0000276516 fmmt:S000007117Member fmmt:C000019446Member 2011-10-31 2012-10-30 0000276516 fmmt:S000007116Member fmmt:C000019445Member 2011-10-31 2012-10-30 0000276516 fmmt:S000007117Member 2011-10-31 2012-10-30 0000276516 fmmt:S000007116Member 2011-10-31 2012-10-30 0000276516 2011-10-31 2012-10-30 pure iso4217:USD 2012-09-30 2012-09-30 235 <div style="display:none">~ http://www.fidelity.com/role/ScheduleShareholderFeesRetirementMoneyMarketPortfolio column period compact * ~</div> 235 <div style="display:none">~ http://www.fidelity.com/role/ScheduleShareholderFeesRetirementGovernmentMoneyMarketPortfolio column period compact * ~</div> <font style="FONT-FAMILY: Times New Roman" size="5"><b>Fund Summary</b></font><br/><br/><font style="FONT-FAMILY: Times New Roman" size="3"><b>Fund:</b><br/><b>Retirement Money Market Portfolio</b></font> <font style="FONT-FAMILY: Times New Roman" size="3"> www.fidelity.com</font> 0.0089 0.0001 <font style="FONT-FAMILY: Times New Roman" size="5"><b>Fund Summary</b></font><br/><br/><font style="FONT-FAMILY: Times New Roman" size="3"><b>Fund:</b><br/><b>Retirement Government Money Market Portfolio</b></font> <font style="FONT-FAMILY: Times New Roman" size="3">www.fidelity.com</font> 0.0001 0.0083 FIDELITY MONEY MARKET TRUST <font style="FONT-FAMILY: Times New Roman" size="3">The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund. </font> <font style="FONT-FAMILY: Times New Roman" size="3"><b>Shareholder fees</b></font><br/><font size="-2"><b>(fees paid directly from your investment)</b></font> <font style="FONT-FAMILY: Times New Roman" size="3"><b>Annual fund operating expenses</b></font><br/><font size="-2"><b>(expenses that you pay each year as a % of the value of your investment)</b></font> <table border="1" width="95%"><tr><td><div align="left"><i><font size="-1">During the periods shown in the chart:</font></i> </div></td><td valign="bottom" align="center"><div align="center"><i><font size="-2">Returns</font></i> </div></td><td valign="bottom" align="center"><div align="center"><i><font size="-2">Quarter ended</font></i></div></td></tr><tr><td><div align="left"><i><font size="-1">Highest Quarter Return</font></i> </div></td><td><div align="right"><i><font size="-1">1.29%</font></i> </div></td><td><div align="left"><i><font size="-1">September 30, 2007</font></i></div></td></tr><tr><td><div align="left"><i><font size="-1">Lowest Quarter Return</font></i> </div></td><td><div align="right"><i><font size="-1">0.00%</font></i> </div></td><td><div align="left"><i><font size="-1">March 31, 2011</font></i></div></td></tr><tr><td><div align="left"><i><font size="-1">Year-to-Date Return</font></i> </div></td><td><div align="right"><i><font size="-1">0.01%</font></i> </div></td><td><div align="left"><i><font size="-1">September 30, 2012</font></i></div></td></tr></table> <font style="FONT-FAMILY: Times New Roman" size="3"> The information illustrates the changes in the performance of the fund's shares from year to year.</font> 43 <div style="display:none">~ http://www.fidelity.com/role/ScheduleAnnualFundOperatingExpensesRetirementMoneyMarketPortfolio column period compact * ~</div> <div style="display:none">~ http://www.fidelity.com/role/ScheduleAnnualTotalReturnsRetirementMoneyMarketPortfolioBarChart column period compact * ~</div> <font style="FONT-FAMILY: Times New Roman" size="3">The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.</font> <font style="FONT-FAMILY: Times New Roman" size="3"><b>Shareholder fees</b></font><br/><font size="-2"><b>(fees paid directly from your investment)</b></font> <font style="FONT-FAMILY: Times New Roman" size="3"><b>Annual fund operating expenses</b></font><br/><font size="-2"><b>(expenses that you pay each year as a % of the value of your investment)</b></font> <table border="1" width="95%"><tr><td><div align="left"><i><font size="-1">During the periods shown in the chart:</font></i> </div></td><td valign="bottom" align="center"><div align="center"><i><font size="-2">Returns</font></i> </div></td><td valign="bottom" align="center"><div align="center"><i><font size="-2">Quarter ended</font></i></div></td></tr><tr><td><div align="left"><i><font size="-1">Highest Quarter Return</font></i> </div></td><td><div align="right"><i><font size="-1">1.26%</font></i> </div></td><td><div align="left"><i><font size="-1">December 31, 2006</font></i></div></td></tr><tr><td><div align="left"><i><font size="-1">Lowest Quarter Return</font></i> </div></td><td><div align="right"><i><font size="-1">0.00%</font></i> </div></td><td><div align="left"><i><font size="-1">March 31, 2010</font></i></div></td></tr><tr><td><div align="left"><i><font size="-1">Year-to-Date Return</font></i> </div></td><td><div align="right"><i><font size="-1">0.01%</font></i> </div></td><td><div align="left"><i><font size="-1">September 30, 2012</font></i></div></td></tr></table> <font style="FONT-FAMILY: Times New Roman" size="3">The information illustrates the changes in the performance of the fund's shares from year to year.</font> 43 <div style="display:none">~ http://www.fidelity.com/role/ScheduleAnnualFundOperatingExpensesRetirementGovernmentMoneyMarketPortfolio column period compact * ~</div> 2012-10-29 2012-08-31 485BPOS 0000276516 <font style="FONT-FAMILY: Times New Roman" size="4"><b>Investment Objective</b></font> <font style="FONT-FAMILY: Times New Roman" size="3">This <b>example</b> helps compare the cost of investing in the fund with the cost of investing in other mutual funds.<br/><br/>Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:</font> <font style="FONT-FAMILY: Times New Roman" size="4"><b>Principal Investment Strategies</b></font> <ul><li><font style="FONT-FAMILY: Times New Roman" size="3"><i>Interest Rate Changes.</i> Interest rate increases can cause the price of a money market security to decrease.</font></li><li><font style="FONT-FAMILY: Times New Roman" size="3"><i>Foreign Exposure.</i> Entities located in foreign countries can be affected by adverse political, regulatory, market, or economic developments in those countries. </font></li><li><font style="FONT-FAMILY: Times New Roman" size="3"><i>Financial Services Exposure.</i> Changes in government regulation and interest rates and economic downturns can have a significant negative effect on issuers in the financial services sector, including the price of their securities or their ability to meet their payment obligations.</font></li><li><font style="FONT-FAMILY: Times New Roman" size="3"><i>Issuer-Specific Changes.</i> A decline in the credit quality of an issuer or a provider of credit support or a maturity-shortening structure for a security can cause the price of a money market security to decrease.</font></li></ul> <font style="FONT-FAMILY: Times New Roman" size="3"> 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. 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.</font> <font style="FONT-FAMILY: Times New Roman" size="4"><b>Average Annual Returns</b></font><br/><font style="FONT-FAMILY: Times New Roman" size="2">For the periods ended <br/>December 31, 2011 </font> 0.0042 135 0.0157 0.0001 0.0199 2007-09-30 0.0129 <font style="FONT-FAMILY: Times New Roman" size="2"> <i> Lowest Quarter Return</i></font> 2011-03-31 <font style="FONT-FAMILY: Times New Roman" size="4"><b>Investment Objective</b></font> <font style="FONT-FAMILY: Times New Roman" size="3">This <b>example</b> helps compare the cost of investing in the fund with the cost of investing in other mutual funds.<br/><br/>Let's say, hypothetically, that the annual return for shares of the fund is 5% and that your shareholder fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated: </font> <font style="FONT-FAMILY: Times New Roman" size="4"><b>Principal Investment Strategies</b></font> <ul><li><font style="FONT-FAMILY: Times New Roman" size="3"><i>Interest Rate Changes.</i> Interest rate increases can cause the price of a money market security to decrease.</font></li><li><font style="FONT-FAMILY: Times New Roman" size="3"><i>Issuer-Specific Changes.</i> A decline in the credit quality of an issuer or a provider of credit support or a maturity-shortening structure for a security can cause the price of a money market security to decrease.</font></li></ul> <font style="FONT-FAMILY: Times New Roman" size="3"> 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. 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.</font> <font style="FONT-FAMILY: Times New Roman" size="4"><b>Average Annual Returns</b></font><br/><font style="FONT-FAMILY: Times New Roman" size="2">For the periods ended <br/>December 31, 2011 </font> 2006-12-31 0.0126 2010-03-31 0.0042 135 0.0154 0.0001 0.0185 <div style="display:none">~ http://www.fidelity.com/role/ScheduleAnnualTotalReturnsRetirementGovernmentMoneyMarketPortfolioBarChart column period compact * ~</div> false 2012-10-30 2012-10-30 <font style="FONT-FAMILY: Times New Roman" size="3">The fund seeks to obtain as high a level of current income as is consistent with the preservation of capital and liquidity.</font> <font style="FONT-FAMILY: Times New Roman" size="4"><b>Fee Table</b></font> <ul><li><font style="FONT-FAMILY: Times New Roman" size="3">Investing in U.S. dollar-denominated money market securities of domestic and foreign issuers and repurchase agreements.</font></li><li><font style="FONT-FAMILY: Times New Roman" size="3">Potentially entering into reverse repurchase agreements.</font></li><li><font style="FONT-FAMILY: Times New Roman" size="3">Investing more than 25% of total assets in the financial services industries.</font></li><li><font style="FONT-FAMILY: Times New Roman" size="3">Investing in compliance with industry-standard regulatory requirements for money market funds for the quality, maturity, and diversification of investments.</font></li></ul> <font style="FONT-FAMILY: Times New Roman" size="4"><b>Principal Investment Risks</b></font> <font style="FONT-FAMILY: Times New Roman" size="4"><b>Performance</b></font> <font style="FONT-FAMILY: Times New Roman" size="3">The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year. Past performance is not an indication of future performance.<br/><br/>Visit www.fidelity.com for updated return information. </font> <font style="FONT-FAMILY: Times New Roman" size="4"><b>Year-by-Year Returns</b></font><br/><font style="FONT-FAMILY: Times New Roman" size="2">Calendar Years</font> <font style="FONT-FAMILY: Times New Roman" size="3"> 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.</font> <font style="FONT-FAMILY: Times New Roman" size="3"> 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.</font> <font style="FONT-FAMILY: Times New Roman" size="3"> Past performance is not an indication of future performance.</font> 0 0.0042 0 0 530 0.0107 0.0296 0.0482 0.0512 0.0293 0.0063 0.0002 0.0001 0.0172 <font style="FONT-FAMILY: Times New Roman" size="2"><i>Highest Quarter Return</i></font> 0 <font style="FONT-FAMILY: Times New Roman" size="2"> <i>Year-to-Date Return</i></font> <div style="display:none">~ http://www.fidelity.com/role/ScheduleAverageAnnualTotalReturnsTransposedRetirementMoneyMarketPortfolio column period compact * ~</div> <div style="display:none">~ http://www.fidelity.com/role/ScheduleExpenseExampleRetirementMoneyMarketPortfolio column period compact * ~</div> <font style="FONT-FAMILY: Times New Roman" size="3">The fund seeks as high a level of current income as is consistent with the security of principal and liquidity.</font> <font style="FONT-FAMILY: Times New Roman" size="4"><b>Fee Table</b></font> <ul><li><font style="FONT-FAMILY: Times New Roman" size="3">Normally investing at least 80% of assets in U.S. Government securities and repurchase agreements for those securities.</font></li><li><font style="FONT-FAMILY: Times New Roman" size="3">Investing in U.S. Government securities issued by entities that are chartered or sponsored by Congress but whose securities are neither issued nor guaranteed by the U.S. Treasury.</font></li><li><font style="FONT-FAMILY: Times New Roman" size="3">Potentially entering into reverse repurchase agreements.</font></li><li><font style="FONT-FAMILY: Times New Roman" size="3">Investing in compliance with industry-standard regulatory requirements for money market funds for the quality, maturity, and diversification of investments.</font></li></ul> <font style="FONT-FAMILY: Times New Roman" size="4"><b>Principal Investment Risks</b></font> <font style="FONT-FAMILY: Times New Roman" size="4"><b>Performance</b></font> <font style="FONT-FAMILY: Times New Roman" size="3">The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year. Past performance is not an indication of future performance.<br/><br/>Visit www.fidelity.com for updated return information.</font> <font style="FONT-FAMILY: Times New Roman" size="4"><b>Year-by-Year Returns</b></font><br/><font style="FONT-FAMILY: Times New Roman" size="2">Calendar Years</font> <font style="FONT-FAMILY: Times New Roman" size="3"> 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.</font> <font style="FONT-FAMILY: Times New Roman" size="3">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.</font> <font style="FONT-FAMILY: Times New Roman" size="3">Past performance is not an indication of future performance.</font> <font style="FONT-FAMILY: Times New Roman" size="2"><i>Highest Quarter Return</i></font> <font style="FONT-FAMILY: Times New Roman" size="2"><i>Lowest Quarter Return</i></font> 0 <font style="FONT-FAMILY: Times New Roman" size="2"><i>Year-to-Date Return</i></font> 0 0.0042 0 0 530 0.0103 0.0288 0.0474 0.0493 0.0237 0.0029 0.0001 0.0001 <div style="display:none">~ http://www.fidelity.com/role/ScheduleExpenseExampleRetirementGovernmentMoneyMarketPortfolio column period compact * ~</div> <div style="display:none">~ http://www.fidelity.com/role/ScheduleAverageAnnualTotalReturnsTransposedRetirementGovernmentMoneyMarketPortfolio column period compact * ~</div> <font style="FONT-FAMILY: Times New Roman" size="2"><b>Retirement Government Money Market Portfolio</b></font> <font style="FONT-FAMILY: Times New Roman" size="2"><b>Retirement Money Market Portfolio</b></font> <ul><li><font style="FONT-FAMILY: Times New Roman" size="3">Investing more than 25% of total assets in the financial services industries.</font></li></ul> 0.0151