

The fund pays transaction costs, typically reflected in a bond’s purchase or sale price, 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 fund 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 turnover rate was 196% of the average value of its portfolio.

PRINCIPAL INVESTMENT STRATEGIES

SSgA High Yield Bond Fund attempts to meet its objective by investing at least 80% of its net assets (plus borrowings, if any) in high yield bonds commonly referred to as “junk bonds”. The fund’s portfolio typically consists of a core portfolio principally drawn from securities in the Barclays Capital U.S. High-Yield 2% Issuer Capped Index, the fund’s benchmark, as well as other securities that have been selected to overweight or underweight certain securities, industries and sectors represented in the benchmark. Intensive credit analysis of specific issuers is an important component of the fund’s securities selection process. High yield bonds, and to a lesser extent other types of bonds, may be purchased at a discount to their face value and thereby provide opportunities to the fund for capital appreciation. The duration of the fund (that is, its sensitivity to changes in interest rates) is monitored against the benchmark.

The fund invests primarily in debt securities that have been publicly issued or privately placed, with fixed, zero coupon, payment-in-kind, variable or floating interest rates. The fund’s investments may include: obligations of U.S. and foreign corporations (e.g., “Yankee” bonds); privately issued bank loans; equity securities; derivatives (e.g., credit default swap indices); asset-backed securities; and repurchase agreements. The fund also may lend its securities, and it may invest in various fixed-income securities and money market funds, including money market funds advised by the fund’s investment advisor, in order to manage its cash. The fund also may engage in active trading, which could reduce the returns of fund shareholders investing through a taxable account, and the fund may take temporary defensive positions that are inconsistent with its principal investment strategies.

PRINCIPAL RISKS

It is possible to lose money by investing in the fund. 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.

• Risks Common to Funds Investing Principally in Debt Instruments.

• Interest Rate Risk—The risk that interest rates will rise, causing the value of the fund’s assets to fall.

• Credit Risk—The risk that an issuer, guarantor or liquidity provider of an instrument held by the fund will fail to make scheduled interest or principal payments, which may reduce the fund’s income and the market value of the instrument.

• Prepayment Risk (when repayment of principal occurs before scheduled maturity) and Extension Risk (when rates of repayment of principal are slower than expected)—Applicable primarily to mortgage-related securities, the risks that the underlying loan obligations may be refinanced (repaid) faster or slower than expected, causing the fund to invest repayment proceeds in, or continue to hold, lower yielding securities, as the case may be.

• Liquidity Risk—The risk that the fund may not be able to sell some or all of its securities at desired prices or may be unable to sell the securities at all, because of a lack of demand in the market for such securities, or a liquidity provider defaults on its obligation to purchase the securities when properly tendered by the fund.

• Non-Investment Grade Securities. Securities rated below investment grade (that is, below BBB by S&P or Baa by Moody’s) are regarded as predominantly speculative with respect to capacity to pay interest and repay principal in accordance with the terms of the obligation. High yield bonds generally are not as sensitive to interest rate changes as investment grade bonds.

• Rapid Changes in Interest Rates. Rapid changes in interest rates may cause significant requests to redeem fund shares, and possibly cause the fund to sell portfolio securities at a loss to satisfy those requests.

• Privately Negotiated Loans and Other Indebtedness. The fund may acquire interests in certain corporate loans and other forms of indebtedness that restrict the fund’s ability to sell those interests. As a result, the fund may not be able to sell those interests, or sell those interests for full value, when it otherwise may be advantageous to the fund to do so.

• Asset-Backed Securities. Defaults on the underlying assets of the asset-backed securities held by the fund may impair the value of an asset-backed security, and there may be limitations on the enforceability of any security interest granted with respect to those assets.

• Foreign Securities. To the extent the fund holds securities of foreign issuers, financial information concerning those issuers may be unavailable or more limited than information generally available from U.S. issuers, and it may have difficulty selling the securities or protecting its investment. Foreign securities also tend to be adversely affected by local or regional political and economic developments. Most of the foreign securities held by the fund are “Yankee” bonds, that is, U.S. dollar-denominated foreign bonds. The value of non-U.S. dollar denominated foreign bonds in which the fund may invest also may be subject to changes in exchange rates.

• Equities. To the extent the fund holds equities, the fund will be exposed to the risks inherent in equities. The share price of the fund may fall because of weakness in the stock markets, generally, weakness with respect to a particular industry in which it has significant holdings, or weakness associated with one or more specific companies in which the fund may have substantial investments. Moreover, the fund may not be able to sell some or all of its securities at desired prices.

• Derivatives. The fund’s investments in derivative instruments are subject to a number of risks, such as counterparty risk, the risk of mispricing or improper valuation, and the risk that the value of the instrument may not increase or decrease as expected.

Please refer to “Fund Objectives, Strategies and Risks” in the Prospectus for further details.

PERFORMANCE

The following bar chart shows how the fund’s performance has varied from year to year, and the table immediately below the chart shows the performance of the fund over the past 1-, 5- and 10-year periods, and over the life of the fund, and compares the fund’s performance to the performance of a broad-based securities market index. The bar chart and the table provide some indication of the risks of investing in the fund. Index returns do not reflect deductions for fees, taxes or expenses associated with investment in a fund. A fund’s past performance (both before and after taxes) is not necessarily an indication of how the fund will perform in the future. Current performance information for the fund is available toll free by calling (800) 647-7327 or by visiting our website at www.ssgafunds.com.

Annual Total Returns - SSgA High Yield Bond Fund

Highest Quarterly Results (2002-2011)	Lowest Quarterly Results (2002-2011)	Year-to- Date Ended
June 30, 2009: 16.46%	December 31, 2008: (17.13)%	September 30, 2012: 11.42%

Average Annual Total Returns
For the Periods Ending December 31, 2011:

Average Annual Total Returns SSgA High Yield Bond Fund		1 Year	5 Years	10 Years
Institutional	[1]	3.63%	7.20%	7.63%
Institutional Return After Taxes on Distributions	[1]	1.24%	4.16%	4.74%
Institutional Return After Taxes on Distributions and Sale of Fund Shares	[1]	2.35%	4.29%	4.78%
Barclays Capital U.S. High-Yield 2% Issuer Capped Index (reflects no deduction for fees, expenses or taxes)	[1]	4.96%	7.74%	8.96%

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

[1] The fund's investment advisor is contractually obligated until December 31, 2013 to waive its management fee and to reimburse the fund for expenses to the extent that total expenses (exclusive of non-recurring account fees, extraordinary expenses, and acquired fund fees) exceed 0.75% of average daily net assets on an annual basis. This waiver and reimbursement may not be terminated during the relevant period except with Board approval.

[1] The returns would have been lower without the contractual fee waiver and/or expense reimbursement.

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

SSGA FUNDS

Prospectus Date

rr_ProspectusDate

Dec. 14, 2012

SSgA Money Market Fund

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

FUND SUMMARY SSgA MONEY MARKET FUND

Objective [Heading]

rr_ObjectiveHeading

INVESTMENT OBJECTIVE

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

SSgA Money Market Fund seeks to maximize current income, to the extent consistent with the preservation of capital and liquidity and the maintenance of a stable $1.00 per share net asset value, by investing in dollar-denominated securities.

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.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder Fees
     (fees paid directly from your investment)

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

December 31, 2013

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 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, that all dividends and distributions are reinvested, and that the fund’s operating expenses remain the same. The calculation of costs for the one-year period takes into account the effect of any current contractual fee waivers and/or reimbursements; and the calculation of costs for the remaining periods takes such fee waivers and/or reimbursements into account only for the first year of the periods. 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

SSgA Money Market Fund follows a disciplined investment process that attempts to provide stability of principal, liquidity and current income through all market conditions by investing in high quality money market instruments. The fund invests in accordance with regulatory requirements applicable to money market funds, which impose strict conditions on the quality of portfolio securities, liquidity of portfolio holdings, the maturity of individual securities and the portfolio as a whole, and portfolio diversification.

The fund attempts to meet its investment objective by investing in a broad range of money market instruments, including certificates of deposit, bank notes and other bank instruments, commercial paper, repurchase agreements, asset-backed securities, corporate obligations, instruments issued or guaranteed by the U.S. government, its agencies and sponsored entities. These instruments may bear fixed, variable or floating rates of interest or may be zero coupon securities.

Risk [Heading]

rr_RiskHeading

PRINCIPAL RISKS

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Although the fund seeks to preserve the value of your investment at $1.00 per share, it is possible to lose money by investing in the fund.

• Risks Common to Funds Investing Principally in Debt Instruments.

• Interest Rate Risk—The risk that interest rates will rise, causing the value of the fund’s assets to fall.

• Credit Risk—The risk that an issuer, guarantor or liquidity provider of an instrument held by the fund will fail to make scheduled interest or principal payments, which may reduce the fund’s income and the market value of the instrument.

• Prepayment Risk (when repayment of principal occurs before scheduled maturity) and Extension Risk (when rates of repayment of principal are slower than expected)—Applicable primarily to mortgage-related securities, the risks that the underlying loan obligations may be refinanced (repaid) faster or slower than expected, causing the fund to invest repayment proceeds in, or continue to hold, lower yielding securities, as the case may be.

• Liquidity Risk—The risk that the fund may not be able to sell some or all of its securities at desired prices or may be unable to sell the securities at all, because of a lack of demand in the market for such securities, or a liquidity provider defaults on its obligation to purchase the securities when properly tendered by the fund.

• Risk Associated with Maintaining a Stable Share Price. To the extent that the aggregate market value of the fund’s assets materially varies from the aggregate of the acquisition prices of those assets, the fund may not be able to maintain a stable share price of $1.00. This risk typically is higher during periods of rapidly changing interest rates or when issuer credit quality generally is falling, and is made worse when the fund experiences significant redemption requests.

• Rapid Changes in Interest Rates. Rapid changes in interest rates may cause significant requests to redeem fund shares, and possibly cause the fund to sell portfolio securities at a loss to satisfy those requests.

• Low Short-Term Interest Rates. As short-term interest rates approach 0%, the fund may maintain substantial cash balances. The fund typically does not receive any income from uninvested cash. In addition, if the fund generates insufficient income to pay its expenses, it may not pay a daily dividend.

• Concentrated Exposure to Financial Institutions. Many instruments in which the fund invests, including repurchase agreements, are issued or guaranteed by financial institutions, such as banks and brokers, or are collateralized by securities issued or guaranteed by financial institutions. Changes in the credit worthiness of any of these institutions may adversely affect the value of instruments held by the fund.

• Foreign Securities. The fund may invest in U.S. dollar denominated instruments issued by foreign governments, corporations and financial institutions. Financial information relating to foreign issuers may be more limited than financial information generally available for domestic issuers. In addition, the value of instruments of foreign issuers may be adversely affected by local or regional political and economic developments.

Please refer to “Fund Objectives, Strategies and Risks” in the Prospectus for further details.

Risk Money Market Fund [Text]

rr_RiskMoneyMarketFund

Although the fund seeks to preserve the value of your investment at $1.00 per share, it is possible to lose money by investing in the fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

PERFORMANCE

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following bar chart shows how the fund’s performance has varied from year to year, and the table immediately below the chart shows the performance of the fund over the past 1-, 5- and 10-year periods, and over the life of the fund. The bar chart and the table provide some indication of the risks of investing in the fund. A fund’s past performance (both before and after taxes) is not necessarily an indication of how the fund will perform in the future. Current performance information for the fund is available toll free by calling (800) 647-7327 or by visiting our website at www.ssgafunds.com.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The following bar chart shows how the fund’s performance has varied from year to year, and the table immediately below the chart shows the performance of the fund over the past 1-, 5- and 10-year periods, and over the life of the fund.

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

(800) 647-7327

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.ssgafunds.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

A fund’s past performance (both before and after taxes) is not necessarily an indication of how the fund will perform in the future.

Bar Chart [Heading]

rr_BarChartHeading

Annual Total Returns - SSgA Money Market Fund

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

Highest Quarterly Results (2002-2011)	Lowest Quarterly Results (2002-2011)	Year-to- Date Ended
September 30, 2007: 1.26%	December 31, 2011: 0.00%	September 30, 2012: 0.01%

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns
for the Periods Ending December 31, 2011:

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

To obtain the fund’s current yield, please call (800) 997-7327.

Money Market Seven Day Yield, Caption [Text]

rr_MoneyMarketSevenDayYieldCaption

To obtain the fund’s current yield

Money Market Seven Day Yield Phone

rr_MoneyMarketSevenDayYieldPhone

(800) 997-7327

SSgA Money Market Fund | Institutional

Risk/Return:

rr_RiskReturnAbstract

Shareholder Fees (fees paid directly from your investment)

rr_ShareholderFeeOther

none

Management Fee

rr_ManagementFeesOverAssets

0.25%

Distribution and Shareholder Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.08%

Other Expenses

rr_OtherExpensesOverAssets

0.06%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.39%

Less Fee Waivers and/or Expense Reimbursements

rr_FeeWaiverOrReimbursementOverAssets

none

^[1]

Total Annual Fund Operating Expenses After Fee Waivers and Expense Reimbursements

rr_NetExpensesOverAssets

0.39%

1 year

rr_ExpenseExampleYear01

40

3 years

rr_ExpenseExampleYear03

125

5 years

rr_ExpenseExampleYear05

219

10 years

rr_ExpenseExampleYear10

493

2002

rr_AnnualReturn2002

1.57%

2003

rr_AnnualReturn2003

0.84%

2004

rr_AnnualReturn2004

1.01%

2005

rr_AnnualReturn2005

2.92%

2006

rr_AnnualReturn2006

4.76%

2007

rr_AnnualReturn2007

5.00%

2008

rr_AnnualReturn2008

2.46%

2009

rr_AnnualReturn2009

0.28%

2010

rr_AnnualReturn2010

0.01%

2011

rr_AnnualReturn2011

0.01%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to- Date Ended

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Sep. 30, 2012

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

0.01%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarterly Results (2002-2011)

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Sep. 30, 2007

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

1.26%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarterly Results (2002-2011)

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2011

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

0.00%

1 Year

rr_AverageAnnualReturnYear01

0.01%

^[2]

5 Years

rr_AverageAnnualReturnYear05

1.53%

^[2]

10 Years

rr_AverageAnnualReturnYear10

1.87%

^[2]

[1] The fund's investment advisor is contractually obligated until December 31, 2013 to waive its management fee and to reimburse the fund for all expenses to the extent that total expenses (exclusive of non-recurring account fees, extraordinary expenses and acquired fund fees) exceed 0.40% of average daily net assets on an annual basis. This waiver and reimbursement may not be terminated during the relevant period except with Board approval. Extraordinary expenses that are not subject to the foregoing contractual expense limitation agreement include, but are not limited to, any reimbursement payments made by the fund to the fund's investment advisor of fund fees and expenses that were previously waived or reimbursed by the fund's investment advisor in order to maintain a non-negative net yield for the fund. The fund's investment advisor may also reduce all or a portion of its fees and/or reimburse expenses of the fund to the extent necessary to maintain a minimum net yield for the fund (the "Voluntary Reduction") which may vary from time to time in the investment advisor's sole discretion. The fund has agreed, subject to certain limitations, to reimburse its investment advisor for the full dollar amount of any Voluntary Reduction incurred after August 1, 2012. As of August 1, 2012, the fund's investment advisor waived fees and/or reimbursed expenses in the amount of $685,760 under the voluntary yield waiver. Any future reimbursement of previously waived fees by the fund to its investment advisor may cause the total fund annual operating expenses of the fund to exceed the expense limitation under the contractual expense limitation agreement. The investment advisor may, in its sole discretion, irrevocably waive receipt of any or all reimbursement amounts due from the fund, without limitation.Total Annual Fund Operating Expenses may be higher than the fund's ratio of expenses to average net assets shown in the Financial Highlights, which reflect the operating expenses of the fund including voluntary waivers.

[2] The returns would have been lower without the contractual and voluntary management fee waiver and/or expense reimbursement.

XML

SSgA U.S. Treasury Money Market Fund

FUND SUMMARY SSgA U.S. Treasury Money Market Fund

INVESTMENT OBJECTIVE

SSgA U.S. Treasury Money Market Fund seeks to maximize current income, to the extent consistent with the preservation of capital and liquidity and the maintenance of a stable $1.00 per share net asset value, by investing in obligations that are issued or guaranteed as to principal and interest by the U.S. government and repurchase agreements backed by such securities.

FEES AND EXPENSES OF THE FUND

This table describes the fees and expenses that you may pay if you buy and hold shares of the fund.

Shareholder Fees (USD $)	SSgA U.S. Treasury Money Market Fund Institutional
Shareholder Fees (fees paid directly from your investment)	none

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

Annual Fund Operating Expenses		SSgA U.S. Treasury Money Market Fund Institutional
Management Fee		0.15%
Distribution and Shareholder Service (12b-1) Fees		0.05%
Other Expenses		0.05%
Total Annual Fund Operating Expenses		0.25%
Less Fee Waivers and/or Expense Reimbursements	[1]	(0.05%)
Total Annual Fund Operating Expenses After Fee Waivers and Expense Reimbursements	[1]	0.20%

EXAMPLE

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, that all dividends and distributions are reinvested, and that the fund’s operating expenses remain the same. The calculation of costs for the one-year period takes into account the effect of any current contractual fee waivers and/or reimbursements; and the calculation of costs for the remaining periods takes such fee waivers and/or reimbursements into account only for the first year of the periods. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:

Expense Example (USD $)	1 year	3 years	5 years	10 years
SSgA U.S. Treasury Money Market Fund Institutional	20	75	136	313

PRINCIPAL INVESTMENT STRATEGIES

SSgA U.S. Treasury Money Market Fund attempts to meet its investment objective by investing principally in U.S. Treasury bills, notes and bonds (which are direct obligations of the U.S. government) and repurchase agreements backed by such securities. The fund also may invest in shares of other money market funds, including funds advised by the fund’s investment advisor.

The fund follows a disciplined investment process in which the fund’s investment advisor bases its decisions on the relative attractiveness of different money market instruments. In the advisor’s opinion, the attractiveness of an instrument may vary depending on the general level of interest rates, as well as imbalances of supply and demand in the market. The fund invests in accordance with regulatory requirements applicable to money market funds, which impose strict conditions on the quality of portfolio securities, the maturity of individual securities and the portfolio as a whole, and portfolio diversification.

PRINCIPAL RISKS

An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Although the fund seeks to preserve the value of your investment at $1.00 per share, it is possible to lose money by investing in the fund.

• Risks Common to Funds Investing Principally in Debt Instruments.

• Interest Rate Risk—The risk that interest rates will rise, causing the value of the fund’s assets to fall.

• Credit Risk—The risk that an issuer, guarantor or liquidity provider of an instrument held by the fund will fail to make scheduled interest or principal payments, which may reduce the fund’s income and the market value of the instrument.

• Prepayment Risk (when repayment of principal occurs before scheduled maturity) and Extension Risk (when rates of repayment of principal are slower than expected)—Applicable primarily to mortgage-related securities, the risks that the underlying loan obligations may be refinanced (repaid) faster or slower than expected, causing the fund to invest repayment proceeds in, or continue to hold, lower yielding securities, as the case may be.

• Liquidity Risk—The risk that the fund may not be able to sell some or all of its securities at desired prices or may be unable to sell the securities at all, because of a lack of demand in the market for such securities, or a liquidity provider defaults on its obligation to purchase the securities when properly tendered by the fund.

• Risk Associated with Maintaining a Stable Share Price. To the extent that the aggregate market value of the fund’s assets materially varies from the aggregate of the acquisition prices of those assets, the fund may not be able to maintain a stable share price of $1.00. This risk typically is higher during periods of rapidly changing interest rates or when issuer credit quality generally is falling, and is made worse when the fund experiences significant redemption requests.

• Concentrated Exposure to Financial Institutions. Many instruments in which the fund invests, including repurchase agreements, are issued or guaranteed by financial institutions, such as banks and brokers, or are collateralized by securities issued or guaranteed by financial institutions. Changes in the credit worthiness of any of these institutions may adversely affect the value of instruments held by the fund.

• Rapid Changes in Interest Rates. Rapid changes in interest rates may cause significant requests to redeem fund shares, and possibly cause the fund to sell portfolio securities at a loss to satisfy those requests.

• Low Short-Term Interest Rates. As short-term interest rates approach 0%, the fund may maintain substantial cash balances. The fund typically does not receive any income from uninvested cash. In addition, if the fund generates insufficient income to pay its expenses, it may not pay a daily dividend.

Please refer to “Fund Objectives, Strategies and Risks” in the Prospectus for further details.

PERFORMANCE

The following bar chart shows how the fund’s performance has varied from year to year, and the table immediately below the chart shows the performance of the fund over the past 1-, 5- and 10-year periods, and over the life of the fund. The bar chart and the table provide some indication of the risks of investing in the fund. A fund’s past performance (both before and after taxes) is not necessarily an indication of how the fund will perform in the future. Current performance information for the fund is available toll free by calling (877) 521-4083 or by visiting our website at www.ssgafunds.com.

Annual Total Returns - SSgA U.S. Treasury Money Market Fund

Highest Quarterly Results (2002-2011)	Lowest Quarterly Results (2002-2011)	Year-to- Date Ended
December 31, 2006: 1.29%	December 31, 2011: 0.00%	September 30, 2012: 0.00%

Average Annual Total Returns For the Periods Ending December 31, 2011:

Average Annual Total Returns		1 Year	5 Years	10 Years
SSgA U.S. Treasury Money Market Fund Institutional	[1]	none	1.24%	1.77%

To obtain the fund’s current yield, please call (877) 521-4083.

[1] The fund's investment advisor is contractually obligated until December 31, 2013 to waive 0.05% of its 0.15% management fee. Additionally, the advisor is further contractually obligated until December 31, 2013 to waive its management fee and to reimburse the fund for all expenses to the extent that total expenses (exclusive of non-recurring account fees, extraordinary expenses and acquired fund fees) exceed 0.20% of average daily net assets on an annual basis. This waiver and reimbursement may not be terminated during the relevant period except with Board approval. Extraordinary expenses that are not subject to the foregoing contractual expense limitation agreement include, but are not limited to, any reimbursement payments made by the fund to the fund's investment advisor of fund fees and expenses that were previously waived or reimbursed by the fund's investment advisor in order to maintain to avoid a non-negative net yield for the fund. The fund's investment advisor may also reduce all or a portion of its fees and/or reimburse expenses of the fund to the extent necessary to maintain a minimum net yield for the fund (the “Voluntary Reduction”) which may vary from time to time in the investment advisor's sole discretion. The fund has agreed, subject to certain limitations, to reimburse its investment advisor for the full dollar amount of any Voluntary Reduction incurred after August 1, 2012. As of August 1, 2012, the fund's investment advisor waived fees and/or reimbursed expenses in the amount of $675,397 under the voluntary yield waiver. Any future reimbursement of previously waived fees by the fund to its investment advisor may cause the total fund annual operating expenses of the fund to exceed the expense limitation under the contractual expense limitation agreement. The investment advisor may, in its sole discretion, irrevocably waive receipt of any or all reimbursement amounts due from the fund, without limitation. Total Annual Fund Operating Expenses may be higher than the fund's ratio of expenses to average net assets shown in the Financial Highlights, which reflect the operating expenses of the fund including voluntary waivers.

[1] The returns would have been lower without the contractual and voluntary management fee waiver and/or expense reimbursement.

XML

SSgA Money Market Fund

FUND SUMMARY SSgA MONEY MARKET FUND

INVESTMENT OBJECTIVE

SSgA Money Market Fund seeks to maximize current income, to the extent consistent with the preservation of capital and liquidity and the maintenance of a stable $1.00 per share net asset value, by investing in dollar-denominated securities.

FEES AND EXPENSES OF THE FUND

This table describes the fees and expenses that you may pay if you buy and hold shares of the fund.

Shareholder Fees (USD $)	SSgA Money Market Fund Institutional
Shareholder Fees (fees paid directly from your investment)	none

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

Annual Fund Operating Expenses		SSgA Money Market Fund Institutional
Management Fee		0.25%
Distribution and Shareholder Service (12b-1) Fees		0.08%
Other Expenses		0.06%
Total Annual Fund Operating Expenses		0.39%
Less Fee Waivers and/or Expense Reimbursements	[1]	none
Total Annual Fund Operating Expenses After Fee Waivers and Expense Reimbursements		0.39%

EXAMPLE

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, that all dividends and distributions are reinvested, and that the fund’s operating expenses remain the same. The calculation of costs for the one-year period takes into account the effect of any current contractual fee waivers and/or reimbursements; and the calculation of costs for the remaining periods takes such fee waivers and/or reimbursements into account only for the first year of the periods. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:

Expense Example (USD $)	1 year	3 years	5 years	10 years
SSgA Money Market Fund Institutional	40	125	219	493

PRINCIPAL INVESTMENT STRATEGIES

SSgA Money Market Fund follows a disciplined investment process that attempts to provide stability of principal, liquidity and current income through all market conditions by investing in high quality money market instruments. The fund invests in accordance with regulatory requirements applicable to money market funds, which impose strict conditions on the quality of portfolio securities, liquidity of portfolio holdings, the maturity of individual securities and the portfolio as a whole, and portfolio diversification.

The fund attempts to meet its investment objective by investing in a broad range of money market instruments, including certificates of deposit, bank notes and other bank instruments, commercial paper, repurchase agreements, asset-backed securities, corporate obligations, instruments issued or guaranteed by the U.S. government, its agencies and sponsored entities. These instruments may bear fixed, variable or floating rates of interest or may be zero coupon securities.

PRINCIPAL RISKS

An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Although the fund seeks to preserve the value of your investment at $1.00 per share, it is possible to lose money by investing in the fund.

• Risks Common to Funds Investing Principally in Debt Instruments.

• Interest Rate Risk—The risk that interest rates will rise, causing the value of the fund’s assets to fall.

• Credit Risk—The risk that an issuer, guarantor or liquidity provider of an instrument held by the fund will fail to make scheduled interest or principal payments, which may reduce the fund’s income and the market value of the instrument.

• Prepayment Risk (when repayment of principal occurs before scheduled maturity) and Extension Risk (when rates of repayment of principal are slower than expected)—Applicable primarily to mortgage-related securities, the risks that the underlying loan obligations may be refinanced (repaid) faster or slower than expected, causing the fund to invest repayment proceeds in, or continue to hold, lower yielding securities, as the case may be.

• Liquidity Risk—The risk that the fund may not be able to sell some or all of its securities at desired prices or may be unable to sell the securities at all, because of a lack of demand in the market for such securities, or a liquidity provider defaults on its obligation to purchase the securities when properly tendered by the fund.

• Risk Associated with Maintaining a Stable Share Price. To the extent that the aggregate market value of the fund’s assets materially varies from the aggregate of the acquisition prices of those assets, the fund may not be able to maintain a stable share price of $1.00. This risk typically is higher during periods of rapidly changing interest rates or when issuer credit quality generally is falling, and is made worse when the fund experiences significant redemption requests.

• Rapid Changes in Interest Rates. Rapid changes in interest rates may cause significant requests to redeem fund shares, and possibly cause the fund to sell portfolio securities at a loss to satisfy those requests.

• Low Short-Term Interest Rates. As short-term interest rates approach 0%, the fund may maintain substantial cash balances. The fund typically does not receive any income from uninvested cash. In addition, if the fund generates insufficient income to pay its expenses, it may not pay a daily dividend.

• Concentrated Exposure to Financial Institutions. Many instruments in which the fund invests, including repurchase agreements, are issued or guaranteed by financial institutions, such as banks and brokers, or are collateralized by securities issued or guaranteed by financial institutions. Changes in the credit worthiness of any of these institutions may adversely affect the value of instruments held by the fund.

• Foreign Securities. The fund may invest in U.S. dollar denominated instruments issued by foreign governments, corporations and financial institutions. Financial information relating to foreign issuers may be more limited than financial information generally available for domestic issuers. In addition, the value of instruments of foreign issuers may be adversely affected by local or regional political and economic developments.

Please refer to “Fund Objectives, Strategies and Risks” in the Prospectus for further details.

PERFORMANCE

The following bar chart shows how the fund’s performance has varied from year to year, and the table immediately below the chart shows the performance of the fund over the past 1-, 5- and 10-year periods, and over the life of the fund. The bar chart and the table provide some indication of the risks of investing in the fund. A fund’s past performance (both before and after taxes) is not necessarily an indication of how the fund will perform in the future. Current performance information for the fund is available toll free by calling (800) 647-7327 or by visiting our website at www.ssgafunds.com.

Annual Total Returns - SSgA Money Market Fund

Highest Quarterly Results (2002-2011)	Lowest Quarterly Results (2002-2011)	Year-to- Date Ended
September 30, 2007: 1.26%	December 31, 2011: 0.00%	September 30, 2012: 0.01%

Average Annual Total Returns
for the Periods Ending December 31, 2011:

Average Annual Total Returns		1 Year	5 Years	10 Years
SSgA Money Market Fund Institutional	[1]	0.01%	1.53%	1.87%

To obtain the fund’s current yield, please call (800) 997-7327.

[1] The fund's investment advisor is contractually obligated until December 31, 2013 to waive its management fee and to reimburse the fund for all expenses to the extent that total expenses (exclusive of non-recurring account fees, extraordinary expenses and acquired fund fees) exceed 0.40% of average daily net assets on an annual basis. This waiver and reimbursement may not be terminated during the relevant period except with Board approval. Extraordinary expenses that are not subject to the foregoing contractual expense limitation agreement include, but are not limited to, any reimbursement payments made by the fund to the fund's investment advisor of fund fees and expenses that were previously waived or reimbursed by the fund's investment advisor in order to maintain a non-negative net yield for the fund. The fund's investment advisor may also reduce all or a portion of its fees and/or reimburse expenses of the fund to the extent necessary to maintain a minimum net yield for the fund (the "Voluntary Reduction") which may vary from time to time in the investment advisor's sole discretion. The fund has agreed, subject to certain limitations, to reimburse its investment advisor for the full dollar amount of any Voluntary Reduction incurred after August 1, 2012. As of August 1, 2012, the fund's investment advisor waived fees and/or reimbursed expenses in the amount of $685,760 under the voluntary yield waiver. Any future reimbursement of previously waived fees by the fund to its investment advisor may cause the total fund annual operating expenses of the fund to exceed the expense limitation under the contractual expense limitation agreement. The investment advisor may, in its sole discretion, irrevocably waive receipt of any or all reimbursement amounts due from the fund, without limitation.Total Annual Fund Operating Expenses may be higher than the fund's ratio of expenses to average net assets shown in the Financial Highlights, which reflect the operating expenses of the fund including voluntary waivers.

[1] The returns would have been lower without the contractual and voluntary management fee waiver and/or expense reimbursement.

XML

Label

Element

Value

Risk/Return:

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Registrant Name

dei_EntityRegistrantName

SSGA FUNDS

Prospectus Date

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Dec. 14, 2012

SSgA S&P 500 Index Fund

Risk/Return:

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Risk/Return [Heading]

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FUND SUMMARY SSgA S&P 500 INDEX FUND

Objective [Heading]

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INVESTMENT OBJECTIVE

Objective, Primary [Text Block]

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SSgA S&P 500 Index Fund seeks to replicate as closely as possible, before expenses, the performance of the Standard & Poor’s® 500 Index.

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. As a shareholder in the State Street Equity 500 Index Portfolio (the “Portfolio”), the fund bears and the table reflects its ratable share of the Portfolio’s expenses, including advisory and administrative fees, and at the same time continues to pay its own fees and expenses. The example below also reflects the expenses of both the fund and the Portfolio.

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)

Fee Waiver or Reimbursement over Assets, Date of Termination

rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination

December 31, 2013

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). As a shareholder of the Portfolio, the fund bears its ratable share of the transaction costs associated with the portfolio turnover of the Portfolio. A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund 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 Portfolio’s turnover rate was 19% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

19.00%

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, that all dividends and distributions are reinvested, and that the fund’s operating expenses remain the same. The calculation of costs for the one-year period takes into account the effect of any current contractual fee waivers and/or reimbursements; and the calculation of costs for the remaining periods takes such fee waivers and/or reimbursements into account only for the first year of the periods. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:

Strategy [Heading]

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PRINCIPAL INVESTMENT STRATEGIES

Strategy Narrative [Text Block]

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There is no assurance that the fund will achieve its investment objective, and you could lose money by investing in the fund. SSgA S&P 500 Index Fund seeks to achieve its investment objective by investing substantially all of its assets in the Portfolio, the “master fund” that has the same investment objective as, and investment policies that are substantially similar to those of, the fund. This is commonly referred to as a “master/feeder” complex, with the fund serving as the “feeder” fund and the Portfolio serving as the “master” fund. The Portfolio uses a passive management strategy designed to track the performance of the S&P 500. The Index is a well-known stock market index that includes common stocks of 500 companies from a number of sectors representing a significant portion of the market value of all stocks publicly traded in the United States.

The Portfolio is not managed according to traditional methods of “active” investment management, which involve the buying and selling of securities based upon economic, financial and market analysis and investment judgment. Instead, the Portfolio, using a “passive” or “indexing” investment approach, attempts to replicate, before expenses, the performance of the S&P 500.

Under normal market conditions, the Portfolio will not invest less than 80% of its total assets in stocks in the Index. The fund attempts to replicate the investment performance of the S&P 500 Index and generally intends to invest, via the Portfolio, in all 500 stocks comprising the S&P 500 in approximate proportion to their weightings in the Index. However, it may not be possible or practicable to purchase all 500 stocks of the S&P 500 Index in those weightings. When it is not possible or practicable to purchase all 500 stocks of the S&P 500 Index in those weightings, the Portfolio may purchase a representative sample of the stocks listed in the S&P 500 Index in proportion expected by the investment advisor to match generally the performance of the Index as a whole. In addition, from time to time stocks are added to or removed from the Index. The Portfolio may sell securities that are represented in the Index, or purchase securities that are not yet represented in the Index, in anticipation of their removal from or addition to the Index. Shareholders will receive 60 days’ notice prior to a change in the 80% investment policy.

In addition to common stocks in the S&P 500 Index, the Portfolio may at times purchase or sell futures contracts on the Index, or options on those futures, in lieu of investing directly in the stocks making up the Index. The Portfolio might do so, for example, in order to increase its investment exposure pending investment of cash in the stocks comprising the Index. Alternatively, the Portfolio might use futures or options on futures to reduce its investment exposure in situations where it intends to sell a portion of the stocks in its portfolio but the sale has not yet been completed. The Portfolio may also enter into other derivatives transactions, including the use of options or swap transactions, to assist in attempting to replicate the performance of the Index. The Portfolio may also, to the extent permitted by applicable law, invest in shares of other mutual funds whose investment objectives and policies are similar to those of the Portfolio.

Risk [Heading]

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PRINCIPAL RISKS

Risk Narrative [Text Block]

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It is possible to lose money by investing in the fund. 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.

• Risks Common to Funds Investing Principally in Equity Securities.

• Market, Industry and Specific Holdings—The share price of the fund may fall because of weakness in the stock markets, generally, weaknesses with respect to a particular industry in which the fund has significant holdings, or weaknesses associated with one or more specific companies in which the fund may have substantial investments.

• Index Tracking Risk. The Portfolio’s return may not match the return of the Index for a number of reasons. For example, the return on the securities and other investments selected by the investment advisor may not correlate precisely with the return on the Index. The Portfolio incurs a number of operating expenses not applicable to the Index, and incurs costs in buying and selling securities. The Portfolio may not be fully invested at times, either as a result of cash flows into or out of the Portfolio or reserves of cash held by the Portfolio to meet redemptions. The return on the sample of securities purchased by the Portfolio, or futures or other derivative positions taken by the Portfolio, to replicate the performance of the Index may not correlate precisely with the return of the Index.

• Large-Capitalization Securities. Because the S&P 500 includes mainly large U.S. companies, the Portfolio’s emphasis on securities issued by large capitalization companies makes it susceptible to the risks of investing in larger companies. Large-capitalization companies usually cannot respond as quickly as smaller companies to competitive challenges, and their growth rates tend to lag the growth rates of well-managed smaller companies during strong economic periods.

• Master/Feeder Structure Risk. The ability of the fund to meet its investment objective and redeem investors is directly related to the ability of the master fund to meet its objective and redeem fund interests in the master fund. The ability of the fund to meet its objective may be adversely affected by the purchase and redemption activities of other investors in the Portfolio. SSgA Funds Management, Inc., the fund’s investment advisor, also serves as investment advisor to the Portfolio. For example, the investment advisor may have an economic incentive to maintain the fund’s investment in the Portfolio at a time when it might otherwise choose not to do so. The trustees and officers of the fund will consider any conflict between the fund and the Portfolio and take such actions as they deem appropriate.

• Derivatives. The Portfolio’s investments in derivative instruments are subject to a number of risks, such as counterparty risk, the risk of mispricing or improper valuation, and the risk that the value of the instrument may not increase or decrease as expected. Derivative transactions typically involve leverage and may be highly volatile. It is possible that a derivative transaction will result in a loss greater than the principal amount invested, and the Portfolio may not be able to close out a derivative transaction at a favorable time or price.

• Passive Strategy/Index Risk. The Portfolio is managed with a passive investment strategy, attempting to track the performance of an unmanaged index of securities. This differs from an actively managed fund, which typically seeks to outperform a benchmark index. As a result, the Portfolio may hold constituent securities of the S&P 500 regardless of the current or projected performance of a specific security or a particular industry or market sector. Maintaining investments in securities regardless of market conditions or the performance of individual securities could cause the Portfolio’s return to be lower than if the Portfolio employed an active strategy.

Please refer to “Fund Objectives, Strategies and Risks” in the Prospectus for further details.

Risk Lose Money [Text]

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It is possible to lose money by investing in the fund.

Risk Not Insured Depository Institution [Text]

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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.

Bar Chart and Performance Table [Heading]

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PERFORMANCE

Performance Narrative [Text Block]

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The following bar chart shows how the fund’s performance has varied from year to year, and the table immediately below the chart shows the performance of the fund over the past 1-, 5- and 10-year periods, and over the life of the fund, and compares the fund’s performance to the performance of a broad-based securities market index. The bar chart and the table provide some indication of the risks of investing in the fund. Index returns do not reflect deductions for fees, taxes or expenses associated with investment in a fund. A fund’s past performance (both before and after taxes) is not necessarily an indication of how the fund will perform in the future. Current performance information for the fund is available toll free by calling (800) 647-7327 or by visiting our website at www.ssgafunds.com.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The following bar chart shows how the fund’s performance has varied from year to year, and the table immediately below the chart shows the performance of the fund over the past 1-, 5- and 10-year periods, and over the life of the fund, and compares the fund’s performance to the performance of a broad-based securities market index.

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

(800) 647-7327

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.ssgafunds.com

Performance Past Does Not Indicate Future [Text]

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A fund’s past performance (both 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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Annual Total Returns - SSgA S&P 500 Index Fund

Bar Chart Closing [Text Block]

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Highest Quarterly Results(2002-2011)	Lowest Quarterly Results(2002-2011)	Year-to- Date Ended
June 30, 2009: 15.84%	December 31, 2008: (21.89)%	September 30, 2012: 16.53%

Performance Table Heading

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Average Annual Total Returns for the Periods Ending December 31, 2011:

Index No Deduction for Fees, Expenses, Taxes [Text]

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Index returns do not reflect deductions for fees, taxes or expenses associated with investment in a fund.

Performance Table Uses Highest Federal Rate

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After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

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After-tax returns depend on an investor’s tax situation and may differ from those shown, and after-tax returns are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts (IRAs).

Performance Table Narrative

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

SSgA S&P 500 Index Fund | Institutional

Risk/Return:

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Shareholder Fees (fees paid directly from your investment)

rr_ShareholderFeeOther

none

Management Fee

rr_ManagementFeesOverAssets

0.045%

^[1]

Distribution and Shareholder Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.071%

Other Expenses

rr_OtherExpensesOverAssets

0.074%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.19%

Less Fee Waivers and/or Expense Reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.01%)

^[2]

Total Annual Fund Operating Expenses After Fee Waivers and Expense Reimbursements

rr_NetExpensesOverAssets

0.18%

^[2]

1 year

rr_ExpenseExampleYear01

18

3 years

rr_ExpenseExampleYear03

60

5 years

rr_ExpenseExampleYear05

106

10 years

rr_ExpenseExampleYear10

242

2002

rr_AnnualReturn2002

(22.34%)

2003

rr_AnnualReturn2003

28.59%

2004

rr_AnnualReturn2004

10.74%

2005

rr_AnnualReturn2005

4.71%

2006

rr_AnnualReturn2006

15.60%

2007

rr_AnnualReturn2007

5.41%

2008

rr_AnnualReturn2008

(37.03%)

2009

rr_AnnualReturn2009

26.22%

2010

rr_AnnualReturn2010

14.94%

2011

rr_AnnualReturn2011

1.86%

Year to Date Return, Label

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Year-to-Date Ended

Bar Chart, Year to Date Return, Date

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Sep. 30, 2012

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

16.53%

Highest Quarterly Return, Label

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Highest Quarterly Results (2002-2011)

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

15.84%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarterly Results (2002-2011)

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(21.89%)

1 Year

rr_AverageAnnualReturnYear01

1.86%

^[3]

5 Years

rr_AverageAnnualReturnYear05

(0.39%)

^[3]

10 Years

rr_AverageAnnualReturnYear10

2.76%

^[3]

SSgA S&P 500 Index Fund | Return After Taxes on Distributions | Institutional

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

1.17%

^[3]

5 Years

rr_AverageAnnualReturnYear05

(0.77%)

^[3]

10 Years

rr_AverageAnnualReturnYear10

2.40%

^[3]

SSgA S&P 500 Index Fund | Return After Taxes on Distributions and Sale of Fund Shares | Institutional

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

1.21%

^[3]

5 Years

rr_AverageAnnualReturnYear05

(0.44%)

^[3]

10 Years

rr_AverageAnnualReturnYear10

2.27%

^[3]

SSgA S&P 500 Index Fund | S&P 500® Index (reflects no deduction for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

2.11%

^[3]

5 Years

rr_AverageAnnualReturnYear05

(0.25%)

^[3]

10 Years

rr_AverageAnnualReturnYear10

2.92%

^[3]

[1] Amounts reflect the total expenses of the Portfolio and the fund.

[2] The fund’s investment advisor is contractually obligated until December 31, 2013 to reimburse the fund for expenses to the extent that total expenses (exclusive of non-recurring account fees, extraordinary expenses and acquired fund fees) exceed 0.18% of average daily net assets on an annual basis. This waiver and reimbursement may not be terminated during the relevant period except with Board approval.

[3] The returns would have been lower without the contractual fee waiver and/or expense reimbursement.

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SSgA International Stock Selection Fund

FUND SUMMARY SSgA INTERNATIONAL STOCK SELECTION FUND

INVESTMENT OBJECTIVE

SSgA International Stock Selection Fund seeks to provide long-term capital growth by investing primarily in securities of foreign issuers.

FEES AND EXPENSES OF THE FUND

This table describes the fees and expenses that you may pay if you buy and hold shares of the fund.

Shareholder Fees (USD $)	SSgA International Stock Selection Fund Institutional
Shareholder Fees (fees paid directly from your investment)	none

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

Annual Fund Operating Expenses		SSgA International Stock Selection Fund Institutional
Management Fee		0.75%
Distribution and Shareholder Service (12b-1) Fees		0.24%
Other Expenses		0.22%
Total Annual Fund Operating Expenses		1.21%
Less Fee Waivers and/or Expense Reimbursements	[1]	(0.21%)
Total Annual Fund Operating Expenses After Fee Waivers and Expense Reimbursements	[1]	1.00%

EXAMPLE

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, that all dividends and distributions are reinvested, and that the fund’s operating expenses remain the same. The calculation of costs for the one-year period takes into account the effect of any current contractual fee waivers and/or reimbursements; and the calculation of costs for the remaining periods takes such fee waivers and/or reimbursements into account only for the first year of the periods. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:

Expense Example (USD $)	1 year	3 years	5 years	10 years
SSgA International Stock Selection Fund Institutional	102	363	645	1,447

PORTFOLIO TURNOVER

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 fund 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 turnover rate was 90% of the average value of its portfolio.

PRINCIPAL INVESTMENT STRATEGIES

SSgA International Stock Selection Fund will invest at least 80% of its net assets (plus borrowings, if any) in equity securities issued by companies in the countries and industries represented in the MSCI EAFE Index, the fund’s benchmark. The equity securities invested in by the fund are comprised primarily of common stocks and may include IPOs as well as ETFs for cash equitization purposes.

The fund’s advisor employs a proprietary quantitative stock-selection model. This model is intended to reflect the risk characteristics of the fund’s benchmark, as well as determine the specific securities and quantities the fund purchases, holds and sells. In addition, it is intended to predict the relative attractiveness of securities from a specified investment universe based on the correlation of certain historical economic and financial factors applicable to issuers and/or countries (such as measures of growth potential, valuation, quality, and investor sentiment) to past performance. Additionally the model may also incorporate an element to evaluate the macroeconomic environment for a portion of the model determined by prevailing market conditions. This element allows a disciplined approach to seek to be adaptive to the macroeconomic environment and respond to changing conditions. The quantitative model allows the advisor to evaluate quickly each eligible security and then rank all eligible securities in the fund’s investment universe in the order of their attractiveness as fund investments.

The model generates a portfolio that is drawn primarily from securities in the fund’s benchmark. The remaining securities are drawn from the fund’s investment universe and are determined by the model in order to overweight or underweight certain countries, securities, industries and sectors represented in the benchmark. The fund’s investment universe is the securities in the MSCI EAFE Universe, which is broader than the fund’s benchmark. The fund periodically rebalances its portfolio to reflect movements in the underlying factors used by the model and changes predicted by the model. The model may periodically adjust the quantitative metrics used based on a systematic and objective evaluation of macroeconomic conditions. The advisor also regularly reexamines the model and may make updates and adjustments to the economic and financial conditions and other quantitative metrics considered, and to the weightings among them.

The fund attempts to meet its investment objective by investing primarily in, among other things, common stocks. The fund also may lend its securities, and it may invest in various fixed-income securities, index futures and money market funds in order to manage its cash. The fund also may engage in active trading, which could reduce the returns of fund shareholders investing through a taxable account, the fund may take temporary defensive positions that are inconsistent with its principal investment strategies.

PRINCIPAL RISKS

It is possible to lose money by investing in the fund. 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.

• Risks Common to Funds Investing Principally in Equity Securities.

• Market, Industry and Specific Holdings—The share price of the fund may fall because of weakness in the stock markets, generally, weaknesses with respect to a particular industry in which the fund has significant holdings, or weaknesses associated with one or more specific companies in which the fund may have substantial investments.

• Liquidity Risk—The risk that the fund may not be able to sell some or all of its securities at desired prices or may be unable to sell the securities at all.

• Use of a Quantitative Strategy. A quantitative investment strategy generally is based on the assumption that the future performance of a specific security relative to other securities may be predicted based on the correlation of certain historical economic and financial factors to past performance. Over time, the correlation between these factors and performance may diminish, which may impair the fund’s ability to achieve its investment objective.

• Foreign Securities, including Emerging Market Securities. To the extent the fund holds securities of foreign issuers, financial information concerning those issuers may be unavailable or more limited than information generally available from U.S. issuers, and it may have difficulty selling the securities or protecting its investment. Foreign securities also tend to be adversely affected by local or regional political and economic developments, as well as changes in exchange rates, and the inconvertibility of local currency into U.S. dollars. For emerging market equity securities, these risks tend to be greater than for securities of issuers located in more developed countries.

• Sector. The fund may have significant investments in one or more specific industry sectors, subjecting it to risks greater than general market risk.

• Derivatives. The fund’s investments in derivative instruments are subject to a number of risks, such as counterparty risk, the risk of mispricing or improper valuation, and the risk that the value of the instrument may not increase or decrease as expected.

Please refer to “Fund Objectives, Strategies and Risks” in the Prospectus for further details.

PERFORMANCE

The following bar chart shows how the fund’s performance has varied from year to year, and the table immediately below the chart shows the performance of the fund over the past 1-, 5- and 10-year periods, and over the life of the fund, and compares the fund’s performance to the performance of a broad-based securities market index. The bar chart and the table provide some indication of the risks of investing in the fund. Index returns do not reflect deductions for fees, taxes or expenses associated with investment in a fund. A fund’s past performance (both before and after taxes) is not necessarily an indication of how the fund will perform in the future. Current performance information for the fund is available toll free by calling (800) 647-7327 or by visiting our website at www.ssgafunds.com.

Average Annual Total Returns - SSgA International Stock Selection Fund

Highest Quarterly Results (2002-2011)	Lowest Quarterly Results (2002-2011)	Year-to- Date Ended
June 30, 2009: 20.47%	September 30, 2011: (22.85)%	September 30, 2012: 7.64%

Average Annual Total Returns
For the Periods Ending December 31, 2011:

Average Annual Total Returns SSgA International Stock Selection Fund		1 Year	5 Years	10 Years
Institutional	[1]	(15.03%)	(6.77%)	4.86%
Institutional Return After Taxes on Distributions	[1]	(16.16%)	(7.24%)	4.41%
Institutional Return After Taxes on Distributions and Sale of Fund Shares	[1]	(9.75%)	(5.57%)	4.31%
MSCI® EAFE® Net Dividend Index (reflects no deduction for fees, expenses or taxes)	[1]	(12.14%)	(4.72%)	4.67%

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

[1] The fund's investment advisor is contractually obligated until December 31, 2013 to waive its management fee and to reimburse the fund for expenses to the extent that total expenses (exclusive of non-recurring account fees, extraordinary expenses and acquired fund fees) exceed 1.00% of average daily net assets on an annual basis. This waiver and reimbursement may not be terminated during the relevant period except with Board approval.

[1] The returns would have been lower without the contractual fee waiver and/or expense reimbursement.

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

SSGA FUNDS

Prospectus Date

rr_ProspectusDate

Dec. 14, 2012

SSgA Bond Market Fund

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

FUND SUMMARY SSgA BOND MARKET FUND

Objective [Heading]

rr_ObjectiveHeading

INVESTMENT OBJECTIVE

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

SSgA Bond Market Fund seeks to maximize total return by investing in fixed income securities, including, but not limited to, those represented by the Barclays Capital U.S. Aggregate Bond Index.

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.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder Fees
     (fees paid directly from your investment)

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

December 31, 2013

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

PORTFOLIO TURNOVER

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The fund pays transaction costs, typically reflected in a bond’s purchase or sale price, 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 fund 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 turnover rate was 205% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

205.00%

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 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, that all dividends and distributions are reinvested, and that the fund’s operating expenses remain the same. The calculation of costs for the one-year period takes into account the effect of any current contractual fee waivers and/or reimbursements; and the calculation of costs for the remaining periods takes such fee waivers and/or reimbursements into account only for the first year of the periods. 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

SSgA Bond Market Fund attempts to meet its objective by investing at least 80% of its net assets (plus borrowings, if any) in debt instruments. The fund’s portfolio typically consists of a core portfolio principally drawn from, and that is intended to reflect the overall risk characteristics of, the securities in the Barclays Capital U.S. Aggregate Bond Index, the fund’s benchmark. The fund then selects other securities, which may be securities inside or outside of the benchmark, to overweight or underweight certain industries and sectors represented in the benchmark. The fund also manages its duration (that is, the sensitivity of the fund’s portfolio as a whole to interest rate changes) generally by investing in futures and primarily to correspond to the benchmark. The fund actively trades its portfolio holdings in an effort to benefit from short-term yield disparities among different issues of fixed income securities, or otherwise to increase total return to the fund.

The fund invests primarily in investment grade debt instruments. Many of those instruments are instruments issued or guaranteed as to principal and interest by the U.S. government or its agencies and instrumentalities, obligations of U.S. and foreign corporations (e.g., “Yankee” bonds), including public utilities; obligations of U.S. and foreign financial institutions; repurchase agreements collateralized with high quality securities and other assets; derivatives, including swaps, futures and options; and asset-backed securities, including asset-backed commercial paper and mortgage-related securities. Such instruments typically are denominated in U.S. dollars. The fund may also invest in high yield bonds commonly referred to as “junk bonds.” High yield bonds, and to a lesser extent other types of bonds, may be purchased at a discount to their face value and thereby provide opportunities to the fund for capital appreciation. The fund may buy or sell securities on a forward commitment, delayed-delivery or when-issued basis. These transactions involve the purchase or sale of securities by a fund at an established price with payment or delivery taking place in the future. The fund also may lend its securities, and it may invest in various fixed-income securities and money market funds, including money market funds advised by the fund’s investment advisor, in order to manage its cash. The fund also may engage in active trading, which could reduce the returns of fund shareholders investing through a taxable account, and the fund may take temporary defensive positions that are inconsistent with its principal investment strategies.

Risk [Heading]

rr_RiskHeading

PRINCIPAL RISKS

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

It is possible to lose money by investing in the fund. 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.

• Risks Common to Funds Investing Principally in Debt Instruments.

• Interest Rate Risk—The risk that interest rates will rise, causing the value of the fund’s assets to fall.

• Credit Risk—The risk that an issuer, guarantor or liquidity provider of an instrument held by the fund will fail to make scheduled interest or principal payments, which may reduce the fund’s income and the market value of the instrument.

• Prepayment Risk (when repayment of principal occurs before scheduled maturity) and Extension Risk (when rates of repayment of principal are slower than expected)—Applicable primarily to mortgage-related securities, the risks that the underlying loan obligations may be refinanced (repaid) faster or slower than expected, causing the fund to invest repayment proceeds in, or continue to hold, lower yielding securities, as the case may be.

• Liquidity Risk—The risk that the fund may not be able to sell some or all of its securities at desired prices or may be unable to sell the securities at all, because of a lack of demand in the market for such securities, or a liquidity provider defaults on its obligation to purchase the securities when properly tendered by the fund.

• Rapid Changes in Interest Rates. Rapid changes in interest rates may cause significant requests to redeem fund shares, and possibly cause the fund to sell portfolio securities at a loss to satisfy those requests.

• Significant Exposure to U.S. Government Agencies and Financial Institutions. Events that would adversely affect the market prices of securities issued or guaranteed by one government agency may adversely affect the market price of securities issued or guaranteed by other government agencies. Similarly, events that would affect the market value of instruments issued by one financial institution, including repurchase agreements, may adversely affect the market value of instruments issued by similarly situated financial institutions.

• Mortgage-Related and Other Asset-Backed Securities. Defaults on the underlying assets of the mortgage-related and other asset-backed securities held by the fund may impair the value of those securities, and there may be limitations on the enforceability of any security interest granted with respect to those assets. These securities also present a higher degree of prepayment risk and extension risk than do other types of fixed income securities.

• Non-Investment Grade Securities. Securities rated below investment grade (that is, below BBB by S&P or Baa by Moody’s) are regarded as predominantly speculative with respect to capacity to pay interest and repay principal in accordance with the terms of the obligation. High yield bonds generally are not as sensitive to interest rate changes as investment grade bonds.

• Foreign Securities. To the extent the fund holds securities of foreign issuers, financial information concerning those issuers may be unavailable or more limited than information generally available from U.S. issuers, and it may have difficulty selling the securities or protecting its investment. Foreign securities also tend to be adversely affected by local or regional political and economic developments. Most of the foreign securities held by the fund are “Yankee” bonds, that is, U.S. dollar-denominated foreign bonds. The value of non-U.S. dollar denominated foreign bonds in which the fund may invest also may be subject to changes in exchange rates.

• Derivatives. The fund’s investments in derivative instruments are subject to a number of risks, such as counterparty risk, the risk of mispricing or improper valuation, and the risk that the value of the instrument may not increase or decrease as expected.

• Forward-Commitment, When-Issued and Delayed-Delivery Securities. Forward-commitment, delayed-delivery and when-issued transactions involve a risk of loss if the value of the security to be purchased or sold by the fund increases or decreases below the repurchase price of those securities or the other party to the transaction fails to complete the transaction.

Please refer to “Fund Objectives, Strategies and Risks” in the Prospectus for further details.

Risk Lose Money [Text]

rr_RiskLoseMoney

It is possible to lose money by investing in the fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

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.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

PERFORMANCE

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following bar chart shows how the fund’s performance has varied from year to year, and the table immediately below the chart shows the performance of the fund over the past 1-, 5- and 10-year periods, and over the life of the fund, and compares the fund’s performance to the performance of a broad-based securities market index. The bar chart and the table provide some indication of the risks of investing in the fund. Index returns do not reflect deductions for fees, taxes or expenses associated with investment in a fund. A fund’s past performance (both before and after taxes) is not necessarily an indication of how the fund will perform in the future. Current performance information for the fund is available toll free by calling (800) 647-7327 or by visiting our website at www.ssgafunds.com.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The following bar chart shows how the fund’s performance has varied from year to year, and the table immediately below the chart shows the performance of the fund over the past 1-, 5- and 10-year periods, and over the life of the fund, and compares the fund’s performance to the performance of a broad-based securities market index.

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

(800) 647-7327

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.ssgafunds.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

A fund’s past performance (both before and after taxes) is not necessarily an indication of how the fund will perform in the future.

Bar Chart [Heading]

rr_BarChartHeading

Annual Total Returns - SSgA Bond Market Fund

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

Highest Quarterly Results (2002-2011)	Lowest Quarterly Results (2002-2011)	Year-to- Date Ended
September 30, 2002: 4.80%	December 31, 2007: (5.58)%	September 30, 2012: 4.51%

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns
For the Periods Ending December 31, 2011:

Index No Deduction for Fees, Expenses, Taxes [Text]

rr_IndexNoDeductionForFeesExpensesTaxes

Index returns do not reflect deductions for fees, taxes or expenses associated with investment in a fund.

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

After-tax returns depend on an investor’s tax situation and may differ from those shown, and after-tax returns are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts (IRAs).

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

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

SSgA Bond Market Fund | Institutional

Risk/Return:

rr_RiskReturnAbstract

Shareholder Fees (fees paid directly from your investment)

rr_ShareholderFeeOther

none

Management Fee

rr_ManagementFeesOverAssets

0.30%

Distribution and Shareholder Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.07%

Other Expenses

rr_OtherExpensesOverAssets

0.90%

Acquired Fund Fee and Expenses (fees and expenses incurred indirectly by the fund as a result of an investment in shares of one or more acquired funds)

rr_AcquiredFundFeesAndExpensesOverAssets

0.01%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.28%

Less Fee Waivers and/or Expense Reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.77%)

^[1]

Total Annual Fund Operating Expenses After Fee Waivers and Expense Reimbursements

rr_NetExpensesOverAssets

0.51%

^[1]

1 year

rr_ExpenseExampleYear01

52

3 years

rr_ExpenseExampleYear03

330

5 years

rr_ExpenseExampleYear05

628

10 years

rr_ExpenseExampleYear10

1,477

2002

rr_AnnualReturn2002

10.00%

2003

rr_AnnualReturn2003

3.66%

2004

rr_AnnualReturn2004

4.03%

2005

rr_AnnualReturn2005

1.91%

2006

rr_AnnualReturn2006

3.91%

2007

rr_AnnualReturn2007

(7.89%)

2008

rr_AnnualReturn2008

(1.86%)

2009

rr_AnnualReturn2009

9.66%

2010

rr_AnnualReturn2010

7.72%

2011

rr_AnnualReturn2011

6.76%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Ended

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Sep. 30, 2012

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

4.51%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarterly Results (2002-2011)

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Sep. 30, 2002

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

4.80%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarterly Results (2002-2011)

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2007

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(5.58%)

1 Year

rr_AverageAnnualReturnYear01

6.76%

^[2]

5 Years

rr_AverageAnnualReturnYear05

2.66%

^[2]

10 Years

rr_AverageAnnualReturnYear10

3.66%

^[2]

SSgA Bond Market Fund | Return After Taxes on Distributions | Institutional

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

5.54%

^[2]

5 Years

rr_AverageAnnualReturnYear05

1.18%

^[2]

10 Years

rr_AverageAnnualReturnYear10

2.03%

^[2]

SSgA Bond Market Fund | Return After Taxes on Distributions and Sale of Fund Shares | Institutional

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

4.37%

^[2]

5 Years

rr_AverageAnnualReturnYear05

1.38%

^[2]

10 Years

rr_AverageAnnualReturnYear10

2.16%

^[2]

SSgA Bond Market Fund | Barclays Capital U.S. Aggregate Bond Index (reflects no deduction for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

7.84%

^[2]

5 Years

rr_AverageAnnualReturnYear05

6.50%

^[2]

10 Years

rr_AverageAnnualReturnYear10

5.78%

^[2]

[1] The fund's investment advisor is contractually obligated until December 31, 2013 to waive its management fee and to reimburse the fund for expenses to the extent that total expenses (exclusive of non-recurring account fees, extraordinary expenses and acquired fund fees) exceed 0.50% of average daily net assets on an annual basis. This waiver and reimbursement may not be terminated during the relevant period except with Board approval.

[2] The returns would have been lower without the contractual fee waiver and/or expense reimbursement.

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

SSGA FUNDS

Prospectus Date

rr_ProspectusDate

Dec. 14, 2012

SSgA High Yield Bond Fund

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

FUND SUMMARY SSgA HIGH YIELD BOND FUND

Objective [Heading]

rr_ObjectiveHeading

INVESTMENT OBJECTIVE

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

SSgA High Yield Bond Fund seeks to maximize total return by investing primarily in fixed-income securities, including, but not limited to, those represented by the Barclays Capital U.S. Corporate High-Yield Bond Index.

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.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder Fees
     (fees paid directly from your investment)

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

December 31, 2013

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

PORTFOLIO TURNOVER

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The fund pays transaction costs, typically reflected in a bond’s purchase or sale price, 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 fund 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 turnover rate was 196% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

196.00%

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 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, that all dividends and distributions are reinvested, and that the fund’s operating expenses remain the same. The calculation of costs for the one-year period takes into account the effect of any current contractual fee waivers and/or reimbursements; and the calculation of costs for the remaining periods takes such fee waivers and/or reimbursements into account only for the first year of the periods. 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

SSgA High Yield Bond Fund attempts to meet its objective by investing at least 80% of its net assets (plus borrowings, if any) in high yield bonds commonly referred to as “junk bonds”. The fund’s portfolio typically consists of a core portfolio principally drawn from securities in the Barclays Capital U.S. High-Yield 2% Issuer Capped Index, the fund’s benchmark, as well as other securities that have been selected to overweight or underweight certain securities, industries and sectors represented in the benchmark. Intensive credit analysis of specific issuers is an important component of the fund’s securities selection process. High yield bonds, and to a lesser extent other types of bonds, may be purchased at a discount to their face value and thereby provide opportunities to the fund for capital appreciation. The duration of the fund (that is, its sensitivity to changes in interest rates) is monitored against the benchmark.

The fund invests primarily in debt securities that have been publicly issued or privately placed, with fixed, zero coupon, payment-in-kind, variable or floating interest rates. The fund’s investments may include: obligations of U.S. and foreign corporations (e.g., “Yankee” bonds); privately issued bank loans; equity securities; derivatives (e.g., credit default swap indices); asset-backed securities; and repurchase agreements. The fund also may lend its securities, and it may invest in various fixed-income securities and money market funds, including money market funds advised by the fund’s investment advisor, in order to manage its cash. The fund also may engage in active trading, which could reduce the returns of fund shareholders investing through a taxable account, and the fund may take temporary defensive positions that are inconsistent with its principal investment strategies.

Risk [Heading]

rr_RiskHeading

PRINCIPAL RISKS

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

It is possible to lose money by investing in the fund. 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.

• Risks Common to Funds Investing Principally in Debt Instruments.

• Interest Rate Risk—The risk that interest rates will rise, causing the value of the fund’s assets to fall.

• Credit Risk—The risk that an issuer, guarantor or liquidity provider of an instrument held by the fund will fail to make scheduled interest or principal payments, which may reduce the fund’s income and the market value of the instrument.

• Prepayment Risk (when repayment of principal occurs before scheduled maturity) and Extension Risk (when rates of repayment of principal are slower than expected)—Applicable primarily to mortgage-related securities, the risks that the underlying loan obligations may be refinanced (repaid) faster or slower than expected, causing the fund to invest repayment proceeds in, or continue to hold, lower yielding securities, as the case may be.

• Liquidity Risk—The risk that the fund may not be able to sell some or all of its securities at desired prices or may be unable to sell the securities at all, because of a lack of demand in the market for such securities, or a liquidity provider defaults on its obligation to purchase the securities when properly tendered by the fund.

• Non-Investment Grade Securities. Securities rated below investment grade (that is, below BBB by S&P or Baa by Moody’s) are regarded as predominantly speculative with respect to capacity to pay interest and repay principal in accordance with the terms of the obligation. High yield bonds generally are not as sensitive to interest rate changes as investment grade bonds.

• Rapid Changes in Interest Rates. Rapid changes in interest rates may cause significant requests to redeem fund shares, and possibly cause the fund to sell portfolio securities at a loss to satisfy those requests.

• Privately Negotiated Loans and Other Indebtedness. The fund may acquire interests in certain corporate loans and other forms of indebtedness that restrict the fund’s ability to sell those interests. As a result, the fund may not be able to sell those interests, or sell those interests for full value, when it otherwise may be advantageous to the fund to do so.

• Asset-Backed Securities. Defaults on the underlying assets of the asset-backed securities held by the fund may impair the value of an asset-backed security, and there may be limitations on the enforceability of any security interest granted with respect to those assets.

• Foreign Securities. To the extent the fund holds securities of foreign issuers, financial information concerning those issuers may be unavailable or more limited than information generally available from U.S. issuers, and it may have difficulty selling the securities or protecting its investment. Foreign securities also tend to be adversely affected by local or regional political and economic developments. Most of the foreign securities held by the fund are “Yankee” bonds, that is, U.S. dollar-denominated foreign bonds. The value of non-U.S. dollar denominated foreign bonds in which the fund may invest also may be subject to changes in exchange rates.

• Equities. To the extent the fund holds equities, the fund will be exposed to the risks inherent in equities. The share price of the fund may fall because of weakness in the stock markets, generally, weakness with respect to a particular industry in which it has significant holdings, or weakness associated with one or more specific companies in which the fund may have substantial investments. Moreover, the fund may not be able to sell some or all of its securities at desired prices.

• Derivatives. The fund’s investments in derivative instruments are subject to a number of risks, such as counterparty risk, the risk of mispricing or improper valuation, and the risk that the value of the instrument may not increase or decrease as expected.

Please refer to “Fund Objectives, Strategies and Risks” in the Prospectus for further details.

Risk Lose Money [Text]

rr_RiskLoseMoney

It is possible to lose money by investing in the fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

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.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

PERFORMANCE

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following bar chart shows how the fund’s performance has varied from year to year, and the table immediately below the chart shows the performance of the fund over the past 1-, 5- and 10-year periods, and over the life of the fund, and compares the fund’s performance to the performance of a broad-based securities market index. The bar chart and the table provide some indication of the risks of investing in the fund. Index returns do not reflect deductions for fees, taxes or expenses associated with investment in a fund. A fund’s past performance (both before and after taxes) is not necessarily an indication of how the fund will perform in the future. Current performance information for the fund is available toll free by calling (800) 647-7327 or by visiting our website at www.ssgafunds.com.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The following bar chart shows how the fund’s performance has varied from year to year, and the table immediately below the chart shows the performance of the fund over the past 1-, 5- and 10-year periods, and over the life of the fund, and compares the fund’s performance to the performance of a broad-based securities market index.

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

(800) 647-7327

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.ssgafunds.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

A fund’s past performance (both before and after taxes) is not necessarily an indication of how the fund will perform in the future.

Bar Chart [Heading]

rr_BarChartHeading

Annual Total Returns - SSgA High Yield Bond Fund

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

Highest Quarterly Results (2002-2011)	Lowest Quarterly Results (2002-2011)	Year-to- Date Ended
June 30, 2009: 16.46%	December 31, 2008: (17.13)%	September 30, 2012: 11.42%

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns
For the Periods Ending December 31, 2011:

Index No Deduction for Fees, Expenses, Taxes [Text]

rr_IndexNoDeductionForFeesExpensesTaxes

Index returns do not reflect deductions for fees, taxes or expenses associated with investment in a fund.

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

After-tax returns depend on an investor’s tax situation and may differ from those shown, and after-tax returns are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts (IRAs).

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

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

SSgA High Yield Bond Fund | Institutional

Risk/Return:

rr_RiskReturnAbstract

Shareholder Fees (fees paid directly from your investment)

rr_ShareholderFeeOther

none

Management Fee

rr_ManagementFeesOverAssets

0.30%

Distribution and Shareholder Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.24%

Other Expenses

rr_OtherExpensesOverAssets

0.34%

Acquired Fund Fee and Expenses (fees and expenses incurred indirectly by the fund as a result of an investment in shares of one or more acquired funds)

rr_AcquiredFundFeesAndExpensesOverAssets

0.02%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.90%

Less Fee Waivers and/or Expense Reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.13%)

^[1]

Total Annual Fund Operating Expenses After Fee Waivers and Expense Reimbursements

rr_NetExpensesOverAssets

0.77%

^[1]

1 year

rr_ExpenseExampleYear01

79

3 years

rr_ExpenseExampleYear03

274

5 years

rr_ExpenseExampleYear05

486

10 years

rr_ExpenseExampleYear10

1,096

2002

rr_AnnualReturn2002

2.18%

2003

rr_AnnualReturn2003

19.72%

2004

rr_AnnualReturn2004

8.98%

2005

rr_AnnualReturn2005

1.99%

2006

rr_AnnualReturn2006

8.38%

2007

rr_AnnualReturn2007

2.65%

2008

rr_AnnualReturn2008

(23.65%)

2009

rr_AnnualReturn2009

51.24%

2010

rr_AnnualReturn2010

15.27%

2011

rr_AnnualReturn2011

3.63%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Ended

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Sep. 30, 2012

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

11.42%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarterly Results (2002-2011)

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

16.46%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarterly Results (2002-2011)

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(17.13%)

1 Year

rr_AverageAnnualReturnYear01

3.63%

^[2]

5 Years

rr_AverageAnnualReturnYear05

7.20%

^[2]

10 Years

rr_AverageAnnualReturnYear10

7.63%

^[2]

SSgA High Yield Bond Fund | Return After Taxes on Distributions | Institutional

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

1.24%

^[2]

5 Years

rr_AverageAnnualReturnYear05

4.16%

^[2]

10 Years

rr_AverageAnnualReturnYear10

4.74%

^[2]

SSgA High Yield Bond Fund | Return After Taxes on Distributions and Sale of Fund Shares | Institutional

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

2.35%

^[2]

5 Years

rr_AverageAnnualReturnYear05

4.29%

^[2]

10 Years

rr_AverageAnnualReturnYear10

4.78%

^[2]

SSgA High Yield Bond Fund | Barclays Capital U.S. High-Yield 2% Issuer Capped Index (reflects no deduction for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

4.96%

^[2]

5 Years

rr_AverageAnnualReturnYear05

7.74%

^[2]

10 Years

rr_AverageAnnualReturnYear10

8.96%

^[2]

[1] The fund's investment advisor is contractually obligated until December 31, 2013 to waive its management fee and to reimburse the fund for expenses to the extent that total expenses (exclusive of non-recurring account fees, extraordinary expenses, and acquired fund fees) exceed 0.75% of average daily net assets on an annual basis. This waiver and reimbursement may not be terminated during the relevant period except with Board approval.

[2] The returns would have been lower without the contractual fee waiver and/or expense reimbursement.

XML

SSgA S&P 500 Index Fund

FUND SUMMARY SSgA S&P 500 INDEX FUND

INVESTMENT OBJECTIVE

SSgA S&P 500 Index Fund seeks to replicate as closely as possible, before expenses, the performance of the Standard & Poor’s® 500 Index.

FEES AND EXPENSES OF THE FUND

This table describes the fees and expenses that you may pay if you buy and hold shares of the fund. As a shareholder in the State Street Equity 500 Index Portfolio (the “Portfolio”), the fund bears and the table reflects its ratable share of the Portfolio’s expenses, including advisory and administrative fees, and at the same time continues to pay its own fees and expenses. The example below also reflects the expenses of both the fund and the Portfolio.

Shareholder Fees (USD $)	SSgA S&P 500 Index Fund Institutional
Shareholder Fees (fees paid directly from your investment)	none

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

Annual Fund Operating Expenses		SSgA S&P 500 Index Fund Institutional
Management Fee	[1]	0.045%
Distribution and Shareholder Service (12b-1) Fees		0.071%
Other Expenses		0.074%
Total Annual Fund Operating Expenses		0.19%
Less Fee Waivers and/or Expense Reimbursements	[2]	(0.01%)
Total Annual Fund Operating Expenses After Fee Waivers and Expense Reimbursements	[2]	0.18%

EXAMPLE

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, that all dividends and distributions are reinvested, and that the fund’s operating expenses remain the same. The calculation of costs for the one-year period takes into account the effect of any current contractual fee waivers and/or reimbursements; and the calculation of costs for the remaining periods takes such fee waivers and/or reimbursements into account only for the first year of the periods. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:

Expense Example (USD $)	1 year	3 years	5 years	10 years
SSgA S&P 500 Index Fund Institutional	18	60	106	242

PORTFOLIO TURNOVER

The fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). As a shareholder of the Portfolio, the fund bears its ratable share of the transaction costs associated with the portfolio turnover of the Portfolio. A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund 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 Portfolio’s turnover rate was 19% of the average value of its portfolio.

PRINCIPAL INVESTMENT STRATEGIES

There is no assurance that the fund will achieve its investment objective, and you could lose money by investing in the fund. SSgA S&P 500 Index Fund seeks to achieve its investment objective by investing substantially all of its assets in the Portfolio, the “master fund” that has the same investment objective as, and investment policies that are substantially similar to those of, the fund. This is commonly referred to as a “master/feeder” complex, with the fund serving as the “feeder” fund and the Portfolio serving as the “master” fund. The Portfolio uses a passive management strategy designed to track the performance of the S&P 500. The Index is a well-known stock market index that includes common stocks of 500 companies from a number of sectors representing a significant portion of the market value of all stocks publicly traded in the United States.

The Portfolio is not managed according to traditional methods of “active” investment management, which involve the buying and selling of securities based upon economic, financial and market analysis and investment judgment. Instead, the Portfolio, using a “passive” or “indexing” investment approach, attempts to replicate, before expenses, the performance of the S&P 500.

Under normal market conditions, the Portfolio will not invest less than 80% of its total assets in stocks in the Index. The fund attempts to replicate the investment performance of the S&P 500 Index and generally intends to invest, via the Portfolio, in all 500 stocks comprising the S&P 500 in approximate proportion to their weightings in the Index. However, it may not be possible or practicable to purchase all 500 stocks of the S&P 500 Index in those weightings. When it is not possible or practicable to purchase all 500 stocks of the S&P 500 Index in those weightings, the Portfolio may purchase a representative sample of the stocks listed in the S&P 500 Index in proportion expected by the investment advisor to match generally the performance of the Index as a whole. In addition, from time to time stocks are added to or removed from the Index. The Portfolio may sell securities that are represented in the Index, or purchase securities that are not yet represented in the Index, in anticipation of their removal from or addition to the Index. Shareholders will receive 60 days’ notice prior to a change in the 80% investment policy.

In addition to common stocks in the S&P 500 Index, the Portfolio may at times purchase or sell futures contracts on the Index, or options on those futures, in lieu of investing directly in the stocks making up the Index. The Portfolio might do so, for example, in order to increase its investment exposure pending investment of cash in the stocks comprising the Index. Alternatively, the Portfolio might use futures or options on futures to reduce its investment exposure in situations where it intends to sell a portion of the stocks in its portfolio but the sale has not yet been completed. The Portfolio may also enter into other derivatives transactions, including the use of options or swap transactions, to assist in attempting to replicate the performance of the Index. The Portfolio may also, to the extent permitted by applicable law, invest in shares of other mutual funds whose investment objectives and policies are similar to those of the Portfolio.

PRINCIPAL RISKS

It is possible to lose money by investing in the fund. 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.

• Risks Common to Funds Investing Principally in Equity Securities.

• Market, Industry and Specific Holdings—The share price of the fund may fall because of weakness in the stock markets, generally, weaknesses with respect to a particular industry in which the fund has significant holdings, or weaknesses associated with one or more specific companies in which the fund may have substantial investments.

• Index Tracking Risk. The Portfolio’s return may not match the return of the Index for a number of reasons. For example, the return on the securities and other investments selected by the investment advisor may not correlate precisely with the return on the Index. The Portfolio incurs a number of operating expenses not applicable to the Index, and incurs costs in buying and selling securities. The Portfolio may not be fully invested at times, either as a result of cash flows into or out of the Portfolio or reserves of cash held by the Portfolio to meet redemptions. The return on the sample of securities purchased by the Portfolio, or futures or other derivative positions taken by the Portfolio, to replicate the performance of the Index may not correlate precisely with the return of the Index.

• Large-Capitalization Securities. Because the S&P 500 includes mainly large U.S. companies, the Portfolio’s emphasis on securities issued by large capitalization companies makes it susceptible to the risks of investing in larger companies. Large-capitalization companies usually cannot respond as quickly as smaller companies to competitive challenges, and their growth rates tend to lag the growth rates of well-managed smaller companies during strong economic periods.

• Master/Feeder Structure Risk. The ability of the fund to meet its investment objective and redeem investors is directly related to the ability of the master fund to meet its objective and redeem fund interests in the master fund. The ability of the fund to meet its objective may be adversely affected by the purchase and redemption activities of other investors in the Portfolio. SSgA Funds Management, Inc., the fund’s investment advisor, also serves as investment advisor to the Portfolio. For example, the investment advisor may have an economic incentive to maintain the fund’s investment in the Portfolio at a time when it might otherwise choose not to do so. The trustees and officers of the fund will consider any conflict between the fund and the Portfolio and take such actions as they deem appropriate.

• Derivatives. The Portfolio’s investments in derivative instruments are subject to a number of risks, such as counterparty risk, the risk of mispricing or improper valuation, and the risk that the value of the instrument may not increase or decrease as expected. Derivative transactions typically involve leverage and may be highly volatile. It is possible that a derivative transaction will result in a loss greater than the principal amount invested, and the Portfolio may not be able to close out a derivative transaction at a favorable time or price.

• Passive Strategy/Index Risk. The Portfolio is managed with a passive investment strategy, attempting to track the performance of an unmanaged index of securities. This differs from an actively managed fund, which typically seeks to outperform a benchmark index. As a result, the Portfolio may hold constituent securities of the S&P 500 regardless of the current or projected performance of a specific security or a particular industry or market sector. Maintaining investments in securities regardless of market conditions or the performance of individual securities could cause the Portfolio’s return to be lower than if the Portfolio employed an active strategy.

Please refer to “Fund Objectives, Strategies and Risks” in the Prospectus for further details.

PERFORMANCE

The following bar chart shows how the fund’s performance has varied from year to year, and the table immediately below the chart shows the performance of the fund over the past 1-, 5- and 10-year periods, and over the life of the fund, and compares the fund’s performance to the performance of a broad-based securities market index. The bar chart and the table provide some indication of the risks of investing in the fund. Index returns do not reflect deductions for fees, taxes or expenses associated with investment in a fund. A fund’s past performance (both before and after taxes) is not necessarily an indication of how the fund will perform in the future. Current performance information for the fund is available toll free by calling (800) 647-7327 or by visiting our website at www.ssgafunds.com.

Annual Total Returns - SSgA S&P 500 Index Fund

Highest Quarterly Results(2002-2011)	Lowest Quarterly Results(2002-2011)	Year-to- Date Ended
June 30, 2009: 15.84%	December 31, 2008: (21.89)%	September 30, 2012: 16.53%

Average Annual Total Returns for the Periods Ending December 31, 2011:

Average Annual Total Returns SSgA S&P 500 Index Fund		1 Year	5 Years	10 Years
Institutional	[1]	1.86%	(0.39%)	2.76%
Institutional Return After Taxes on Distributions	[1]	1.17%	(0.77%)	2.40%
Institutional Return After Taxes on Distributions and Sale of Fund Shares	[1]	1.21%	(0.44%)	2.27%
S&P 500® Index (reflects no deduction for fees, expenses or taxes)	[1]	2.11%	(0.25%)	2.92%

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

[1] Amounts reflect the total expenses of the Portfolio and the fund.

[2] The fund’s investment advisor is contractually obligated until December 31, 2013 to reimburse the fund for expenses to the extent that total expenses (exclusive of non-recurring account fees, extraordinary expenses and acquired fund fees) exceed 0.18% of average daily net assets on an annual basis. This waiver and reimbursement may not be terminated during the relevant period except with Board approval.

[1] The returns would have been lower without the contractual fee waiver and/or expense reimbursement.

XML

Document and Entity Information	12 Months Ended
	Dec. 14, 2012
Risk/Return:
Document Type	485BPOS
Document Period End Date	Aug. 31, 2012
Registrant Name	SSGA FUNDS
Central Index Key	0000826686
Amendment Flag	false
Document Creation Date	Dec. 14, 2012
Document Effective Date	Dec. 14, 2012
Prospectus Date	Dec. 14, 2012

XML

SSgA Intermediate Fund

FUND SUMMARY SSgA INTERMEDIATE FUND

INVESTMENT OBJECTIVE

SSgA Intermediate Fund seeks a high level of current income while preserving principal by investing primarily in a diversified portfolio of debt securities with a dollar-weighted average maturity between three and ten years.

FEES AND EXPENSES OF THE FUND

This table describes the fees and expenses that you may pay if you buy and hold shares of the fund.

Shareholder Fees (USD $)	SSgA Intermediate Fund Institutional
Shareholder Fees (fees paid directly from your investment)	none

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

Annual Fund Operating Expenses		SSgA Intermediate Fund Institutional
Management Fee		0.30%
Distribution and Shareholder Service (12b-1) Fees		0.24%
Other Expenses		0.58%
Total Annual Fund Operating Expenses		1.12%
Less Fee Waivers and/or Expense Reimbursements	[1]	(0.52%)
Total Annual Fund Operating Expenses After Fee Waivers and Expense Reimbursements	[1]	0.60%

EXAMPLE

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, that all dividends and distributions are reinvested, and that the fund’s operating expenses remain the same. The calculation of costs for the one-year period takes into account the effect of any current contractual fee waivers and/or reimbursements; and the calculation of costs for the remaining periods takes such fee waivers and/or reimbursements into account only for the first year of the periods. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:

Expense Example (USD $)	1 year	3 years	5 years	10 years
SSgA Intermediate Fund Institutional	61	304	567	1,317

PORTFOLIO TURNOVER

The fund pays transaction costs, typically reflected in a bond’s purchase or sale price, 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 fund 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 turnover rate was 194% of the average value of its portfolio.

PRINCIPAL INVESTMENT STRATEGIES

SSgA Intermediate Fund attempts to meet its objective by investing at least 80% of its net assets (plus borrowings, if any) in debt instruments with dollar-weighted average maturities of between three and ten years. The fund’s portfolio typically consists of a core portfolio principally drawn from securities in the Barclays Capital U.S. Intermediate Government/Credit Bond Index, the fund’s benchmark, as well as other securities that have been selected to overweight or underweight certain securities, industries and sectors represented in the benchmark. The fund also manages its duration (that is, the sensitivity of the fund’s portfolio as a whole to interest rate changes) generally by investing in futures and primarily to correspond to the benchmark.

The fund invests primarily in investment grade debt instruments. Many of those instruments are instruments issued or guaranteed as to principal and interest by the U.S. government or its agencies and instrumentalities, obligations of U.S. and foreign corporations (e.g., “Yankee” bonds), including public utilities; obligations of U.S. and foreign financial institutions; repurchase agreements collateralized with high quality securities and other assets; derivatives, including swaps, futures and options; and asset-backed securities, including asset-backed commercial paper and mortgage-related securities. Such instruments typically are denominated in U.S. dollars. The fund may buy or sell securities on a forward-commitment, delayed-delivery or when-issued basis. These transactions involve the purchase or sale of securities by a fund at an established price with payment or delivery taking place in the future. The fund also may lend its securities, and it may invest in various fixed-income securities and money market funds, including money market funds advised by the fund’s investment advisor, in order to manage its cash. The fund also may engage in active trading, which could reduce the returns of fund shareholders investing through a taxable account, and the fund may take temporary defensive positions that are inconsistent with its principal investment strategies.

PRINCIPAL RISKS

It is possible to lose money by investing in the fund. 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.

• Risks Common to Funds Investing Principally in Debt Instruments.

• Interest Rate Risk—The risk that interest rates will rise, causing the value of the fund’s assets to fall.

• Credit Risk—The risk that an issuer, guarantor or liquidity provider of an instrument held by the fund will fail to make scheduled interest or principal payments, which may reduce the fund’s income and the market value of the instrument.

• Prepayment Risk (when repayment of principal occurs before scheduled maturity) and Extension Risk (when rates of repayment of principal are slower than expected)—Applicable primarily to mortgage-related securities, the risks that the underlying loan obligations may be refinanced (repaid) faster or slower than expected, causing the fund to invest repayment proceeds in, or continue to hold, lower yielding securities, as the case may be.

• Liquidity Risk—The risk that the fund may not be able to sell some or all of its securities at desired prices or may be unable to sell the securities at all, because of a lack of demand in the market for such securities, or a liquidity provider defaults on its obligation to purchase the securities when properly tendered by the fund.

• Rapid Changes in Interest Rates. Rapid changes in interest rates may cause significant requests to redeem fund shares, and possibly cause the fund to sell portfolio securities at a loss to satisfy those requests.

• Significant Exposure to U.S. Government Agencies and Financial Institutions. Events that would adversely affect the market prices of securities issued or guaranteed by one government agency may adversely affect the market price of securities issued or guaranteed by other government agencies. Similarly, events that would affect the market value of instruments issued by one financial institution, including repurchase agreements, may adversely affect the market value of instruments issued by similarly situated financial institutions.

• Mortgage-Related and Other Asset-Backed Securities. Defaults on the underlying assets of the mortgage-related and other asset-backed securities held by the fund may impair the value of those securities, and there may be limitations on the enforceability of any security interest granted with respect to those assets. These securities also present a higher degree of prepayment risk and extension risk than do other types of fixed income securities.

• Foreign Securities. To the extent the fund holds securities of foreign issuers, financial information concerning those issuers may be unavailable or more limited than information generally available from U.S. issuers, and it may have difficulty selling the securities or protecting its investment. Foreign securities also tend to be adversely affected by local or regional political and economic developments. Most of the foreign securities held by the fund are “Yankee” bonds, that is, U.S. dollar-denominated foreign bonds. The value of non-U.S. dollar denominated foreign bonds in which the fund may invest also may be subject to changes in exchange rates.

• Derivatives. The fund’s investments in derivative instruments are subject to a number of risks, such as counterparty risk, the risk of mispricing or improper valuation, and the risk that the value of the instrument may not increase or decrease as expected.

• Forward-Commitment, When-Issued and Delayed-Delivery Securities. Forward-commitment, delayed-delivery and when-issued transactions involve a risk of loss if the value of the security to be purchased or sold by the fund increases or decreases below the repurchase price of those securities or the other party to the transaction fails to complete the transaction.

Please refer to “Fund Objectives, Strategies and Risks” in the Prospectus for further details.

PERFORMANCE

The following bar chart shows how the fund’s performance has varied from year to year, and the table immediately below the chart shows the performance of the fund over the past 1-, 5- and 10-year periods, and over the life of the fund, and compares the fund’s performance to the performance of a broad-based securities market index. The bar chart and the table provide some indication of the risks of investing in the fund. Index returns do not reflect deductions for fees, taxes or expenses associated with investment in a fund. A fund’s past performance (both before and after taxes) is not necessarily an indication of how the fund will perform in the future. Current performance information for the fund is available toll free by calling (800) 647-7327 or by visiting our website at www.ssgafunds.com.

Annual Total Returns - SSgA Intermediate Fund

Highest Quarterly Results (2002-2011)	Lowest Quarterly Results (2002-2011)	Year-to- Date Ended
September 30, 2002: 4.54%	September 30, 2007: (2.96)%	September 30, 2012: 3.66%

Average Annual Total Returns
For the Periods Ending December 31, 2011:

Average Annual Total Returns SSgA Intermediate Fund		1 Year	5 Years	10 Years
Institutional	[1]	4.84%	2.41%	3.17%
Institutional Return After Taxes on Distributions	[1]	4.05%	1.24%	1.83%
Institutional Return After Taxes on Distributions and Sale of Fund Shares	[1]	3.14%	1.36%	1.92%
Barclays Capital U.S. Intermediate Government/Credit Bond Index (reflects no deduction for fees, expenses or taxes)	[1]	5.80%	5.88%	5.20%

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

[1] The fund's investment advisor is contractually obligated until December 31, 2013 to waive its management fee and to reimburse the fund for expenses to the extent that total expenses (exclusive of non-recurring account fees, extraordinary expenses and acquired fund fees) exceed 0.60% of average daily net assets on an annual basis. This waiver and reimbursement may not be terminated during the relevant period except with Board approval.

[1] The returns would have been lower without the contractual fee waiver and/or expense reimbursement.

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

SSGA FUNDS

Prospectus Date

rr_ProspectusDate

Dec. 14, 2012

SSgA U.S. Government Money Market Fund

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

FUND SUMMARY SSgA U.S. GOVERNMENT MONEY MARKET FUND

Objective [Heading]

rr_ObjectiveHeading

INVESTMENT OBJECTIVE

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

SSgA U.S. Government Money Market Fund seeks to maximize current income, to the extent consistent with the preservation of capital and liquidity and the maintenance of a stable $1.00 per share net asset value, by investing in obligations of the U.S. government or its instrumentalities with remaining maturities of one year or less.

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.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder Fees
     (fees paid directly from your investment)

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)

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 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, that all dividends and distributions are reinvested, and that the fund’s operating expenses remain the same. The calculation of costs for the one-year period takes into account the effect of any current contractual fee waivers and/or reimbursements; and the calculation of costs for the remaining periods takes such fee waivers and/or reimbursements into account only for the first year of the periods. 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

SSgA U.S. Government Money Market Fund typically invests at least 80% of its net assets (plus borrowings, if any) in instruments issued or guaranteed as to principal and interest by the U.S. government or its agencies and instrumentalities, as well as repurchase agreements secured by such instruments. These instruments may bear fixed, variable or floating rates of interest or may be zero coupon securities. The fund may make significant investments in certain mortgage-related securities, including obligations of the Federal Home Loan Mortgage Corporation, the Federal National Mortgage Association and the Federal Home Loan Bank, that are neither insured nor guaranteed by the U.S. Treasury. The fund will not invest more than 5% of its net assets (taken at current market value) in repurchase agreements maturing in more than seven days.

The fund follows a disciplined investment process that attempts to provide stability of principal, liquidity and current income through all market conditions by investing in high quality money market instruments. The fund invests in accordance with regulatory requirements applicable to money market funds, which impose strict conditions on the quality of portfolio securities, the maturity of individual securities and the portfolio as a whole, and portfolio diversification.

Risk [Heading]

rr_RiskHeading

PRINCIPAL RISKS

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Although the fund seeks to preserve the value of your investment at $1.00 per share, it is possible to lose money by investing in the fund.

• Risks Common to Funds Investing Principally in Debt Instruments.

• Interest Rate Risk—The risk that interest rates will rise, causing the value of the fund’s assets to fall.

• Credit Risk—The risk that an issuer, guarantor or liquidity provider of an instrument held by the fund will fail to make scheduled interest or principal payments, which may reduce the fund’s income and the market value of the instrument.

• Prepayment Risk (when repayment of principal occurs before scheduled maturity) and Extension Risk (when rates of repayment of principal are slower than expected)—Applicable primarily to mortgage-related securities, the risks that the underlying loan obligations may be refinanced (repaid) faster or slower than expected, causing the fund to invest repayment proceeds in, or continue to hold, lower yielding securities, as the case may be.

• Liquidity Risk—The risk that the fund may not be able to sell some or all of its securities at desired prices or may be unable to sell the securities at all, because of a lack of demand in the market for such securities, or a liquidity provider defaults on its obligation to purchase the securities when properly tendered by the fund.

• Government Securities. Securities of certain U.S. government agencies and instrumentalities are not guaranteed by the U.S. Treasury, and the fund must look principally to the agency or instrumentality issuing or guaranteeing the securities for repayment.

• Significant Exposure to U.S. Government Agencies and Financial Institutions. Events that would adversely affect the market prices of securities issued or guaranteed by one government agency may adversely affect the market price of securities issued or guaranteed by other government agencies. Similarly, events that would affect the market value of instruments issued by one financial institution, including repurchase agreements, may adversely affect the market value of instruments issued by similarly situated financial institutions.

• Risk Associated with Maintaining a Stable Share Price. To the extent that the aggregate market value of the fund’s assets materially varies from the aggregate of the acquisition prices of those assets, the fund may not be able to maintain a stable share price of $1.00. This risk typically is higher during periods of rapidly changing interest rates or when issuer credit quality generally is falling, and is made worse when the fund experiences significant redemption requests.

• Rapid Changes in Interest Rates. Rapid changes in interest rates may cause significant requests to redeem fund shares, and possibly cause the fund to sell portfolio securities at a loss to satisfy those requests.

• Low Short-Term Interest Rates. As short-term interest rates approach 0%, the fund may maintain substantial cash balances. The fund typically does not receive any income from uninvested cash. In addition, if the fund generates insufficient income to pay its expenses, it may not pay a daily dividend.

Please refer to “Fund Objectives, Strategies and Risks” in the Prospectus for further details.

Risk Money Market Fund [Text]

rr_RiskMoneyMarketFund

Although the fund seeks to preserve the value of your investment at $1.00 per share, it is possible to lose money by investing in the fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

PERFORMANCE

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following bar chart shows how the fund’s performance has varied from year to year, and the table immediately below the chart shows the performance of the fund over the past 1-, 5- and 10-year periods, and over the life of the fund. The bar chart and the table provide some indication of the risks of investing in the fund. A fund’s past performance (both before and after taxes) is not necessarily an indication of how the fund will perform in the future. Current performance information for the fund is available toll free by calling (800) 647-7327 or by visiting our website at www.ssgafunds.com.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The following bar chart shows how the fund’s performance has varied from year to year, and the table immediately below the chart shows the performance of the fund over the past 1-, 5- and 10-year periods, and over the life of the fund.

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

(800) 647-7327

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.ssgafunds.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

A fund’s past performance (both before and after taxes) is not necessarily an indication of how the fund will perform in the future.

Bar Chart [Heading]

rr_BarChartHeading

Annual Total Returns - SSgA U.S. Government Money Market Fund

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

Highest Quarterly Results (2002-2011)	Lowest Quarterly Results (2002-2011)	Year-to- Date Ended
December 31, 2006: 1.24%	December 31, 2011: 0.00%	September 30, 2012: 0.00%

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns
For the Periods Ending December 31, 2011:

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

To obtain the fund’s current 7-day yield, please call (800) 997-7327.

Money Market Seven Day Yield, Caption [Text]

rr_MoneyMarketSevenDayYieldCaption

To obtain the fund’s current 7-day yield

Money Market Seven Day Yield Phone

rr_MoneyMarketSevenDayYieldPhone

(800) 997-7327

SSgA U.S. Government Money Market Fund | Institutional

Risk/Return:

rr_RiskReturnAbstract

Shareholder Fees (fees paid directly from your investment)

rr_ShareholderFeeOther

none

Management Fee

rr_ManagementFeesOverAssets

0.25%

Distribution and Shareholder Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.08%

Other Expenses

rr_OtherExpensesOverAssets

0.06%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.39%

^[1]

1 year

rr_ExpenseExampleYear01

40

3 years

rr_ExpenseExampleYear03

125

5 years

rr_ExpenseExampleYear05

219

10 years

rr_ExpenseExampleYear10

493

2002

rr_AnnualReturn2002

1.49%

2003

rr_AnnualReturn2003

0.77%

2004

rr_AnnualReturn2004

0.96%

2005

rr_AnnualReturn2005

2.86%

2006

rr_AnnualReturn2006

4.69%

2007

rr_AnnualReturn2007

4.83%

2008

rr_AnnualReturn2008

1.98%

2009

rr_AnnualReturn2009

0.04%

2010

rr_AnnualReturn2010

0.00%

2011

rr_AnnualReturn2011

0.00%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to- Date Ended

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Sep. 30, 2012

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

0.00%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarterly Results (2002-2011)

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Dec. 31, 2006

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

1.24%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarterly Results (2002-2011)

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2011

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

0.00%

1 Year

rr_AverageAnnualReturnYear01

none

^[2]

5 Years

rr_AverageAnnualReturnYear05

1.35%

10 Years

rr_AverageAnnualReturnYear10

1.75%

[1] The fund's investment advisor may also voluntarily reduce all or a portion of its fees and/or reimburse expenses of the fund to the extent necessary to maintain a minimum net yield for the fund (the "Voluntary Reduction") which may vary from time to time in the investment advisor's sole discretion. The fund has agreed, subject to certain limitations, to reimburse its investment advisor for the full dollar amount of any Voluntary Reduction incurred after August 1, 2012. As of August 1, 2012, the fund's investment advisor waived fees and/or reimbursed expenses in the amount of $2,024,943 under the voluntary yield waiver. Any future reimbursement of previously waived fees by the fund to its investment advisor may cause the total fund annual operating expenses of the fund to exceed the expense limitation under the contractual expense limitation agreement. The investment advisor may, in its sole discretion, irrevocably waive receipt of any or all reimbursement amounts due from the fund, without limitation. Total Annual Fund Operating Expenses may be higher than the fund's ratio of expenses to average net assets shown in the Financial Highlights, which reflect the operating expenses of the fund including voluntary waivers.

[2] The returns would have been lower without the voluntary management fee waiver and/or expense reimbursement.

XML

SSgA Bond Market Fund

FUND SUMMARY SSgA BOND MARKET FUND

INVESTMENT OBJECTIVE

SSgA Bond Market Fund seeks to maximize total return by investing in fixed income securities, including, but not limited to, those represented by the Barclays Capital U.S. Aggregate Bond Index.

FEES AND EXPENSES OF THE FUND

This table describes the fees and expenses that you may pay if you buy and hold shares of the fund.

Shareholder Fees (USD $)	SSgA Bond Market Fund Institutional
Shareholder Fees (fees paid directly from your investment)	none

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

Annual Fund Operating Expenses		SSgA Bond Market Fund Institutional
Management Fee		0.30%
Distribution and Shareholder Service (12b-1) Fees		0.07%
Other Expenses		0.90%
Acquired Fund Fee and Expenses (fees and expenses incurred indirectly by the fund as a result of an investment in shares of one or more acquired funds)		0.01%
Total Annual Fund Operating Expenses		1.28%
Less Fee Waivers and/or Expense Reimbursements	[1]	(0.77%)
Total Annual Fund Operating Expenses After Fee Waivers and Expense Reimbursements	[1]	0.51%

EXAMPLE

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, that all dividends and distributions are reinvested, and that the fund’s operating expenses remain the same. The calculation of costs for the one-year period takes into account the effect of any current contractual fee waivers and/or reimbursements; and the calculation of costs for the remaining periods takes such fee waivers and/or reimbursements into account only for the first year of the periods. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:

Expense Example (USD $)	1 year	3 years	5 years	10 years
SSgA Bond Market Fund Institutional	52	330	628	1,477

PORTFOLIO TURNOVER

The fund pays transaction costs, typically reflected in a bond’s purchase or sale price, 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 fund 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 turnover rate was 205% of the average value of its portfolio.

PRINCIPAL INVESTMENT STRATEGIES

SSgA Bond Market Fund attempts to meet its objective by investing at least 80% of its net assets (plus borrowings, if any) in debt instruments. The fund’s portfolio typically consists of a core portfolio principally drawn from, and that is intended to reflect the overall risk characteristics of, the securities in the Barclays Capital U.S. Aggregate Bond Index, the fund’s benchmark. The fund then selects other securities, which may be securities inside or outside of the benchmark, to overweight or underweight certain industries and sectors represented in the benchmark. The fund also manages its duration (that is, the sensitivity of the fund’s portfolio as a whole to interest rate changes) generally by investing in futures and primarily to correspond to the benchmark. The fund actively trades its portfolio holdings in an effort to benefit from short-term yield disparities among different issues of fixed income securities, or otherwise to increase total return to the fund.

The fund invests primarily in investment grade debt instruments. Many of those instruments are instruments issued or guaranteed as to principal and interest by the U.S. government or its agencies and instrumentalities, obligations of U.S. and foreign corporations (e.g., “Yankee” bonds), including public utilities; obligations of U.S. and foreign financial institutions; repurchase agreements collateralized with high quality securities and other assets; derivatives, including swaps, futures and options; and asset-backed securities, including asset-backed commercial paper and mortgage-related securities. Such instruments typically are denominated in U.S. dollars. The fund may also invest in high yield bonds commonly referred to as “junk bonds.” High yield bonds, and to a lesser extent other types of bonds, may be purchased at a discount to their face value and thereby provide opportunities to the fund for capital appreciation. The fund may buy or sell securities on a forward commitment, delayed-delivery or when-issued basis. These transactions involve the purchase or sale of securities by a fund at an established price with payment or delivery taking place in the future. The fund also may lend its securities, and it may invest in various fixed-income securities and money market funds, including money market funds advised by the fund’s investment advisor, in order to manage its cash. The fund also may engage in active trading, which could reduce the returns of fund shareholders investing through a taxable account, and the fund may take temporary defensive positions that are inconsistent with its principal investment strategies.

PRINCIPAL RISKS

It is possible to lose money by investing in the fund. 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.

• Risks Common to Funds Investing Principally in Debt Instruments.

• Interest Rate Risk—The risk that interest rates will rise, causing the value of the fund’s assets to fall.

• Credit Risk—The risk that an issuer, guarantor or liquidity provider of an instrument held by the fund will fail to make scheduled interest or principal payments, which may reduce the fund’s income and the market value of the instrument.

• Prepayment Risk (when repayment of principal occurs before scheduled maturity) and Extension Risk (when rates of repayment of principal are slower than expected)—Applicable primarily to mortgage-related securities, the risks that the underlying loan obligations may be refinanced (repaid) faster or slower than expected, causing the fund to invest repayment proceeds in, or continue to hold, lower yielding securities, as the case may be.

• Liquidity Risk—The risk that the fund may not be able to sell some or all of its securities at desired prices or may be unable to sell the securities at all, because of a lack of demand in the market for such securities, or a liquidity provider defaults on its obligation to purchase the securities when properly tendered by the fund.

• Rapid Changes in Interest Rates. Rapid changes in interest rates may cause significant requests to redeem fund shares, and possibly cause the fund to sell portfolio securities at a loss to satisfy those requests.

• Significant Exposure to U.S. Government Agencies and Financial Institutions. Events that would adversely affect the market prices of securities issued or guaranteed by one government agency may adversely affect the market price of securities issued or guaranteed by other government agencies. Similarly, events that would affect the market value of instruments issued by one financial institution, including repurchase agreements, may adversely affect the market value of instruments issued by similarly situated financial institutions.

• Mortgage-Related and Other Asset-Backed Securities. Defaults on the underlying assets of the mortgage-related and other asset-backed securities held by the fund may impair the value of those securities, and there may be limitations on the enforceability of any security interest granted with respect to those assets. These securities also present a higher degree of prepayment risk and extension risk than do other types of fixed income securities.

• Non-Investment Grade Securities. Securities rated below investment grade (that is, below BBB by S&P or Baa by Moody’s) are regarded as predominantly speculative with respect to capacity to pay interest and repay principal in accordance with the terms of the obligation. High yield bonds generally are not as sensitive to interest rate changes as investment grade bonds.

• Foreign Securities. To the extent the fund holds securities of foreign issuers, financial information concerning those issuers may be unavailable or more limited than information generally available from U.S. issuers, and it may have difficulty selling the securities or protecting its investment. Foreign securities also tend to be adversely affected by local or regional political and economic developments. Most of the foreign securities held by the fund are “Yankee” bonds, that is, U.S. dollar-denominated foreign bonds. The value of non-U.S. dollar denominated foreign bonds in which the fund may invest also may be subject to changes in exchange rates.

• Derivatives. The fund’s investments in derivative instruments are subject to a number of risks, such as counterparty risk, the risk of mispricing or improper valuation, and the risk that the value of the instrument may not increase or decrease as expected.

• Forward-Commitment, When-Issued and Delayed-Delivery Securities. Forward-commitment, delayed-delivery and when-issued transactions involve a risk of loss if the value of the security to be purchased or sold by the fund increases or decreases below the repurchase price of those securities or the other party to the transaction fails to complete the transaction.

Please refer to “Fund Objectives, Strategies and Risks” in the Prospectus for further details.

PERFORMANCE

The following bar chart shows how the fund’s performance has varied from year to year, and the table immediately below the chart shows the performance of the fund over the past 1-, 5- and 10-year periods, and over the life of the fund, and compares the fund’s performance to the performance of a broad-based securities market index. The bar chart and the table provide some indication of the risks of investing in the fund. Index returns do not reflect deductions for fees, taxes or expenses associated with investment in a fund. A fund’s past performance (both before and after taxes) is not necessarily an indication of how the fund will perform in the future. Current performance information for the fund is available toll free by calling (800) 647-7327 or by visiting our website at www.ssgafunds.com.

Annual Total Returns - SSgA Bond Market Fund

Highest Quarterly Results (2002-2011)	Lowest Quarterly Results (2002-2011)	Year-to- Date Ended
September 30, 2002: 4.80%	December 31, 2007: (5.58)%	September 30, 2012: 4.51%

Average Annual Total Returns
For the Periods Ending December 31, 2011:

Average Annual Total Returns SSgA Bond Market Fund		1 Year	5 Years	10 Years
Institutional	[1]	6.76%	2.66%	3.66%
Institutional Return After Taxes on Distributions	[1]	5.54%	1.18%	2.03%
Institutional Return After Taxes on Distributions and Sale of Fund Shares	[1]	4.37%	1.38%	2.16%
Barclays Capital U.S. Aggregate Bond Index (reflects no deduction for fees, expenses or taxes)	[1]	7.84%	6.50%	5.78%

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

[1] The fund's investment advisor is contractually obligated until December 31, 2013 to waive its management fee and to reimburse the fund for expenses to the extent that total expenses (exclusive of non-recurring account fees, extraordinary expenses and acquired fund fees) exceed 0.50% of average daily net assets on an annual basis. This waiver and reimbursement may not be terminated during the relevant period except with Board approval.

[1] The returns would have been lower without the contractual fee waiver and/or expense reimbursement.

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

SSGA FUNDS

Prospectus Date

rr_ProspectusDate

Dec. 14, 2012

Institutional Shares | SSgA Emerging Markets Fund

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

FUND SUMMARY SSgA EMERGING MARKETS FUND

Objective [Heading]

rr_ObjectiveHeading

INVESTMENT OBJECTIVE

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

SSgA Emerging Markets Fund seeks to provide maximum total return, primarily through capital appreciation, by investing primarily in securities of foreign issuers.

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.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder Fees
     (fees paid directly from your investment)

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

December 31, 2013

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 may indicate higher transaction costs and may result in higher taxes when fund 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 turnover rate was 74% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

74.00%

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 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, that all dividends and distributions are reinvested, and that the fund’s operating expenses remain the same. The calculation of costs for the one-year period takes into account the effect of any current contractual fee waivers and/or reimbursements; and the calculation of costs for the remaining periods takes such fee waivers and/or reimbursements into account only for the first year of the periods. 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

The fund will invest at least 80% of its net assets (plus borrowings, if any) in equity securities issued by companies domiciled or doing a substantial portion of their business in countries determined by the fund’s advisor to have a developing or emerging economy or securities market. An emerging market is any market included in the MSCI Emerging Markets Index, the fund’s benchmark.

The fund’s advisor employs a proprietary quantitative model to assist in country and stock selection, which the advisor believes are the keys to achieving the fund’s objective. This model is intended to help determine the relative attractiveness of the countries and securities within the fund’s investment universe. In addition, the model assists the advisor in controlling the fund’s exposure to risks relative to the fund’s benchmark. The model is based on the historical relationships of certain economic and financial factors applicable to issuers and/or countries (such as measures of value, sentiment and share price momentum) to past performance. It allows the advisor to evaluate quickly each eligible security and then rank all eligible securities in the fund’s investment universe in the order of their attractiveness as fund investments. The advisor regularly reexamines the model and, when necessary, makes updates or adjustments to the economic and financial factors considered. The fund periodically rebalances its portfolio to reflect movements in the underlying factors. From time to time, the advisor will make a qualitative judgment to deviate from the model, but only if it believes that certain current information is not fully reflected in the model.

The fund may invest in common and preferred equity securities, publicly traded in the U.S. or in foreign countries in developed or emerging markets, securities convertible into common stocks, initial public offerings, equity swaps, equity futures, currency forwards, index swaps, structured equity notes, equity linked notes, American Depository Receipts and participation certificates.

The fund may use futures, forwards, swaps and certain other instruments to seek to generate returns. The fund’s use of futures, forwards, swaps and certain other instruments provides financial leverage. Through the use of leverage, the fund’s total investment exposure could far exceed the value of its portfolio holdings and its investment returns could depend upon the performance of equities and currencies that the fund does not own.

The fund also may lend its securities, and it may invest in various fixed-income securities and money market funds, including money market funds advised by the fund’s investment advisor, in order to manage its cash. The fund may take temporary defensive positions that are inconsistent with its principal investment strategies.

Risk [Heading]

rr_RiskHeading

PRINCIPAL RISKS

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

It is possible to lose money by investing in the fund. 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.

Investing in this fund may involve more risk, and consequently, the fund may have a more volatile share price, than a fund investing primarily in equity securities of large, established U.S. corporations.

• Risks Common to Funds Investing Principally in Equity Securities.

• Market, Industry and Specific Holdings—The share price of the fund may fall because of weakness in the stock markets, generally, weaknesses with respect to a particular industry in which the fund has significant holdings, or weaknesses associated with one or more specific companies in which the fund may have substantial investments.

• Liquidity Risk—The risk that the fund may not be able to sell some or all of its securities at desired prices or may be unable to sell the securities at all.

• Use of a Quantitative Strategy. A quantitative investment strategy generally is based on the assumption that the future performance of a specific security relative to other securities may be predicted based on the correlation of certain historical economic and financial factors to past performance. Over time, the correlation between these factors and performance may diminish, which may impair the fund’s ability to achieve its investment objective.

• Foreign Securities, including Emerging Market Securities. To the extent the fund holds securities of foreign issuers, financial information concerning those issuers may be unavailable or more limited than information generally available from U.S. issuers, and it may have difficulty selling the securities or protecting its investment. Foreign securities also tend to be adversely affected by local or regional political and economic developments, as well as changes in exchange rates, and the inconvertibility of local currency into U.S. dollars. For emerging market equity securities, these risks tend to be greater than for securities of issuers located in more developed countries.

• Sector. The fund may have significant investments in one or more specific industry sectors, subjecting it to risks greater than general market risk.

• American Depositary Receipts (ADRs) and Global Depositary Receipts (GDRs). ADRs and GDRs held by the fund have the same currency and economic risks as the underlying shares they represent, as well as the risks associated with foreign securities.

• Derivatives. Investments in a derivative instrument could lose more than the principal amount invested. Compared to conventional securities, derivatives can be more sensitive to changes in interest rates or to sudden fluctuations in market prices and thus a fund’s losses may be greater if it invests in derivatives than if it invests only in conventional securities. The use of derivative instruments involves risks different from, or possibly greater than, the risks associated with investing directly in equity or fixed income securities, currencies or other investments. Derivatives are subject to a number of risks such as liquidity risk, market risk, credit risk, default risk, counterparty risk and management risk. They also involve the risk of mispricing or improper valuation and the risk that changes in the value of the derivative may not correlate exactly with the change in the value of the underlying asset, rate or index.

• Futures Risk. The risk of loss in trading futures contracts in some strategies is potentially unlimited. The entire amount invested in futures contracts could be lost. There also is no assurance that a liquid secondary market will exist for futures contracts and options in which a fund may invest. Participation in the futures markets, as well as the use of various forward contracts, involves investment risks and transaction costs to which the fund would not be subject absent the use of these strategies. If the fund’s predictions of movements in the direction of the securities, fixed income or currencies markets are inaccurate, the adverse consequences to the fund may leave the fund in a worse position than if such strategies were not used.

• Forward Currency Contracts. The fund may engage in forward currency contracts to hedge against uncertainty in the level of future exchange rates or to effect investment transactions to generate returns consistent with the fund’s investment objective and strategies. A forward contract involves an obligation to purchase or sell a specific currency. Forward currency contracts are subject to the risk that should forward prices increase, a loss will be incurred to the extent that the price of the currency agreed to be purchased exceeds the price of the currency agreed to be sold.

• Swaps. A swap is a two-party contract that generally obligates one party to pay the positive return and the other party to pay the negative return on a specified reference security, basket of securities, security index or index component. Swaps can involve greater risks than direct investment in securities, because swaps may be leveraged and are subject to counterparty risk (e.g., the risk of a counterparty’s defaulting on the obligation or bankruptcy), credit risk and pricing risk (i.e., swaps may be difficult to value). Swaps may also be considered illiquid. It may not be possible for the Fund to liquidate a swap position at an advantageous time or price, which may result in significant losses.

• Participation Certificates. Participation certificates are issued by banks or broker-dealers and are designed to offer a return linked to a security, index of securities or other asset. Investments in participation certificates involve the same risks associated with a direct investment in the underlying foreign companies or foreign securities markets that they seek to replicate and are subject to counterparty risk.

Please refer to “Fund Objectives, Strategies and Risks” in the Prospectus for further details.

Risk Lose Money [Text]

rr_RiskLoseMoney

It is possible to lose money by investing in the fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

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.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

PERFORMANCE

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following bar chart shows how the fund’s performance has varied from year to year, and the table immediately below the chart shows the performance of the fund over the past 1-, 5- and 10-year periods, and over the life of the fund, and compares the fund’s performance to the performance of a broad-based securities market index. The bar chart and the table provide some indication of the risks of investing in the fund. Index returns do not reflect deductions for fees, taxes or expenses associated with investment in a fund. A fund’s past performance (both before and after taxes) is not necessarily an indication of how the fund will perform in the future. Current performance information for the fund is available toll free by calling (800) 647-7327 or by visiting our website at www.ssgafunds.com.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The following bar chart shows how the fund’s performance has varied from year to year, and the table immediately below the chart shows the performance of the fund over the past 1-, 5- and 10-year periods, and over the life of the fund, and compares the fund’s performance to the performance of a broad-based securities market index.

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

(800) 647-7327

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.ssgafunds.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

A fund’s past performance (both before and after taxes) is not necessarily an indication of how the fund will perform in the future.

Bar Chart [Heading]

rr_BarChartHeading

Annual Total Returns - SSgA Emerging Markets Fund

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

Highest Quarterly Results (2002-2011)	Lowest Quarterly Results (2002-2011)	Year-to- Date Ended
June 30, 2009: 31.26%	September 30, 2008: (29.94)%	September 30, 2012: 9.06%

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns
For the Periods Ending December 31, 2011:

Index No Deduction for Fees, Expenses, Taxes [Text]

rr_IndexNoDeductionForFeesExpensesTaxes

Index returns do not reflect deductions for fees, taxes or expenses associated with investment in a fund.

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

After-tax returns depend on an investor’s tax situation and may differ from those shown, and after-tax returns are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts (IRAs).

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

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

Institutional Shares | SSgA Emerging Markets Fund | Institutional

Risk/Return:

rr_RiskReturnAbstract

Shareholder Fees (fees paid directly from your investment)

rr_ShareholderFeeOther

none

Management Fee

rr_ManagementFeesOverAssets

0.75%

Distribution and Shareholder Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other Expenses

rr_OtherExpensesOverAssets

0.28%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.28%

Less Fee Waivers and/or Expense Reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.03%)

^[1]

Total Annual Fund Operating Expenses After Fee Waivers and Expense Reimbursements

rr_NetExpensesOverAssets

1.25%

^[1]

1 year

rr_ExpenseExampleYear01

127

3 years

rr_ExpenseExampleYear03

403

5 years

rr_ExpenseExampleYear05

699

10 years

rr_ExpenseExampleYear10

1,543

2002

rr_AnnualReturn2002

(5.03%)

2003

rr_AnnualReturn2003

53.97%

2004

rr_AnnualReturn2004

24.67%

2005

rr_AnnualReturn2005

37.28%

2006

rr_AnnualReturn2006

33.46%

2007

rr_AnnualReturn2007

40.96%

2008

rr_AnnualReturn2008

(56.33%)

2009

rr_AnnualReturn2009

70.25%

2010

rr_AnnualReturn2010

19.58%

2011

rr_AnnualReturn2011

(19.00%)

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Ended

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Sep. 30, 2012

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

9.06%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarterly Results (2002-2011)

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

31.26%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarterly Results (2002-2011)

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Sep. 30, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(29.94%)

1 Year

rr_AverageAnnualReturnYear01

(19.00%)

5 Years

rr_AverageAnnualReturnYear05

0.30%

^[2]

10 Years

rr_AverageAnnualReturnYear10

12.99%

^[2]

Institutional Shares | SSgA Emerging Markets Fund | Return After Taxes on Distributions | Institutional

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(19.45%)

5 Years

rr_AverageAnnualReturnYear05

(0.54%)

^[2]

10 Years

rr_AverageAnnualReturnYear10

12.24%

^[2]

Institutional Shares | SSgA Emerging Markets Fund | Return After Taxes on Distributions and Sale of Fund Shares | Institutional

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(12.35%)

5 Years

rr_AverageAnnualReturnYear05

0.19%

^[2]

10 Years

rr_AverageAnnualReturnYear10

11.68%

^[2]

Institutional Shares | SSgA Emerging Markets Fund | MSCI® Emerging Markets Index (Gross) (reflects no deduction for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(18.17%)

5 Years

rr_AverageAnnualReturnYear05

2.70%

^[2]

10 Years

rr_AverageAnnualReturnYear10

14.20%

^[2]

Institutional Shares | SSgA Emerging Markets Fund | MSCI® Emerging Markets Index (Net) (reflects no deduction for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(18.42%)

5 Years

rr_AverageAnnualReturnYear05

2.40%

^[2]

10 Years

rr_AverageAnnualReturnYear10

13.86%

^[2]

[1] The fund's investment advisor is contractually obligated until December 31, 2013 to waive its management fee and to reimburse the fund for expenses to the extent that total expenses (exclusive of non-recurring account fees, extraordinary expenses, and acquired fund fee and expenses) exceed 1.25% of average daily net assets on an annual basis. This waiver and reimbursement may not be terminated during the relevant period except with Board approval.

[2] The returns would have been lower without the contractual fee waiver and/or expense reimbursement.

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

SSGA FUNDS

Prospectus Date

rr_ProspectusDate

Dec. 14, 2012

SSgA Prime Money Market Fund

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

FUND SUMMARY SSgA PRIME MONEY MARKET FUND

Objective [Heading]

rr_ObjectiveHeading

INVESTMENT OBJECTIVE

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

SSgA Prime Money Market Fund seeks to maximize current income, to the extent consistent with the preservation of capital and liquidity and the maintenance of a stable $1.00 per share net asset value, by investing in dollar denominated securities.

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.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder Fees
     (fees paid directly from your investment)

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

December 31, 2013

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 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, that all dividends and distributions are reinvested, and that the fund’s operating expenses remain the same. The calculation of costs for the one-year period takes into account the effect of any current contractual fee waivers and/or reimbursements; and the calculation of costs for the remaining periods takes such fee waivers and/or reimbursements into account only for the first year of the periods. 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

SSgA Prime Money Market Fund follows a disciplined investment process in which the fund’s investment advisor bases its decisions on the relative attractiveness of different money market instruments. In the advisor’s opinion, the attractiveness of an instrument may vary depending on the general level of interest rates, as well as imbalances of supply and demand in the market. The fund invests in accordance with regulatory requirements applicable to money market funds, which impose strict conditions on the quality of portfolio securities, liquidity of portfolio holdings, the maturity of individual securities and the portfolio as a whole, and portfolio diversification.

The fund attempts to meet its investment objective by investing in a broad range of money market instruments. The fund considers the following instruments or investment strategies to be principal to the achievement of its investment objective: U.S. government securities, including U.S. Treasury bills, notes and bonds and securities issued or guaranteed by U.S. government agencies; certificates of deposits and time deposits of U.S. and foreign banks; commercial paper and other high quality obligations of U.S. or foreign companies; asset-backed securities, including asset-backed commercial paper; and repurchase agreements. These instruments may bear fixed, variable or floating rates of interest or may be zero coupon securities. The fund also may invest in shares of other money market funds, including funds advised by the fund’s investment advisor.

Risk [Heading]

rr_RiskHeading

PRINCIPAL RISKS

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Although the fund seeks to preserve the value of your investment at $1.00 per share, it is possible to lose money by investing in the fund.

• Risks Common to Funds Investing Principally in Debt Instruments.

• Interest Rate Risk—The risk that interest rates will rise, causing the value of the fund’s assets to fall.

• Credit Risk—The risk that an issuer, guarantor or liquidity provider of an instrument held by the fund will fail to make scheduled interest or principal payments, which may reduce the fund’s income and the market value of the instrument.

• Prepayment Risk (when repayment of principal occurs before scheduled maturity) and Extension Risk (when rates of repayment of principal are slower than expected)—Applicable primarily to mortgage-related securities, the risks that the underlying loan obligations may be refinanced (repaid) faster or slower than expected, causing the fund to invest repayment proceeds in, or continue to hold, lower yielding securities, as the case may be.

• Liquidity Risk—The risk that the fund may not be able to sell some or all of its securities at desired prices or may be unable to sell the securities at all, because of a lack of demand in the market for such securities, or a liquidity provider defaults on its obligation to purchase the securities when properly tendered by the fund.

• Risk Associated with Maintaining a Stable Share Price. To the extent that the aggregate market value of the fund’s assets materially varies from the aggregate of the acquisition prices of those assets, the fund may not be able to maintain a stable share price of $1.00. This risk typically is higher during periods of rapidly changing interest rates or when issuer credit quality generally is falling, and is made worse when the fund experiences significant redemption requests.

• Rapid Changes in Interest Rates. Rapid changes in interest rates may cause significant requests to redeem fund shares, and possibly cause the fund to sell portfolio securities at a loss to satisfy those requests.

• Low Short-Term Interest Rates. As short-term interest rates approach 0%, the fund may maintain substantial cash balances. The fund typically does not receive any income from uninvested cash. In addition, if the fund generates insufficient income to pay its expenses, it may not pay a daily dividend.
• Concentrated Exposure to Financial Institutions. Many instruments in which the fund invests, including repurchase agreements, are issued or guaranteed by financial institutions, such as banks and brokers, or are collateralized by securities issued or guaranteed by financial institutions. Changes in the credit worthiness of any of these institutions may adversely affect the value of instruments held by the fund.

• Asset-Backed Securities Risk. Defaults on the underlying assets of the asset-backed securities held by the fund may impair the value of the securities, and there may be limitations on the enforceability of any security interest granted with respect to those assets. These securities also present a higher degree of prepayment risk (when repayment of principal occurs before scheduled maturity) and extension risk (when rates of repayment of principal are slower than expected) than do other types of fixed income securities.

• Foreign Securities. The fund may invest in U.S. dollar denominated instruments issued by foreign governments, corporations and financial institutions. Financial information relating to foreign issuers may be more limited than financial information generally available for domestic issuers. In addition, the value of instruments of foreign issuers may be adversely affected by local or regional political and economic developments.

Please refer to “Fund Objectives, Strategies and Risks” in the Prospectus for further details.

Risk Money Market Fund [Text]

rr_RiskMoneyMarketFund

Although the fund seeks to preserve the value of your investment at $1.00 per share, it is possible to lose money by investing in the fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

PERFORMANCE

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following bar chart shows how the fund’s performance has varied from year to year, and the table immediately below the chart shows the performance of the fund over the past 1-, 5- and 10-year periods, and over the life of the fund. The bar chart and the table provide some indication of the risks of investing in the fund. A fund’s past performance (both before and after taxes) is not necessarily an indication of how the fund will perform in the future. Current performance information for the fund is available toll free by calling (877) 521-4083 or by visiting our website at www.ssgafunds.com.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The following bar chart shows how the fund’s performance has varied from year to year, and the table immediately below the chart shows the performance of the fund over the past 1-, 5- and 10-year periods, and over the life of the fund.

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

(877) 521-4083

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.ssgafunds.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

A fund’s past performance (both before and after taxes) is not necessarily an indication of how the fund will perform in the future.

Bar Chart [Heading]

rr_BarChartHeading

Annual Total Returns - SSgA Prime Money Market Fund

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

Highest Quarterly Results (2002-2011)	Lowest Quarterly Results (2002-2011)	Year-to- Date Ended
September 30, 2007: 1.31%	September 30, 2011: 0.01%	September 30, 2012: 0.09%

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns For the Periods Ending December 31, 2011:

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

To obtain the fund’s current yield, please call (877) 521-4083.

Money Market Seven Day Yield, Caption [Text]

rr_MoneyMarketSevenDayYieldCaption

To obtain the fund’s current yield

Money Market Seven Day Yield Phone

rr_MoneyMarketSevenDayYieldPhone

(877) 521-4083

SSgA Prime Money Market Fund | Institutional

Risk/Return:

rr_RiskReturnAbstract

Shareholder Fees (fees paid directly from your investment)

rr_ShareholderFeeOther

none

Management Fee

rr_ManagementFeesOverAssets

0.15%

Distribution and Shareholder Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.05%

Other Expenses

rr_OtherExpensesOverAssets

0.05%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.25%

Less Fee Waivers and/or Expense Reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.05%)

^[1]

Total Annual Fund Operating Expenses After Fee Waivers and Expense Reimbursements

rr_NetExpensesOverAssets

0.20%

^[1]

1 year

rr_ExpenseExampleYear01

20

3 years

rr_ExpenseExampleYear03

75

5 years

rr_ExpenseExampleYear05

136

10 years

rr_ExpenseExampleYear10

313

2002

rr_AnnualReturn2002

1.74%

2003

rr_AnnualReturn2003

1.03%

2004

rr_AnnualReturn2004

1.22%

2005

rr_AnnualReturn2005

3.13%

2006

rr_AnnualReturn2006

4.97%

2007

rr_AnnualReturn2007

5.20%

2008

rr_AnnualReturn2008

2.76%

2009

rr_AnnualReturn2009

0.42%

2010

rr_AnnualReturn2010

0.12%

2011

rr_AnnualReturn2011

0.08%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Ended

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Sep. 30, 2012

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

0.09%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarterly Results (2002-2011)

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Sep. 30, 2007

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

1.31%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarterly Results (2002-2011)

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Sep. 30, 2011

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

0.01%

1 Year

rr_AverageAnnualReturnYear01

0.08%

^[2]

5 Years

rr_AverageAnnualReturnYear05

1.70%

^[2]

10 Years

rr_AverageAnnualReturnYear10

2.05%

^[2]

[1] The fund's investment advisor is contractually obligated until December 31, 2013 to waive 0.05% of its 0.15% management fee. Additionally, the advisor is further contractually obligated until December 31, 2013 to waive its management fee and to reimburse the fund for all expenses to the extent that total expenses (exclusive of non-recurring account fees, extraordinary expenses and acquired fund fees) exceed 0.20% of average daily net assets on an annual basis. This waiver and reimbursement may not be terminated during the relevant period except with Board approval. Extraordinary expenses that are not subject to the foregoing contractual expense limitation agreement include, but are not limited to, any reimbursement payments made by the fund to the fund's investment advisor of fund fees and expenses that were previously waived or reimbursed by the fund's investment advisor in order to maintain to avoid a non-negative net yield for the fund. The fund's investment advisor may also reduce all or a portion of its fees and/or reimburse expenses of the fund to the extent necessary to maintain a minimum net yield for the fund (the "Voluntary Reduction") which may vary from time to time in the investment advisor's sole discretion. The fund has agreed, subject to certain limitations, to reimburse its investment advisor for the full dollar amount of any Voluntary Reduction incurred after August 1, 2012. As of August 1, 2012, the fund's investment advisor has not waived fees and/or reimbursed expenses under the voluntary yield waiver. Any future reimbursement of previously waived fees by the fund to its investment advisor may cause the total fund annual operating expenses of the fund to exceed the expense limitation under the contractual expense limitation agreement. The investment advisor may, in its sole discretion, irrevocably waive receipt of any or all reimbursement amounts due from the fund, without limitation.

[2] The returns would have been lower without the contractual and voluntary management fee waiver and/or expense reimbursement.

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

SSGA FUNDS

Prospectus Date

rr_ProspectusDate

Dec. 14, 2012

SSgA Tuckerman Active REIT Fund

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

FUND SUMMARY SSgA TUCKERMAN ACTIVE REIT FUND

Objective [Heading]

rr_ObjectiveHeading

INVESTMENT OBJECTIVE

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

SSgA Tuckerman Active REIT Fund seeks to provide income and capital growth by investing primarily in publicly traded securities issued by real estate investment trusts.

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.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder Fees
     (fees paid directly from your investment)

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

December 31, 2013

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 may indicate higher transaction costs and may result in higher taxes when fund 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 turnover rate was 21% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

21.00%

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 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, that all dividends and distributions are reinvested, and that the fund’s operating expenses remain the same. The calculation of costs for the one-year period takes into account the effect of any current contractual fee waivers and/or reimbursements; and the calculation of costs for the remaining periods takes such fee waivers and/or reimbursements into account only for the first year of the periods. 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

SSgA Tuckerman Active REIT Fund invests at least 80% of its net assets (plus borrowings, if any) in real estate investment trusts, or REITs. The fund is non-diversified, that is, compared with other funds, the fund may invest a greater percentage of its assets in a particular issuer. The fund attempts to meet its objective through the active selection of REITs, primarily from those securities in the Dow Jones U.S. Select REIT^® Index, and across different industry types and regions based on the fundamental research of the fund’s advisor. The fund invests with a relatively long-term horizon.

In addition to REIT securities, the fund may invest up to 20% of its assets in non-REIT real estate securities, as well as equity and fixed income securities of non-real estate companies. The fund also may lend its securities, and it may invest in various fixed-income securities and money market funds, including money market funds advised by the fund’s investment advisor, in order to manage its cash. The fund may take temporary defensive positions that are inconsistent with its principal investment strategies.

Risk [Heading]

rr_RiskHeading

PRINCIPAL RISKS

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

It is possible to lose money by investing in the fund. 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.

Investing in this fund may involve more risks, and consequently, the fund may have a more volatile share price than a fund investing primarily in a diversified portfolio of equity securities of large, established U.S. corporations.

• Risks Common to Funds Investing Principally in Equity Securities.
• Market, Industry and Specific Holdings—The share price of the fund may fall because of weakness in the stock markets, generally, weaknesses with respect to a particular industry in which the fund has significant holdings, or weaknesses associated with one or more specific companies in which the fund may have substantial investments.
• Liquidity Risk—The risk that the fund may not be able to sell some or all of its securities at desired prices or may be unable to sell the securities at all.
• Non-Diversified Investments. To the extent the fund’s investments are weighted heavily in the securities of one or a few issuers, developments affecting those issuers are likely to have a greater impact on the fund’s share price.
• Real Estate Securities. The fund’s investments in companies that hold or manage real estate, including REITs, are subject to many of the risks associated with direct ownership of real estate, and may be affected by changes in general and local economic conditions and lack of diversification.

Please refer to “Fund Objectives, Strategies and Risks” in the Prospectus for further details.

Risk Lose Money [Text]

rr_RiskLoseMoney

It is possible to lose money by investing in the fund.

Risk Nondiversified Status [Text]

rr_RiskNondiversifiedStatus

• Non-Diversified Investments. To the extent the fund’s investments are weighted heavily in the securities of one or a few issuers, developments affecting those issuers are likely to have a greater impact on the fund’s share price.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

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.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

PERFORMANCE

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following bar chart shows how the fund’s performance has varied from year to year, and the table immediately below the chart shows the performance of the fund over the past 1-, 5- and 10-year periods, and over the life of the fund, and compares the fund’s performance to the performance of a broad-based securities market index. The bar chart and the table provide some indication of the risks of investing in the fund. Index returns do not reflect deductions for fees, taxes or expenses associated with investment in a fund. A fund’s past performance (both before and after taxes) is not necessarily an indication of how the fund will perform in the future. Current performance information for the fund is available toll free by calling (800) 647-7327 or by visiting our website at www.ssgafunds.com.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The following bar chart shows how the fund’s performance has varied from year to year, and the table immediately below the chart shows the performance of the fund over the past 1-, 5- and 10-year periods, and over the life of the fund, and compares the fund’s performance to the performance of a broad-based securities market index.

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

(800) 647-7327

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.ssgafunds.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

A fund’s past performance (both before and after taxes) is not necessarily an indication of how the fund will perform in the future.

Bar Chart [Heading]

rr_BarChartHeading

Annual Total Returns - SSgA Tuckerman Active REIT Fund

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

Highest Quarterly Results (2002-2011)	Lowest Quarterly Results (2002-2011)	Year-to- Date Ended
September 30, 2009: 30.54%	December 31, 2008: (41.84)%	September 30, 2012: 13.32%

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns For the Periods Ending December 31, 2011:

Index No Deduction for Fees, Expenses, Taxes [Text]

rr_IndexNoDeductionForFeesExpensesTaxes

Index returns do not reflect deductions for fees, taxes or expenses associated with investment in a fund.

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

After-tax returns depend on an investor’s tax situation and may differ from those shown, and after-tax returns are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts (IRAs).

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

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

SSgA Tuckerman Active REIT Fund | Institutional

Risk/Return:

rr_RiskReturnAbstract

Shareholder Fees (fees paid directly from your investment)

rr_ShareholderFeeOther

none

Management Fee

rr_ManagementFeesOverAssets

0.65%

Distribution and Shareholder Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other Expenses

rr_OtherExpensesOverAssets

0.42%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.32%

Less Fee Waivers and/or Expense Reimbursements

rr_FeeWaiverOrReimbursementOverAssets

(0.32%)

^[1]

Total Annual Fund Operating Expenses After Fee Waivers and Expense Reimbursements

rr_NetExpensesOverAssets

1.00%

^[1]

1 year

rr_ExpenseExampleYear01

102

3 years

rr_ExpenseExampleYear03

387

5 years

rr_ExpenseExampleYear05

693

10 years

rr_ExpenseExampleYear10

1,562

2002

rr_AnnualReturn2002

6.56%

2003

rr_AnnualReturn2003

31.80%

2004

rr_AnnualReturn2004

37.40%

2005

rr_AnnualReturn2005

14.20%

2006

rr_AnnualReturn2006

36.03%

2007

rr_AnnualReturn2007

(14.93%)

2008

rr_AnnualReturn2008

(41.67%)

2009

rr_AnnualReturn2009

21.74%

2010

rr_AnnualReturn2010

25.11%

2011

rr_AnnualReturn2011

10.16%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Ended

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Sep. 30, 2012

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

13.32%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarterly Results (2002-2011)

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Sep. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

30.54%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarterly Results (2002-2011)

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(41.84%)

1 Year

rr_AverageAnnualReturnYear01

10.16%

^[2]

5 Years

rr_AverageAnnualReturnYear05

(3.60%)

^[2]

10 Years

rr_AverageAnnualReturnYear10

9.58%

^[2]

SSgA Tuckerman Active REIT Fund | Return After Taxes on Distributions | Institutional

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

9.61%

^[2]

5 Years

rr_AverageAnnualReturnYear05

(5.34%)

^[2]

10 Years

rr_AverageAnnualReturnYear10

7.64%

^[2]

SSgA Tuckerman Active REIT Fund | Return After Taxes on Distributions and Sale of Fund Shares | Institutional

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

6.58%

^[2]

5 Years

rr_AverageAnnualReturnYear05

(3.55%)

^[2]

10 Years

rr_AverageAnnualReturnYear10

7.67%

^[2]

SSgA Tuckerman Active REIT Fund | Dow Jones U.S. Select REIT® Index (reflects no deduction for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

9.24%

^[2]

5 Years

rr_AverageAnnualReturnYear05

(1.96%)

^[2]

10 Years

rr_AverageAnnualReturnYear10

10.16%

^[2]

[1] The fund's investment advisor is contractually obligated until December 31, 2013 to waive its management fee and to reimburse the fund for expenses to the extent that total expenses (exclusive of non-recurring account fees, extraordinary expenses and acquired fund fees) exceed 1.00% of average daily net assets on an annual basis. This waiver and reimbursement may not be terminated during the relevant period except with Board approval.

[2] The returns would have been lower without the contractual fee waiver and/or expense reimbursement.

XML

SSgA Enhanced Small Cap Fund

FUND SUMMARY SSgA ENHANCED SMALL CAP FUND

INVESTMENT OBJECTIVE

SSgA Enhanced Small Cap Fund seeks to maximize total return through investment primarily in small capitalization equity securities.

FEES AND EXPENSES OF THE FUND

This table describes the fees and expenses that you may pay if you buy and hold shares of the fund.

Shareholder Fees (USD $)	SSgA Enhanced Small Cap Fund Institutional
Shareholder Fees (fees paid directly from your investment)	none

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

Annual Fund Operating Expenses		SSgA Enhanced Small Cap Fund Institutional
Management Fee		0.45%
Distribution and Shareholder Service (12b-1) Fees		0.22%
Other Expenses		0.91%
Total Annual Fund Operating Expenses		1.58%
Less Fee Waivers and/or Expense Reimbursements	[1]	(0.83%)
Total Annual Fund Operating Expenses After Fee Waivers and Expense Reimbursements	[1]	0.75%

EXAMPLE

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, that all dividends and distributions are reinvested, and that the fund’s operating expenses remain the same. The calculation of costs for the one-year period takes into account the effect of any current contractual fee waivers and/or reimbursements; and the calculation of costs for the remaining periods takes such fee waivers and/or reimbursements into account only for the first year of the periods. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:

Expense Example (USD $)	1 year	3 years	5 years	10 years
SSgA Enhanced Small Cap Fund Institutional	77	417	782	1,808

PORTFOLIO TURNOVER

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 fund 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 turnover rate was 64% of the average value of its portfolio.

PRINCIPAL INVESTMENT STRATEGIES

SSgA Enhanced Small Cap Fund will invest at least 80% of its net assets (plus borrowings, if any) in equity securities of small capitalization companies. A small capitalization company is a company with a market capitalization no larger than the company with the largest capitalization contained in the Russell 2000 Index. The equity securities invested in by the fund are comprised primarily of common stocks and may include IPOs.

To manage the fund’s portfolio, the fund’s advisor employs a proprietary quantitative multi-factor stock-selection model to select securities that maintain similar sector and industry weightings as the fund’s benchmark, while controlling risk exposure of the fund relative to the fund’s benchmark. The securities selected by the model include a core portfolio drawn from securities in the fund’s benchmark and intended to reflect the risk characteristics of the fund’s benchmark, and certain additional securities of small capitalization companies identified by the model in order to overweight or underweight certain securities, industries and sectors represented in the fund’s benchmark. The model evaluates the relative attractiveness of securities of small capitalization companies based on the correlation of certain historical economic and financial factors (such as measures of growth potential, valuation, quality and share price momentum) to past performance and then rank the securities in the order of their attractiveness as fund investments. The model determines the specific securities that the fund invests in, the quantity of a security held by the fund and whether to overweight or underweight certain securities, industries or sectors relative to the benchmark based on an evaluation of a security’s relative return and risk attractiveness.

The fund periodically rebalances its portfolio to reflect movements in the underlying factors used by the model and changes predicted by the model. The advisor regularly reexamines the model and may make updates or adjustments to the economic and financial factors considered.

From time to time, the advisor may make a qualitative judgment and deviate from the model, but only for events that are not quantifiable by the model.

The fund also may lend its securities, and it may invest in various fixed-income securities and money market funds, including money market funds advised by the fund’s investment advisor, in order to manage its cash. The fund also may engage in active trading, which could reduce the returns of fund shareholders investing through a taxable account, and the fund may take temporary defensive positions that are inconsistent with its principal investment strategies.

PRINCIPAL RISKS

It is possible to lose money by investing in the fund. 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.

• Risks Common to Funds Investing Principally in Equity Securities.

• Market, Industry and Specific Holdings—The share price of the fund may fall because of weakness in the stock markets, generally, weaknesses with respect to a particular industry in which the fund has significant holdings, or weaknesses associated with one or more specific companies in which the fund may have substantial investments.

• Liquidity Risk—The risk that the fund may not be able to sell some or all of its securities at desired prices or may be unable to sell the securities at all.

• Use of a Quantitative Strategy. A quantitative investment strategy generally is based on the assumption that the future performance of a specific security relative to other securities may be predicted based on the correlation of certain historical economic and financial factors to past performance. Over time, the correlation between these factors and performance may diminish, which may impair the fund’s ability to achieve its investment objective.

• More Volatility than the Fund’s Benchmark. While presenting the opportunity for excess returns relative to the Russell 2000 Index, the fund’s strategy may present a greater risk of loss and higher tracking error compared to a fund that follows a strict indexing strategy.

• Small-Capitalization Securities. Investments in small-capitalization companies typically present greater risks than investments in larger companies because small companies often have limited product lines and few managerial or financial resources. As a result, the performance of the fund may be more volatile than a fund that invests in large-cap stocks.

• Sector. The fund may have significant investments in one or more specific industry sectors, subjecting it to risks greater than general market risk.

• Derivatives. The fund’s investments in derivative instruments are subject to a number of risks, such as counterparty risk, the risk of mispricing or improper valuation, and the risk that the value of the instrument may not increase or decrease as expected.

Please refer to “Fund Objectives, Strategies and Risks” in the Prospectus for further details.

PERFORMANCE

The following bar chart shows how the fund’s performance has varied from year to year, and the table immediately below the chart shows the performance of the fund over the past 1-, 5- and 10-year periods, and over the life of the fund, and compares the fund’s performance to the performance of a broad-based securities market index. The bar chart and the table provide some indication of the risks of investing in the fund. Index returns do not reflect deductions for fees, taxes or expenses associated with investment in a fund. A fund’s past performance (both before and after taxes) is not necessarily an indication of how the fund will perform in the future. Current performance information for the fund is available toll free by calling (800) 647-7327 or by visiting our website at www.ssgafunds.com.

Annual Total Returns - SSgA Enhanced Small Cap Fund

Highest Quarterly Results (2006-2010)	Lowest Quarterly Results (2006-2010)	Year-to- Date Ended
June 30, 2009: 19.10%	December 31, 2008: (26.68)%	September 30, 2012: 13.96%

Average Annual Total Returns For the Periods Ending December 31, 2011:

Average Annual Total Returns SSgA Enhanced Small Cap Fund		1 Year	5 Years	Since Inception
Institutional	[1]	0.55%	(1.56%)	3.01%	[2]
Institutional Return After Taxes on Distributions	[1]	0.26%	(1.84%)	2.51%	[2]
Institutional Return After Taxes on Distributions and Sale of Fund Shares	[1]	0.35%	(1.40%)	2.43%	[2]
Russell 2000® Index (reflects no deduction for fees, expenses or taxes)	[1]	(4.18%)	0.15%	4.07%	[2]

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

[1] The fund’s investment advisor is contractually obligated until December 31, 2013 to waive its management fee and to reimburse the fund for expenses to the extent that total expenses (exclusive of non-recurring account fees, extraordinary expenses and acquired fund fees) exceed 0.75% of average daily net assets on an annual basis. This waiver and reimbursement may not be terminated during the relevant period except with Board approval.

[1] The returns would have been lower without the contractual fee waiver and/or expense reimbursement.

[2] The Fund began operating on March 22, 2005.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	SSGA FUNDS
Prospectus Date	rr_ProspectusDate	Dec. 14, 2012
Document Creation Date	dei_DocumentCreationDate	Dec. 14, 2012

XML

Institutional Shares | SSgA Emerging Markets Fund

FUND SUMMARY SSgA EMERGING MARKETS FUND

INVESTMENT OBJECTIVE

SSgA Emerging Markets Fund seeks to provide maximum total return, primarily through capital appreciation, by investing primarily in securities of foreign issuers.

FEES AND EXPENSES OF THE FUND

This table describes the fees and expenses that you may pay if you buy and hold shares of the fund.

Shareholder Fees (USD $)	Institutional Shares SSgA Emerging Markets Fund Institutional
Shareholder Fees (fees paid directly from your investment)	none

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

Annual Fund Operating Expenses		Institutional Shares SSgA Emerging Markets Fund Institutional
Management Fee		0.75%
Distribution and Shareholder Service (12b-1) Fees		0.25%
Other Expenses		0.28%
Total Annual Fund Operating Expenses		1.28%
Less Fee Waivers and/or Expense Reimbursements	[1]	(0.03%)
Total Annual Fund Operating Expenses After Fee Waivers and Expense Reimbursements	[1]	1.25%

EXAMPLE

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, that all dividends and distributions are reinvested, and that the fund’s operating expenses remain the same. The calculation of costs for the one-year period takes into account the effect of any current contractual fee waivers and/or reimbursements; and the calculation of costs for the remaining periods takes such fee waivers and/or reimbursements into account only for the first year of the periods. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:

Expense Example (USD $)	1 year	3 years	5 years	10 years
Institutional Shares SSgA Emerging Markets Fund Institutional	127	403	699	1,543

PORTFOLIO TURNOVER

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 fund 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 turnover rate was 74% of the average value of its portfolio.

PRINCIPAL INVESTMENT STRATEGIES

The fund will invest at least 80% of its net assets (plus borrowings, if any) in equity securities issued by companies domiciled or doing a substantial portion of their business in countries determined by the fund’s advisor to have a developing or emerging economy or securities market. An emerging market is any market included in the MSCI Emerging Markets Index, the fund’s benchmark.

The fund’s advisor employs a proprietary quantitative model to assist in country and stock selection, which the advisor believes are the keys to achieving the fund’s objective. This model is intended to help determine the relative attractiveness of the countries and securities within the fund’s investment universe. In addition, the model assists the advisor in controlling the fund’s exposure to risks relative to the fund’s benchmark. The model is based on the historical relationships of certain economic and financial factors applicable to issuers and/or countries (such as measures of value, sentiment and share price momentum) to past performance. It allows the advisor to evaluate quickly each eligible security and then rank all eligible securities in the fund’s investment universe in the order of their attractiveness as fund investments. The advisor regularly reexamines the model and, when necessary, makes updates or adjustments to the economic and financial factors considered. The fund periodically rebalances its portfolio to reflect movements in the underlying factors. From time to time, the advisor will make a qualitative judgment to deviate from the model, but only if it believes that certain current information is not fully reflected in the model.

The fund may invest in common and preferred equity securities, publicly traded in the U.S. or in foreign countries in developed or emerging markets, securities convertible into common stocks, initial public offerings, equity swaps, equity futures, currency forwards, index swaps, structured equity notes, equity linked notes, American Depository Receipts and participation certificates.

The fund may use futures, forwards, swaps and certain other instruments to seek to generate returns. The fund’s use of futures, forwards, swaps and certain other instruments provides financial leverage. Through the use of leverage, the fund’s total investment exposure could far exceed the value of its portfolio holdings and its investment returns could depend upon the performance of equities and currencies that the fund does not own.

The fund also may lend its securities, and it may invest in various fixed-income securities and money market funds, including money market funds advised by the fund’s investment advisor, in order to manage its cash. The fund may take temporary defensive positions that are inconsistent with its principal investment strategies.

PRINCIPAL RISKS

It is possible to lose money by investing in the fund. 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.

Investing in this fund may involve more risk, and consequently, the fund may have a more volatile share price, than a fund investing primarily in equity securities of large, established U.S. corporations.

• Risks Common to Funds Investing Principally in Equity Securities.

• Market, Industry and Specific Holdings—The share price of the fund may fall because of weakness in the stock markets, generally, weaknesses with respect to a particular industry in which the fund has significant holdings, or weaknesses associated with one or more specific companies in which the fund may have substantial investments.

• Liquidity Risk—The risk that the fund may not be able to sell some or all of its securities at desired prices or may be unable to sell the securities at all.

• Use of a Quantitative Strategy. A quantitative investment strategy generally is based on the assumption that the future performance of a specific security relative to other securities may be predicted based on the correlation of certain historical economic and financial factors to past performance. Over time, the correlation between these factors and performance may diminish, which may impair the fund’s ability to achieve its investment objective.

• Foreign Securities, including Emerging Market Securities. To the extent the fund holds securities of foreign issuers, financial information concerning those issuers may be unavailable or more limited than information generally available from U.S. issuers, and it may have difficulty selling the securities or protecting its investment. Foreign securities also tend to be adversely affected by local or regional political and economic developments, as well as changes in exchange rates, and the inconvertibility of local currency into U.S. dollars. For emerging market equity securities, these risks tend to be greater than for securities of issuers located in more developed countries.

• Sector. The fund may have significant investments in one or more specific industry sectors, subjecting it to risks greater than general market risk.

• American Depositary Receipts (ADRs) and Global Depositary Receipts (GDRs). ADRs and GDRs held by the fund have the same currency and economic risks as the underlying shares they represent, as well as the risks associated with foreign securities.

• Derivatives. Investments in a derivative instrument could lose more than the principal amount invested. Compared to conventional securities, derivatives can be more sensitive to changes in interest rates or to sudden fluctuations in market prices and thus a fund’s losses may be greater if it invests in derivatives than if it invests only in conventional securities. The use of derivative instruments involves risks different from, or possibly greater than, the risks associated with investing directly in equity or fixed income securities, currencies or other investments. Derivatives are subject to a number of risks such as liquidity risk, market risk, credit risk, default risk, counterparty risk and management risk. They also involve the risk of mispricing or improper valuation and the risk that changes in the value of the derivative may not correlate exactly with the change in the value of the underlying asset, rate or index.

• Futures Risk. The risk of loss in trading futures contracts in some strategies is potentially unlimited. The entire amount invested in futures contracts could be lost. There also is no assurance that a liquid secondary market will exist for futures contracts and options in which a fund may invest. Participation in the futures markets, as well as the use of various forward contracts, involves investment risks and transaction costs to which the fund would not be subject absent the use of these strategies. If the fund’s predictions of movements in the direction of the securities, fixed income or currencies markets are inaccurate, the adverse consequences to the fund may leave the fund in a worse position than if such strategies were not used.

• Forward Currency Contracts. The fund may engage in forward currency contracts to hedge against uncertainty in the level of future exchange rates or to effect investment transactions to generate returns consistent with the fund’s investment objective and strategies. A forward contract involves an obligation to purchase or sell a specific currency. Forward currency contracts are subject to the risk that should forward prices increase, a loss will be incurred to the extent that the price of the currency agreed to be purchased exceeds the price of the currency agreed to be sold.

• Swaps. A swap is a two-party contract that generally obligates one party to pay the positive return and the other party to pay the negative return on a specified reference security, basket of securities, security index or index component. Swaps can involve greater risks than direct investment in securities, because swaps may be leveraged and are subject to counterparty risk (e.g., the risk of a counterparty’s defaulting on the obligation or bankruptcy), credit risk and pricing risk (i.e., swaps may be difficult to value). Swaps may also be considered illiquid. It may not be possible for the Fund to liquidate a swap position at an advantageous time or price, which may result in significant losses.

• Participation Certificates. Participation certificates are issued by banks or broker-dealers and are designed to offer a return linked to a security, index of securities or other asset. Investments in participation certificates involve the same risks associated with a direct investment in the underlying foreign companies or foreign securities markets that they seek to replicate and are subject to counterparty risk.

Please refer to “Fund Objectives, Strategies and Risks” in the Prospectus for further details.

PERFORMANCE

The following bar chart shows how the fund’s performance has varied from year to year, and the table immediately below the chart shows the performance of the fund over the past 1-, 5- and 10-year periods, and over the life of the fund, and compares the fund’s performance to the performance of a broad-based securities market index. The bar chart and the table provide some indication of the risks of investing in the fund. Index returns do not reflect deductions for fees, taxes or expenses associated with investment in a fund. A fund’s past performance (both before and after taxes) is not necessarily an indication of how the fund will perform in the future. Current performance information for the fund is available toll free by calling (800) 647-7327 or by visiting our website at www.ssgafunds.com.

Annual Total Returns - SSgA Emerging Markets Fund

Highest Quarterly Results (2002-2011)	Lowest Quarterly Results (2002-2011)	Year-to- Date Ended
June 30, 2009: 31.26%	September 30, 2008: (29.94)%	September 30, 2012: 9.06%

Average Annual Total Returns
For the Periods Ending December 31, 2011:

Average Annual Total Returns Institutional Shares SSgA Emerging Markets Fund	1 Year	5 Years		10 Years
Institutional	(19.00%)	0.30%	[1]	12.99%	[1]
Institutional Return After Taxes on Distributions	(19.45%)	(0.54%)	[1]	12.24%	[1]
Institutional Return After Taxes on Distributions and Sale of Fund Shares	(12.35%)	0.19%	[1]	11.68%	[1]
MSCI® Emerging Markets Index (Gross) (reflects no deduction for fees, expenses or taxes)	(18.17%)	2.70%	[1]	14.20%	[1]
MSCI® Emerging Markets Index (Net) (reflects no deduction for fees, expenses or taxes)	(18.42%)	2.40%	[1]	13.86%	[1]

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

[1] The fund's investment advisor is contractually obligated until December 31, 2013 to waive its management fee and to reimburse the fund for expenses to the extent that total expenses (exclusive of non-recurring account fees, extraordinary expenses, and acquired fund fee and expenses) exceed 1.25% of average daily net assets on an annual basis. This waiver and reimbursement may not be terminated during the relevant period except with Board approval.

[1] The returns would have been lower without the contractual fee waiver and/or expense reimbursement.

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

SSGA FUNDS

Prospectus Date

rr_ProspectusDate

Dec. 14, 2012

Select Class Shares | SSgA Emerging Markets Fund

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

FUND SUMMARY SSgA EMERGING MARKETS FUND

Objective [Heading]

rr_ObjectiveHeading

INVESTMENT OBJECTIVE

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

SSgA Emerging Markets Fund seeks to provide maximum total return, primarily through capital appreciation, by investing primarily in securities of foreign issuers.

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.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder Fees
     (fees paid directly from your investment)

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)

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 may indicate higher transaction costs and may result in higher taxes when fund 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 turnover rate was 74% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

74.00%

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 Select Class Shares of the fund with the cost of investing in other mutual funds.

The example assumes that you invest $10,000 in Select Class Shares of the fund for the time periods indicated, and then redeem all of your Select Class Shares of the fund at the end of those periods. The example also assumes that your investment has a 5% return each year, that all dividends and distributions are reinvested, and that the fund’s operating expenses remain the same. The calculation of costs for the one year period takes into account the effect of any current contractual fee waivers and/or reimbursements. The calculation of costs for the remaining periods takes such fee waivers and/or reimbursements into account only for the first year of the periods. 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

The fund will invest at least 80% of its net assets (plus borrowings, if any) in equity securities issued by companies domiciled or doing a substantial portion of their business in countries determined by the fund’s advisor to have a developing or emerging economy or securities market. An emerging market is any market included in the MSCI Emerging Markets Index, the fund’s benchmark.

The fund’s advisor employs a proprietary quantitative model to assist in country and stock selection, which the advisor believes are the keys to achieving the fund’s objective. This model is intended to help determine the relative attractiveness of the countries and securities within the fund’s investment universe. In addition, the model assists the advisor in controlling the fund’s exposure to risks relative to the fund’s benchmark. The model is based on the historical relationships of certain economic and financial factors applicable to issuers and/or countries (such as measures of value, sentiment and share price momentum) to past performance. It allows the advisor to evaluate quickly each eligible security and then rank all eligible securities in the fund’s investment universe in the order of their attractiveness as fund investments. The advisor regularly reexamines the model and, when necessary, makes updates or adjustments to the economic and financial factors considered. The fund periodically rebalances its portfolio to reflect movements in the underlying factors. From time to time, the advisor will make a qualitative judgment to deviate from the model, but only if it believes that certain current information is not fully reflected in the model.

The fund may invest in common and preferred equity securities, publicly traded in the U.S. or in foreign countries in developed or emerging markets, securities convertible into common stocks, initial public offerings, equity swaps, equity futures, currency forwards, index swaps, structured equity notes, equity linked notes, American Depository Receipts and participation certificates.

The fund may use futures, forwards, swaps and certain other instruments to seek to generate returns. The fund’s use of futures, forwards, swaps and certain other instruments provides financial leverage. Through the use of leverage, the fund’s total investment exposure could far exceed the value of its portfolio holdings and its investment returns could depend upon the performance of equities and currencies that the fund does not own.

The fund also may lend its securities, and it may invest in various fixed-income securities and money market funds, including money market funds advised by the fund’s investment advisor, in order to manage its cash. The fund may take temporary defensive positions that are inconsistent with its principal investment strategies.

Risk [Heading]

rr_RiskHeading

PRINCIPAL RISKS

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

It is possible to lose money by investing in the fund. 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.

Investing in this fund may involve more risk, and consequently, the fund may have a more volatile share price, than a fund investing primarily in equity securities of large, established U.S. corporations.

• Risks Common to Funds Investing Principally in Equity Securities.

• Market, Industry and Specific Holdings — The share price of the fund may fall because of weakness in the stock markets, generally, weaknesses with respect to a particular industry in which the fund has significant holdings, or weaknesses associated with one or more specific companies in which the fund may have substantial investments.

• Liquidity Risk — The risk that the fund may not be able to sell some or all of its securities at desired prices or may be unable to sell the securities at all.

• Use of a Quantitative Strategy. A quantitative investment strategy generally is based on the assumption that the future performance of a specific security relative to other securities may be predicted based on the correlation of certain historical economic and financial factors to past performance. Over time, the correlation between these factors and performance may diminish, which may impair the fund’s ability to achieve its investment objective.

• Foreign Securities, including Emerging Market Securities. To the extent the fund holds securities of foreign issuers, financial information concerning those issuers may be unavailable or more limited than information generally available from U.S. issuers, and it may have difficulty selling the securities or protecting its investment. Foreign securities also tend to be adversely affected by local or regional political and economic developments, as well as changes in exchange rates, and the inconvertibility of local currency into U.S. dollars. For emerging market equity securities, these risks tend to be greater than for securities of issuers located in more developed countries.

• Sector. The fund may have significant investments in one or more specific industry sectors, subjecting it to risks greater than general market risk.

• American Depositary Receipts (ADRs) and Global Depositary Receipts (GDRs). ADRs and GDRs held by the fund have the same currency and economic risks as the underlying shares they represent, as well as the risks associated with foreign securities.

• Derivatives. Investments in a derivative instrument could lose more than the principal amount invested. Compared to conventional securities, derivatives can be more sensitive to changes in interest rates or to sudden fluctuations in market prices and thus a fund’s losses may be greater if it invests in derivatives than if it invests only in conventional securities. The use of derivative instruments involves risks different from, or possibly greater than, the risks associated with investing directly in equity or fixed income securities, currencies or other investments. Derivatives are subject to a number of risks such as liquidity risk, market risk, credit risk, default risk, counterparty risk and management risk. They also involve the risk of mispricing or improper valuation and the risk that changes in the value of the derivative may not correlate exactly with the change in the value of the underlying asset, rate or index.

• Futures Risk. The risk of loss in trading futures contracts in some strategies is potentially unlimited. The entire amount invested in futures contracts could be lost. There also is no assurance that a liquid secondary market will exist for futures contracts and options in which a fund may invest. Participation in the futures markets, as well as the use of various forward contracts, involves investment risks and transaction costs to which the fund would not be subject absent the use of these strategies. If the fund’s predictions of movements in the direction of the securities, fixed income or currencies markets are inaccurate, the adverse consequences to the fund may leave the fund in a worse position than if such strategies were not used.

• Forward Currency Contracts. The fund may engage in forward currency contracts to hedge against uncertainty in the level of future exchange rates or to effect investment transactions to generate returns consistent with the fund’s investment objective and strategies. A forward contract involves an obligation to purchase or sell a specific currency. Forward currency contracts are subject to the risk that should forward prices increase, a loss will be incurred to the extent that the price of the currency agreed to be purchased exceeds the price of the currency agreed to be sold.

• Swaps. A swap is a two-party contract that generally obligates one party to pay the positive return and the other party to pay the negative return on a specified reference security, basket of securities, security index or index component. Swaps can involve greater risks than direct investment in securities, because swaps may be leveraged and are subject to counterparty risk (e.g., the risk of a counterparty’s defaulting on the obligation or bankruptcy), credit risk and pricing risk (i.e., swaps may be difficult to value). Swaps may also be considered illiquid. It may not be possible for the Fund to liquidate a swap position at an advantageous time or price, which may result in significant losses.

• Participation Certificates. Participation certificates are issued by banks or broker-dealers and are designed to offer a return linked to a security, index of securities or other asset. Investments in participation certificates involve the same risks associated with a direct investment in the underlying foreign companies or foreign securities markets that they seek to replicate and are subject to counterparty risk.

Please refer to “Fund Objectives, Strategies and Risks” in the Prospectus for further details.

Risk Lose Money [Text]

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It is possible to lose money by investing in the fund.

Risk Not Insured Depository Institution [Text]

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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.

Bar Chart and Performance Table [Heading]

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PERFORMANCE

Performance Narrative [Text Block]

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The following bar chart shows how the performance fund’s Select Class Shares has varied from year to year, and the table immediately below the chart shows the performance of the fund’s Select Class Shares over the past 1-, 5- and 10-year periods, and over the life of the fund, and compares the fund’s performance to the performance of a broad-based securities market index. Performance information for Select Class Shares before their inception (March 1, 2006) is derived from the historical performance of the fund’s Institutional Class Shares, adjusted for differences in the operating expenses of the two classes The bar chart and the table provide some indication of the risks of investing in the fund. Index returns do not reflect deductions for fees, taxes or expenses associated with investment in a fund. The fund’s past performance (both before and after taxes) is not necessarily an indication of how the fund will perform in the future. Current performance information for the fund is available toll free by calling (800) 647-7327 or by visiting our website at www.ssgafunds.com.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The following bar chart shows how the performance fund’s Select Class Shares has varied from year to year, and the table immediately below the chart shows the performance of the fund’s Select Class Shares over the past 1-, 5- and 10-year periods, and over the life of the fund, and compares the fund’s performance to the performance of a broad-based securities market index.

Performance Availability Phone [Text]

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(800) 647-7327

Performance Availability Website Address [Text]

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www.ssgafunds.com

Performance Past Does Not Indicate Future [Text]

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The fund’s past performance (both 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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Annual Total Returns - SSgA Emerging Markets Fund

Bar Chart Closing [Text Block]

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Highest Quarterly Results (2002-2011)	Lowest Quarterly Results (2002-2011)	Year-to- Date Ended
June 30, 2009: 31.35%	September 30, 2008: (29.88)%	September 30, 2012: 9.26%

Performance Table Heading

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Average Annual Total Returns For the Periods Ending December 31, 2011:

Index No Deduction for Fees, Expenses, Taxes [Text]

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Index returns do not reflect deductions for fees, taxes or expenses associated with investment in a fund.

Performance Table Uses Highest Federal Rate

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After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

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After-tax returns depend on an investor’s tax situation and may differ from those shown, and after-tax returns are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts (IRAs).

Performance Table Narrative

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

Select Class Shares | SSgA Emerging Markets Fund | Select Class

Risk/Return:

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Shareholder Fees (fees paid directly from your investment)

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none

Management Fee

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0.75%

Distribution and Shareholder Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.03%

Other Expenses

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0.27%

Total Annual Fund Operating Expenses

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1.05%

1 year

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107

3 years

rr_ExpenseExampleYear03

334

5 years

rr_ExpenseExampleYear05

579

10 years

rr_ExpenseExampleYear10

1,283

2002

rr_AnnualReturn2002

(5.03%)

2003

rr_AnnualReturn2003

53.97%

2004

rr_AnnualReturn2004

24.67%

2005

rr_AnnualReturn2005

37.28%

2006

rr_AnnualReturn2006

33.73%

2007

rr_AnnualReturn2007

41.20%

2008

rr_AnnualReturn2008

(56.24%)

2009

rr_AnnualReturn2009

70.77%

2010

rr_AnnualReturn2010

19.81%

2011

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(18.83%)

Year to Date Return, Label

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Year-to-Date Ended

Bar Chart, Year to Date Return, Date

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Sep. 30, 2012

Bar Chart, Year to Date Return

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9.26%

Highest Quarterly Return, Label

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Highest Quarterly Results (2002-2011)

Highest Quarterly Return, Date

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Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

31.35%

Lowest Quarterly Return, Label

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Lowest Quarterly Results (2002-2011)

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Sep. 30, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(29.88%)

1 Year

rr_AverageAnnualReturnYear01

(18.83%)

^[1]

5 Years

rr_AverageAnnualReturnYear05

0.52%

^[1],[2]

10 Years

rr_AverageAnnualReturnYear10

13.13%

^[1],[2]

Select Class Shares | SSgA Emerging Markets Fund | Return After Taxes on Distributions | Select Class

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(19.35%)

^[1]

5 Years

rr_AverageAnnualReturnYear05

(0.37%)

^[1],[2]

10 Years

rr_AverageAnnualReturnYear10

12.36%

^[1],[2]

Select Class Shares | SSgA Emerging Markets Fund | Return After Taxes on Distributions and Sale of Fund Shares | Select Class

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(12.24%)

^[1]

5 Years

rr_AverageAnnualReturnYear05

0.36%

^[1],[2]

10 Years

rr_AverageAnnualReturnYear10

11.80%

^[1],[2]

Select Class Shares | SSgA Emerging Markets Fund | MSCI® Emerging Markets Index (Gross) (reflects no deduction for fees, expenses or taxes)

Risk/Return:

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1 Year

rr_AverageAnnualReturnYear01

(18.17%)

5 Years

rr_AverageAnnualReturnYear05

2.70%

^[2]

10 Years

rr_AverageAnnualReturnYear10

14.20%

^[2]

Select Class Shares | SSgA Emerging Markets Fund | MSCI® Emerging Markets Index (Net) (reflects no deduction for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(18.42%)

5 Years

rr_AverageAnnualReturnYear05

2.40%

^[2]

10 Years

rr_AverageAnnualReturnYear10

13.86%

^[2]

[1] The Select Class began operating on March 1, 2006. Performance for the fund's Select Class before inception is derived from the historical performance of the Institutional Class. The returns shown above do not reflect deduction of the lower distribution fees and shareholder services fees applicable to the Select Class. The returns of the Select Class would have been higher than the Institutional Class due to the lower distribution and shareholder servicing fees.

[2] The returns would have been lower without the contractual fee waiver and/or expense reimbursement.