485BPOS

Filed electronically with the Securities and Exchange Commission on October 10, 2013

 File No. 002-78122

 File No. 811-03495

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM N-1A

REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933	|___|
Pre-Effective Amendment _____	|___|
Post-Effective Amendment No. 62	| X |
and/or
REGISTRATION STATEMENT UNDER THE
INVESTMENT COMPANY ACT OF 1940	|___|
Amendment No. 58	| X |

DWS MONEY MARKET TRUST

 (Exact name of Registrant as Specified in Charter)

345 Park Avenue, New York, NY            10154

(Address of Principal Executive Offices)     (Zip Code)

Registrant’s Telephone Number, including Area Code:  (617) 295-1000

John Millette

Deutsche Investment Management Americas Inc.

One Beacon Street

Boston Massachusetts  02108

(Name and Address of Agent for Service)

Copy to:

David A. Sturms, Esq.

Vedder Price P.C.

222 North LaSalle Street

Chicago, Illinois 60601

It is proposed that this filing will become effective (check appropriate box):

|X|	Immediately upon filing pursuant to paragraph (b)
|__ |	On _____________ pursuant to paragraph (b)
|__|	60 days after filing pursuant to paragraph (a)(1)
|__|	On _____________ pursuant to paragraph (a)(1)
|__|	75 days after filing pursuant to paragraph (a)(2)
|__|	On ____________ pursuant to paragraph (a)(2) of Rule 485
|__|	Pursuant to paragraph (a)(3) of Rule 485
	If appropriate, check the following box:
|__|	This post-effective amendment designates a new effective date for a previously filed post-effective amendment.

This filing relates solely to the following Fund, a series of the Registrant:

·   Daily Assets Fund Institutional

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933 and the Investment Company Act of 1940, the Registrant certifies that it meets all of the requirements for effectiveness of this Registration Statement pursuant to Rule 485(b) under the Securities Act of 1933 and has duly caused this amendment to its Registration Statement to be signed on its behalf by the undersigned, thereto duly authorized, in the City of New York and the State of New York on the 7th day of October 2013.

DWS MONEY MARKET TRUST

By:  /s/Robert Kendall

Robert Kendall*

President

Pursuant to the requirements of the Securities Act of 1933, this Post-Effective Amendment to its Registration Statement has been signed below by the following persons in the capacities and on the dates indicated:

SIGNATURE	TITLE		DATE
/s/Robert Kendall
Robert Kendall*		President		October 7, 2013
/s/Paul H. Schubert
Paul H. Schubert		Chief Financial Officer and Treasurer		October 7, 2013
/s/John W. Ballantine
John W. Ballantine*		Trustee		October 7, 2013
/s/Henry P. Becton, Jr.
Henry P. Becton, Jr.*		Trustee		October 7, 2013
/s/Dawn-Marie Driscoll
Dawn-Marie Driscoll*		Trustee		October 7, 2013
/s/Keith R. Fox
Keith R. Fox*		Trustee		October 7, 2013
/s/Paul K. Freeman
Paul K. Freeman*		Trustee		October 7, 2013
/s/Kenneth C. Froewiss
Kenneth C. Froewiss*		Chairperson and Trustee		October 7, 2013
/s/Richard J. Herring
Richard J. Herring*		Trustee		October 7, 2013
/s/William McClayton
William McClayton*		Vice Chairperson and Trustee		October 7, 2013
/s/Rebecca W. Rimel
Rebecca W. Rimel*		Trustee		October 7, 2013
/s/William N. Searcy, Jr.
William N. Searcy, Jr.*		Trustee		October 7, 2013
/s/Jean Gleason Stromberg
Jean Gleason Stromberg*		Trustee		October 7, 2013
/s/Robert H. Wadsworth
Robert H. Wadsworth*		Trustee		October 7, 2013

*By:           

/s/Caroline Pearson

Caroline Pearson**

Chief Legal Officer

** Attorney-in-fact pursuant to the powers of attorney as filed herein and that are incorporated herein by reference to Post-Effective Amendment No. 45 to the Registration Statement, as filed on April 29, 2008.

Cash Account Trust Cash Management Portfolio Cash Reserve Fund, Inc. DWS Equity 500 Index Portfolio DWS Global High Income Fund,       Inc. DWS Global/International Fund,       Inc. DWS High Income Opportunities Fund, Inc. DWS High Income Trust DWS Income Trust DWS Institutional Funds   DWS International Fund, Inc. DWS Investment Trust DWS Investments VIT Funds DWS Market Trust DWS Money Funds DWS Money Market Trust DWS Multi-Market Income Trust DWS Municipal Income Trust DWS Municipal Trust DWS Portfolio Trust DWS Securities Trust DWS State Tax-Free Income      Series   DWS Strategic Income Trust DWS Strategic Municipal Income Trust DWS Target Date Series DWS Target Fund DWS Tax Free Trust DWS Value Series, Inc. DWS Variable Series I DWS Variable Series II Investors Cash Trust Tax-Exempt California Money Market Fund  

(each a “Fund”)

Power of Attorney

KNOW ALL PERSONS BY THESE PRESENTS, that the following person, whose signature appears below, does hereby constitute and appoint Scott Hogan, John Millette and Caroline Pearson, and each of them, severally, with full powers of substitution, his true and lawful attorney and agent to execute in his name, place and stead (in such capacity) any and all amendments to enable the Fund to comply with the Securities Act of 1933, as amended (the “1933 Act”) and/or the Investment Company Act of 1940, as amended (the “1940 Act”), and any rules, regulations or requirements of the Securities and Exchange Commission in respect thereof, in connection with the Fund’s Registration Statement pursuant to the 1933 Act and/or the 1940 Act, together with any and all pre- and post-effective amendments thereto, including specifically, but without limiting the generality of the foregoing, the power and authority to sign in the name and on behalf of the undersigned as President of the Fund such Registration Statement and any and all such pre- and post-effective amendments filed with the Securities and Exchange Commission under the 1933 Act and/or the 1940 Act, and any other instruments or documents related thereto, and the undersigned does hereby ratify and confirm all that each said attorney-in-fact and agent, or may substitute or substitutes therefor, shall lawfully do or cause to be done by virtue hereof.

SIGNATURE	TITLE	DATE
/s/Robert Kendall Robert Kendall	President	October 3, 2013

DWS FUNDS BOARD

CERTIFICATE OF THE SECRETARY

I, John Millette, do hereby certify as follows:

1.   That I am the duly elected Secretary of the Funds listed on the attached Appendix A, (each a “Fund,” and each Fund’s underlying portfolios, if applicable, a “Series”);

2.   I further certify that the following is a complete and correct copy of resolutions adopted by all of the members of the Board of Directors/Trustees of the Funds by written consent effective October 3, 2013, and that such resolutions have not been amended and are in full force and effect:

WHEREAS, the President of the Fund, Robert Kendall, desires to execute a Power of Attorney and thereby delegate legal authority to the below-designated individuals to sign Registration Statements, including any amendments, on his behalf:

NOW THEREFORE BE IT:

RESOLVED, that the following individuals be, and they hereby are, and each of them hereby is, given a Power of Attorney in substantially the form presented to the Board, with such changes as the officers, with the advice of counsel, shall recommend, to sign the Fund’s Registration Statements, including any amendments:

Scott Hogan

John Millette

Caroline Pearson; and

FURTHER RESOLVED, that any Registration Statement signed pursuant to such Power of Attorney shall comply with Rule 483 (b) of the Securities Act of 1933 as amended, including, but not limited to the inclusion of: (1) a copy of the authorizing Power of Attorney; and (2) a certified copy of the resolutions of the Board authorizing such delegation as Exhibits thereto.

IN WITNESS WHEREOF, I hereunto set my hand this third day of October, 2013.

 /s/John Millette

 John Millette

 Secretary

APPENDIX A

CASH ACCOUNT TRUST, and its series: Government & Agency Securities Portfolio Money Market Portfolio Tax-Exempt Portfolio   CASH MANAGEMENT PORTFOLIO   CASH RESERVE FUND, INC., and its series: Prime Series   DWS EQUITY 500 INDEX PORTFOLIO   DWS GLOBAL HIGH INCOME FUND, INC.   DWS GLOBAL/INTERNATIONAL FUND, INC., and its series: DWS Enhanced Emerging Markets Fixed Income Fund DWS Enhanced Global Bond Fund DWS Global Growth Fund DWS Global Small Cap Growth Fund DWS RREEF Global Infrastructure Fund   DWS HIGH INCOME OPPORTUNITIES FUND, INC.   DWS HIGH INCOME TRUST   DWS INCOME TRUST, and its series: DWS Core Fixed Income Fund DWS Global High Income Fund DWS Global Inflation Fund DWS GNMA Fund DWS High Income Fund DWS Short Duration Fund DWS Strategic Government Securities Fund DWS Ultra-Short Duration Fund DWS Unconstrained Income Fund   DWS INSTITUTIONAL FUNDS, and its series: DWS EAFE Equity Index Fund DWS Equity 500 Index Fund DWS S&P 500 Index Fund DWS U.S. Bond Index Fund   DWS PORTFOLIO TRUST, and its series: DWS Core Plus Income Fund DWS Floating Rate Fund           DWS INTERNATIONAL FUND, INC., and its series: DWS Emerging Markets Equity Fund DWS Global Equity Fund DWS International Fund DWS International Value Fund DWS Latin America Equity Fund DWS World Dividend Fund   DWS INVESTMENT TRUST, and its series: DWS Capital Growth Fund DWS Core Equity Fund DWS Large Cap Focus Growth Fund DWS Mid Cap Growth Fund DWS Small Cap Core Fund DWS Small Cap Growth Fund   DWS INVESTMENTS VIT FUNDS, and its series: DWS Equity 500 Index VIP DWS Small Cap Index VIP   DWS MARKET TRUST, and its series: DWS Alternative Asset Allocation Fund DWS Diversified Market Neutral Fund DWS Global Income Builder Fund DWS Select Alternative Allocation Fund   DWS MONEY FUNDS, and its series: DWS Money Market Prime Series   DWS MONEY MARKET TRUST, and its series Cash Management Fund Cash Reserve Fund Institutional Daily Assets Fund Institutional DWS Money Market Series NY Tax Free Money Fund Tax Free Money Fund Investment   DWS MULTI-MARKET INCOME TRUST   DWS MUNICIPAL INCOME TRUST   DWS MUNICIPAL TRUST, and its series: DWS Managed Municipal Bond Fund DWS Short-Term Municipal Bond Fund DWS Strategic High Yield Tax-Free Fund   DWS TAX FREE TRUST, and its series DWS Intermediate Tax/AMT Free Fund      

DWS SECURITIES TRUST, and its series: DWS Communications Fund DWS Enhanced Commodity Strategy Fund DWS Gold & Precious Metals Fund DWS Health Care Fund DWS RREEF Global Real Estate Securities Fund DWS RREEF Real Estate Securities Fund DWS RREEF Real Estate Securities Income Fund DWS Technology Fund DWS STATE TAX-FREE INCOME SERIES, and its series: DWS California Tax-Free Income Fund DWS Massachusetts Tax-Free Fund DWS New York Tax-Free Income Fund DWS STRATEGIC INCOME TRUST DWS STRATEGIC MUNICIPAL INCOME TRUST DWS TARGET DATE SERIES, and its series: DWS LifeCompass 2015 Fund DWS LifeCompass 2020 Fund DWS LifeCompass 2030 Fund DWS LifeCompass 2040 Fund DWS LifeCompass Retirement Fund DWS TARGET FUND, and its series: DWS Target 2014 Fund DWS VALUE SERIES, INC. and its series: DWS Equity Dividend Fund DWS Large Cap Value Fund DWS Mid Cap Value Fund DWS Small Cap Value Fund DWS VARIABLE SERIES I, and its series DWS Bond VIP DWS Capital Growth VIP DWS Core Equity VIP DWS Global Small Cap Growth VIP DWS International VIP DWS VARIABLE SERIES II, and its series DWS Alternative Asset Allocation VIP DWS Global Equity VIP DWS Global Growth VIP DWS Global Income Builder VIP DWS Government & Agency Securities VIP DWS High Income VIP DWS Large Cap Value VIP DWS Money Market VIP DWS Small Mid Cap Growth VIP DWS Small Mid Cap Value VIP DWS Unconstrained Income VIP INVESTORS CASH TRUST, and its series: Central Cash Management Fund DWS Variable NAV Money Fund Treasury Portfolio TAX-EXEMPT CALIFORNIA MONEY MARKET FUND

EXHIBIT INDEX

Index No.	Description of Exhibit
EX-101.INS	XBRL Instance Document
EX-101.SCH	XBRL Taxonomy Extension Schema Document
EX-101.CAL	XBRL Taxonomy Extension Calculation Linkbase
EX-101.DEF	XBRL Taxonomy Extension Definition Linkbase
EX-101.LAB	XBRL Taxonomy Extension Labels Linkbase
EX-101.PRE	XBRL Taxonomy Extension Presentation Linkbase

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	DWS MONEY MARKET TRUST
Prospectus Date	rr_ProspectusDate	Oct. 01, 2013
Daily Assets Fund Institutional
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	Daily Assets Fund Institutional
Objective [Heading]	rr_ObjectiveHeading	Investment Objective
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The fund seeks a high level of current income consistent with liquidity and the preservation of capital.
Expense [Heading]	rr_ExpenseHeading	Fees and Expenses of the Fund
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	These are the fees and expenses you may pay when you buy and hold shares.
Shareholder Fees Caption [Text]	rr_ShareholderFeesCaption	SHAREHOLDER FEES (paid directly from your investment)
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a % of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	October 31, 2014
Expense Footnotes [Text Block]	rr_ExpenseFootnotesTextBlock	The Advisor has contractually agreed through October 31, 2014 to waive its fees and/or reimburse certain operating expenses of the fund to the extent necessary to maintain the total annual operating expenses (excluding certain expenses such as extraordinary expenses, taxes, brokerage and interest expenses) at 0.18%. The agreement may only be terminated with the consent of the fund's Board.
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 and that the fund's operating expenses (including one year of capped expenses for each period) remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading]	rr_StrategyHeading	Principal Investment Strategy
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	The fund is managed in accordance with Rule 2a-7 under the Investment Company Act of 1940, as amended, which governs the quality, maturity, diversity and liquidity of instruments in which a money market fund may invest. The fund invests in high quality, short-term, US dollar denominated money market instruments, including obligations of US and foreign banks, corporate obligations, US government securities, municipal securities, repurchase agreements and asset backed securities, paying a fixed, variable or floating interest rate. Under normal market conditions, the fund will invest more than 25% of its total assets in the obligations of banks and other financial institutions that satisfy the fund's eligibility requirements. The fund may invest up to 10% of its total assets in other money market funds. Working in consultation with portfolio management, a credit team screens potential securities and develops a list of those that the fund may buy. Portfolio management, looking for attractive yield and weighing considerations such as credit quality, economic outlooks and possible interest rate movements, then decides which securities on this list to buy.
Strategy Portfolio Concentration [Text]	rr_StrategyPortfolioConcentration	Under normal market conditions, the fund will invest more than 25% of its total assets in the obligations of banks and other financial institutions that satisfy the fund's eligibility requirements.
Risk [Heading]	rr_RiskHeading	Main Risks
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	There are several risk factors that could reduce the yield you get from the fund, cause the fund's performance to trail that of other investments, or cause you to lose money. Money market fund risk. An investment in the fund is not insured or guaranteed by the FDIC or any other government agency. Although the fund seeks to preserve the value of your investment at $1.00 per share, this share price isn't guaranteed, and if it falls below $1.00 you would lose money. The Advisor is not obligated to take any action to maintain the $1.00 share price. The share price could fall below $1.00 as a result of the actions of one or more large investors in the fund. The credit quality of the fund's holdings can change rapidly in certain markets, and the default of a single holding could cause the fund's share price to fall below $1.00, as could periods of high redemption pressures and/or illiquid markets. Interest rate risk. Rising interest rates could cause the value of the fund's investments — and therefore its share price as well — to decline. Conversely, any decline in interest rates is likely to cause the fund's yield to decline, and during periods of unusually low interest rates, the fund's yield may approach zero. A low interest rate environment may prevent the fund from providing a positive yield or paying fund expenses out of current income and, at times, could impair the fund's ability to maintain a stable $1.00 share price. Over time, the total return of a money market fund may not keep pace with inflation, which could result in a net loss of purchasing power for long-term investors. Credit risk. The fund's performance could be hurt and the fund's share price could fall below $1.00 if an issuer of a money market instrument suffers an adverse change in financial condition that results in a payment default, security downgrade or inability to meet a financial obligation. Liquidity risk. The liquidity of portfolio securities can deteriorate rapidly due to credit events affecting issuers or guarantors or due to general market conditions and a lack of willing buyers. When there are no willing buyers and an instrument cannot be readily sold at a desired time or price, the fund may have to accept a lower price or may not be able to sell the instrument at all. An inability to sell one or more portfolio securities can adversely affect the fund's ability to maintain a $1.00 share price or prevent the fund from being able to take advantage of other investment opportunities. Unusual market conditions, an unusually high volume of redemption requests or other similar conditions could cause the fund to be unable to pay redemption proceeds within a short period of time. If the fund is forced to sell securities at an unfavorable time and/or under unfavorable conditions, such sales may adversely affect the fund's ability to maintain a $1.00 share price. Security selection risk. Although short-term securities are relatively stable investments, it is possible that the securities in which the fund invests will not perform as expected. This could cause the fund's returns to lag behind those of similar money market funds and could result in a decline in share price. Municipal securities risk. The fund will be impacted by events in the municipal securities market. Negative events, such as severe fiscal difficulties, bankruptcy of one or more issuers, an economic downturn, unfavorable legislation, court rulings or political developments, or reduced monetary support from the federal government could hurt fund performance. Repurchase agreement risk. If the party that sells the securities to the fund defaults on its obligation to repurchase them at the agreed-upon time and price, the fund could lose money. Counterparty risk. A financial institution or other counterparty with whom the fund does business, or that underwrites, distributes or guarantees any investments or contracts that the fund owns or is otherwise exposed to, may decline in financial health and become unable to honor its commitments. This could cause losses for the fund or could delay the return or delivery of collateral or other assets to the fund. Concentration risk. Any fund that concentrates in a particular segment of the market will generally be more volatile than a fund that invests more broadly. Any market price movements, regulatory or technological changes, or economic conditions affecting banks or financial institutions will have a significant impact on the fund's performance. Prepayment and extension risk. When interest rates fall, issuers of high interest debt obligations may pay off the debts earlier than expected (prepayment risk), and the fund may have to reinvest the proceeds at lower yields. When interest rates rise, issuers of lower interest debt obligations may pay off the debts later than expected (extension risk), thus keeping the fund's assets tied up in lower interest debt obligations. Ultimately, any unexpected behavior in interest rates could increase the volatility of the fund's yield and could hurt fund performance. Prepayments could also create capital gains tax liability in some instances. Foreign investment risk. Foreign investments include certain special risks, such as unfavorable political and legal developments, limited financial information, regulatory risk and economic and financial instability. Regulatory risk. In June 2013, the SEC proposed money market fund reform intended to address perceived systemic risks associated with money market funds and to improve transparency for money market fund investors. The Financial Stability Oversight Council (FSOC), a board of U.S. regulators established by the Dodd-Frank Act, had also previously proposed similar recommendations for money market fund reform. If one or more of the SEC or FSOC proposals for money market fund reform were to be adopted in the future, such regulatory action may affect the fund's operations and/or return potential.
Risk Lose Money [Text]	rr_RiskLoseMoney	There are several risk factors that could reduce the yield you get from the fund, cause the fund's performance to trail that of other investments, or cause you to lose money.
Risk Money Market Fund [Text]	rr_RiskMoneyMarketFund	An investment in the fund is not insured or guaranteed by the FDIC or any other government agency. Although the fund seeks to preserve the value of your investment at $1.00 per share, this share price isn't guaranteed, and if it falls below $1.00 you would lose money. The Advisor is not obligated to take any action to maintain the $1.00 share price. The share price could fall below $1.00 as a result of the actions of one or more large investors in the fund. The credit quality of the fund's holdings can change rapidly in certain markets, and the default of a single holding could cause the fund's share price to fall below $1.00, as could periods of high redemption pressures and/or illiquid markets.
Risk Not Insured Depository Institution [Text]	rr_RiskNotInsuredDepositoryInstitution	An investment in the fund is not insured or guaranteed by the FDIC or any other government agency.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	Past Performance
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	How a fund's returns vary from year to year can give an idea of its risk. Past performance may not indicate future results. All performance figures below assume that dividends were reinvested. The 7-day yield, which is often referred to as the "current yield," is the income generated by the fund over a seven-day period. This amount is then annualized, which means that we assume the fund generates the same income every week for a year. For more recent performance figures and the current yield, go to www.dbadvisorsliquidity.com/US (the Web site does not form a part of this prospectus) or call the phone number included in this prospectus.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	How a fund's returns vary from year to year can give an idea of its risk.
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	www.dbadvisorsliquidity.com/US
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	Past performance may not indicate future results.
Bar Chart [Heading]	rr_BarChartHeading	CALENDAR YEAR TOTAL RETURNS (%)
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Best Quarter: 1.36%, Q3 2007 Worst Quarter: 0.04%, Q3 2011 Year-to-Date as of 6/30/13: 0.07%
Performance Table Heading	rr_PerformanceTableHeading	Average Annual Total Returns (for periods ended 12/31/2012 expressed as a %)
Performance Table Closing [Text Block]	rr_PerformanceTableClosingTextBlock	Total returns would have been lower if operating expenses hadn't been reduced.
Daily Assets Fund Institutional | Institutional Class
Risk/Return:	rr_RiskReturnAbstract
SHAREHOLDER FEES (paid directly from your investment)	rr_ShareholderFeeOther	none
Management fee	rr_ManagementFeesOverAssets	0.10%
Distribution/Service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.11%
Total annual fund operating expenses	rr_ExpensesOverAssets	0.21%
Fee waiver/reimbursement	rr_FeeWaiverOrReimbursementOverAssets	0.03%
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	0.18%
1 Year	rr_ExpenseExampleYear01	18
3 Years	rr_ExpenseExampleYear03	65
5 Years	rr_ExpenseExampleYear05	115
10 Years	rr_ExpenseExampleYear10	$ 265
2003	rr_AnnualReturn2003	1.09%
2004	rr_AnnualReturn2004	1.40%
2005	rr_AnnualReturn2005	3.31%
2006	rr_AnnualReturn2006	5.10%
2007	rr_AnnualReturn2007	5.43%
2008	rr_AnnualReturn2008	3.03%
2009	rr_AnnualReturn2009	0.57%
2010	rr_AnnualReturn2010	0.25%
2011	rr_AnnualReturn2011	0.19%
2012	rr_AnnualReturn2012	0.23%
Year to Date Return, Label	rr_YearToDateReturnLabel	Year-to-Date
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Jun. 30, 2013
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	0.07%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Best Quarter:
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Sep. 30, 2007
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	1.36%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Worst Quarter:
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Sep. 30, 2011
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	0.04%
1 Year	rr_AverageAnnualReturnYear01	0.23%
5 Years	rr_AverageAnnualReturnYear05	0.85%
10 Years	rr_AverageAnnualReturnYear10	2.04%
Class Inception	rr_AverageAnnualReturnInceptionDate	Nov. 13, 1996

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	DWS MONEY MARKET TRUST
Prospectus Date	rr_ProspectusDate	Oct. 01, 2013
Document Creation Date	dei_DocumentCreationDate	Sep. 26, 2013

XML

Daily Assets Fund Institutional

Daily Assets Fund Institutional

Investment Objective

The fund seeks a high level of current income consistent with liquidity and the preservation of capital.

Fees and Expenses of the Fund

These are the fees and expenses you may pay when you buy and hold shares.

SHAREHOLDER FEES

(paid directly from your investment)

Shareholder Fees (USD $)	Daily Assets Fund Institutional Institutional Class
SHAREHOLDER FEES (paid directly from your investment)	none

ANNUAL FUND OPERATING EXPENSES
(expenses that you pay each year as a % of the value of your investment)

Annual Fund Operating Expenses	Daily Assets Fund Institutional Institutional Class
Management fee	0.10%
Distribution/Service (12b-1) fees	none
Other expenses	0.11%
Total annual fund operating expenses	0.21%
Fee waiver/reimbursement	0.03%
Total annual fund operating expenses after fee waiver/expense reimbursement	0.18%

The Advisor has contractually agreed through October 31, 2014 to waive its fees and/or reimburse certain operating expenses of the fund to the extent necessary to maintain the total annual operating expenses (excluding certain expenses such as extraordinary expenses, taxes, brokerage and interest expenses) at 0.18%. The agreement may only be terminated with the consent of the fund's Board.

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 and that the fund's operating expenses (including one year of capped expenses for each period) remain the same. 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
Daily Assets Fund Institutional Institutional Class	18	65	115	265

Principal Investment Strategy

The fund is managed in accordance with Rule 2a-7 under the Investment Company Act of 1940, as amended, which governs the quality, maturity, diversity and liquidity of instruments in which a money market fund may invest.

The fund invests in high quality, short-term, US dollar denominated money market instruments, including obligations of US and foreign banks, corporate obligations, US government securities, municipal securities, repurchase agreements and asset backed securities, paying a fixed, variable or floating interest rate.

Under normal market conditions, the fund will invest more than 25% of its total assets in the obligations of banks and other financial institutions that satisfy the fund's eligibility requirements.

The fund may invest up to 10% of its total assets in other money market funds.

Working in consultation with portfolio management, a credit team screens potential securities and develops a list of those that the fund may buy. Portfolio management, looking for attractive yield and weighing considerations such as credit quality, economic outlooks and possible interest rate movements, then decides which securities on this list to buy.

Main Risks

There are several risk factors that could reduce the yield you get from the fund, cause the fund's performance to trail that of other investments, or cause you to lose money.

Money market fund risk. An investment in the fund is not insured or guaranteed by the FDIC or any other government agency. Although the fund seeks to preserve the value of your investment at $1.00 per share, this share price isn't guaranteed, and if it falls below $1.00 you would lose money. The Advisor is not obligated to take any action to maintain the $1.00 share price. The share price could fall below $1.00 as a result of the actions of one or more large investors in the fund. The credit quality of the fund's holdings can change rapidly in certain markets, and the default of a single holding could cause the fund's share price to fall below $1.00, as could periods of high redemption pressures and/or illiquid markets.

Interest rate risk. Rising interest rates could cause the value of the fund's investments — and therefore its share price as well — to decline. Conversely, any decline in interest rates is likely to cause the fund's yield to decline, and during periods of unusually low interest rates, the fund's yield may approach zero. A low interest rate environment may prevent the fund from providing a positive yield or paying fund expenses out of current income and, at times, could impair the fund's ability to maintain a stable $1.00 share price. Over time, the total return of a money market fund may not keep pace with inflation, which could result in a net loss of purchasing power for long-term investors.

Credit risk. The fund's performance could be hurt and the fund's share price could fall below $1.00 if an issuer of a money market instrument suffers an adverse change in financial condition that results in a payment default, security downgrade or inability to meet a financial obligation.

Liquidity risk. The liquidity of portfolio securities can deteriorate rapidly due to credit events affecting issuers or guarantors or due to general market conditions and a lack of willing buyers. When there are no willing buyers and an instrument cannot be readily sold at a desired time or price, the fund may have to accept a lower price or may not be able to sell the instrument at all. An inability to sell one or more portfolio securities can adversely affect the fund's ability to maintain a $1.00 share price or prevent the fund from being able to take advantage of other investment opportunities.

Unusual market conditions, an unusually high volume of redemption requests or other similar conditions could cause the fund to be unable to pay redemption proceeds within a short period of time. If the fund is forced to sell securities at an unfavorable time and/or under unfavorable conditions, such sales may adversely affect the fund's ability to maintain a $1.00 share price.

Security selection risk. Although short-term securities are relatively stable investments, it is possible that the securities in which the fund invests will not perform as expected. This could cause the fund's returns to lag behind those of similar money market funds and could result in a decline in share price.

Municipal securities risk. The fund will be impacted by events in the municipal securities market. Negative events, such as severe fiscal difficulties, bankruptcy of one or more issuers, an economic downturn, unfavorable legislation, court rulings or political developments, or reduced monetary support from the federal government could hurt fund performance.

Repurchase agreement risk. If the party that sells the securities to the fund defaults on its obligation to repurchase them at the agreed-upon time and price, the fund could lose money.

Counterparty risk. A financial institution or other counterparty with whom the fund does business, or that underwrites, distributes or guarantees any investments or contracts that the fund owns or is otherwise exposed to, may decline in financial health and become unable to honor its commitments. This could cause losses for the fund or could delay the return or delivery of collateral or other assets to the fund.

Concentration risk. Any fund that concentrates in a particular segment of the market will generally be more volatile than a fund that invests more broadly. Any market price movements, regulatory or technological changes, or economic conditions affecting banks or financial institutions will have a significant impact on the fund's performance.

Prepayment and extension risk. When interest rates fall, issuers of high interest debt obligations may pay off the debts earlier than expected (prepayment risk), and the fund may have to reinvest the proceeds at lower yields. When interest rates rise, issuers of lower interest debt obligations may pay off the debts later than expected (extension risk), thus keeping the fund's assets tied up in lower interest debt obligations. Ultimately, any unexpected behavior in interest rates could increase the volatility of the fund's yield and could hurt fund performance. Prepayments could also create capital gains tax liability in some instances.

Foreign investment risk. Foreign investments include certain special risks, such as unfavorable political and legal developments, limited financial information, regulatory risk and economic and financial instability.

Regulatory risk. In June 2013, the SEC proposed money market fund reform intended to address perceived systemic risks associated with money market funds and to improve transparency for money market fund investors. The Financial Stability Oversight Council (FSOC), a board of U.S. regulators established by the Dodd-Frank Act, had also previously proposed similar recommendations for money market fund reform. If one or more of the SEC or FSOC proposals for money market fund reform were to be adopted in the future, such regulatory action may affect the fund's operations and/or return potential.

Past Performance

How a fund's returns vary from year to year can give an idea of its risk. Past performance may not indicate future results. All performance figures below assume that dividends were reinvested. The 7-day yield, which is often referred to as the "current yield," is the income generated by the fund over a seven-day period. This amount is then annualized, which means that we assume the fund generates the same income every week for a year. For more recent performance figures and the current yield, go to www.dbadvisorsliquidity.com/US (the Web site does not form a part of this prospectus) or call the phone number included in this prospectus.

CALENDAR YEAR TOTAL RETURNS (%)

Best Quarter: 1.36%, Q3 2007 Worst Quarter: 0.04%, Q3 2011
Year-to-Date as of 6/30/13: 0.07%

Average Annual Total Returns
(for periods ended 12/31/2012 expressed as a %)

Average Annual Total Returns	Class Inception	1 Year	5 Years	10 Years
Daily Assets Fund Institutional Institutional Class	Nov. 13, 1996	0.23%	0.85%	2.04%

Total returns would have been lower if operating expenses hadn't been reduced.

XML

Document and Entity Information	12 Months Ended
	Oct. 01, 2013
Risk/Return:
Document Type	485BPOS
Document Period End Date	Jun. 30, 2013
Registrant Name	DWS MONEY MARKET TRUST
Central Index Key	0000703642
Amendment Flag	false
Document Creation Date	Sep. 26, 2013
Document Effective Date	Oct. 01, 2013
Prospectus Date	Oct. 01, 2013