485BPOS

Securities Act of 1933 Registration No. 002-73133

Investment Company Act of 1940 Registration No. 811-03221

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM N-1A

REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 x

o Pre-Effective Amendment No.  ______

x Post-Effective Amendment No.  130

and

REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940 x

x Amendment No.  130

Fidelity Charles Street Trust

 (Exact Name of Registrant as Specified in Charter)

245 Summer Street, Boston, Massachusetts 02210

(Address of Principal Executive Offices)(Zip Code)

Registrant’s Telephone Number: 617-563-7000

Marc Bryant, Secretary

245 Summer Street

Boston, Massachusetts 02210

(Name and Address of Agent for Service)

It is proposed that this filing will become effective immediately upon filing pursuant to paragraph (b).

EXHIBIT INDEX

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

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 the effectiveness of this Registration Statement pursuant to Rule 485(b) under the Securities Act of 1933 and has duly caused this Post-Effective Amendment No. 130to the 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 18th day of December 2017.

	Fidelity Charles Street Trust
	By	/s/Stephanie J. Dorsey
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||		Stephanie J. Dorsey, President

Pursuant to the requirements of the Securities Act of 1933, this Registration Statement has been signed below by the following persons in the capacities and on the dates indicated.

(Signature)		(Title)	(Date)
/s/Stephanie J. Dorsey		President and Treasurer	December 18, 2017
Stephanie J. Dorsey		(Principal Executive Officer)
/s/Howard J. Galligan III		Chief Financial Officer	December 18, 2017
Howard J. Galligan III		(Principal Financial Officer)
/s/Abigail P. Johnson	†	Trustee	December 18, 2017
Abigail P. Johnson
/s/Elizabeth S. Acton	*	Trustee	December 18, 2017
Elizabeth S. Acton
/s/John Engler	*	Trustee	December 18, 2017
John Engler
/s/Albert R. Gamper, Jr.	*	Trustee	December 18, 2017
Albert R. Gamper, Jr.
/s/Robert F. Gartland	*	Trustee	December 18, 2017
Robert F. Gartland
/s/Arthur E. Johnson	*	Trustee	December 18, 2017
Arthur E. Johnson
/s/Michael E. Kenneally	*	Trustee	December 18, 2017
Michael E. Kenneally
/s/Marie L. Knowles	*	Trustee	December 18, 2017
Marie L. Knowles
/s/Mark A. Murray	*	Trustee	December 18, 2017
Mark A. Murray
/s/Jennifer Toolin McAuliffe	*	Trustee	December 18, 2017
Jennifer Toolin McAuliffe

†	By:	/s/Marc R. Bryant
		Marc R. Bryant, pursuant to a power of attorney dated December 16, 2015 and filed herewith.
*	By:	/s/Megan C. Johnson
		Megan C. Johnson, pursuant to a power of attorney dated September 1, 2017 and filed herewith.

POWER OF ATTORNEY

I, the undersigned Trustee of the following investment companies:

Fidelity Aberdeen Street Trust Fidelity Advisor Series II Fidelity Advisor Series IV Fidelity Boylston Street Trust Fidelity California Municipal Trust Fidelity California Municipal Trust II Fidelity Central Investment Portfolios II LLC Fidelity Charles Street Trust Fidelity Colchester Street Trust Fidelity Commonwealth Trust II Fidelity Court Street Trust Fidelity Court Street Trust II Fidelity Garrison Street Trust Fidelity Hereford Street Trust Fidelity Income Fund Fidelity Massachusetts Municipal Trust
Fidelity Merrimack Street Trust Fidelity Money Market Trust Fidelity Municipal Trust Fidelity Municipal Trust II Fidelity Newbury Street Trust Fidelity New York Municipal Trust Fidelity New York Municipal Trust II Fidelity Oxford Street Trust Fidelity Oxford Street Trust II Fidelity Phillips Street Trust Fidelity Revere Street Trust Fidelity Salem Street Trust Fidelity School Street Trust Fidelity Union Street Trust Fidelity Union Street Trust II Variable Insurance Products Fund V

in addition to any other Fidelity Fund for which the undersigned individual serves as Trustee (collectively, the “Funds”), hereby constitute and appoint Marc R. Bryant, my true and lawful attorney-in-fact, with full power of substitution, and with full power to sign for me and in my name in the appropriate capacity, all Registration Statements of the Funds on Form N-1A, or any successors thereto, any and all subsequent Amendments, Pre-Effective Amendments, or Post-Effective Amendments to said Registration Statements or any successors thereto, and any supplements or other instruments in connection therewith, and generally to do all such things in my name and behalf in connection therewith as said attorney-in-fact deems necessary or appropriate, to comply with the provisions of the Securities Act of 1933 and the Investment Company Act of 1940, and all related requirements of the Securities and Exchange Commission.  I hereby ratify and confirm all that said attorney-in-fact or his substitutes may do or cause to be done by virtue hereof.  This power of attorney is effective for all documents filed on or after December 16^th, 2015.

WITNESS my hand on this 16th day of December, 2015.

/s/Abigail P. Johnson

Abigail P. Johnson

POWER OF ATTORNEY

We, the undersigned Directors or Trustees, as the case may be, of the following investment companies:

Fidelity Aberdeen Street Trust Fidelity Advisor Series II Fidelity Advisor Series IV Fidelity Boylston Street Trust Fidelity California Municipal Trust Fidelity California Municipal Trust II Fidelity Central Investment Portfolios II LLC Fidelity Charles Street Trust Fidelity Colchester Street Trust Fidelity Court Street Trust Fidelity Court Street Trust II Fidelity Garrison Street Trust Fidelity Hereford Street Trust Fidelity Income Fund Fidelity Massachusetts Municipal Trust Fidelity Merrimack Street Trust Fidelity Money Market Trust Fidelity Municipal Trust Fidelity Municipal Trust II Fidelity Newbury Street Trust Fidelity New York Municipal Trust Fidelity New York Municipal Trust II Fidelity Oxford Street Trust Fidelity Oxford Street Trust II Fidelity Phillips Street Trust Fidelity Revere Street Trust Fidelity Salem Street Trust Fidelity School Street Trust Fidelity Union Street Trust Fidelity Union Street Trust II Variable Insurance Products Fund V

in addition to any other Fidelity Fund for which the undersigned individuals serve as Directors or Trustees (collectively, the “Funds”), hereby revoke all previous powers of attorney we have given to sign and otherwise act in our names and behalf in matters involving any investment company for which FMR or an affiliate acts as investment adviser and hereby constitute and appoint Thomas C. Bogle, John V. O’Hanlon, Robert W. Helm, Megan C. Johnson, and Anthony H. Zacharski, each of them singly, our true and lawful attorneys-in-fact, with full power of substitution, and with full power to each of them, to sign for us and in our names in the appropriate capacities, all Registration Statements of the Funds on Form N-1A, or any successors thereto, any and all subsequent Amendments, Pre-Effective Amendments, or Post-Effective Amendments to said Registration Statements or any successors thereto, and any supplements or other instruments in connection therewith, and generally to do all such things in our names and behalf in connection therewith as said attorneys-in-fact deem necessary or appropriate, to comply with the provisions of the Securities Act of 1933 and the Investment Company Act of 1940, and all related requirements of the Securities and Exchange Commission.  We hereby ratify and confirm all that said attorneys-in-fact or their substitutes may do or cause to be done by virtue hereof.  This power of attorney is effective for all documents filed on or after September 1, 2017.

WITNESS our hands on this first day of September 2017.

/s/Elizabeth S. Acton	/s/Michael E. Kenneally
Elizabeth S. Acton	Michael E. Kenneally
/s/John Engler	/s/Marie L. Knowles
John Engler	Marie L. Knowles
/s/Albert R. Gamper, Jr.	/s/Jennifer Toolin McAuliffe
Albert R. Gamper, Jr.	Jennifer Toolin McAuliffe
/s/Robert F. Gartland	/s/Mark A. Murray
Robert F. Gartland	Mark A. Murray
/s/Arthur E. Johnson
Arthur E. Johnson

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Document Type	dei_DocumentType	485BPOS
Document Period End Date	dei_DocumentPeriodEndDate	Sep. 30, 2017
Registrant Name	dei_EntityRegistrantName	FIDELITY CHARLES STREET TRUST
Central Index Key	dei_EntityCentralIndexKey	0000354046
Amendment Flag	dei_AmendmentFlag	false
Document Creation Date	dei_DocumentCreationDate	Nov. 28, 2017
Document Effective Date	dei_DocumentEffectiveDate	Nov. 29, 2017
Prospectus Date	rr_ProspectusDate	Nov. 29, 2017

XML

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 20%

Fund Summary

Fund/Class:
Fidelity Asset Manager® 20%/Fidelity Advisor Asset Manager® 20% A, M, C, I

Investment Objective

The fund seeks a high level of current income by allocating its assets among stocks, bonds, short-term instruments and other investments. The fund also considers the potential for capital appreciation.

Fee Table

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the fund or certain other Fidelity^® funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page 50 of the prospectus. Different intermediaries may provide additional waivers or reductions of the sales charge. Please see “Sales Charge Waiver Policies Applied by Certain Intermediaries” in the “Appendix” section of the prospectus.

Shareholder fees

(fees paid directly from your investment)

Shareholder Fees {- Fidelity Asset Manager® 20%} - 09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 - Fidelity Asset Manager® 20%	Fidelity Asset Manager 20%-Class A		Fidelity Asset Manager 20%-Class M		Fidelity Asset Manager 20%-Class C		Fidelity Asset Manager 20%-Class I
Maximum sales charge (load) on purchases (as a % of offering price)	5.75%		3.50%		none		none
Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds)	none	[1]	none	[1]	1.00%	[2]	none

Annual Operating Expenses

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

Annual Operating Expenses {- Fidelity Asset Manager® 20%} - 09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 - Fidelity Asset Manager® 20%		Fidelity Asset Manager 20%-Class A	Fidelity Asset Manager 20%-Class M	Fidelity Asset Manager 20%-Class C	Fidelity Asset Manager 20%-Class I
Management fee		0.41%	0.41%	0.41%	0.41%
Distribution and/or Service (12b-1) fees		0.25%	0.50%	1.00%	none
Other expenses		0.18%	0.19%	0.18%	0.15%
Acquired fund fees and expenses		0.01%	0.01%	0.01%	0.01%
Total annual operating expenses	[1]	0.85%	1.11%	1.60%	0.57%

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

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 and if you hold your shares:

Sell All Shares

Expense Example {- Fidelity Asset Manager® 20%} - 09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 - Fidelity Asset Manager® 20% - USD ($)	Fidelity Asset Manager 20%-Class A	Fidelity Asset Manager 20%-Class M	Fidelity Asset Manager 20%-Class C	Fidelity Asset Manager 20%-Class I
1 year	$ 657	$ 459	$ 263	$ 58
3 years	831	691	505	183
5 years	1,019	940	871	318
10 years	$ 1,564	$ 1,654	$ 1,900	$ 714

Hold Shares

Expense Example, No Redemption {- Fidelity Asset Manager® 20%} - 09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 - Fidelity Asset Manager® 20% - USD ($)	Fidelity Asset Manager 20%-Class A	Fidelity Asset Manager 20%-Class M	Fidelity Asset Manager 20%-Class C	Fidelity Asset Manager 20%-Class I
1 Year	$ 657	$ 459	$ 163	$ 58
3 Years	831	691	505	183
5 Years	1,019	940	871	318
10 Years	$ 1,564	$ 1,654	$ 1,900	$ 714

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 operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 22% of the average value of its portfolio.

Principal Investment Strategies

• Allocating the fund's assets among three main asset classes: the stock class (equity securities of all types), the bond class (fixed-income securities of all types maturing in more than one year, including lower-quality debt securities which are sometimes referred to as high yield debt securities or junk bonds), and the short-term/money market class (fixed-income securities of all types maturing in one year or less).

• Maintaining a neutral mix over time of 20% of assets in stocks, 50% of assets in bonds, and 30% of assets in short-term and money market instruments.

• Adjusting allocation among asset classes gradually within the following ranges: stock class (10%-30%), bond class (40%-60%), and short-term/money market class (10%-50%).

• Investing in domestic and foreign issuers.

• Investing in Fidelity's central funds (specialized investment vehicles used by Fidelity^® funds to invest in particular security types or investment disciplines).

Principal Investment Risks

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.

• Foreign Exposure. Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile. Foreign exchange rates also can be extremely volatile.

• Prepayment. The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. 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 security to decrease. Lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds) and certain types of other securities involve greater risk of default or price changes due to changes in the credit quality of the issuer. The value of lower-quality debt securities and certain types of other securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments.

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. You could lose money by investing in the fund.

Performance

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 and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit institutional.fidelity.com for more recent performance information.

The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown.

Year-by-Year Returns

Calendar Years

During the periods shown in the chart for Class A:	Returns	Quarter ended
Highest Quarter Return	8.73%	June 30, 2009
Lowest Quarter Return	-7.79%	December 31, 2008
Year-to-Date Return	5.12%	September 30, 2017

Average Annual Returns

Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges. After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

For the periods ended December 31, 2016

Average Annual Total Returns{- Fidelity Asset Manager® 20%} - 09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 - Fidelity Asset Manager® 20%	Past 1 year	Past 5 years	Past 10 years
Fidelity Asset Manager 20%-Class A | Return Before Taxes	(1.62%)	2.54%	2.99%
Fidelity Asset Manager 20%-Class A | After Taxes on Distributions	(2.31%)	1.50%	1.94%
Fidelity Asset Manager 20%-Class A | After Taxes on Distributions and Sales	(0.82%)	1.67%	1.99%
Fidelity Asset Manager 20%-Class M | Return Before Taxes	0.49%	2.74%	2.97%
Fidelity Asset Manager 20%-Class C | Return Before Taxes	2.55%	2.96%	2.80%
Fidelity Asset Manager 20%-Class I | Return Before Taxes	4.68%	4.02%	3.88%
Bloomberg Barclays U.S. Aggregate Bond Index(reflects no deduction for fees, expenses, or taxes)	2.65%	2.23%	4.34%
Fidelity Asset Manager 20% Composite Index℠(reflects no deduction for fees or expenses)	3.54%	3.66%	3.70%

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 20% | Fidelity Asset Manager 20%-Class A

Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 20% | Fidelity Asset Manager 20%-Class M

Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 20% | Fidelity Asset Manager 20%-Class C

On Class C shares redeemed less than one year after purchase.

[1] Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

[2] On Class C shares redeemed less than one year after purchase.

[1] Differs from the ratios of expenses to average net assets in the Financial Highlights section of the prospectus because of acquired fund fees and expenses.

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY CHARLES STREET TRUST

Prospectus Date

rr_ProspectusDate

Nov. 29, 2017

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 20%

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund/Class:
Fidelity Asset Manager® 20%/Fidelity Advisor Asset Manager® 20% A, M, C, I

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks a high level of current income by allocating its assets among stocks, bonds, short-term instruments and other investments. The fund also considers the potential for capital appreciation.

Expense [Heading]

rr_ExpenseHeading

Fee Table

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the fund or certain other Fidelity^® funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page 50 of the prospectus. Different intermediaries may provide additional waivers or reductions of the sales charge. Please see “Sales Charge Waiver Policies Applied by Certain Intermediaries” in the “Appendix” section of the prospectus.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder fees

(fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Operating Expenses

(expenses that you pay each year as a % 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 operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 22% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

22.00%

Expense Breakpoint Discounts [Text]

rr_ExpenseBreakpointDiscounts

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the fund or certain other Fidelity® funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page 50 of the prospectus.

Expense Breakpoint, Minimum Investment Required [Amount]

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

$ 50,000

Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text]

rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees

Differs from the ratios of expenses to average net assets in the Financial Highlights section of the prospectus because of acquired fund fees and expenses.

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

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 and if you hold your shares:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Sell All Shares

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

rr_ExpenseExampleNoRedemptionByYearCaption

Hold Shares

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

• Allocating the fund's assets among three main asset classes: the stock class (equity securities of all types), the bond class (fixed-income securities of all types maturing in more than one year, including lower-quality debt securities which are sometimes referred to as high yield debt securities or junk bonds), and the short-term/money market class (fixed-income securities of all types maturing in one year or less).

• Maintaining a neutral mix over time of 20% of assets in stocks, 50% of assets in bonds, and 30% of assets in short-term and money market instruments.

• Adjusting allocation among asset classes gradually within the following ranges: stock class (10%-30%), bond class (40%-60%), and short-term/money market class (10%-50%).

• Investing in domestic and foreign issuers.

• Investing in Fidelity's central funds (specialized investment vehicles used by Fidelity^® funds to invest in particular security types or investment disciplines).

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.

• Foreign Exposure. Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile. Foreign exchange rates also can be extremely volatile.

• Prepayment. The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. 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 security to decrease. Lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds) and certain types of other securities involve greater risk of default or price changes due to changes in the credit quality of the issuer. The value of lower-quality debt securities and certain types of other securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments.

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. You could lose money by investing in the fund.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could 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 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 and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit institutional.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

institutional.fidelity.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

rr_BarChartHeading

Year-by-Year Returns

Calendar Years

Bar Chart Narrative [Text Block]

rr_BarChartNarrativeTextBlock

The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown.

Bar Chart Does Not Reflect Sales Loads [Text]

rr_BarChartDoesNotReflectSalesLoads

The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown.

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the periods shown in the chart for Class A:	Returns	Quarter ended
Highest Quarter Return	8.73%	June 30, 2009
Lowest Quarter Return	-7.79%	December 31, 2008
Year-to-Date Return	5.12%	September 30, 2017

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Returns

Performance Table Does Reflect Sales Loads

rr_PerformanceTableDoesReflectSalesLoads

Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges.

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

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

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table One Class of after Tax Shown [Text]

rr_PerformanceTableOneClassOfAfterTaxShown

After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary.

Performance Table Explanation after Tax Higher

rr_PerformanceTableExplanationAfterTaxHigher

Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges. After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

For the periods ended December 31, 2016

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 20% | Fidelity Asset Manager 20%-Class A

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) on purchases (as a % of offering price)

rr_MaximumCumulativeSalesChargeOverOfferingPrice

5.75%

Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds)

rr_MaximumDeferredSalesChargeOverOther

none

^[1]

Management fee

rr_ManagementFeesOverAssets

0.41%

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

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other expenses

rr_OtherExpensesOverAssets

0.18%

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.01%

Total annual operating expenses

rr_ExpensesOverAssets

0.85%

^[2]

Expenses Deferred Charges [Text Block]

rr_ExpensesDeferredChargesTextBlock

Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

1 year

rr_ExpenseExampleYear01

$ 657

3 years

rr_ExpenseExampleYear03

831

5 years

rr_ExpenseExampleYear05

1,019

10 years

rr_ExpenseExampleYear10

1,564

1 Year

rr_ExpenseExampleNoRedemptionYear01

657

3 Years

rr_ExpenseExampleNoRedemptionYear03

831

5 Years

rr_ExpenseExampleNoRedemptionYear05

1,019

10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 1,564

2007

rr_AnnualReturn2007

4.52%

2008

rr_AnnualReturn2008

(14.35%)

2009

rr_AnnualReturn2009

18.98%

2010

rr_AnnualReturn2010

8.72%

2011

rr_AnnualReturn2011

2.24%

2012

rr_AnnualReturn2012

6.53%

2013

rr_AnnualReturn2013

4.92%

2014

rr_AnnualReturn2014

3.71%

2015

rr_AnnualReturn2015

(0.60%)

2016

rr_AnnualReturn2016

4.38%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Sep. 30, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

5.12%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

8.73%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(7.79%)

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 20% | Fidelity Asset Manager 20%-Class M

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) on purchases (as a % of offering price)

rr_MaximumCumulativeSalesChargeOverOfferingPrice

3.50%

Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds)

rr_MaximumDeferredSalesChargeOverOther

none

^[1]

Management fee

rr_ManagementFeesOverAssets

0.41%

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

rr_DistributionAndService12b1FeesOverAssets

0.50%

Other expenses

rr_OtherExpensesOverAssets

0.19%

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.01%

Total annual operating expenses

rr_ExpensesOverAssets

1.11%

^[2]

Expenses Deferred Charges [Text Block]

rr_ExpensesDeferredChargesTextBlock

Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

1 year

rr_ExpenseExampleYear01

$ 459

3 years

rr_ExpenseExampleYear03

691

5 years

rr_ExpenseExampleYear05

940

10 years

rr_ExpenseExampleYear10

1,654

1 Year

rr_ExpenseExampleNoRedemptionYear01

459

3 Years

rr_ExpenseExampleNoRedemptionYear03

691

5 Years

rr_ExpenseExampleNoRedemptionYear05

940

10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 1,654

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 20% | Fidelity Asset Manager 20%-Class C

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) on purchases (as a % of offering price)

rr_MaximumCumulativeSalesChargeOverOfferingPrice

none

Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds)

rr_MaximumDeferredSalesChargeOverOther

1.00%

^[3]

Management fee

rr_ManagementFeesOverAssets

0.41%

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

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other expenses

rr_OtherExpensesOverAssets

0.18%

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.01%

Total annual operating expenses

rr_ExpensesOverAssets

1.60%

^[2]

Expenses Deferred Charges [Text Block]

rr_ExpensesDeferredChargesTextBlock

On Class C shares redeemed less than one year after purchase.

1 year

rr_ExpenseExampleYear01

$ 263

3 years

rr_ExpenseExampleYear03

505

5 years

rr_ExpenseExampleYear05

871

10 years

rr_ExpenseExampleYear10

1,900

1 Year

rr_ExpenseExampleNoRedemptionYear01

163

3 Years

rr_ExpenseExampleNoRedemptionYear03

505

5 Years

rr_ExpenseExampleNoRedemptionYear05

871

10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 1,900

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 20% | Fidelity Asset Manager 20%-Class I

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) on purchases (as a % of offering price)

rr_MaximumCumulativeSalesChargeOverOfferingPrice

none

Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds)

rr_MaximumDeferredSalesChargeOverOther

none

Management fee

rr_ManagementFeesOverAssets

0.41%

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

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.15%

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.01%

Total annual operating expenses

rr_ExpensesOverAssets

0.57%

^[2]

1 year

rr_ExpenseExampleYear01

$ 58

3 years

rr_ExpenseExampleYear03

183

5 years

rr_ExpenseExampleYear05

318

10 years

rr_ExpenseExampleYear10

714

1 Year

rr_ExpenseExampleNoRedemptionYear01

58

3 Years

rr_ExpenseExampleNoRedemptionYear03

183

5 Years

rr_ExpenseExampleNoRedemptionYear05

318

10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 714

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 20% | Return Before Taxes | Fidelity Asset Manager 20%-Class A

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 20%

Label

rr_AverageAnnualReturnLabel

Class A - Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

(1.62%)

Past 5 years

rr_AverageAnnualReturnYear05

2.54%

Past 10 years

rr_AverageAnnualReturnYear10

2.99%

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 20% | Return Before Taxes | Fidelity Asset Manager 20%-Class M

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 20%

Label

rr_AverageAnnualReturnLabel

Class M - Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

0.49%

Past 5 years

rr_AverageAnnualReturnYear05

2.74%

Past 10 years

rr_AverageAnnualReturnYear10

2.97%

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 20% | Return Before Taxes | Fidelity Asset Manager 20%-Class C

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 20%

Label

rr_AverageAnnualReturnLabel

Class C - Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

2.55%

Past 5 years

rr_AverageAnnualReturnYear05

2.96%

Past 10 years

rr_AverageAnnualReturnYear10

2.80%

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 20% | Return Before Taxes | Fidelity Asset Manager 20%-Class I

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 20%

Label

rr_AverageAnnualReturnLabel

Class I - Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

4.68%

Past 5 years

rr_AverageAnnualReturnYear05

4.02%

Past 10 years

rr_AverageAnnualReturnYear10

3.88%

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 20% | After Taxes on Distributions | Fidelity Asset Manager 20%-Class A

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 20%

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Past 1 year

rr_AverageAnnualReturnYear01

(2.31%)

Past 5 years

rr_AverageAnnualReturnYear05

1.50%

Past 10 years

rr_AverageAnnualReturnYear10

1.94%

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 20% | After Taxes on Distributions and Sales | Fidelity Asset Manager 20%-Class A

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 20%

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Past 1 year

rr_AverageAnnualReturnYear01

(0.82%)

Past 5 years

rr_AverageAnnualReturnYear05

1.67%

Past 10 years

rr_AverageAnnualReturnYear10

1.99%

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 20% | Bloomberg Barclays U.S. Aggregate Bond Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

2.65%

Past 5 years

rr_AverageAnnualReturnYear05

2.23%

Past 10 years

rr_AverageAnnualReturnYear10

4.34%

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 20% | Fidelity Asset Manager 20% Composite Index℠(reflects no deduction for fees or expenses)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

3.54%

Past 5 years

rr_AverageAnnualReturnYear05

3.66%

Past 10 years

rr_AverageAnnualReturnYear10

3.70%

[1] Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

[2] Differs from the ratios of expenses to average net assets in the Financial Highlights section of the prospectus because of acquired fund fees and expenses.

[3] On Class C shares redeemed less than one year after purchase.

XML

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 30%

Fund Summary

Fund/Class:
Fidelity Asset Manager® 30%/Fidelity Advisor Asset Manager® 30% A, M, C, I

Investment Objective

The fund seeks a high level of current income by allocating its assets among stocks, bonds, short-term instruments and other investments. The fund also considers the potential for capital appreciation.

Fee Table

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the fund or certain other Fidelity^® funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page 50 of the prospectus. Different intermediaries may provide additional waivers or reductions of the sales charge. Please see “Sales Charge Waiver Policies Applied by Certain Intermediaries” in the “Appendix” section of the prospectus.

Shareholder fees

(fees paid directly from your investment)

Shareholder Fees {- Fidelity Asset Manager® 30%} - 09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 - Fidelity Asset Manager® 30%	Fidelity Asset Manager 30%-Class A		Fidelity Asset Manager 30%-Class M		Fidelity Asset Manager 30%-Class C		Fidelity Asset Manager 30%-Class I
Maximum sales charge (load) on purchases (as a % of offering price)	5.75%		3.50%		none		none
Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds)	none	[1]	none	[1]	1.00%	[2]	none

Annual Operating Expenses

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

Annual Operating Expenses {- Fidelity Asset Manager® 30%} - 09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 - Fidelity Asset Manager® 30%		Fidelity Asset Manager 30%-Class A	Fidelity Asset Manager 30%-Class M	Fidelity Asset Manager 30%-Class C	Fidelity Asset Manager 30%-Class I
Management fee		0.41%	0.41%	0.41%	0.41%
Distribution and/or Service (12b-1) fees		0.25%	0.50%	1.00%	none
Other expenses		0.19%	0.20%	0.20%	0.21%
Acquired fund fees and expenses		0.01%	0.01%	0.01%	0.01%
Total annual operating expenses	[1]	0.86%	1.12%	1.62%	0.63%

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

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 and if you hold your shares:

Sell All Shares

Expense Example {- Fidelity Asset Manager® 30%} - 09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 - Fidelity Asset Manager® 30% - USD ($)	Fidelity Asset Manager 30%-Class A	Fidelity Asset Manager 30%-Class M	Fidelity Asset Manager 30%-Class C	Fidelity Asset Manager 30%-Class I
1 year	$ 658	$ 460	$ 265	$ 64
3 years	834	694	511	202
5 years	1,024	945	881	351
10 years	$ 1,575	$ 1,665	$ 1,922	$ 786

Hold Shares

Expense Example, No Redemption {- Fidelity Asset Manager® 30%} - 09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 - Fidelity Asset Manager® 30% - USD ($)	Fidelity Asset Manager 30%-Class A	Fidelity Asset Manager 30%-Class M	Fidelity Asset Manager 30%-Class C	Fidelity Asset Manager 30%-Class I
1 Year	$ 658	$ 460	$ 165	$ 64
3 Years	834	694	511	202
5 Years	1,024	945	881	351
10 Years	$ 1,575	$ 1,665	$ 1,922	$ 786

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 operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 24% of the average value of its portfolio.

Principal Investment Strategies

• Allocating the fund's assets among three main asset classes: the stock class (equity securities of all types), the bond class (fixed-income securities of all types maturing in more than one year, including lower-quality debt securities which are sometimes referred to as high yield debt securities or junk bonds), and the short-term/money market class (fixed-income securities of all types maturing in one year or less).

• Maintaining a neutral mix over time of 30% of assets in stocks, 50% of assets in bonds, and 20% of assets in short-term and money market instruments.

• Adjusting allocation among asset classes gradually within the following ranges: stock class (20%-40%), bond class (40%-60%), and short-term/money market class (0%-50%).

• Investing in domestic and foreign issuers.

• Investing in Fidelity's central funds (specialized investment vehicles used by Fidelity^® funds to invest in particular security types or investment disciplines).

Principal Investment Risks

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.

• Foreign Exposure. Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile. Foreign exchange rates also can be extremely volatile.

• Prepayment. The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. 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 security to decrease. Lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds) and certain types of other securities involve greater risk of default or price changes due to changes in the credit quality of the issuer. The value of lower-quality debt securities and certain types of other securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments.

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. You could lose money by investing in the fund.

Performance

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 and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit institutional.fidelity.com for more recent performance information.

The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown.

Year-by-Year Returns

Calendar Years

During the periods shown in the chart for Class A:	Returns	Quarter ended
Highest Quarter Return	10.97%	June 30, 2009
Lowest Quarter Return	-10.67%	December 31, 2008
Year-to-Date Return	7.00%	September 30, 2017

Average Annual Returns

Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges. After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

For the periods ended December 31, 2016

Average Annual Total Returns{- Fidelity Asset Manager® 30%} - 09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 - Fidelity Asset Manager® 30%	Past 1 year	Past 5 years	Since Inception	[1]	Inception Date
Fidelity Asset Manager 30%-Class A					Oct. 09, 2007
Fidelity Asset Manager 30%-Class A | Return Before Taxes	(0.88%)	3.72%	2.97%
Fidelity Asset Manager 30%-Class A | After Taxes on Distributions	(1.50%)	2.78%	2.01%		Oct. 09, 2007
Fidelity Asset Manager 30%-Class A | After Taxes on Distributions and Sales	(0.42%)	2.62%	2.01%		Oct. 09, 2007
Fidelity Asset Manager 30%-Class M					Oct. 09, 2007
Fidelity Asset Manager 30%-Class M | Return Before Taxes	1.24%	3.94%	2.97%
Fidelity Asset Manager 30%-Class C					Oct. 09, 2007
Fidelity Asset Manager 30%-Class C | Return Before Taxes	3.45%	4.16%	2.85%
Fidelity Asset Manager 30%-Class I					Oct. 09, 2007
Fidelity Asset Manager 30%-Class I | Return Before Taxes	5.46%	5.20%	3.89%
Bloomberg Barclays U.S. Aggregate Bond Index(reflects no deduction for fees, expenses, or taxes)	2.65%	2.23%	4.29%
Fidelity Asset Manager 30% Composite Index℠(reflects no deduction for fees or expenses)	4.56%	4.89%	3.87%

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 30% | Fidelity Asset Manager 30%-Class A

Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 30% | Fidelity Asset Manager 30%-Class M

Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 30% | Fidelity Asset Manager 30%-Class C

On Class C shares redeemed less than one year after purchase.

[1] Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

[2] On Class C shares redeemed less than one year after purchase.

[1] Differs from the ratios of expenses to average net assets in the Financial Highlights section of the prospectus because of acquired fund fees and expenses.

[1] From October 9, 2007

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY CHARLES STREET TRUST

Prospectus Date

rr_ProspectusDate

Nov. 29, 2017

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 30%

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund/Class:
Fidelity Asset Manager® 30%/Fidelity Advisor Asset Manager® 30% A, M, C, I

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks a high level of current income by allocating its assets among stocks, bonds, short-term instruments and other investments. The fund also considers the potential for capital appreciation.

Expense [Heading]

rr_ExpenseHeading

Fee Table

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the fund or certain other Fidelity^® funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page 50 of the prospectus. Different intermediaries may provide additional waivers or reductions of the sales charge. Please see “Sales Charge Waiver Policies Applied by Certain Intermediaries” in the “Appendix” section of the prospectus.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder fees

(fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Operating Expenses

(expenses that you pay each year as a % 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 operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 24% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

24.00%

Expense Breakpoint Discounts [Text]

rr_ExpenseBreakpointDiscounts

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the fund or certain other Fidelity® funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page 50 of the prospectus.

Expense Breakpoint, Minimum Investment Required [Amount]

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

$ 50,000

Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text]

rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees

Differs from the ratios of expenses to average net assets in the Financial Highlights section of the prospectus because of acquired fund fees and expenses.

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

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 and if you hold your shares:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Sell All Shares

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

rr_ExpenseExampleNoRedemptionByYearCaption

Hold Shares

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

• Allocating the fund's assets among three main asset classes: the stock class (equity securities of all types), the bond class (fixed-income securities of all types maturing in more than one year, including lower-quality debt securities which are sometimes referred to as high yield debt securities or junk bonds), and the short-term/money market class (fixed-income securities of all types maturing in one year or less).

• Maintaining a neutral mix over time of 30% of assets in stocks, 50% of assets in bonds, and 20% of assets in short-term and money market instruments.

• Adjusting allocation among asset classes gradually within the following ranges: stock class (20%-40%), bond class (40%-60%), and short-term/money market class (0%-50%).

• Investing in domestic and foreign issuers.

• Investing in Fidelity's central funds (specialized investment vehicles used by Fidelity^® funds to invest in particular security types or investment disciplines).

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.

• Foreign Exposure. Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile. Foreign exchange rates also can be extremely volatile.

• Prepayment. The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. 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 security to decrease. Lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds) and certain types of other securities involve greater risk of default or price changes due to changes in the credit quality of the issuer. The value of lower-quality debt securities and certain types of other securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments.

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. You could lose money by investing in the fund.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could 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 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 and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit institutional.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

institutional.fidelity.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

rr_BarChartHeading

Year-by-Year Returns

Calendar Years

Bar Chart Narrative [Text Block]

rr_BarChartNarrativeTextBlock

The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown.

Bar Chart Does Not Reflect Sales Loads [Text]

rr_BarChartDoesNotReflectSalesLoads

The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown.

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the periods shown in the chart for Class A:	Returns	Quarter ended
Highest Quarter Return	10.97%	June 30, 2009
Lowest Quarter Return	-10.67%	December 31, 2008
Year-to-Date Return	7.00%	September 30, 2017

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Returns

Performance Table Does Reflect Sales Loads

rr_PerformanceTableDoesReflectSalesLoads

Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges.

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

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

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table One Class of after Tax Shown [Text]

rr_PerformanceTableOneClassOfAfterTaxShown

After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary.

Performance Table Explanation after Tax Higher

rr_PerformanceTableExplanationAfterTaxHigher

Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges. After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

For the periods ended December 31, 2016

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 30% | Fidelity Asset Manager 30%-Class A

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) on purchases (as a % of offering price)

rr_MaximumCumulativeSalesChargeOverOfferingPrice

5.75%

Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds)

rr_MaximumDeferredSalesChargeOverOther

none

^[1]

Management fee

rr_ManagementFeesOverAssets

0.41%

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

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other expenses

rr_OtherExpensesOverAssets

0.19%

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.01%

Total annual operating expenses

rr_ExpensesOverAssets

0.86%

^[2]

Expenses Deferred Charges [Text Block]

rr_ExpensesDeferredChargesTextBlock

Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

1 year

rr_ExpenseExampleYear01

$ 658

3 years

rr_ExpenseExampleYear03

834

5 years

rr_ExpenseExampleYear05

1,024

10 years

rr_ExpenseExampleYear10

1,575

1 Year

rr_ExpenseExampleNoRedemptionYear01

658

3 Years

rr_ExpenseExampleNoRedemptionYear03

834

5 Years

rr_ExpenseExampleNoRedemptionYear05

1,024

10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 1,575

2008

rr_AnnualReturn2008

(19.88%)

2009

rr_AnnualReturn2009

23.20%

2010

rr_AnnualReturn2010

10.62%

2011

rr_AnnualReturn2011

1.48%

2012

rr_AnnualReturn2012

8.24%

2013

rr_AnnualReturn2013

7.72%

2014

rr_AnnualReturn2014

4.47%

2015

rr_AnnualReturn2015

(0.60%)

2016

rr_AnnualReturn2016

5.17%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Sep. 30, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

7.00%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

10.97%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(10.67%)

Inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 09, 2007

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 30% | Fidelity Asset Manager 30%-Class M

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) on purchases (as a % of offering price)

rr_MaximumCumulativeSalesChargeOverOfferingPrice

3.50%

Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds)

rr_MaximumDeferredSalesChargeOverOther

none

^[1]

Management fee

rr_ManagementFeesOverAssets

0.41%

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

rr_DistributionAndService12b1FeesOverAssets

0.50%

Other expenses

rr_OtherExpensesOverAssets

0.20%

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.01%

Total annual operating expenses

rr_ExpensesOverAssets

1.12%

^[2]

Expenses Deferred Charges [Text Block]

rr_ExpensesDeferredChargesTextBlock

Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

1 year

rr_ExpenseExampleYear01

$ 460

3 years

rr_ExpenseExampleYear03

694

5 years

rr_ExpenseExampleYear05

945

10 years

rr_ExpenseExampleYear10

1,665

1 Year

rr_ExpenseExampleNoRedemptionYear01

460

3 Years

rr_ExpenseExampleNoRedemptionYear03

694

5 Years

rr_ExpenseExampleNoRedemptionYear05

945

10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 1,665

Inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 09, 2007

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 30% | Fidelity Asset Manager 30%-Class C

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) on purchases (as a % of offering price)

rr_MaximumCumulativeSalesChargeOverOfferingPrice

none

Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds)

rr_MaximumDeferredSalesChargeOverOther

1.00%

^[3]

Management fee

rr_ManagementFeesOverAssets

0.41%

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

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other expenses

rr_OtherExpensesOverAssets

0.20%

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.01%

Total annual operating expenses

rr_ExpensesOverAssets

1.62%

^[2]

Expenses Deferred Charges [Text Block]

rr_ExpensesDeferredChargesTextBlock

On Class C shares redeemed less than one year after purchase.

1 year

rr_ExpenseExampleYear01

$ 265

3 years

rr_ExpenseExampleYear03

511

5 years

rr_ExpenseExampleYear05

881

10 years

rr_ExpenseExampleYear10

1,922

1 Year

rr_ExpenseExampleNoRedemptionYear01

165

3 Years

rr_ExpenseExampleNoRedemptionYear03

511

5 Years

rr_ExpenseExampleNoRedemptionYear05

881

10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 1,922

Inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 09, 2007

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 30% | Fidelity Asset Manager 30%-Class I

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) on purchases (as a % of offering price)

rr_MaximumCumulativeSalesChargeOverOfferingPrice

none

Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds)

rr_MaximumDeferredSalesChargeOverOther

none

Management fee

rr_ManagementFeesOverAssets

0.41%

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

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.21%

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.01%

Total annual operating expenses

rr_ExpensesOverAssets

0.63%

^[2]

1 year

rr_ExpenseExampleYear01

$ 64

3 years

rr_ExpenseExampleYear03

202

5 years

rr_ExpenseExampleYear05

351

10 years

rr_ExpenseExampleYear10

786

1 Year

rr_ExpenseExampleNoRedemptionYear01

64

3 Years

rr_ExpenseExampleNoRedemptionYear03

202

5 Years

rr_ExpenseExampleNoRedemptionYear05

351

10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 786

Inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 09, 2007

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 30% | Return Before Taxes | Fidelity Asset Manager 30%-Class A

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 30%

Label

rr_AverageAnnualReturnLabel

Class A - Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

(0.88%)

Past 5 years

rr_AverageAnnualReturnYear05

3.72%

Since Inception

rr_AverageAnnualReturnSinceInception

2.97%

^[4]

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 30% | Return Before Taxes | Fidelity Asset Manager 30%-Class M

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 30%

Label

rr_AverageAnnualReturnLabel

Class M - Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

1.24%

Past 5 years

rr_AverageAnnualReturnYear05

3.94%

Since Inception

rr_AverageAnnualReturnSinceInception

2.97%

^[4]

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 30% | Return Before Taxes | Fidelity Asset Manager 30%-Class C

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 30%

Label

rr_AverageAnnualReturnLabel

Class C - Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

3.45%

Past 5 years

rr_AverageAnnualReturnYear05

4.16%

Since Inception

rr_AverageAnnualReturnSinceInception

2.85%

^[4]

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 30% | Return Before Taxes | Fidelity Asset Manager 30%-Class I

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 30%

Label

rr_AverageAnnualReturnLabel

Class I - Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

5.46%

Past 5 years

rr_AverageAnnualReturnYear05

5.20%

Since Inception

rr_AverageAnnualReturnSinceInception

3.89%

^[4]

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 30% | After Taxes on Distributions | Fidelity Asset Manager 30%-Class A

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 30%

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Past 1 year

rr_AverageAnnualReturnYear01

(1.50%)

Past 5 years

rr_AverageAnnualReturnYear05

2.78%

Since Inception

rr_AverageAnnualReturnSinceInception

2.01%

^[4]

Inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 09, 2007

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 30% | After Taxes on Distributions and Sales | Fidelity Asset Manager 30%-Class A

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 30%

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Past 1 year

rr_AverageAnnualReturnYear01

(0.42%)

Past 5 years

rr_AverageAnnualReturnYear05

2.62%

Since Inception

rr_AverageAnnualReturnSinceInception

2.01%

^[4]

Inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 09, 2007

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 30% | Bloomberg Barclays U.S. Aggregate Bond Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

2.65%

Past 5 years

rr_AverageAnnualReturnYear05

2.23%

Since Inception

rr_AverageAnnualReturnSinceInception

4.29%

^[4]

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 30% | Fidelity Asset Manager 30% Composite Index℠(reflects no deduction for fees or expenses)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

4.56%

Past 5 years

rr_AverageAnnualReturnYear05

4.89%

Since Inception

rr_AverageAnnualReturnSinceInception

3.87%

^[4]

[1] Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

[2] Differs from the ratios of expenses to average net assets in the Financial Highlights section of the prospectus because of acquired fund fees and expenses.

[3] On Class C shares redeemed less than one year after purchase.

[4] From October 9, 2007

XML

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 40%

Fund Summary

Fund/Class:
Fidelity Asset Manager® 40%/Fidelity Advisor Asset Manager® 40% A, M, C, I

Investment Objective

The fund seeks current income as well as total return with reduced risk over the long term by allocating its assets among stocks, bonds, and short-term instruments. The fund also considers the potential for capital appreciation.

Fee Table

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the fund or certain other Fidelity^® funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page 50 of the prospectus. Different intermediaries may provide additional waivers or reductions of the sales charge. Please see “Sales Charge Waiver Policies Applied by Certain Intermediaries” in the “Appendix” section of the prospectus.

Shareholder fees

(fees paid directly from your investment)

Shareholder Fees {- Fidelity Asset Manager® 40%} - 09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 - Fidelity Asset Manager® 40%	Fidelity Asset Manager 40%-Class A		Fidelity Asset Manager 40%-Class M		Fidelity Asset Manager 40%-Class C		Fidelity Asset Manager 40%-Class I
Maximum sales charge (load) on purchases (as a % of offering price)	5.75%		3.50%		none		none
Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds)	none	[1]	none	[1]	1.00%	[2]	none

Annual Operating Expenses

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

Annual Operating Expenses {- Fidelity Asset Manager® 40%} - 09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 - Fidelity Asset Manager® 40%		Fidelity Asset Manager 40%-Class A	Fidelity Asset Manager 40%-Class M	Fidelity Asset Manager 40%-Class C	Fidelity Asset Manager 40%-Class I
Management fee		0.41%	0.41%	0.41%	0.41%
Distribution and/or Service (12b-1) fees		0.25%	0.50%	1.00%	none
Other expenses		0.18%	0.21%	0.20%	0.15%
Acquired fund fees and expenses		0.02%	0.02%	0.02%	0.02%
Total annual operating expenses	[1]	0.86%	1.14%	1.63%	0.58%

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

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 and if you hold your shares:

Sell All Shares

Expense Example {- Fidelity Asset Manager® 40%} - 09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 - Fidelity Asset Manager® 40% - USD ($)	Fidelity Asset Manager 40%-Class A	Fidelity Asset Manager 40%-Class M	Fidelity Asset Manager 40%-Class C	Fidelity Asset Manager 40%-Class I
1 year	$ 658	$ 462	$ 266	$ 59
3 years	834	700	514	186
5 years	1,024	956	887	324
10 years	$ 1,575	$ 1,688	$ 1,933	$ 726

Hold Shares

Expense Example, No Redemption {- Fidelity Asset Manager® 40%} - 09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 - Fidelity Asset Manager® 40% - USD ($)	Fidelity Asset Manager 40%-Class A	Fidelity Asset Manager 40%-Class M	Fidelity Asset Manager 40%-Class C	Fidelity Asset Manager 40%-Class I
1 Year	$ 658	$ 462	$ 166	$ 59
3 Years	834	700	514	186
5 Years	1,024	956	887	324
10 Years	$ 1,575	$ 1,688	$ 1,933	$ 726

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 operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 20% of the average value of its portfolio.

Principal Investment Strategies

• Allocating the fund's assets among three main asset classes: the stock class (equity securities of all types), the bond class (fixed-income securities of all types maturing in more than one year, including lower-quality debt securities which are sometimes referred to as high yield debt securities or junk bonds), and the short-term/money market class (fixed-income securities of all types maturing in one year or less).

• Maintaining a neutral mix over time of 40% of assets in stocks, 45% of assets in bonds, and 15% of assets in short-term and money market instruments.

• Adjusting allocation among asset classes gradually within the following ranges: stock class (20%-60%), bond class (30%-60%), and short-term/money market class (0%-50%).

• Investing in domestic and foreign issuers.

• Investing in Fidelity's central funds (specialized investment vehicles used by Fidelity^® funds to invest in particular security types or investment disciplines).

Principal Investment Risks

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.

• Foreign Exposure. Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile. Foreign exchange rates also can be extremely volatile.

• Prepayment. The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. Lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds) and certain types of other securities involve greater risk of default or price changes due to changes in the credit quality of the issuer. The value of lower-quality debt securities and certain types of other securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments.

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. You could lose money by investing in the fund.

Performance

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 and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit institutional.fidelity.com for more recent performance information.

The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown.

Year-by-Year Returns

Calendar Years

During the periods shown in the chart for Class A:	Returns	Quarter ended
Highest Quarter Return	12.78%	June 30, 2009
Lowest Quarter Return	-12.40%	December 31, 2008
Year-to-Date Return	8.61%	September 30, 2017

Average Annual Returns

Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges. After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

For the periods ended December 31, 2016

Average Annual Total Returns{- Fidelity Asset Manager® 40%} - 09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 - Fidelity Asset Manager® 40%	Past 1 year	Past 5 years	Since Inception	[1]	Inception Date
Fidelity Asset Manager 40%-Class A					Oct. 09, 2007
Fidelity Asset Manager 40%-Class A | Return Before Taxes	(0.30%)	4.78%	3.17%
Fidelity Asset Manager 40%-Class A | After Taxes on Distributions	(0.87%)	3.87%	2.29%		Oct. 09, 2007
Fidelity Asset Manager 40%-Class A | After Taxes on Distributions and Sales	(0.07%)	3.48%	2.21%		Oct. 09, 2007
Fidelity Asset Manager 40%-Class M					Oct. 09, 2007
Fidelity Asset Manager 40%-Class M | Return Before Taxes	1.78%	5.00%	3.16%
Fidelity Asset Manager 40%-Class C					Oct. 09, 2007
Fidelity Asset Manager 40%-Class C | Return Before Taxes	3.89%	5.21%	3.04%
Fidelity Asset Manager 40%-Class I					Oct. 09, 2007
Fidelity Asset Manager 40%-Class I | Return Before Taxes	5.96%	6.30%	4.09%
Bloomberg Barclays U.S. Aggregate Bond Index(reflects no deduction for fees, expenses, or taxes)	2.65%	2.23%	4.29%
Fidelity Asset Manager 40% Composite Index℠(reflects no deduction for fees or expenses)	5.45%	6.02%	4.13%

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 40% | Fidelity Asset Manager 40%-Class A

Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 40% | Fidelity Asset Manager 40%-Class M

Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 40% | Fidelity Asset Manager 40%-Class C

On Class C shares redeemed less than one year after purchase.

[1] Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

[2] On Class C shares redeemed less than one year after purchase.

[1] Differs from the ratios of expenses to average net assets in the Financial Highlights section of the prospectus because of acquired fund fees and expenses.

[1] From October 9, 2007

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY CHARLES STREET TRUST

Prospectus Date

rr_ProspectusDate

Nov. 29, 2017

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 40%

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund/Class:
Fidelity Asset Manager® 40%/Fidelity Advisor Asset Manager® 40% A, M, C, I

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks current income as well as total return with reduced risk over the long term by allocating its assets among stocks, bonds, and short-term instruments. The fund also considers the potential for capital appreciation.

Expense [Heading]

rr_ExpenseHeading

Fee Table

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the fund or certain other Fidelity^® funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page 50 of the prospectus. Different intermediaries may provide additional waivers or reductions of the sales charge. Please see “Sales Charge Waiver Policies Applied by Certain Intermediaries” in the “Appendix” section of the prospectus.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder fees

(fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Operating Expenses

(expenses that you pay each year as a % 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 operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 20% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

20.00%

Expense Breakpoint Discounts [Text]

rr_ExpenseBreakpointDiscounts

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the fund or certain other Fidelity® funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page 50 of the prospectus.

Expense Breakpoint, Minimum Investment Required [Amount]

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

$ 50,000

Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text]

rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees

Differs from the ratios of expenses to average net assets in the Financial Highlights section of the prospectus because of acquired fund fees and expenses.

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

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 and if you hold your shares:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Sell All Shares

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

rr_ExpenseExampleNoRedemptionByYearCaption

Hold Shares

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

• Allocating the fund's assets among three main asset classes: the stock class (equity securities of all types), the bond class (fixed-income securities of all types maturing in more than one year, including lower-quality debt securities which are sometimes referred to as high yield debt securities or junk bonds), and the short-term/money market class (fixed-income securities of all types maturing in one year or less).

• Maintaining a neutral mix over time of 40% of assets in stocks, 45% of assets in bonds, and 15% of assets in short-term and money market instruments.

• Adjusting allocation among asset classes gradually within the following ranges: stock class (20%-60%), bond class (30%-60%), and short-term/money market class (0%-50%).

• Investing in domestic and foreign issuers.

• Investing in Fidelity's central funds (specialized investment vehicles used by Fidelity^® funds to invest in particular security types or investment disciplines).

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.

• Foreign Exposure. Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile. Foreign exchange rates also can be extremely volatile.

• Prepayment. The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. Lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds) and certain types of other securities involve greater risk of default or price changes due to changes in the credit quality of the issuer. The value of lower-quality debt securities and certain types of other securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments.

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. You could lose money by investing in the fund.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could 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 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 and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit institutional.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

institutional.fidelity.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

rr_BarChartHeading

Year-by-Year Returns

Calendar Years

Bar Chart Narrative [Text Block]

rr_BarChartNarrativeTextBlock

The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown.

Bar Chart Does Not Reflect Sales Loads [Text]

rr_BarChartDoesNotReflectSalesLoads

The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown.

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the periods shown in the chart for Class A:	Returns	Quarter ended
Highest Quarter Return	12.78%	June 30, 2009
Lowest Quarter Return	-12.40%	December 31, 2008
Year-to-Date Return	8.61%	September 30, 2017

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Returns

Performance Table Does Reflect Sales Loads

rr_PerformanceTableDoesReflectSalesLoads

Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges.

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

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

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table One Class of after Tax Shown [Text]

rr_PerformanceTableOneClassOfAfterTaxShown

After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary.

Performance Table Explanation after Tax Higher

rr_PerformanceTableExplanationAfterTaxHigher

Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges. After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

For the periods ended December 31, 2016

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 40% | Fidelity Asset Manager 40%-Class A

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) on purchases (as a % of offering price)

rr_MaximumCumulativeSalesChargeOverOfferingPrice

5.75%

Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds)

rr_MaximumDeferredSalesChargeOverOther

none

^[1]

Management fee

rr_ManagementFeesOverAssets

0.41%

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

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other expenses

rr_OtherExpensesOverAssets

0.18%

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.02%

Total annual operating expenses

rr_ExpensesOverAssets

0.86%

^[2]

Expenses Deferred Charges [Text Block]

rr_ExpensesDeferredChargesTextBlock

Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

1 year

rr_ExpenseExampleYear01

$ 658

3 years

rr_ExpenseExampleYear03

834

5 years

rr_ExpenseExampleYear05

1,024

10 years

rr_ExpenseExampleYear10

1,575

1 Year

rr_ExpenseExampleNoRedemptionYear01

658

3 Years

rr_ExpenseExampleNoRedemptionYear03

834

5 Years

rr_ExpenseExampleNoRedemptionYear05

1,024

10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 1,575

2008

rr_AnnualReturn2008

(23.37%)

2009

rr_AnnualReturn2009

25.56%

2010

rr_AnnualReturn2010

11.92%

2011

rr_AnnualReturn2011

0.24%

2012

rr_AnnualReturn2012

9.88%

2013

rr_AnnualReturn2013

10.65%

2014

rr_AnnualReturn2014

4.93%

2015

rr_AnnualReturn2015

(0.67%)

2016

rr_AnnualReturn2016

5.78%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Sep. 30, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

8.61%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

12.78%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(12.40%)

Inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 09, 2007

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 40% | Fidelity Asset Manager 40%-Class M

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) on purchases (as a % of offering price)

rr_MaximumCumulativeSalesChargeOverOfferingPrice

3.50%

Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds)

rr_MaximumDeferredSalesChargeOverOther

none

^[1]

Management fee

rr_ManagementFeesOverAssets

0.41%

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

rr_DistributionAndService12b1FeesOverAssets

0.50%

Other expenses

rr_OtherExpensesOverAssets

0.21%

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.02%

Total annual operating expenses

rr_ExpensesOverAssets

1.14%

^[2]

Expenses Deferred Charges [Text Block]

rr_ExpensesDeferredChargesTextBlock

Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

1 year

rr_ExpenseExampleYear01

$ 462

3 years

rr_ExpenseExampleYear03

700

5 years

rr_ExpenseExampleYear05

956

10 years

rr_ExpenseExampleYear10

1,688

1 Year

rr_ExpenseExampleNoRedemptionYear01

462

3 Years

rr_ExpenseExampleNoRedemptionYear03

700

5 Years

rr_ExpenseExampleNoRedemptionYear05

956

10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 1,688

Inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 09, 2007

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 40% | Fidelity Asset Manager 40%-Class C

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) on purchases (as a % of offering price)

rr_MaximumCumulativeSalesChargeOverOfferingPrice

none

Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds)

rr_MaximumDeferredSalesChargeOverOther

1.00%

^[3]

Management fee

rr_ManagementFeesOverAssets

0.41%

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

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other expenses

rr_OtherExpensesOverAssets

0.20%

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.02%

Total annual operating expenses

rr_ExpensesOverAssets

1.63%

^[2]

Expenses Deferred Charges [Text Block]

rr_ExpensesDeferredChargesTextBlock

On Class C shares redeemed less than one year after purchase.

1 year

rr_ExpenseExampleYear01

$ 266

3 years

rr_ExpenseExampleYear03

514

5 years

rr_ExpenseExampleYear05

887

10 years

rr_ExpenseExampleYear10

1,933

1 Year

rr_ExpenseExampleNoRedemptionYear01

166

3 Years

rr_ExpenseExampleNoRedemptionYear03

514

5 Years

rr_ExpenseExampleNoRedemptionYear05

887

10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 1,933

Inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 09, 2007

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 40% | Fidelity Asset Manager 40%-Class I

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) on purchases (as a % of offering price)

rr_MaximumCumulativeSalesChargeOverOfferingPrice

none

Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds)

rr_MaximumDeferredSalesChargeOverOther

none

Management fee

rr_ManagementFeesOverAssets

0.41%

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

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.15%

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.02%

Total annual operating expenses

rr_ExpensesOverAssets

0.58%

^[2]

1 year

rr_ExpenseExampleYear01

$ 59

3 years

rr_ExpenseExampleYear03

186

5 years

rr_ExpenseExampleYear05

324

10 years

rr_ExpenseExampleYear10

726

1 Year

rr_ExpenseExampleNoRedemptionYear01

59

3 Years

rr_ExpenseExampleNoRedemptionYear03

186

5 Years

rr_ExpenseExampleNoRedemptionYear05

324

10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 726

Inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 09, 2007

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 40% | Return Before Taxes | Fidelity Asset Manager 40%-Class A

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 40%

Label

rr_AverageAnnualReturnLabel

Class A - Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

(0.30%)

Past 5 years

rr_AverageAnnualReturnYear05

4.78%

Since Inception

rr_AverageAnnualReturnSinceInception

3.17%

^[4]

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 40% | Return Before Taxes | Fidelity Asset Manager 40%-Class M

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 40%

Label

rr_AverageAnnualReturnLabel

Class M - Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

1.78%

Past 5 years

rr_AverageAnnualReturnYear05

5.00%

Since Inception

rr_AverageAnnualReturnSinceInception

3.16%

^[4]

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 40% | Return Before Taxes | Fidelity Asset Manager 40%-Class C

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 40%

Label

rr_AverageAnnualReturnLabel

Class C - Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

3.89%

Past 5 years

rr_AverageAnnualReturnYear05

5.21%

Since Inception

rr_AverageAnnualReturnSinceInception

3.04%

^[4]

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 40% | Return Before Taxes | Fidelity Asset Manager 40%-Class I

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 40%

Label

rr_AverageAnnualReturnLabel

Class I - Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

5.96%

Past 5 years

rr_AverageAnnualReturnYear05

6.30%

Since Inception

rr_AverageAnnualReturnSinceInception

4.09%

^[4]

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 40% | After Taxes on Distributions | Fidelity Asset Manager 40%-Class A

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 40%

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Past 1 year

rr_AverageAnnualReturnYear01

(0.87%)

Past 5 years

rr_AverageAnnualReturnYear05

3.87%

Since Inception

rr_AverageAnnualReturnSinceInception

2.29%

^[4]

Inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 09, 2007

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 40% | After Taxes on Distributions and Sales | Fidelity Asset Manager 40%-Class A

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 40%

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Past 1 year

rr_AverageAnnualReturnYear01

(0.07%)

Past 5 years

rr_AverageAnnualReturnYear05

3.48%

Since Inception

rr_AverageAnnualReturnSinceInception

2.21%

^[4]

Inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 09, 2007

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 40% | Bloomberg Barclays U.S. Aggregate Bond Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

2.65%

Past 5 years

rr_AverageAnnualReturnYear05

2.23%

Since Inception

rr_AverageAnnualReturnSinceInception

4.29%

^[4]

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 40% | Fidelity Asset Manager 40% Composite Index℠(reflects no deduction for fees or expenses)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

5.45%

Past 5 years

rr_AverageAnnualReturnYear05

6.02%

Since Inception

rr_AverageAnnualReturnSinceInception

4.13%

^[4]

[1] Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

[2] Differs from the ratios of expenses to average net assets in the Financial Highlights section of the prospectus because of acquired fund fees and expenses.

[3] On Class C shares redeemed less than one year after purchase.

[4] From October 9, 2007

XML

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 50%

Fund Summary

Fund/Class:
Fidelity Asset Manager® 50%/Fidelity Advisor Asset Manager® 50% A, M, C, I

Investment Objective

The fund seeks high total return with reduced risk over the long term by allocating its assets among stocks, bonds, and short-term instruments.

Fee Table

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the fund or certain other Fidelity^® funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page 50 of the prospectus. Different intermediaries may provide additional waivers or reductions of the sales charge. Please see “Sales Charge Waiver Policies Applied by Certain Intermediaries” in the “Appendix” section of the prospectus.

Shareholder fees

(fees paid directly from your investment)

Shareholder Fees {- Fidelity Asset Manager® 50%} - 09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 - Fidelity Asset Manager® 50%	Fidelity Asset Manager 50%-Class A		Fidelity Asset Manager 50%-Class M		Fidelity Asset Manager 50%-Class C		Fidelity Asset Manager 50%-Class I
Maximum sales charge (load) on purchases (as a % of offering price)	5.75%		3.50%		none		none
Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds)	none	[1]	none	[1]	1.00%	[2]	none

Annual Operating Expenses

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

Annual Operating Expenses {- Fidelity Asset Manager® 50%} - 09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 - Fidelity Asset Manager® 50%		Fidelity Asset Manager 50%-Class A	Fidelity Asset Manager 50%-Class M	Fidelity Asset Manager 50%-Class C	Fidelity Asset Manager 50%-Class I
Management fee		0.50%	0.50%	0.50%	0.50%
Distribution and/or Service (12b-1) fees		0.25%	0.50%	1.00%	none
Other expenses		0.21%	0.21%	0.22%	0.18%
Acquired fund fees and expenses		0.02%	0.02%	0.02%	0.02%
Total annual operating expenses	[1]	0.98%	1.23%	1.74%	0.70%

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

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 and if you hold your shares:

Sell All Shares

Expense Example {- Fidelity Asset Manager® 50%} - 09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 - Fidelity Asset Manager® 50% - USD ($)	Fidelity Asset Manager 50%-Class A	Fidelity Asset Manager 50%-Class M	Fidelity Asset Manager 50%-Class C	Fidelity Asset Manager 50%-Class I
1 year	$ 669	$ 471	$ 277	$ 72
3 years	869	727	548	224
5 years	1,086	1,002	944	390
10 years	$ 1,707	$ 1,787	$ 2,052	$ 871

Hold Shares

Expense Example, No Redemption {- Fidelity Asset Manager® 50%} - 09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 - Fidelity Asset Manager® 50% - USD ($)	Fidelity Asset Manager 50%-Class A	Fidelity Asset Manager 50%-Class M	Fidelity Asset Manager 50%-Class C	Fidelity Asset Manager 50%-Class I
1 Year	$ 669	$ 471	$ 177	$ 72
3 Years	869	727	548	224
5 Years	1,086	1,002	944	390
10 Years	$ 1,707	$ 1,787	$ 2,052	$ 871

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 operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 20% of the average value of its portfolio.

Principal Investment Strategies

• Allocating the fund's assets among three main asset classes: the stock class (equity securities of all types), the bond class (fixed-income securities of all types maturing in more than one year, including lower-quality debt securities which are sometimes referred to as high yield debt securities or junk bonds), and the short-term/money market class (fixed-income securities of all types maturing in one year or less).

• Maintaining a neutral mix over time of 50% of assets in stocks, 40% of assets in bonds, and 10% of assets in short-term and money market instruments.

• Adjusting allocation among asset classes gradually within the following ranges: stock class (30%-70%), bond class (20%-60%), and short-term/money market class (0%-50%).

• Investing in domestic and foreign issuers.

• Investing in Fidelity's central funds (specialized investment vehicles used by Fidelity^® funds to invest in particular security types or investment disciplines).

Principal Investment Risks

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.

• Foreign Exposure. Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile. Foreign exchange rates also can be extremely volatile.

• Prepayment. The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. Lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds) and certain types of other securities involve greater risk of default or price changes due to changes in the credit quality of the issuer. The value of lower-quality debt securities and certain types of other securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments.

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. You could lose money by investing in the fund.

Performance

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 and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit institutional.fidelity.com for more recent performance information.

The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown.

Year-by-Year Returns

Calendar Years

During the periods shown in the chart for Class A:	Returns	Quarter ended
Highest Quarter Return	15.11%	June 30, 2009
Lowest Quarter Return	-14.80%	December 31, 2008
Year-to-Date Return	10.32%	September 30, 2017

Average Annual Returns

Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges. After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

For the periods ended December 31, 2016

Average Annual Total Returns{- Fidelity Asset Manager® 50%} - 09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 - Fidelity Asset Manager® 50%	Past 1 year	Past 5 years	Past 10 years
Fidelity Asset Manager 50%-Class A | Return Before Taxes	(0.03%)	5.65%	3.93%
Fidelity Asset Manager 50%-Class A | After Taxes on Distributions	(0.61%)	4.29%	2.73%
Fidelity Asset Manager 50%-Class A | After Taxes on Distributions and Sales	0.17%	4.10%	2.74%
Fidelity Asset Manager 50%-Class M | Return Before Taxes	2.09%	5.90%	3.92%
Fidelity Asset Manager 50%-Class C | Return Before Taxes	4.30%	6.11%	3.76%
Fidelity Asset Manager 50%-Class I | Return Before Taxes	6.32%	7.19%	4.84%
S&P 500® Index(reflects no deduction for fees, expenses, or taxes)	11.96%	14.66%	6.95%
Fidelity Asset Manager 50% Composite Index℠(reflects no deduction for fees or expenses)	6.33%	7.14%	4.83%

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 50% | Fidelity Asset Manager 50%-Class A

Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 50% | Fidelity Asset Manager 50%-Class M

Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 50% | Fidelity Asset Manager 50%-Class C

On Class C shares redeemed less than one year after purchase.

[1] Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

[2] On Class C shares redeemed less than one year after purchase.

[1] Differs from the ratios of expenses to average net assets in the Financial Highlights section of the prospectus because of acquired fund fees and expenses.

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY CHARLES STREET TRUST

Prospectus Date

rr_ProspectusDate

Nov. 29, 2017

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 50%

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund/Class:
Fidelity Asset Manager® 50%/Fidelity Advisor Asset Manager® 50% A, M, C, I

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks high total return with reduced risk over the long term by allocating its assets among stocks, bonds, and short-term instruments.

Expense [Heading]

rr_ExpenseHeading

Fee Table

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the fund or certain other Fidelity^® funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page 50 of the prospectus. Different intermediaries may provide additional waivers or reductions of the sales charge. Please see “Sales Charge Waiver Policies Applied by Certain Intermediaries” in the “Appendix” section of the prospectus.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder fees

(fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Operating Expenses

(expenses that you pay each year as a % 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 operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 20% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

20.00%

Expense Breakpoint Discounts [Text]

rr_ExpenseBreakpointDiscounts

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the fund or certain other Fidelity® funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page 50 of the prospectus.

Expense Breakpoint, Minimum Investment Required [Amount]

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

$ 50,000

Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text]

rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees

Differs from the ratios of expenses to average net assets in the Financial Highlights section of the prospectus because of acquired fund fees and expenses.

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

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 and if you hold your shares:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Sell All Shares

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

rr_ExpenseExampleNoRedemptionByYearCaption

Hold Shares

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

• Allocating the fund's assets among three main asset classes: the stock class (equity securities of all types), the bond class (fixed-income securities of all types maturing in more than one year, including lower-quality debt securities which are sometimes referred to as high yield debt securities or junk bonds), and the short-term/money market class (fixed-income securities of all types maturing in one year or less).

• Maintaining a neutral mix over time of 50% of assets in stocks, 40% of assets in bonds, and 10% of assets in short-term and money market instruments.

• Adjusting allocation among asset classes gradually within the following ranges: stock class (30%-70%), bond class (20%-60%), and short-term/money market class (0%-50%).

• Investing in domestic and foreign issuers.

• Investing in Fidelity's central funds (specialized investment vehicles used by Fidelity^® funds to invest in particular security types or investment disciplines).

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.

• Foreign Exposure. Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile. Foreign exchange rates also can be extremely volatile.

• Prepayment. The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. Lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds) and certain types of other securities involve greater risk of default or price changes due to changes in the credit quality of the issuer. The value of lower-quality debt securities and certain types of other securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments.

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. You could lose money by investing in the fund.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could 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 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 and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit institutional.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

institutional.fidelity.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

rr_BarChartHeading

Year-by-Year Returns

Calendar Years

Bar Chart Narrative [Text Block]

rr_BarChartNarrativeTextBlock

The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown.

Bar Chart Does Not Reflect Sales Loads [Text]

rr_BarChartDoesNotReflectSalesLoads

The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown.

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the periods shown in the chart for Class A:	Returns	Quarter ended
Highest Quarter Return	15.11%	June 30, 2009
Lowest Quarter Return	-14.80%	December 31, 2008
Year-to-Date Return	10.32%	September 30, 2017

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Returns

Performance Table Does Reflect Sales Loads

rr_PerformanceTableDoesReflectSalesLoads

Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges.

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

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

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table One Class of after Tax Shown [Text]

rr_PerformanceTableOneClassOfAfterTaxShown

After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary.

Performance Table Explanation after Tax Higher

rr_PerformanceTableExplanationAfterTaxHigher

Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges. After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

For the periods ended December 31, 2016

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 50% | Fidelity Asset Manager 50%-Class A

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) on purchases (as a % of offering price)

rr_MaximumCumulativeSalesChargeOverOfferingPrice

5.75%

Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds)

rr_MaximumDeferredSalesChargeOverOther

none

^[1]

Management fee

rr_ManagementFeesOverAssets

0.50%

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

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other expenses

rr_OtherExpensesOverAssets

0.21%

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.02%

Total annual operating expenses

rr_ExpensesOverAssets

0.98%

^[2]

Expenses Deferred Charges [Text Block]

rr_ExpensesDeferredChargesTextBlock

Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

1 year

rr_ExpenseExampleYear01

$ 669

3 years

rr_ExpenseExampleYear03

869

5 years

rr_ExpenseExampleYear05

1,086

10 years

rr_ExpenseExampleYear10

1,707

1 Year

rr_ExpenseExampleNoRedemptionYear01

669

3 Years

rr_ExpenseExampleNoRedemptionYear03

869

5 Years

rr_ExpenseExampleNoRedemptionYear05

1,086

10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 1,707

2007

rr_AnnualReturn2007

6.03%

2008

rr_AnnualReturn2008

(27.99%)

2009

rr_AnnualReturn2009

30.57%

2010

rr_AnnualReturn2010

13.25%

2011

rr_AnnualReturn2011

(1.02%)

2012

rr_AnnualReturn2012

11.05%

2013

rr_AnnualReturn2013

13.58%

2014

rr_AnnualReturn2014

5.18%

2015

rr_AnnualReturn2015

(0.75%)

2016

rr_AnnualReturn2016

6.07%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Sep. 30, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

10.32%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

15.11%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(14.80%)

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 50% | Fidelity Asset Manager 50%-Class M

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) on purchases (as a % of offering price)

rr_MaximumCumulativeSalesChargeOverOfferingPrice

3.50%

Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds)

rr_MaximumDeferredSalesChargeOverOther

none

^[1]

Management fee

rr_ManagementFeesOverAssets

0.50%

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

rr_DistributionAndService12b1FeesOverAssets

0.50%

Other expenses

rr_OtherExpensesOverAssets

0.21%

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.02%

Total annual operating expenses

rr_ExpensesOverAssets

1.23%

^[2]

Expenses Deferred Charges [Text Block]

rr_ExpensesDeferredChargesTextBlock

Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

1 year

rr_ExpenseExampleYear01

$ 471

3 years

rr_ExpenseExampleYear03

727

5 years

rr_ExpenseExampleYear05

1,002

10 years

rr_ExpenseExampleYear10

1,787

1 Year

rr_ExpenseExampleNoRedemptionYear01

471

3 Years

rr_ExpenseExampleNoRedemptionYear03

727

5 Years

rr_ExpenseExampleNoRedemptionYear05

1,002

10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 1,787

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 50% | Fidelity Asset Manager 50%-Class C

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) on purchases (as a % of offering price)

rr_MaximumCumulativeSalesChargeOverOfferingPrice

none

Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds)

rr_MaximumDeferredSalesChargeOverOther

1.00%

^[3]

Management fee

rr_ManagementFeesOverAssets

0.50%

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

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other expenses

rr_OtherExpensesOverAssets

0.22%

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.02%

Total annual operating expenses

rr_ExpensesOverAssets

1.74%

^[2]

Expenses Deferred Charges [Text Block]

rr_ExpensesDeferredChargesTextBlock

On Class C shares redeemed less than one year after purchase.

1 year

rr_ExpenseExampleYear01

$ 277

3 years

rr_ExpenseExampleYear03

548

5 years

rr_ExpenseExampleYear05

944

10 years

rr_ExpenseExampleYear10

2,052

1 Year

rr_ExpenseExampleNoRedemptionYear01

177

3 Years

rr_ExpenseExampleNoRedemptionYear03

548

5 Years

rr_ExpenseExampleNoRedemptionYear05

944

10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 2,052

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 50% | Fidelity Asset Manager 50%-Class I

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) on purchases (as a % of offering price)

rr_MaximumCumulativeSalesChargeOverOfferingPrice

none

Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds)

rr_MaximumDeferredSalesChargeOverOther

none

Management fee

rr_ManagementFeesOverAssets

0.50%

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

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.18%

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.02%

Total annual operating expenses

rr_ExpensesOverAssets

0.70%

^[2]

1 year

rr_ExpenseExampleYear01

$ 72

3 years

rr_ExpenseExampleYear03

224

5 years

rr_ExpenseExampleYear05

390

10 years

rr_ExpenseExampleYear10

871

1 Year

rr_ExpenseExampleNoRedemptionYear01

72

3 Years

rr_ExpenseExampleNoRedemptionYear03

224

5 Years

rr_ExpenseExampleNoRedemptionYear05

390

10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 871

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 50% | Return Before Taxes | Fidelity Asset Manager 50%-Class A

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 50%

Label

rr_AverageAnnualReturnLabel

Class A - Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

(0.03%)

Past 5 years

rr_AverageAnnualReturnYear05

5.65%

Past 10 years

rr_AverageAnnualReturnYear10

3.93%

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 50% | Return Before Taxes | Fidelity Asset Manager 50%-Class M

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 50%

Label

rr_AverageAnnualReturnLabel

Class M - Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

2.09%

Past 5 years

rr_AverageAnnualReturnYear05

5.90%

Past 10 years

rr_AverageAnnualReturnYear10

3.92%

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 50% | Return Before Taxes | Fidelity Asset Manager 50%-Class C

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 50%

Label

rr_AverageAnnualReturnLabel

Class C - Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

4.30%

Past 5 years

rr_AverageAnnualReturnYear05

6.11%

Past 10 years

rr_AverageAnnualReturnYear10

3.76%

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 50% | Return Before Taxes | Fidelity Asset Manager 50%-Class I

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 50%

Label

rr_AverageAnnualReturnLabel

Class I - Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

6.32%

Past 5 years

rr_AverageAnnualReturnYear05

7.19%

Past 10 years

rr_AverageAnnualReturnYear10

4.84%

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 50% | After Taxes on Distributions | Fidelity Asset Manager 50%-Class A

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 50%

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Past 1 year

rr_AverageAnnualReturnYear01

(0.61%)

Past 5 years

rr_AverageAnnualReturnYear05

4.29%

Past 10 years

rr_AverageAnnualReturnYear10

2.73%

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 50% | After Taxes on Distributions and Sales | Fidelity Asset Manager 50%-Class A

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 50%

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Past 1 year

rr_AverageAnnualReturnYear01

0.17%

Past 5 years

rr_AverageAnnualReturnYear05

4.10%

Past 10 years

rr_AverageAnnualReturnYear10

2.74%

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 50% | S&P 500® Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

11.96%

Past 5 years

rr_AverageAnnualReturnYear05

14.66%

Past 10 years

rr_AverageAnnualReturnYear10

6.95%

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 50% | Fidelity Asset Manager 50% Composite Index℠(reflects no deduction for fees or expenses)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

6.33%

Past 5 years

rr_AverageAnnualReturnYear05

7.14%

Past 10 years

rr_AverageAnnualReturnYear10

4.83%

[1] Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

[2] Differs from the ratios of expenses to average net assets in the Financial Highlights section of the prospectus because of acquired fund fees and expenses.

[3] On Class C shares redeemed less than one year after purchase.

XML

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 60%

Fund Summary

Fund/Class:
Fidelity Asset Manager® 60%/Fidelity Advisor Asset Manager® 60% A, M, C, I

Investment Objective

The fund seeks high total return over the long term by allocating its assets among stocks, bonds, short-term instruments, and other investments.

Fee Table

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the fund or certain other Fidelity^® funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page 50 of the prospectus. Different intermediaries may provide additional waivers or reductions of the sales charge. Please see “Sales Charge Waiver Policies Applied by Certain Intermediaries” in the “Appendix” section of the prospectus.

Shareholder fees

(fees paid directly from your investment)

Shareholder Fees {- Fidelity Asset Manager® 60%} - 09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 - Fidelity Asset Manager® 60%	Fidelity Asset Manager 60%-Class A		Fidelity Asset Manager 60%-Class M		Fidelity Asset Manager 60%-Class C		Fidelity Asset Manager 60%-Class I
Maximum sales charge (load) on purchases (as a % of offering price)	5.75%		3.50%		none		none
Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds)	none	[1]	none	[1]	1.00%	[2]	none

Annual Operating Expenses

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

Annual Operating Expenses {- Fidelity Asset Manager® 60%} - 09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 - Fidelity Asset Manager® 60%		Fidelity Asset Manager 60%-Class A	Fidelity Asset Manager 60%-Class M	Fidelity Asset Manager 60%-Class C	Fidelity Asset Manager 60%-Class I
Management fee		0.55%	0.55%	0.55%	0.55%
Distribution and/or Service (12b-1) fees		0.25%	0.50%	1.00%	none
Other expenses		0.23%	0.23%	0.23%	0.20%
Acquired fund fees and expenses		0.02%	0.02%	0.02%	0.02%
Total annual operating expenses	[1]	1.05%	1.30%	1.80%	0.77%

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

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 and if you hold your shares:

Sell All Shares

Expense Example {- Fidelity Asset Manager® 60%} - 09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 - Fidelity Asset Manager® 60% - USD ($)	Fidelity Asset Manager 60%-Class A	Fidelity Asset Manager 60%-Class M	Fidelity Asset Manager 60%-Class C	Fidelity Asset Manager 60%-Class I
1 year	$ 676	$ 478	$ 283	$ 79
3 years	890	748	566	246
5 years	1,121	1,038	975	428
10 years	$ 1,784	$ 1,863	$ 2,116	$ 954

Hold Shares

Expense Example, No Redemption {- Fidelity Asset Manager® 60%} - 09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 - Fidelity Asset Manager® 60% - USD ($)	Fidelity Asset Manager 60%-Class A	Fidelity Asset Manager 60%-Class M	Fidelity Asset Manager 60%-Class C	Fidelity Asset Manager 60%-Class I
1 Year	$ 676	$ 478	$ 183	$ 79
3 Years	890	748	566	246
5 Years	1,121	1,038	975	428
10 Years	$ 1,784	$ 1,863	$ 2,116	$ 954

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 operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 18% of the average value of its portfolio.

Principal Investment Strategies

• Allocating the fund's assets among three main asset classes: the stock class (equity securities of all types), the bond class (fixed-income securities of all types maturing in more than one year, including lower-quality debt securities which are sometimes referred to as high yield debt securities or junk bonds), and the short-term/money market class (fixed-income securities of all types maturing in one year or less).

• Maintaining a neutral mix over time of 60% of assets in stocks, 35% of assets in bonds, and 5% of assets in short-term and money market instruments.

• Adjusting allocation among asset classes gradually within the following ranges: stock class (40%-90%), bond class (10%-60%), and short-term/money market class (0%-50%).

• Investing in domestic and foreign issuers.

• Investing in Fidelity's central funds (specialized investment vehicles used by Fidelity^® funds to invest in particular security types or investment disciplines).

Principal Investment Risks

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.

• Foreign Exposure. Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile. Foreign exchange rates also can be extremely volatile.

• Prepayment. The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. Lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds) and certain types of other securities involve greater risk of default or price changes due to changes in the credit quality of the issuer. The value of lower-quality debt securities and certain types of other securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments.

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. You could lose money by investing in the fund.

Performance

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 and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit institutional.fidelity.com for more recent performance information.

The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown.

Year-by-Year Returns

Calendar Years

During the periods shown in the chart for Class A:	Returns	Quarter ended
Highest Quarter Return	16.69%	June 30, 2009
Lowest Quarter Return	-15.65%	December 31, 2008
Year-to-Date Return	11.99%	September 30, 2017

Average Annual Returns

Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges. After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

For the periods ended December 31, 2016

Average Annual Total Returns{- Fidelity Asset Manager® 60%} - 09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 - Fidelity Asset Manager® 60%	Past 1 year	Past 5 years	Since Inception	[1]	Inception Date
Fidelity Asset Manager 60%-Class A					Oct. 09, 2007
Fidelity Asset Manager 60%-Class A | Return Before Taxes	0.39%	6.55%	3.39%
Fidelity Asset Manager 60%-Class A | After Taxes on Distributions	0.01%	5.50%	2.59%		Oct. 09, 2007
Fidelity Asset Manager 60%-Class A | After Taxes on Distributions and Sales	0.37%	4.92%	2.46%		Oct. 09, 2007
Fidelity Asset Manager 60%-Class M					Oct. 09, 2007
Fidelity Asset Manager 60%-Class M | Return Before Taxes	2.48%	6.78%	3.38%
Fidelity Asset Manager 60%-Class C					Oct. 09, 2007
Fidelity Asset Manager 60%-Class C | Return Before Taxes	4.68%	7.01%	3.27%
Fidelity Asset Manager 60%-Class I					Oct. 09, 2007
Fidelity Asset Manager 60%-Class I | Return Before Taxes	6.74%	8.10%	4.32%
S&P 500® Index(reflects no deduction for fees, expenses, or taxes)	11.96%	14.66%	6.24%
Fidelity Asset Manager 60% Composite Index℠(reflects no deduction for fees or expenses)	7.21%	8.27%	4.55%

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 60% | Fidelity Asset Manager 60%-Class A

Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 60% | Fidelity Asset Manager 60%-Class M

Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 60% | Fidelity Asset Manager 60%-Class C

On Class C shares redeemed less than one year after purchase.

[1] Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

[2] On Class C shares redeemed less than one year after purchase.

[1] Differs from the ratios of expenses to average net assets in the Financial Highlights section of the prospectus because of acquired fund fees and expenses.

[1] From October 9, 2007

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY CHARLES STREET TRUST

Prospectus Date

rr_ProspectusDate

Nov. 29, 2017

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 60%

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund/Class:
Fidelity Asset Manager® 60%/Fidelity Advisor Asset Manager® 60% A, M, C, I

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks high total return over the long term by allocating its assets among stocks, bonds, short-term instruments, and other investments.

Expense [Heading]

rr_ExpenseHeading

Fee Table

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the fund or certain other Fidelity^® funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page 50 of the prospectus. Different intermediaries may provide additional waivers or reductions of the sales charge. Please see “Sales Charge Waiver Policies Applied by Certain Intermediaries” in the “Appendix” section of the prospectus.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder fees

(fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Operating Expenses

(expenses that you pay each year as a % 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 operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 18% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

18.00%

Expense Breakpoint Discounts [Text]

rr_ExpenseBreakpointDiscounts

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the fund or certain other Fidelity® funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page 50 of the prospectus.

Expense Breakpoint, Minimum Investment Required [Amount]

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

$ 50,000

Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text]

rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees

Differs from the ratios of expenses to average net assets in the Financial Highlights section of the prospectus because of acquired fund fees and expenses.

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

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 and if you hold your shares:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Sell All Shares

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

rr_ExpenseExampleNoRedemptionByYearCaption

Hold Shares

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

• Allocating the fund's assets among three main asset classes: the stock class (equity securities of all types), the bond class (fixed-income securities of all types maturing in more than one year, including lower-quality debt securities which are sometimes referred to as high yield debt securities or junk bonds), and the short-term/money market class (fixed-income securities of all types maturing in one year or less).

• Maintaining a neutral mix over time of 60% of assets in stocks, 35% of assets in bonds, and 5% of assets in short-term and money market instruments.

• Adjusting allocation among asset classes gradually within the following ranges: stock class (40%-90%), bond class (10%-60%), and short-term/money market class (0%-50%).

• Investing in domestic and foreign issuers.

• Investing in Fidelity's central funds (specialized investment vehicles used by Fidelity^® funds to invest in particular security types or investment disciplines).

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.

• Foreign Exposure. Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile. Foreign exchange rates also can be extremely volatile.

• Prepayment. The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. Lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds) and certain types of other securities involve greater risk of default or price changes due to changes in the credit quality of the issuer. The value of lower-quality debt securities and certain types of other securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments.

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. You could lose money by investing in the fund.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could 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 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 and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit institutional.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

institutional.fidelity.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

rr_BarChartHeading

Year-by-Year Returns

Calendar Years

Bar Chart Narrative [Text Block]

rr_BarChartNarrativeTextBlock

The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown.

Bar Chart Does Not Reflect Sales Loads [Text]

rr_BarChartDoesNotReflectSalesLoads

The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown.

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the periods shown in the chart for Class A:	Returns	Quarter ended
Highest Quarter Return	16.69%	June 30, 2009
Lowest Quarter Return	-15.65%	December 31, 2008
Year-to-Date Return	11.99%	September 30, 2017

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Returns

Performance Table Does Reflect Sales Loads

rr_PerformanceTableDoesReflectSalesLoads

Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges.

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

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

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table One Class of after Tax Shown [Text]

rr_PerformanceTableOneClassOfAfterTaxShown

After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary.

Performance Table Explanation after Tax Higher

rr_PerformanceTableExplanationAfterTaxHigher

Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges. After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

For the periods ended December 31, 2016

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 60% | Fidelity Asset Manager 60%-Class A

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) on purchases (as a % of offering price)

rr_MaximumCumulativeSalesChargeOverOfferingPrice

5.75%

Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds)

rr_MaximumDeferredSalesChargeOverOther

none

^[1]

Management fee

rr_ManagementFeesOverAssets

0.55%

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

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other expenses

rr_OtherExpensesOverAssets

0.23%

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.02%

Total annual operating expenses

rr_ExpensesOverAssets

1.05%

^[2]

Expenses Deferred Charges [Text Block]

rr_ExpensesDeferredChargesTextBlock

Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

1 year

rr_ExpenseExampleYear01

$ 676

3 years

rr_ExpenseExampleYear03

890

5 years

rr_ExpenseExampleYear05

1,121

10 years

rr_ExpenseExampleYear10

1,784

1 Year

rr_ExpenseExampleNoRedemptionYear01

676

3 Years

rr_ExpenseExampleNoRedemptionYear03

890

5 Years

rr_ExpenseExampleNoRedemptionYear05

1,121

10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 1,784

2008

rr_AnnualReturn2008

(30.15%)

2009

rr_AnnualReturn2009

32.37%

2010

rr_AnnualReturn2010

14.03%

2011

rr_AnnualReturn2011

(2.51%)

2012

rr_AnnualReturn2012

12.39%

2013

rr_AnnualReturn2013

16.57%

2014

rr_AnnualReturn2014

5.35%

2015

rr_AnnualReturn2015

(0.87%)

2016

rr_AnnualReturn2016

6.52%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Sep. 30, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

11.99%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

16.69%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(15.65%)

Inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 09, 2007

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 60% | Fidelity Asset Manager 60%-Class M

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) on purchases (as a % of offering price)

rr_MaximumCumulativeSalesChargeOverOfferingPrice

3.50%

Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds)

rr_MaximumDeferredSalesChargeOverOther

none

^[1]

Management fee

rr_ManagementFeesOverAssets

0.55%

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

rr_DistributionAndService12b1FeesOverAssets

0.50%

Other expenses

rr_OtherExpensesOverAssets

0.23%

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.02%

Total annual operating expenses

rr_ExpensesOverAssets

1.30%

^[2]

Expenses Deferred Charges [Text Block]

rr_ExpensesDeferredChargesTextBlock

Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

1 year

rr_ExpenseExampleYear01

$ 478

3 years

rr_ExpenseExampleYear03

748

5 years

rr_ExpenseExampleYear05

1,038

10 years

rr_ExpenseExampleYear10

1,863

1 Year

rr_ExpenseExampleNoRedemptionYear01

478

3 Years

rr_ExpenseExampleNoRedemptionYear03

748

5 Years

rr_ExpenseExampleNoRedemptionYear05

1,038

10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 1,863

Inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 09, 2007

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 60% | Fidelity Asset Manager 60%-Class C

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) on purchases (as a % of offering price)

rr_MaximumCumulativeSalesChargeOverOfferingPrice

none

Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds)

rr_MaximumDeferredSalesChargeOverOther

1.00%

^[3]

Management fee

rr_ManagementFeesOverAssets

0.55%

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

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other expenses

rr_OtherExpensesOverAssets

0.23%

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.02%

Total annual operating expenses

rr_ExpensesOverAssets

1.80%

^[2]

Expenses Deferred Charges [Text Block]

rr_ExpensesDeferredChargesTextBlock

On Class C shares redeemed less than one year after purchase.

1 year

rr_ExpenseExampleYear01

$ 283

3 years

rr_ExpenseExampleYear03

566

5 years

rr_ExpenseExampleYear05

975

10 years

rr_ExpenseExampleYear10

2,116

1 Year

rr_ExpenseExampleNoRedemptionYear01

183

3 Years

rr_ExpenseExampleNoRedemptionYear03

566

5 Years

rr_ExpenseExampleNoRedemptionYear05

975

10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 2,116

Inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 09, 2007

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 60% | Fidelity Asset Manager 60%-Class I

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) on purchases (as a % of offering price)

rr_MaximumCumulativeSalesChargeOverOfferingPrice

none

Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds)

rr_MaximumDeferredSalesChargeOverOther

none

Management fee

rr_ManagementFeesOverAssets

0.55%

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

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.20%

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.02%

Total annual operating expenses

rr_ExpensesOverAssets

0.77%

^[2]

1 year

rr_ExpenseExampleYear01

$ 79

3 years

rr_ExpenseExampleYear03

246

5 years

rr_ExpenseExampleYear05

428

10 years

rr_ExpenseExampleYear10

954

1 Year

rr_ExpenseExampleNoRedemptionYear01

79

3 Years

rr_ExpenseExampleNoRedemptionYear03

246

5 Years

rr_ExpenseExampleNoRedemptionYear05

428

10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 954

Inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 09, 2007

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 60% | Return Before Taxes | Fidelity Asset Manager 60%-Class A

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 60%

Label

rr_AverageAnnualReturnLabel

Class A - Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

0.39%

Past 5 years

rr_AverageAnnualReturnYear05

6.55%

Since Inception

rr_AverageAnnualReturnSinceInception

3.39%

^[4]

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 60% | Return Before Taxes | Fidelity Asset Manager 60%-Class M

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 60%

Label

rr_AverageAnnualReturnLabel

Class M - Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

2.48%

Past 5 years

rr_AverageAnnualReturnYear05

6.78%

Since Inception

rr_AverageAnnualReturnSinceInception

3.38%

^[4]

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 60% | Return Before Taxes | Fidelity Asset Manager 60%-Class C

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 60%

Label

rr_AverageAnnualReturnLabel

Class C - Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

4.68%

Past 5 years

rr_AverageAnnualReturnYear05

7.01%

Since Inception

rr_AverageAnnualReturnSinceInception

3.27%

^[4]

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 60% | Return Before Taxes | Fidelity Asset Manager 60%-Class I

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 60%

Label

rr_AverageAnnualReturnLabel

Class I - Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

6.74%

Past 5 years

rr_AverageAnnualReturnYear05

8.10%

Since Inception

rr_AverageAnnualReturnSinceInception

4.32%

^[4]

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 60% | After Taxes on Distributions | Fidelity Asset Manager 60%-Class A

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 60%

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Past 1 year

rr_AverageAnnualReturnYear01

0.01%

Past 5 years

rr_AverageAnnualReturnYear05

5.50%

Since Inception

rr_AverageAnnualReturnSinceInception

2.59%

^[4]

Inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 09, 2007

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 60% | After Taxes on Distributions and Sales | Fidelity Asset Manager 60%-Class A

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 60%

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Past 1 year

rr_AverageAnnualReturnYear01

0.37%

Past 5 years

rr_AverageAnnualReturnYear05

4.92%

Since Inception

rr_AverageAnnualReturnSinceInception

2.46%

^[4]

Inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 09, 2007

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 60% | S&P 500® Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

11.96%

Past 5 years

rr_AverageAnnualReturnYear05

14.66%

Since Inception

rr_AverageAnnualReturnSinceInception

6.24%

^[4]

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 60% | Fidelity Asset Manager 60% Composite Index℠(reflects no deduction for fees or expenses)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

7.21%

Past 5 years

rr_AverageAnnualReturnYear05

8.27%

Since Inception

rr_AverageAnnualReturnSinceInception

4.55%

^[4]

[1] Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

[2] Differs from the ratios of expenses to average net assets in the Financial Highlights section of the prospectus because of acquired fund fees and expenses.

[3] On Class C shares redeemed less than one year after purchase.

[4] From October 9, 2007

XML

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 70%

Fund Summary

Fund/Class:
Fidelity Asset Manager® 70%/Fidelity Advisor Asset Manager® 70% A, M, C, I

Investment Objective

The fund seeks to maximize total return over the long term by allocating its assets among stocks, bonds, short-term instruments, and other investments.

Fee Table

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the fund or certain other Fidelity^® funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page 50 of the prospectus. Different intermediaries may provide additional waivers or reductions of the sales charge. Please see “Sales Charge Waiver Policies Applied by Certain Intermediaries” in the “Appendix” section of the prospectus.

Shareholder fees

(fees paid directly from your investment)

Shareholder Fees {- Fidelity Asset Manager® 70%} - 09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 - Fidelity Asset Manager® 70%	Fidelity Asset Manager 70%-Class A		Fidelity Asset Manager 70%-Class M		Fidelity Asset Manager 70%-Class C		Fidelity Asset Manager 70%-Class I
Maximum sales charge (load) on purchases (as a % of offering price)	5.75%		3.50%		none		none
Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds)	none	[1]	none	[1]	1.00%	[2]	none

Annual Operating Expenses

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

Annual Operating Expenses {- Fidelity Asset Manager® 70%} - 09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 - Fidelity Asset Manager® 70%		Fidelity Asset Manager 70%-Class A	Fidelity Asset Manager 70%-Class M	Fidelity Asset Manager 70%-Class C	Fidelity Asset Manager 70%-Class I
Management fee		0.55%	0.55%	0.55%	0.55%
Distribution and/or Service (12b-1) fees		0.25%	0.50%	1.00%	none
Other expenses		0.22%	0.22%	0.22%	0.19%
Acquired fund fees and expenses		0.02%	0.02%	0.02%	0.02%
Total annual operating expenses	[1]	1.04%	1.29%	1.79%	0.76%

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

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 and if you hold your shares:

Sell All Shares

Expense Example {- Fidelity Asset Manager® 70%} - 09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 - Fidelity Asset Manager® 70% - USD ($)	Fidelity Asset Manager 70%-Class A	Fidelity Asset Manager 70%-Class M	Fidelity Asset Manager 70%-Class C	Fidelity Asset Manager 70%-Class I
1 year	$ 675	$ 477	$ 282	$ 78
3 years	887	745	563	243
5 years	1,116	1,033	970	422
10 years	$ 1,773	$ 1,852	$ 2,105	$ 942

Hold Shares

Expense Example, No Redemption {- Fidelity Asset Manager® 70%} - 09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 - Fidelity Asset Manager® 70% - USD ($)	Fidelity Asset Manager 70%-Class A	Fidelity Asset Manager 70%-Class M	Fidelity Asset Manager 70%-Class C	Fidelity Asset Manager 70%-Class I
1 Year	$ 675	$ 477	$ 182	$ 78
3 Years	887	745	563	243
5 Years	1,116	1,033	970	422
10 Years	$ 1,773	$ 1,852	$ 2,105	$ 942

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 operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 19% of the average value of its portfolio.

Principal Investment Strategies

• Allocating the fund's assets among three main asset classes: the stock class (equity securities of all types), the bond class (fixed-income securities of all types maturing in more than one year, including lower-quality debt securities which are sometimes referred to as high yield debt securities or junk bonds), and the short-term/money market class (fixed-income securities of all types maturing in one year or less).

• Maintaining a neutral mix over time of 70% of assets in stocks, 25% of assets in bonds, and 5% of assets in short-term and money market instruments.

• Adjusting allocation among asset classes gradually within the following ranges: stock class (50%-100%), bond class (0%-50%), and short-term/money market class (0%-50%).

• Investing in domestic and foreign issuers.

• Investing in Fidelity's central funds (specialized investment vehicles used by Fidelity^® funds to invest in particular security types or investment disciplines).

Principal Investment Risks

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.

• Foreign Exposure. Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile. Foreign exchange rates also can be extremely volatile.

• Prepayment. The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. Lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds) and certain types of other securities involve greater risk of default or price changes due to changes in the credit quality of the issuer. The value of lower-quality debt securities and certain types of other securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments.

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. You could lose money by investing in the fund.

Performance

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 and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit institutional.fidelity.com for more recent performance information.

The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown.

Year-by-Year Returns

Calendar Years

During the periods shown in the chart for Class A:	Returns	Quarter ended
Highest Quarter Return	18.36%	June 30, 2009
Lowest Quarter Return	-13.21%	September 30, 2011
Year-to-Date Return	13.57%	September 30, 2017

Average Annual Returns

Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges. After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

For the periods ended December 31, 2016

Average Annual Total Returns{- Fidelity Asset Manager® 70%} - 09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 - Fidelity Asset Manager® 70%	Past 1 year	Past 5 years	Since Inception	[1]	Inception Date
Fidelity Asset Manager 70%-Class A					Sep. 23, 2008
Fidelity Asset Manager 70%-Class A | Return Before Taxes	0.62%	7.43%	6.42%
Fidelity Asset Manager 70%-Class A | After Taxes on Distributions	0.28%	6.46%	5.64%		Sep. 23, 2008
Fidelity Asset Manager 70%-Class A | After Taxes on Distributions and Sales	0.53%	5.70%	4.98%		Sep. 23, 2008
Fidelity Asset Manager 70%-Class M					Sep. 23, 2008
Fidelity Asset Manager 70%-Class M | Return Before Taxes	2.77%	7.65%	6.45%
Fidelity Asset Manager 70%-Class C					Sep. 23, 2008
Fidelity Asset Manager 70%-Class C | Return Before Taxes	4.94%	7.89%	6.39%
Fidelity Asset Manager 70%-Class I					Sep. 23, 2008
Fidelity Asset Manager 70%-Class I | Return Before Taxes	7.11%	9.01%	7.49%
S&P 500® Index(reflects no deduction for fees, expenses, or taxes)	11.96%	14.66%	10.33%
Fidelity Asset Manager 70% Composite Index℠(reflects no deduction for fees or expenses)	7.95%	9.27%	7.10%

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 70% | Fidelity Asset Manager 70%-Class A

Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 70% | Fidelity Asset Manager 70%-Class M

Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 70% | Fidelity Asset Manager 70%-Class C

On Class C shares redeemed less than one year after purchase.

[1] Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

[2] On Class C shares redeemed less than one year after purchase.

[1] Differs from the ratios of expenses to average net assets in the Financial Highlights section of the prospectus because of acquired fund fees and expenses.

[1] From September 23, 2008

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY CHARLES STREET TRUST

Prospectus Date

rr_ProspectusDate

Nov. 29, 2017

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 70%

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund/Class:
Fidelity Asset Manager® 70%/Fidelity Advisor Asset Manager® 70% A, M, C, I

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks to maximize total return over the long term by allocating its assets among stocks, bonds, short-term instruments, and other investments.

Expense [Heading]

rr_ExpenseHeading

Fee Table

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the fund or certain other Fidelity^® funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page 50 of the prospectus. Different intermediaries may provide additional waivers or reductions of the sales charge. Please see “Sales Charge Waiver Policies Applied by Certain Intermediaries” in the “Appendix” section of the prospectus.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder fees

(fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Operating Expenses

(expenses that you pay each year as a % 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 operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 19% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

19.00%

Expense Breakpoint Discounts [Text]

rr_ExpenseBreakpointDiscounts

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the fund or certain other Fidelity® funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page 50 of the prospectus.

Expense Breakpoint, Minimum Investment Required [Amount]

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

$ 50,000

Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text]

rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees

Differs from the ratios of expenses to average net assets in the Financial Highlights section of the prospectus because of acquired fund fees and expenses.

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

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 and if you hold your shares:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Sell All Shares

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

rr_ExpenseExampleNoRedemptionByYearCaption

Hold Shares

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

• Allocating the fund's assets among three main asset classes: the stock class (equity securities of all types), the bond class (fixed-income securities of all types maturing in more than one year, including lower-quality debt securities which are sometimes referred to as high yield debt securities or junk bonds), and the short-term/money market class (fixed-income securities of all types maturing in one year or less).

• Maintaining a neutral mix over time of 70% of assets in stocks, 25% of assets in bonds, and 5% of assets in short-term and money market instruments.

• Adjusting allocation among asset classes gradually within the following ranges: stock class (50%-100%), bond class (0%-50%), and short-term/money market class (0%-50%).

• Investing in domestic and foreign issuers.

• Investing in Fidelity's central funds (specialized investment vehicles used by Fidelity^® funds to invest in particular security types or investment disciplines).

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.

• Foreign Exposure. Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile. Foreign exchange rates also can be extremely volatile.

• Prepayment. The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. Lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds) and certain types of other securities involve greater risk of default or price changes due to changes in the credit quality of the issuer. The value of lower-quality debt securities and certain types of other securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments.

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. You could lose money by investing in the fund.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could 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 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 and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit institutional.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

institutional.fidelity.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

rr_BarChartHeading

Year-by-Year Returns

Calendar Years

Bar Chart Narrative [Text Block]

rr_BarChartNarrativeTextBlock

The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown.

Bar Chart Does Not Reflect Sales Loads [Text]

rr_BarChartDoesNotReflectSalesLoads

The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown.

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the periods shown in the chart for Class A:	Returns	Quarter ended
Highest Quarter Return	18.36%	June 30, 2009
Lowest Quarter Return	-13.21%	September 30, 2011
Year-to-Date Return	13.57%	September 30, 2017

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Returns

Performance Table Does Reflect Sales Loads

rr_PerformanceTableDoesReflectSalesLoads

Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges.

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

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

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table One Class of after Tax Shown [Text]

rr_PerformanceTableOneClassOfAfterTaxShown

After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary.

Performance Table Explanation after Tax Higher

rr_PerformanceTableExplanationAfterTaxHigher

Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges. After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

For the periods ended December 31, 2016

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 70% | Fidelity Asset Manager 70%-Class A

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) on purchases (as a % of offering price)

rr_MaximumCumulativeSalesChargeOverOfferingPrice

5.75%

Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds)

rr_MaximumDeferredSalesChargeOverOther

none

^[1]

Management fee

rr_ManagementFeesOverAssets

0.55%

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

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other expenses

rr_OtherExpensesOverAssets

0.22%

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.02%

Total annual operating expenses

rr_ExpensesOverAssets

1.04%

^[2]

Expenses Deferred Charges [Text Block]

rr_ExpensesDeferredChargesTextBlock

Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

1 year

rr_ExpenseExampleYear01

$ 675

3 years

rr_ExpenseExampleYear03

887

5 years

rr_ExpenseExampleYear05

1,116

10 years

rr_ExpenseExampleYear10

1,773

1 Year

rr_ExpenseExampleNoRedemptionYear01

675

3 Years

rr_ExpenseExampleNoRedemptionYear03

887

5 Years

rr_ExpenseExampleNoRedemptionYear05

1,116

10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 1,773

2009

rr_AnnualReturn2009

35.31%

2010

rr_AnnualReturn2010

15.31%

2011

rr_AnnualReturn2011

(4.02%)

2012

rr_AnnualReturn2012

13.76%

2013

rr_AnnualReturn2013

19.75%

2014

rr_AnnualReturn2014

5.29%

2015

rr_AnnualReturn2015

(0.87%)

2016

rr_AnnualReturn2016

6.76%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Sep. 30, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

13.57%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

18.36%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Sep. 30, 2011

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(13.21%)

Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 23, 2008

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 70% | Fidelity Asset Manager 70%-Class M

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) on purchases (as a % of offering price)

rr_MaximumCumulativeSalesChargeOverOfferingPrice

3.50%

Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds)

rr_MaximumDeferredSalesChargeOverOther

none

^[1]

Management fee

rr_ManagementFeesOverAssets

0.55%

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

rr_DistributionAndService12b1FeesOverAssets

0.50%

Other expenses

rr_OtherExpensesOverAssets

0.22%

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.02%

Total annual operating expenses

rr_ExpensesOverAssets

1.29%

^[2]

Expenses Deferred Charges [Text Block]

rr_ExpensesDeferredChargesTextBlock

Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

1 year

rr_ExpenseExampleYear01

$ 477

3 years

rr_ExpenseExampleYear03

745

5 years

rr_ExpenseExampleYear05

1,033

10 years

rr_ExpenseExampleYear10

1,852

1 Year

rr_ExpenseExampleNoRedemptionYear01

477

3 Years

rr_ExpenseExampleNoRedemptionYear03

745

5 Years

rr_ExpenseExampleNoRedemptionYear05

1,033

10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 1,852

Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 23, 2008

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 70% | Fidelity Asset Manager 70%-Class C

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) on purchases (as a % of offering price)

rr_MaximumCumulativeSalesChargeOverOfferingPrice

none

Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds)

rr_MaximumDeferredSalesChargeOverOther

1.00%

^[3]

Management fee

rr_ManagementFeesOverAssets

0.55%

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

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other expenses

rr_OtherExpensesOverAssets

0.22%

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.02%

Total annual operating expenses

rr_ExpensesOverAssets

1.79%

^[2]

Expenses Deferred Charges [Text Block]

rr_ExpensesDeferredChargesTextBlock

On Class C shares redeemed less than one year after purchase.

1 year

rr_ExpenseExampleYear01

$ 282

3 years

rr_ExpenseExampleYear03

563

5 years

rr_ExpenseExampleYear05

970

10 years

rr_ExpenseExampleYear10

2,105

1 Year

rr_ExpenseExampleNoRedemptionYear01

182

3 Years

rr_ExpenseExampleNoRedemptionYear03

563

5 Years

rr_ExpenseExampleNoRedemptionYear05

970

10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 2,105

Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 23, 2008

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 70% | Fidelity Asset Manager 70%-Class I

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) on purchases (as a % of offering price)

rr_MaximumCumulativeSalesChargeOverOfferingPrice

none

Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds)

rr_MaximumDeferredSalesChargeOverOther

none

Management fee

rr_ManagementFeesOverAssets

0.55%

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

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.19%

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.02%

Total annual operating expenses

rr_ExpensesOverAssets

0.76%

^[2]

1 year

rr_ExpenseExampleYear01

$ 78

3 years

rr_ExpenseExampleYear03

243

5 years

rr_ExpenseExampleYear05

422

10 years

rr_ExpenseExampleYear10

942

1 Year

rr_ExpenseExampleNoRedemptionYear01

78

3 Years

rr_ExpenseExampleNoRedemptionYear03

243

5 Years

rr_ExpenseExampleNoRedemptionYear05

422

10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 942

Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 23, 2008

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 70% | Return Before Taxes | Fidelity Asset Manager 70%-Class A

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 70%

Label

rr_AverageAnnualReturnLabel

Class A - Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

0.62%

Past 5 years

rr_AverageAnnualReturnYear05

7.43%

Since Inception

rr_AverageAnnualReturnSinceInception

6.42%

^[4]

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 70% | Return Before Taxes | Fidelity Asset Manager 70%-Class M

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 70%

Label

rr_AverageAnnualReturnLabel

Class M - Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

2.77%

Past 5 years

rr_AverageAnnualReturnYear05

7.65%

Since Inception

rr_AverageAnnualReturnSinceInception

6.45%

^[4]

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 70% | Return Before Taxes | Fidelity Asset Manager 70%-Class C

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 70%

Label

rr_AverageAnnualReturnLabel

Class C - Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

4.94%

Past 5 years

rr_AverageAnnualReturnYear05

7.89%

Since Inception

rr_AverageAnnualReturnSinceInception

6.39%

^[4]

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 70% | Return Before Taxes | Fidelity Asset Manager 70%-Class I

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 70%

Label

rr_AverageAnnualReturnLabel

Class I - Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

7.11%

Past 5 years

rr_AverageAnnualReturnYear05

9.01%

Since Inception

rr_AverageAnnualReturnSinceInception

7.49%

^[4]

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 70% | After Taxes on Distributions | Fidelity Asset Manager 70%-Class A

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 70%

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Past 1 year

rr_AverageAnnualReturnYear01

0.28%

Past 5 years

rr_AverageAnnualReturnYear05

6.46%

Since Inception

rr_AverageAnnualReturnSinceInception

5.64%

^[4]

Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 23, 2008

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 70% | After Taxes on Distributions and Sales | Fidelity Asset Manager 70%-Class A

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 70%

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Past 1 year

rr_AverageAnnualReturnYear01

0.53%

Past 5 years

rr_AverageAnnualReturnYear05

5.70%

Since Inception

rr_AverageAnnualReturnSinceInception

4.98%

^[4]

Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 23, 2008

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 70% | S&P 500® Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

11.96%

Past 5 years

rr_AverageAnnualReturnYear05

14.66%

Since Inception

rr_AverageAnnualReturnSinceInception

10.33%

^[4]

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 70% | Fidelity Asset Manager 70% Composite Index℠(reflects no deduction for fees or expenses)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

7.95%

Past 5 years

rr_AverageAnnualReturnYear05

9.27%

Since Inception

rr_AverageAnnualReturnSinceInception

7.10%

^[4]

[1] Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

[2] Differs from the ratios of expenses to average net assets in the Financial Highlights section of the prospectus because of acquired fund fees and expenses.

[3] On Class C shares redeemed less than one year after purchase.

[4] From September 23, 2008

XML

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 85%

Fund Summary

Fund/Class:
Fidelity Asset Manager® 85%/Fidelity Advisor Asset Manager® 85% A, M, C, I

Investment Objective

The fund seeks to maximize total return over the long term by allocating its assets among stocks, bonds, short-term instruments, and other investments.

Fee Table

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the fund or certain other Fidelity^® funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page 50 of the prospectus. Different intermediaries may provide additional waivers or reductions of the sales charge. Please see “Sales Charge Waiver Policies Applied by Certain Intermediaries” in the “Appendix” section of the prospectus.

Shareholder fees

(fees paid directly from your investment)

Shareholder Fees {- Fidelity Asset Manager® 85%} - 09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 - Fidelity Asset Manager® 85%	Fidelity Asset Manager 85%-Class A		Fidelity Asset Manager 85%-Class M		Fidelity Asset Manager 85%-Class C		Fidelity Asset Manager 85%-Class I
Maximum sales charge (load) on purchases (as a % of offering price)	5.75%		3.50%		none		none
Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds)	none	[1]	none	[1]	1.00%	[2]	none

Annual Operating Expenses

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

Annual Operating Expenses {- Fidelity Asset Manager® 85%} - 09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 - Fidelity Asset Manager® 85%		Fidelity Asset Manager 85%-Class A	Fidelity Asset Manager 85%-Class M	Fidelity Asset Manager 85%-Class C	Fidelity Asset Manager 85%-Class I
Management fee		0.55%	0.55%	0.55%	0.55%
Distribution and/or Service (12b-1) fees		0.25%	0.50%	1.00%	none
Other expenses		0.24%	0.26%	0.24%	0.21%
Acquired fund fees and expenses		0.02%	0.02%	0.02%	0.02%
Total annual operating expenses	[1]	1.06%	1.33%	1.81%	0.78%

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

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 and if you hold your shares:

Sell All Shares

Expense Example {- Fidelity Asset Manager® 85%} - 09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 - Fidelity Asset Manager® 85% - USD ($)	Fidelity Asset Manager 85%-Class A	Fidelity Asset Manager 85%-Class M	Fidelity Asset Manager 85%-Class C	Fidelity Asset Manager 85%-Class I
1 year	$ 677	$ 481	$ 284	$ 80
3 years	893	757	569	249
5 years	1,126	1,053	980	433
10 years	$ 1,795	$ 1,895	$ 2,127	$ 966

Hold Shares

Expense Example, No Redemption {- Fidelity Asset Manager® 85%} - 09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 - Fidelity Asset Manager® 85% - USD ($)	Fidelity Asset Manager 85%-Class A	Fidelity Asset Manager 85%-Class M	Fidelity Asset Manager 85%-Class C	Fidelity Asset Manager 85%-Class I
1 Year	$ 677	$ 481	$ 184	$ 80
3 Years	893	757	569	249
5 Years	1,126	1,053	980	433
10 Years	$ 1,795	$ 1,895	$ 2,127	$ 966

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 operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 23% of the average value of its portfolio.

Principal Investment Strategies

• Allocating the fund's assets between two main asset classes: the stock class (equity securities of all types) and the bond and short-term/money market class (fixed-income securities of all types and maturities, including lower-quality debt securities which are sometimes referred to as high yield debt securities or junk bonds).

• Maintaining a neutral mix over time of 85% of assets in stocks and 15% of assets in bonds and short-term and money market instruments.

• Adjusting allocation between asset classes gradually within the following ranges: stock class (60%-100%) and bond and short-term/money market class (0%-40%).

• Investing in domestic and foreign issuers.

• Investing in Fidelity's central funds (specialized investment vehicles used by Fidelity^® funds to invest in particular security types or investment disciplines).

Principal Investment Risks

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.

• Foreign Exposure. Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile. Foreign exchange rates also can be extremely volatile.

• Prepayment. The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. Lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds) and certain types of other securities involve greater risk of default or price changes due to changes in the credit quality of the issuer. The value of lower-quality debt securities and certain types of other securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments.

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. You could lose money by investing in the fund.

Performance

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 and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit institutional.fidelity.com for more recent performance information.

The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown.

Year-by-Year Returns

Calendar Years

During the periods shown in the chart for Class A:	Returns	Quarter ended
Highest Quarter Return	20.68%	June 30, 2009
Lowest Quarter Return	-20.98%	December 31, 2008
Year-to-Date Return	16.05%	September 30, 2017

Average Annual Returns

Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges. After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

For the periods ended December 31, 2016

Average Annual Total Returns{- Fidelity Asset Manager® 85%} - 09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 - Fidelity Asset Manager® 85%	Past 1 year	Past 5 years	Past 10 years
Fidelity Asset Manager 85%-Class A | Return Before Taxes	0.97%	8.79%	4.24%
Fidelity Asset Manager 85%-Class A | After Taxes on Distributions	0.72%	7.74%	3.59%
Fidelity Asset Manager 85%-Class A | After Taxes on Distributions and Sales	0.75%	6.80%	3.26%
Fidelity Asset Manager 85%-Class M | Return Before Taxes	3.05%	8.99%	4.19%
Fidelity Asset Manager 85%-Class C | Return Before Taxes	5.32%	9.26%	4.05%
Fidelity Asset Manager 85%-Class I | Return Before Taxes	7.39%	10.39%	5.17%
S&P 500® Index(reflects no deduction for fees, expenses, or taxes)	11.96%	14.66%	6.95%
Fidelity Asset Manager 85% Composite Index℠(reflects no deduction for fees or expenses)	9.22%	10.92%	5.42%

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 85% | Fidelity Asset Manager 85%-Class A

Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 85% | Fidelity Asset Manager 85%-Class M

Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 85% | Fidelity Asset Manager 85%-Class C

On Class C shares redeemed less than one year after purchase.

[1] Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

[2] On Class C shares redeemed less than one year after purchase.

[1] Differs from the ratios of expenses to average net assets in the Financial Highlights section of the prospectus because of acquired fund fees and expenses.

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY CHARLES STREET TRUST

Prospectus Date

rr_ProspectusDate

Nov. 29, 2017

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 85%

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund/Class:
Fidelity Asset Manager® 85%/Fidelity Advisor Asset Manager® 85% A, M, C, I

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks to maximize total return over the long term by allocating its assets among stocks, bonds, short-term instruments, and other investments.

Expense [Heading]

rr_ExpenseHeading

Fee Table

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the fund or certain other Fidelity^® funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page 50 of the prospectus. Different intermediaries may provide additional waivers or reductions of the sales charge. Please see “Sales Charge Waiver Policies Applied by Certain Intermediaries” in the “Appendix” section of the prospectus.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder fees

(fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Operating Expenses

(expenses that you pay each year as a % 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 operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 23% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

23.00%

Expense Breakpoint Discounts [Text]

rr_ExpenseBreakpointDiscounts

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the fund or certain other Fidelity® funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page 50 of the prospectus.

Expense Breakpoint, Minimum Investment Required [Amount]

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

$ 50,000

Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text]

rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees

Differs from the ratios of expenses to average net assets in the Financial Highlights section of the prospectus because of acquired fund fees and expenses.

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

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 and if you hold your shares:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Sell All Shares

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

rr_ExpenseExampleNoRedemptionByYearCaption

Hold Shares

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

• Allocating the fund's assets between two main asset classes: the stock class (equity securities of all types) and the bond and short-term/money market class (fixed-income securities of all types and maturities, including lower-quality debt securities which are sometimes referred to as high yield debt securities or junk bonds).

• Maintaining a neutral mix over time of 85% of assets in stocks and 15% of assets in bonds and short-term and money market instruments.

• Adjusting allocation between asset classes gradually within the following ranges: stock class (60%-100%) and bond and short-term/money market class (0%-40%).

• Investing in domestic and foreign issuers.

• Investing in Fidelity's central funds (specialized investment vehicles used by Fidelity^® funds to invest in particular security types or investment disciplines).

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.

• Foreign Exposure. Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile. Foreign exchange rates also can be extremely volatile.

• Prepayment. The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. Lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds) and certain types of other securities involve greater risk of default or price changes due to changes in the credit quality of the issuer. The value of lower-quality debt securities and certain types of other securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments.

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. You could lose money by investing in the fund.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could 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 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 and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit institutional.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

institutional.fidelity.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

rr_BarChartHeading

Year-by-Year Returns

Calendar Years

Bar Chart Narrative [Text Block]

rr_BarChartNarrativeTextBlock

The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown.

Bar Chart Does Not Reflect Sales Loads [Text]

rr_BarChartDoesNotReflectSalesLoads

The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown.

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the periods shown in the chart for Class A:	Returns	Quarter ended
Highest Quarter Return	20.68%	June 30, 2009
Lowest Quarter Return	-20.98%	December 31, 2008
Year-to-Date Return	16.05%	September 30, 2017

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Returns

Performance Table Does Reflect Sales Loads

rr_PerformanceTableDoesReflectSalesLoads

Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges.

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

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

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table One Class of after Tax Shown [Text]

rr_PerformanceTableOneClassOfAfterTaxShown

After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary.

Performance Table Explanation after Tax Higher

rr_PerformanceTableExplanationAfterTaxHigher

Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges. After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.

For the periods ended December 31, 2016

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 85% | Fidelity Asset Manager 85%-Class A

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) on purchases (as a % of offering price)

rr_MaximumCumulativeSalesChargeOverOfferingPrice

5.75%

Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds)

rr_MaximumDeferredSalesChargeOverOther

none

^[1]

Management fee

rr_ManagementFeesOverAssets

0.55%

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

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other expenses

rr_OtherExpensesOverAssets

0.24%

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.02%

Total annual operating expenses

rr_ExpensesOverAssets

1.06%

^[2]

Expenses Deferred Charges [Text Block]

rr_ExpensesDeferredChargesTextBlock

Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

1 year

rr_ExpenseExampleYear01

$ 677

3 years

rr_ExpenseExampleYear03

893

5 years

rr_ExpenseExampleYear05

1,126

10 years

rr_ExpenseExampleYear10

1,795

1 Year

rr_ExpenseExampleNoRedemptionYear01

677

3 Years

rr_ExpenseExampleNoRedemptionYear03

893

5 Years

rr_ExpenseExampleNoRedemptionYear05

1,126

10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 1,795

2007

rr_AnnualReturn2007

7.69%

2008

rr_AnnualReturn2008

(38.73%)

2009

rr_AnnualReturn2009

38.42%

2010

rr_AnnualReturn2010

16.20%

2011

rr_AnnualReturn2011

(6.31%)

2012

rr_AnnualReturn2012

15.57%

2013

rr_AnnualReturn2013

24.87%

2014

rr_AnnualReturn2014

5.58%

2015

rr_AnnualReturn2015

(0.95%)

2016

rr_AnnualReturn2016

7.13%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Sep. 30, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

16.05%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

20.68%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(20.98%)

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 85% | Fidelity Asset Manager 85%-Class M

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) on purchases (as a % of offering price)

rr_MaximumCumulativeSalesChargeOverOfferingPrice

3.50%

Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds)

rr_MaximumDeferredSalesChargeOverOther

none

^[1]

Management fee

rr_ManagementFeesOverAssets

0.55%

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

rr_DistributionAndService12b1FeesOverAssets

0.50%

Other expenses

rr_OtherExpensesOverAssets

0.26%

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.02%

Total annual operating expenses

rr_ExpensesOverAssets

1.33%

^[2]

Expenses Deferred Charges [Text Block]

rr_ExpensesDeferredChargesTextBlock

Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

1 year

rr_ExpenseExampleYear01

$ 481

3 years

rr_ExpenseExampleYear03

757

5 years

rr_ExpenseExampleYear05

1,053

10 years

rr_ExpenseExampleYear10

1,895

1 Year

rr_ExpenseExampleNoRedemptionYear01

481

3 Years

rr_ExpenseExampleNoRedemptionYear03

757

5 Years

rr_ExpenseExampleNoRedemptionYear05

1,053

10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 1,895

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 85% | Fidelity Asset Manager 85%-Class C

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) on purchases (as a % of offering price)

rr_MaximumCumulativeSalesChargeOverOfferingPrice

none

Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds)

rr_MaximumDeferredSalesChargeOverOther

1.00%

^[3]

Management fee

rr_ManagementFeesOverAssets

0.55%

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

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other expenses

rr_OtherExpensesOverAssets

0.24%

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.02%

Total annual operating expenses

rr_ExpensesOverAssets

1.81%

^[2]

Expenses Deferred Charges [Text Block]

rr_ExpensesDeferredChargesTextBlock

On Class C shares redeemed less than one year after purchase.

1 year

rr_ExpenseExampleYear01

$ 284

3 years

rr_ExpenseExampleYear03

569

5 years

rr_ExpenseExampleYear05

980

10 years

rr_ExpenseExampleYear10

2,127

1 Year

rr_ExpenseExampleNoRedemptionYear01

184

3 Years

rr_ExpenseExampleNoRedemptionYear03

569

5 Years

rr_ExpenseExampleNoRedemptionYear05

980

10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 2,127

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 85% | Fidelity Asset Manager 85%-Class I

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) on purchases (as a % of offering price)

rr_MaximumCumulativeSalesChargeOverOfferingPrice

none

Maximum contingent deferred sales charge (as a % of the lesser of original purchase price or redemption proceeds)

rr_MaximumDeferredSalesChargeOverOther

none

Management fee

rr_ManagementFeesOverAssets

0.55%

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

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.21%

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.02%

Total annual operating expenses

rr_ExpensesOverAssets

0.78%

^[2]

1 year

rr_ExpenseExampleYear01

$ 80

3 years

rr_ExpenseExampleYear03

249

5 years

rr_ExpenseExampleYear05

433

10 years

rr_ExpenseExampleYear10

966

1 Year

rr_ExpenseExampleNoRedemptionYear01

80

3 Years

rr_ExpenseExampleNoRedemptionYear03

249

5 Years

rr_ExpenseExampleNoRedemptionYear05

433

10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 966

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 85% | Return Before Taxes | Fidelity Asset Manager 85%-Class A

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 85%

Label

rr_AverageAnnualReturnLabel

Class A - Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

0.97%

Past 5 years

rr_AverageAnnualReturnYear05

8.79%

Past 10 years

rr_AverageAnnualReturnYear10

4.24%

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 85% | Return Before Taxes | Fidelity Asset Manager 85%-Class M

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 85%

Label

rr_AverageAnnualReturnLabel

Class M - Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

3.05%

Past 5 years

rr_AverageAnnualReturnYear05

8.99%

Past 10 years

rr_AverageAnnualReturnYear10

4.19%

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 85% | Return Before Taxes | Fidelity Asset Manager 85%-Class C

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 85%

Label

rr_AverageAnnualReturnLabel

Class C - Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

5.32%

Past 5 years

rr_AverageAnnualReturnYear05

9.26%

Past 10 years

rr_AverageAnnualReturnYear10

4.05%

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 85% | Return Before Taxes | Fidelity Asset Manager 85%-Class I

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 85%

Label

rr_AverageAnnualReturnLabel

Class I - Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

7.39%

Past 5 years

rr_AverageAnnualReturnYear05

10.39%

Past 10 years

rr_AverageAnnualReturnYear10

5.17%

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 85% | After Taxes on Distributions | Fidelity Asset Manager 85%-Class A

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 85%

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Past 1 year

rr_AverageAnnualReturnYear01

0.72%

Past 5 years

rr_AverageAnnualReturnYear05

7.74%

Past 10 years

rr_AverageAnnualReturnYear10

3.59%

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 85% | After Taxes on Distributions and Sales | Fidelity Asset Manager 85%-Class A

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 85%

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Past 1 year

rr_AverageAnnualReturnYear01

0.75%

Past 5 years

rr_AverageAnnualReturnYear05

6.80%

Past 10 years

rr_AverageAnnualReturnYear10

3.26%

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 85% | S&P 500® Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

11.96%

Past 5 years

rr_AverageAnnualReturnYear05

14.66%

Past 10 years

rr_AverageAnnualReturnYear10

6.95%

09.30 Fidelity Asset Manager Funds AMCI Combo PRO-07 | Fidelity Asset Manager® 85% | Fidelity Asset Manager 85% Composite Index℠(reflects no deduction for fees or expenses)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

9.22%

Past 5 years

rr_AverageAnnualReturnYear05

10.92%

Past 10 years

rr_AverageAnnualReturnYear10

5.42%

[1] Class A and Class M purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A and Class M purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00% or 0.25%, respectively.

[2] Differs from the ratios of expenses to average net assets in the Financial Highlights section of the prospectus because of acquired fund fees and expenses.

[3] On Class C shares redeemed less than one year after purchase.

XML

09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 | Fidelity Asset Manager® 20%

Fund Summary

Fund/Class:
Fidelity Asset Manager® 20%/Fidelity Asset Manager® 20%

Investment Objective

The fund seeks a high level of current income by allocating its assets among stocks, bonds, short-term instruments and other investments. The fund also considers the potential for capital appreciation.

Fee Table

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder fees

Shareholder Fees {- Fidelity Asset Manager® 20%}	09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 Fidelity Asset Manager® 20% USD ($)
(fees paid directly from your investment)	none

Annual Operating Expenses

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

Annual Operating Expenses {- Fidelity Asset Manager® 20%}	09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 Fidelity Asset Manager® 20% Fidelity Asset Manager 20%-Retail Class
Management fee	0.41%
Distribution and/or Service (12b-1) fees	none
Other expenses	0.11%
Acquired fund fees and expenses	0.01%
Total annual operating expenses	0.53%	[1]

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

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:

Sell All Shares

Expense Example {- Fidelity Asset Manager® 20%}	09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 Fidelity Asset Manager® 20% Fidelity Asset Manager 20%-Retail Class USD ($)
1 year	$ 54
3 years	170
5 years	296
10 years	$ 665

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 operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 22% of the average value of its portfolio.

Principal Investment Strategies

• Allocating the fund's assets among three main asset classes: the stock class (equity securities of all types), the bond class (fixed-income securities of all types maturing in more than one year, including lower-quality debt securities which are sometimes referred to as high yield debt securities or junk bonds), and the short-term/money market class (fixed-income securities of all types maturing in one year or less).

• Maintaining a neutral mix over time of 20% of assets in stocks, 50% of assets in bonds, and 30% of assets in short-term and money market instruments.

• Adjusting allocation among asset classes gradually within the following ranges: stock class (10%-30%), bond class (40%-60%), and short-term/money market class (10%-50%).

• Investing in domestic and foreign issuers.

• Investing in Fidelity's central funds (specialized investment vehicles used by Fidelity^® funds to invest in particular security types or investment disciplines).

Principal Investment Risks

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.

• Foreign Exposure. Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile. Foreign exchange rates also can be extremely volatile.

• Prepayment. The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. 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 security to decrease. Lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds) and certain types of other securities involve greater risk of default or price changes due to changes in the credit quality of the issuer. The value of lower-quality debt securities and certain types of other securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments.

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. You could lose money by investing in the fund.

Performance

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 and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Year-by-Year Returns

Calendar Years

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	8.80%	June 30, 2009
Lowest Quarter Return	-7.78%	December 31, 2008
Year-to-Date Return	5.32%	September 30, 2017

Average Annual Returns

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

Average Annual Total Returns{- Fidelity Asset Manager® 20%} - 09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 - Fidelity Asset Manager® 20%	Past 1 year	Past 5 years	Past 10 years
Fidelity Asset Manager 20%-Retail Class | Return Before Taxes	4.70%	4.07%	3.90%
Fidelity Asset Manager 20%-Retail Class | After Taxes on Distributions	3.83%	2.89%	2.74%
Fidelity Asset Manager 20%-Retail Class | After Taxes on Distributions and Sales	2.77%	2.80%	2.67%
Bloomberg Barclays U.S. Aggregate Bond Index(reflects no deduction for fees, expenses, or taxes)	2.65%	2.23%	4.34%
Fidelity Asset Manager 20% Composite Index℠(reflects no deduction for fees or expenses)	3.54%	3.66%	3.70%

[1] Differs from the ratios of expenses to average net assets in the Financial Highlights section of the prospectus because of acquired fund fees and expenses.

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY CHARLES STREET TRUST

Prospectus Date

rr_ProspectusDate

Nov. 29, 2017

09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 | Fidelity Asset Manager® 20%

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund/Class:
Fidelity Asset Manager® 20%/Fidelity Asset Manager® 20%

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks a high level of current income by allocating its assets among stocks, bonds, short-term instruments and other investments. The fund also considers the potential for capital appreciation.

Expense [Heading]

rr_ExpenseHeading

Fee Table

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder fees

(fees paid directly from your investment)

rr_ShareholderFeeOther

none

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Operating Expenses

(expenses that you pay each year as a % 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 operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 22% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

22.00%

Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text]

rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees

Differs from the ratios of expenses to average net assets in the Financial Highlights section of the prospectus because of acquired fund fees and expenses.

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

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:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Sell All Shares

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

• Allocating the fund's assets among three main asset classes: the stock class (equity securities of all types), the bond class (fixed-income securities of all types maturing in more than one year, including lower-quality debt securities which are sometimes referred to as high yield debt securities or junk bonds), and the short-term/money market class (fixed-income securities of all types maturing in one year or less).

• Maintaining a neutral mix over time of 20% of assets in stocks, 50% of assets in bonds, and 30% of assets in short-term and money market instruments.

• Adjusting allocation among asset classes gradually within the following ranges: stock class (10%-30%), bond class (40%-60%), and short-term/money market class (10%-50%).

• Investing in domestic and foreign issuers.

• Investing in Fidelity's central funds (specialized investment vehicles used by Fidelity^® funds to invest in particular security types or investment disciplines).

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.

• Foreign Exposure. Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile. Foreign exchange rates also can be extremely volatile.

• Prepayment. The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. 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 security to decrease. Lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds) and certain types of other securities involve greater risk of default or price changes due to changes in the credit quality of the issuer. The value of lower-quality debt securities and certain types of other securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments.

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. You could lose money by investing in the fund.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could 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 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 and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.fidelity.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

rr_BarChartHeading

Year-by-Year Returns

Calendar Years

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	8.80%	June 30, 2009
Lowest Quarter Return	-7.78%	December 31, 2008
Year-to-Date Return	5.32%	September 30, 2017

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Returns

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

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

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 | Fidelity Asset Manager® 20% | Fidelity Asset Manager 20%-Retail Class

Risk/Return:

rr_RiskReturnAbstract

Management fee

rr_ManagementFeesOverAssets

0.41%

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

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.11%

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.01%

Total annual operating expenses

rr_ExpensesOverAssets

0.53%

^[1]

1 year

rr_ExpenseExampleYear01

$ 54

3 years

rr_ExpenseExampleYear03

170

5 years

rr_ExpenseExampleYear05

296

10 years

rr_ExpenseExampleYear10

$ 665

2007

rr_AnnualReturn2007

4.77%

2008

rr_AnnualReturn2008

(14.17%)

2009

rr_AnnualReturn2009

19.50%

2010

rr_AnnualReturn2010

8.92%

2011

rr_AnnualReturn2011

2.63%

2012

rr_AnnualReturn2012

6.83%

2013

rr_AnnualReturn2013

5.16%

2014

rr_AnnualReturn2014

4.11%

2015

rr_AnnualReturn2015

(0.30%)

2016

rr_AnnualReturn2016

4.70%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Sep. 30, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

5.32%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

8.80%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(7.78%)

09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 | Fidelity Asset Manager® 20% | Return Before Taxes | Fidelity Asset Manager 20%-Retail Class

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 20%

Label

rr_AverageAnnualReturnLabel

Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

4.70%

Past 5 years

rr_AverageAnnualReturnYear05

4.07%

Past 10 years

rr_AverageAnnualReturnYear10

3.90%

09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 | Fidelity Asset Manager® 20% | After Taxes on Distributions | Fidelity Asset Manager 20%-Retail Class

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 20%

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Past 1 year

rr_AverageAnnualReturnYear01

3.83%

Past 5 years

rr_AverageAnnualReturnYear05

2.89%

Past 10 years

rr_AverageAnnualReturnYear10

2.74%

09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 | Fidelity Asset Manager® 20% | After Taxes on Distributions and Sales | Fidelity Asset Manager 20%-Retail Class

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 20%

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Past 1 year

rr_AverageAnnualReturnYear01

2.77%

Past 5 years

rr_AverageAnnualReturnYear05

2.80%

Past 10 years

rr_AverageAnnualReturnYear10

2.67%

09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 | Fidelity Asset Manager® 20% | Bloomberg Barclays U.S. Aggregate Bond Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

2.65%

Past 5 years

rr_AverageAnnualReturnYear05

2.23%

Past 10 years

rr_AverageAnnualReturnYear10

4.34%

09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 | Fidelity Asset Manager® 20% | Fidelity Asset Manager 20% Composite Index℠(reflects no deduction for fees or expenses)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

3.54%

Past 5 years

rr_AverageAnnualReturnYear05

3.66%

Past 10 years

rr_AverageAnnualReturnYear10

3.70%

[1] Differs from the ratios of expenses to average net assets in the Financial Highlights section of the prospectus because of acquired fund fees and expenses.

XML

09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 | Fidelity Asset Manager® 30%

Fund Summary

Fund/Class:
Fidelity Asset Manager® 30%/Fidelity Asset Manager® 30%

Investment Objective

The fund seeks a high level of current income by allocating its assets among stocks, bonds, short-term instruments and other investments. The fund also considers the potential for capital appreciation.

Fee Table

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder fees

Shareholder Fees {- Fidelity Asset Manager® 30%}	09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 Fidelity Asset Manager® 30% USD ($)
(fees paid directly from your investment)	none

Annual Operating Expenses

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

Annual Operating Expenses {- Fidelity Asset Manager® 30%}	09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 Fidelity Asset Manager® 30% Fidelity Asset Manager 30%-Retail Class
Management fee	0.41%
Distribution and/or Service (12b-1) fees	none
Other expenses	0.13%
Acquired fund fees and expenses	0.01%
Total annual operating expenses	0.55%	[1]

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

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:

Sell All Shares

Expense Example {- Fidelity Asset Manager® 30%}	09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 Fidelity Asset Manager® 30% Fidelity Asset Manager 30%-Retail Class USD ($)
1 year	$ 56
3 years	176
5 years	307
10 years	$ 689

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 operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 24% of the average value of its portfolio.

Principal Investment Strategies

• Allocating the fund's assets among three main asset classes: the stock class (equity securities of all types), the bond class (fixed-income securities of all types maturing in more than one year, including lower-quality debt securities which are sometimes referred to as high yield debt securities or junk bonds), and the short-term/money market class (fixed-income securities of all types maturing in one year or less).

• Maintaining a neutral mix over time of 30% of assets in stocks, 50% of assets in bonds, and 20% of assets in short-term and money market instruments.

• Adjusting allocation among asset classes gradually within the following ranges: stock class (20%-40%), bond class (40%-60%), and short-term/money market class (0%-50%).

• Investing in domestic and foreign issuers.

• Investing in Fidelity's central funds (specialized investment vehicles used by Fidelity^® funds to invest in particular security types or investment disciplines).

Principal Investment Risks

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.

• Foreign Exposure. Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile. Foreign exchange rates also can be extremely volatile.

• Prepayment. The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. 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 security to decrease. Lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds) and certain types of other securities involve greater risk of default or price changes due to changes in the credit quality of the issuer. The value of lower-quality debt securities and certain types of other securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments.

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. You could lose money by investing in the fund.

Performance

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 and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Year-by-Year Returns

Calendar Years

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	10.91%	June 30, 2009
Lowest Quarter Return	-10.59%	December 31, 2008
Year-to-Date Return	7.22%	September 30, 2017

Average Annual Returns

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

Average Annual Total Returns{- Fidelity Asset Manager® 30%} - 09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 - Fidelity Asset Manager® 30%	Past 1 year	Past 5 years	Since Inception	[1]	Inception Date
Fidelity Asset Manager 30%-Retail Class					Oct. 09, 2007
Fidelity Asset Manager 30%-Retail Class | Return Before Taxes	5.50%	5.29%	3.93%
Fidelity Asset Manager 30%-Retail Class | After Taxes on Distributions	4.70%	4.20%	2.85%		Oct. 09, 2007
Fidelity Asset Manager 30%-Retail Class | After Taxes on Distributions and Sales	3.19%	3.79%	2.72%		Oct. 09, 2007
Bloomberg Barclays U.S. Aggregate Bond Index(reflects no deduction for fees, expenses, or taxes)	2.65%	2.23%	4.29%
Fidelity Asset Manager 30% Composite Index℠(reflects no deduction for fees or expenses)	4.56%	4.89%	3.87%

[1] Differs from the ratios of expenses to average net assets in the Financial Highlights section of the prospectus because of acquired fund fees and expenses.

[1] From October 9, 2007

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY CHARLES STREET TRUST

Prospectus Date

rr_ProspectusDate

Nov. 29, 2017

09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 | Fidelity Asset Manager® 30%

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund/Class:
Fidelity Asset Manager® 30%/Fidelity Asset Manager® 30%

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks a high level of current income by allocating its assets among stocks, bonds, short-term instruments and other investments. The fund also considers the potential for capital appreciation.

Expense [Heading]

rr_ExpenseHeading

Fee Table

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder fees

(fees paid directly from your investment)

rr_ShareholderFeeOther

none

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Operating Expenses

(expenses that you pay each year as a % 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 operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 24% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

24.00%

Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text]

rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees

Differs from the ratios of expenses to average net assets in the Financial Highlights section of the prospectus because of acquired fund fees and expenses.

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

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:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Sell All Shares

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

• Allocating the fund's assets among three main asset classes: the stock class (equity securities of all types), the bond class (fixed-income securities of all types maturing in more than one year, including lower-quality debt securities which are sometimes referred to as high yield debt securities or junk bonds), and the short-term/money market class (fixed-income securities of all types maturing in one year or less).

• Maintaining a neutral mix over time of 30% of assets in stocks, 50% of assets in bonds, and 20% of assets in short-term and money market instruments.

• Adjusting allocation among asset classes gradually within the following ranges: stock class (20%-40%), bond class (40%-60%), and short-term/money market class (0%-50%).

• Investing in domestic and foreign issuers.

• Investing in Fidelity's central funds (specialized investment vehicles used by Fidelity^® funds to invest in particular security types or investment disciplines).

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.

• Foreign Exposure. Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile. Foreign exchange rates also can be extremely volatile.

• Prepayment. The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. 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 security to decrease. Lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds) and certain types of other securities involve greater risk of default or price changes due to changes in the credit quality of the issuer. The value of lower-quality debt securities and certain types of other securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments.

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. You could lose money by investing in the fund.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could 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 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 and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.fidelity.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

rr_BarChartHeading

Year-by-Year Returns

Calendar Years

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	10.91%	June 30, 2009
Lowest Quarter Return	-10.59%	December 31, 2008
Year-to-Date Return	7.22%	September 30, 2017

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Returns

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

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

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 | Fidelity Asset Manager® 30% | Fidelity Asset Manager 30%-Retail Class

Risk/Return:

rr_RiskReturnAbstract

Management fee

rr_ManagementFeesOverAssets

0.41%

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

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.13%

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.01%

Total annual operating expenses

rr_ExpensesOverAssets

0.55%

^[1]

1 year

rr_ExpenseExampleYear01

$ 56

3 years

rr_ExpenseExampleYear03

176

5 years

rr_ExpenseExampleYear05

307

10 years

rr_ExpenseExampleYear10

$ 689

2008

rr_AnnualReturn2008

(19.69%)

2009

rr_AnnualReturn2009

23.62%

2010

rr_AnnualReturn2010

10.89%

2011

rr_AnnualReturn2011

1.69%

2012

rr_AnnualReturn2012

8.69%

2013

rr_AnnualReturn2013

7.94%

2014

rr_AnnualReturn2014

4.83%

2015

rr_AnnualReturn2015

(0.29%)

2016

rr_AnnualReturn2016

5.50%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Sep. 30, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

7.22%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

10.91%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(10.59%)

Inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 09, 2007

09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 | Fidelity Asset Manager® 30% | Return Before Taxes | Fidelity Asset Manager 30%-Retail Class

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 30%

Label

rr_AverageAnnualReturnLabel

Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

5.50%

Past 5 years

rr_AverageAnnualReturnYear05

5.29%

Since Inception

rr_AverageAnnualReturnSinceInception

3.93%

^[2]

09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 | Fidelity Asset Manager® 30% | After Taxes on Distributions | Fidelity Asset Manager 30%-Retail Class

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 30%

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Past 1 year

rr_AverageAnnualReturnYear01

4.70%

Past 5 years

rr_AverageAnnualReturnYear05

4.20%

Since Inception

rr_AverageAnnualReturnSinceInception

2.85%

^[2]

Inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 09, 2007

09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 | Fidelity Asset Manager® 30% | After Taxes on Distributions and Sales | Fidelity Asset Manager 30%-Retail Class

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 30%

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Past 1 year

rr_AverageAnnualReturnYear01

3.19%

Past 5 years

rr_AverageAnnualReturnYear05

3.79%

Since Inception

rr_AverageAnnualReturnSinceInception

2.72%

^[2]

Inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 09, 2007

09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 | Fidelity Asset Manager® 30% | Bloomberg Barclays U.S. Aggregate Bond Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

2.65%

Past 5 years

rr_AverageAnnualReturnYear05

2.23%

Since Inception

rr_AverageAnnualReturnSinceInception

4.29%

^[2]

09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 | Fidelity Asset Manager® 30% | Fidelity Asset Manager 30% Composite Index℠(reflects no deduction for fees or expenses)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

4.56%

Past 5 years

rr_AverageAnnualReturnYear05

4.89%

Since Inception

rr_AverageAnnualReturnSinceInception

3.87%

^[2]

[1] Differs from the ratios of expenses to average net assets in the Financial Highlights section of the prospectus because of acquired fund fees and expenses.

[2] From October 9, 2007

XML

09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 | Fidelity Asset Manager® 40%

Fund Summary

Fund/Class:
Fidelity Asset Manager® 40%/Fidelity Asset Manager® 40%

Investment Objective

The fund seeks current income as well as total return with reduced risk over the long term by allocating its assets among stocks, bonds, and short-term instruments. The fund also considers the potential for capital appreciation.

Fee Table

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder fees

Shareholder Fees {- Fidelity Asset Manager® 40%}	09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 Fidelity Asset Manager® 40% USD ($)
(fees paid directly from your investment)	none

Annual Operating Expenses

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

Annual Operating Expenses {- Fidelity Asset Manager® 40%}	09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 Fidelity Asset Manager® 40% Fidelity Asset Manager 40%-Retail Class
Management fee	0.41%
Distribution and/or Service (12b-1) fees	none
Other expenses	0.13%
Acquired fund fees and expenses	0.02%
Total annual operating expenses	0.56%	[1]

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

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:

Sell All Shares

Expense Example {- Fidelity Asset Manager® 40%}	09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 Fidelity Asset Manager® 40% Fidelity Asset Manager 40%-Retail Class USD ($)
1 year	$ 57
3 years	179
5 years	313
10 years	$ 701

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 operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 20% of the average value of its portfolio.

Principal Investment Strategies

• Allocating the fund's assets among three main asset classes: the stock class (equity securities of all types), the bond class (fixed-income securities of all types maturing in more than one year, including lower-quality debt securities which are sometimes referred to as high yield debt securities or junk bonds), and the short-term/money market class (fixed-income securities of all types maturing in one year or less).

• Maintaining a neutral mix over time of 40% of assets in stocks, 45% of assets in bonds, and 15% of assets in short-term and money market instruments.

• Adjusting allocation among asset classes gradually within the following ranges: stock class (20%-60%), bond class (30%-60%), and short-term/money market class (0%-50%).

• Investing in domestic and foreign issuers.

• Investing in Fidelity's central funds (specialized investment vehicles used by Fidelity^® funds to invest in particular security types or investment disciplines).

Principal Investment Risks

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.

• Foreign Exposure. Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile. Foreign exchange rates also can be extremely volatile.

• Prepayment. The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. Lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds) and certain types of other securities involve greater risk of default or price changes due to changes in the credit quality of the issuer. The value of lower-quality debt securities and certain types of other securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments.

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. You could lose money by investing in the fund.

Performance

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 and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Year-by-Year Returns

Calendar Years

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	12.87%	June 30, 2009
Lowest Quarter Return	-12.42%	December 31, 2008
Year-to-Date Return	8.89%	September 30, 2017

Average Annual Returns

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

Average Annual Total Returns{- Fidelity Asset Manager® 40%} - 09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 - Fidelity Asset Manager® 40%	Past 1 year	Past 5 years	Since Inception	[1]	Inception Date
Fidelity Asset Manager 40%-Retail Class					Oct. 09, 2007
Fidelity Asset Manager 40%-Retail Class | Return Before Taxes	6.00%	6.35%	4.12%
Fidelity Asset Manager 40%-Retail Class | After Taxes on Distributions	5.26%	5.29%	3.12%		Oct. 09, 2007
Fidelity Asset Manager 40%-Retail Class | After Taxes on Distributions and Sales	3.50%	4.66%	2.91%		Oct. 09, 2007
Bloomberg Barclays U.S. Aggregate Bond Index(reflects no deduction for fees, expenses, or taxes)	2.65%	2.23%	4.29%
Fidelity Asset Manager 40% Composite Index℠(reflects no deduction for fees or expenses)	5.45%	6.02%	4.13%

[1] Differs from the ratios of expenses to average net assets in the Financial Highlights section of the prospectus because of acquired fund fees and expenses.

[1] From October 9, 2007

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY CHARLES STREET TRUST

Prospectus Date

rr_ProspectusDate

Nov. 29, 2017

09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 | Fidelity Asset Manager® 40%

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund/Class:
Fidelity Asset Manager® 40%/Fidelity Asset Manager® 40%

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks current income as well as total return with reduced risk over the long term by allocating its assets among stocks, bonds, and short-term instruments. The fund also considers the potential for capital appreciation.

Expense [Heading]

rr_ExpenseHeading

Fee Table

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder fees

(fees paid directly from your investment)

rr_ShareholderFeeOther

none

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Operating Expenses

(expenses that you pay each year as a % 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 operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 20% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

20.00%

Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text]

rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees

Differs from the ratios of expenses to average net assets in the Financial Highlights section of the prospectus because of acquired fund fees and expenses.

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

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:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Sell All Shares

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

• Allocating the fund's assets among three main asset classes: the stock class (equity securities of all types), the bond class (fixed-income securities of all types maturing in more than one year, including lower-quality debt securities which are sometimes referred to as high yield debt securities or junk bonds), and the short-term/money market class (fixed-income securities of all types maturing in one year or less).

• Maintaining a neutral mix over time of 40% of assets in stocks, 45% of assets in bonds, and 15% of assets in short-term and money market instruments.

• Adjusting allocation among asset classes gradually within the following ranges: stock class (20%-60%), bond class (30%-60%), and short-term/money market class (0%-50%).

• Investing in domestic and foreign issuers.

• Investing in Fidelity's central funds (specialized investment vehicles used by Fidelity^® funds to invest in particular security types or investment disciplines).

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.

• Foreign Exposure. Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile. Foreign exchange rates also can be extremely volatile.

• Prepayment. The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. Lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds) and certain types of other securities involve greater risk of default or price changes due to changes in the credit quality of the issuer. The value of lower-quality debt securities and certain types of other securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments.

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. You could lose money by investing in the fund.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could 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 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 and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.fidelity.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

rr_BarChartHeading

Year-by-Year Returns

Calendar Years

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	12.87%	June 30, 2009
Lowest Quarter Return	-12.42%	December 31, 2008
Year-to-Date Return	8.89%	September 30, 2017

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Returns

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

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

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 | Fidelity Asset Manager® 40% | Fidelity Asset Manager 40%-Retail Class

Risk/Return:

rr_RiskReturnAbstract

Management fee

rr_ManagementFeesOverAssets

0.41%

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

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.13%

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.02%

Total annual operating expenses

rr_ExpensesOverAssets

0.56%

^[1]

1 year

rr_ExpenseExampleYear01

$ 57

3 years

rr_ExpenseExampleYear03

179

5 years

rr_ExpenseExampleYear05

313

10 years

rr_ExpenseExampleYear10

$ 701

2008

rr_AnnualReturn2008

(23.20%)

2009

rr_AnnualReturn2009

25.95%

2010

rr_AnnualReturn2010

12.14%

2011

rr_AnnualReturn2011

0.49%

2012

rr_AnnualReturn2012

10.23%

2013

rr_AnnualReturn2013

11.09%

2014

rr_AnnualReturn2014

5.13%

2015

rr_AnnualReturn2015

(0.29%)

2016

rr_AnnualReturn2016

6.00%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Sep. 30, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

8.89%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

12.87%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(12.42%)

Inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 09, 2007

09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 | Fidelity Asset Manager® 40% | Return Before Taxes | Fidelity Asset Manager 40%-Retail Class

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 40%

Label

rr_AverageAnnualReturnLabel

Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

6.00%

Past 5 years

rr_AverageAnnualReturnYear05

6.35%

Since Inception

rr_AverageAnnualReturnSinceInception

4.12%

^[2]

09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 | Fidelity Asset Manager® 40% | After Taxes on Distributions | Fidelity Asset Manager 40%-Retail Class

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 40%

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Past 1 year

rr_AverageAnnualReturnYear01

5.26%

Past 5 years

rr_AverageAnnualReturnYear05

5.29%

Since Inception

rr_AverageAnnualReturnSinceInception

3.12%

^[2]

Inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 09, 2007

09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 | Fidelity Asset Manager® 40% | After Taxes on Distributions and Sales | Fidelity Asset Manager 40%-Retail Class

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 40%

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Past 1 year

rr_AverageAnnualReturnYear01

3.50%

Past 5 years

rr_AverageAnnualReturnYear05

4.66%

Since Inception

rr_AverageAnnualReturnSinceInception

2.91%

^[2]

Inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 09, 2007

09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 | Fidelity Asset Manager® 40% | Bloomberg Barclays U.S. Aggregate Bond Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

2.65%

Past 5 years

rr_AverageAnnualReturnYear05

2.23%

Since Inception

rr_AverageAnnualReturnSinceInception

4.29%

^[2]

09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 | Fidelity Asset Manager® 40% | Fidelity Asset Manager 40% Composite Index℠(reflects no deduction for fees or expenses)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

5.45%

Past 5 years

rr_AverageAnnualReturnYear05

6.02%

Since Inception

rr_AverageAnnualReturnSinceInception

4.13%

^[2]

[1] Differs from the ratios of expenses to average net assets in the Financial Highlights section of the prospectus because of acquired fund fees and expenses.

[2] From October 9, 2007

XML

09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 | Fidelity Asset Manager® 50%

Fund Summary

Fund/Class:
Fidelity Asset Manager® 50%/Fidelity Asset Manager® 50%

Investment Objective

The fund seeks high total return with reduced risk over the long term by allocating its assets among stocks, bonds, and short-term instruments.

Fee Table

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder fees

Shareholder Fees {- Fidelity Asset Manager® 50%}	09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 Fidelity Asset Manager® 50% USD ($)
(fees paid directly from your investment)	none

Annual Operating Expenses

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

Annual Operating Expenses {- Fidelity Asset Manager® 50%}	09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 Fidelity Asset Manager® 50% Fidelity Asset Manager 50%-Retail Class
Management fee	0.50%
Distribution and/or Service (12b-1) fees	none
Other expenses	0.15%
Acquired fund fees and expenses	0.02%
Total annual operating expenses	0.67%	[1]

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

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:

Sell All Shares

Expense Example {- Fidelity Asset Manager® 50%}	09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 Fidelity Asset Manager® 50% Fidelity Asset Manager 50%-Retail Class USD ($)
1 year	$ 68
3 years	214
5 years	373
10 years	$ 835

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 operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 20% of the average value of its portfolio.

Principal Investment Strategies

• Allocating the fund's assets among three main asset classes: the stock class (equity securities of all types), the bond class (fixed-income securities of all types maturing in more than one year, including lower-quality debt securities which are sometimes referred to as high yield debt securities or junk bonds), and the short-term/money market class (fixed-income securities of all types maturing in one year or less).

• Maintaining a neutral mix over time of 50% of assets in stocks, 40% of assets in bonds, and 10% of assets in short-term and money market instruments.

• Adjusting allocation among asset classes gradually within the following ranges: stock class (30%-70%), bond class (20%-60%), and short-term/money market class (0%-50%).

• Investing in domestic and foreign issuers.

• Investing in Fidelity's central funds (specialized investment vehicles used by Fidelity^® funds to invest in particular security types or investment disciplines).

Principal Investment Risks

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.

• Foreign Exposure. Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile. Foreign exchange rates also can be extremely volatile.

• Prepayment. The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. Lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds) and certain types of other securities involve greater risk of default or price changes due to changes in the credit quality of the issuer. The value of lower-quality debt securities and certain types of other securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments.

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. You could lose money by investing in the fund.

Performance

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 and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Year-by-Year Returns

Calendar Years

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	15.23%	June 30, 2009
Lowest Quarter Return	-14.74%	December 31, 2008
Year-to-Date Return	10.57%	September 30, 2017

Average Annual Returns

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

Average Annual Total Returns{- Fidelity Asset Manager® 50%} - 09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 - Fidelity Asset Manager® 50%	Past 1 year	Past 5 years	Past 10 years
Fidelity Asset Manager 50%-Retail Class | Return Before Taxes	6.43%	7.24%	4.87%
Fidelity Asset Manager 50%-Retail Class | After Taxes on Distributions	5.68%	5.74%	3.54%
Fidelity Asset Manager 50%-Retail Class | After Taxes on Distributions and Sales	3.83%	5.30%	3.44%
S&P 500® Index(reflects no deduction for fees, expenses, or taxes)	11.96%	14.66%	6.95%
Fidelity Asset Manager 50% Composite Index℠(reflects no deduction for fees or expenses)	6.33%	7.14%	4.83%

[1] Differs from the ratios of expenses to average net assets in the Financial Highlights section of the prospectus because of acquired fund fees and expenses.

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY CHARLES STREET TRUST

Prospectus Date

rr_ProspectusDate

Nov. 29, 2017

09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 | Fidelity Asset Manager® 50%

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund/Class:
Fidelity Asset Manager® 50%/Fidelity Asset Manager® 50%

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks high total return with reduced risk over the long term by allocating its assets among stocks, bonds, and short-term instruments.

Expense [Heading]

rr_ExpenseHeading

Fee Table

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder fees

(fees paid directly from your investment)

rr_ShareholderFeeOther

none

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Operating Expenses

(expenses that you pay each year as a % 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 operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 20% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

20.00%

Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text]

rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees

Differs from the ratios of expenses to average net assets in the Financial Highlights section of the prospectus because of acquired fund fees and expenses.

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

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:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Sell All Shares

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

• Allocating the fund's assets among three main asset classes: the stock class (equity securities of all types), the bond class (fixed-income securities of all types maturing in more than one year, including lower-quality debt securities which are sometimes referred to as high yield debt securities or junk bonds), and the short-term/money market class (fixed-income securities of all types maturing in one year or less).

• Maintaining a neutral mix over time of 50% of assets in stocks, 40% of assets in bonds, and 10% of assets in short-term and money market instruments.

• Adjusting allocation among asset classes gradually within the following ranges: stock class (30%-70%), bond class (20%-60%), and short-term/money market class (0%-50%).

• Investing in domestic and foreign issuers.

• Investing in Fidelity's central funds (specialized investment vehicles used by Fidelity^® funds to invest in particular security types or investment disciplines).

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.

• Foreign Exposure. Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile. Foreign exchange rates also can be extremely volatile.

• Prepayment. The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. Lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds) and certain types of other securities involve greater risk of default or price changes due to changes in the credit quality of the issuer. The value of lower-quality debt securities and certain types of other securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments.

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. You could lose money by investing in the fund.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could 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 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 and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.fidelity.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

rr_BarChartHeading

Year-by-Year Returns

Calendar Years

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	15.23%	June 30, 2009
Lowest Quarter Return	-14.74%	December 31, 2008
Year-to-Date Return	10.57%	September 30, 2017

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Returns

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

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

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 | Fidelity Asset Manager® 50% | Fidelity Asset Manager 50%-Retail Class

Risk/Return:

rr_RiskReturnAbstract

Management fee

rr_ManagementFeesOverAssets

0.50%

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

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.15%

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.02%

Total annual operating expenses

rr_ExpensesOverAssets

0.67%

^[1]

1 year

rr_ExpenseExampleYear01

$ 68

3 years

rr_ExpenseExampleYear03

214

5 years

rr_ExpenseExampleYear05

373

10 years

rr_ExpenseExampleYear10

$ 835

2007

rr_AnnualReturn2007

6.33%

2008

rr_AnnualReturn2008

(27.80%)

2009

rr_AnnualReturn2009

30.94%

2010

rr_AnnualReturn2010

13.51%

2011

rr_AnnualReturn2011

(0.65%)

2012

rr_AnnualReturn2012

11.37%

2013

rr_AnnualReturn2013

13.96%

2014

rr_AnnualReturn2014

5.48%

2015

rr_AnnualReturn2015

(0.44%)

2016

rr_AnnualReturn2016

6.43%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Sep. 30, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

10.57%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

15.23%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(14.74%)

09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 | Fidelity Asset Manager® 50% | Return Before Taxes | Fidelity Asset Manager 50%-Retail Class

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 50%

Label

rr_AverageAnnualReturnLabel

Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

6.43%

Past 5 years

rr_AverageAnnualReturnYear05

7.24%

Past 10 years

rr_AverageAnnualReturnYear10

4.87%

09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 | Fidelity Asset Manager® 50% | After Taxes on Distributions | Fidelity Asset Manager 50%-Retail Class

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 50%

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Past 1 year

rr_AverageAnnualReturnYear01

5.68%

Past 5 years

rr_AverageAnnualReturnYear05

5.74%

Past 10 years

rr_AverageAnnualReturnYear10

3.54%

09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 | Fidelity Asset Manager® 50% | After Taxes on Distributions and Sales | Fidelity Asset Manager 50%-Retail Class

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 50%

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Past 1 year

rr_AverageAnnualReturnYear01

3.83%

Past 5 years

rr_AverageAnnualReturnYear05

5.30%

Past 10 years

rr_AverageAnnualReturnYear10

3.44%

09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 | Fidelity Asset Manager® 50% | S&P 500® Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

11.96%

Past 5 years

rr_AverageAnnualReturnYear05

14.66%

Past 10 years

rr_AverageAnnualReturnYear10

6.95%

09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 | Fidelity Asset Manager® 50% | Fidelity Asset Manager 50% Composite Index℠(reflects no deduction for fees or expenses)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

6.33%

Past 5 years

rr_AverageAnnualReturnYear05

7.14%

Past 10 years

rr_AverageAnnualReturnYear10

4.83%

[1] Differs from the ratios of expenses to average net assets in the Financial Highlights section of the prospectus because of acquired fund fees and expenses.

XML

09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 | Fidelity Asset Manager® 60%

Fund Summary

Fund/Class:
Fidelity Asset Manager® 60%/Fidelity Asset Manager® 60%

Investment Objective

The fund seeks high total return over the long term by allocating its assets among stocks, bonds, short-term instruments, and other investments.

Fee Table

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder fees

Shareholder Fees {- Fidelity Asset Manager® 60%}	09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 Fidelity Asset Manager® 60% USD ($)
(fees paid directly from your investment)	none

Annual Operating Expenses

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

Annual Operating Expenses {- Fidelity Asset Manager® 60%}	09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 Fidelity Asset Manager® 60% Fidelity Asset Manager 60%-Retail Class
Management fee	0.55%
Distribution and/or Service (12b-1) fees	none
Other expenses	0.16%
Acquired fund fees and expenses	0.02%
Total annual operating expenses	0.73%	[1]

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

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:

Sell All Shares

Expense Example {- Fidelity Asset Manager® 60%}	09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 Fidelity Asset Manager® 60% Fidelity Asset Manager 60%-Retail Class USD ($)
1 year	$ 75
3 years	233
5 years	406
10 years	$ 906

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 operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 18% of the average value of its portfolio.

Principal Investment Strategies

• Allocating the fund's assets among three main asset classes: the stock class (equity securities of all types), the bond class (fixed-income securities of all types maturing in more than one year, including lower-quality debt securities which are sometimes referred to as high yield debt securities or junk bonds), and the short-term/money market class (fixed-income securities of all types maturing in one year or less).

• Maintaining a neutral mix over time of 60% of assets in stocks, 35% of assets in bonds, and 5% of assets in short-term and money market instruments.

• Adjusting allocation among asset classes gradually within the following ranges: stock class (40%-90%), bond class (10%-60%), and short-term/money market class (0%-50%).

• Investing in domestic and foreign issuers.

• Investing in Fidelity's central funds (specialized investment vehicles used by Fidelity^® funds to invest in particular security types or investment disciplines).

Principal Investment Risks

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.

• Foreign Exposure. Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile. Foreign exchange rates also can be extremely volatile.

• Prepayment. The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. Lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds) and certain types of other securities involve greater risk of default or price changes due to changes in the credit quality of the issuer. The value of lower-quality debt securities and certain types of other securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments.

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. You could lose money by investing in the fund.

Performance

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 and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Year-by-Year Returns

Calendar Years

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	16.85%	June 30, 2009
Lowest Quarter Return	-15.59%	December 31, 2008
Year-to-Date Return	12.24%	September 30, 2017

Average Annual Returns

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

Average Annual Total Returns{- Fidelity Asset Manager® 60%} - 09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 - Fidelity Asset Manager® 60%	Past 1 year	Past 5 years	Since Inception	[1]	Inception Date
Fidelity Asset Manager 60%-Retail Class					Oct. 09, 2007
Fidelity Asset Manager 60%-Retail Class | Return Before Taxes	6.76%	8.15%	4.35%
Fidelity Asset Manager 60%-Retail Class | After Taxes on Distributions	6.21%	6.95%	3.44%		Oct. 09, 2007
Fidelity Asset Manager 60%-Retail Class | After Taxes on Distributions and Sales	3.99%	6.13%	3.17%		Oct. 09, 2007
S&P 500® Index(reflects no deduction for fees, expenses, or taxes)	11.96%	14.66%	6.24%
Fidelity Asset Manager 60% Composite Index℠(reflects no deduction for fees or expenses)	7.21%	8.27%	4.55%

[1] Differs from the ratios of expenses to average net assets in the Financial Highlights section of the prospectus because of acquired fund fees and expenses.

[1] From October 9, 2007

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY CHARLES STREET TRUST

Prospectus Date

rr_ProspectusDate

Nov. 29, 2017

09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 | Fidelity Asset Manager® 60%

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund/Class:
Fidelity Asset Manager® 60%/Fidelity Asset Manager® 60%

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks high total return over the long term by allocating its assets among stocks, bonds, short-term instruments, and other investments.

Expense [Heading]

rr_ExpenseHeading

Fee Table

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder fees

(fees paid directly from your investment)

rr_ShareholderFeeOther

none

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Operating Expenses

(expenses that you pay each year as a % 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 operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 18% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

18.00%

Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text]

rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees

Differs from the ratios of expenses to average net assets in the Financial Highlights section of the prospectus because of acquired fund fees and expenses.

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

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:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Sell All Shares

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

• Allocating the fund's assets among three main asset classes: the stock class (equity securities of all types), the bond class (fixed-income securities of all types maturing in more than one year, including lower-quality debt securities which are sometimes referred to as high yield debt securities or junk bonds), and the short-term/money market class (fixed-income securities of all types maturing in one year or less).

• Maintaining a neutral mix over time of 60% of assets in stocks, 35% of assets in bonds, and 5% of assets in short-term and money market instruments.

• Adjusting allocation among asset classes gradually within the following ranges: stock class (40%-90%), bond class (10%-60%), and short-term/money market class (0%-50%).

• Investing in domestic and foreign issuers.

• Investing in Fidelity's central funds (specialized investment vehicles used by Fidelity^® funds to invest in particular security types or investment disciplines).

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.

• Foreign Exposure. Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile. Foreign exchange rates also can be extremely volatile.

• Prepayment. The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. Lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds) and certain types of other securities involve greater risk of default or price changes due to changes in the credit quality of the issuer. The value of lower-quality debt securities and certain types of other securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments.

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. You could lose money by investing in the fund.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could 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 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 and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.fidelity.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

rr_BarChartHeading

Year-by-Year Returns

Calendar Years

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	16.85%	June 30, 2009
Lowest Quarter Return	-15.59%	December 31, 2008
Year-to-Date Return	12.24%	September 30, 2017

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Returns

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

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

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 | Fidelity Asset Manager® 60% | Fidelity Asset Manager 60%-Retail Class

Risk/Return:

rr_RiskReturnAbstract

Management fee

rr_ManagementFeesOverAssets

0.55%

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

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.16%

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.02%

Total annual operating expenses

rr_ExpensesOverAssets

0.73%

^[1]

1 year

rr_ExpenseExampleYear01

$ 75

3 years

rr_ExpenseExampleYear03

233

5 years

rr_ExpenseExampleYear05

406

10 years

rr_ExpenseExampleYear10

$ 906

2008

rr_AnnualReturn2008

(30.01%)

2009

rr_AnnualReturn2009

32.72%

2010

rr_AnnualReturn2010

14.29%

2011

rr_AnnualReturn2011

(2.16%)

2012

rr_AnnualReturn2012

12.72%

2013

rr_AnnualReturn2013

16.89%

2014

rr_AnnualReturn2014

5.76%

2015

rr_AnnualReturn2015

(0.55%)

2016

rr_AnnualReturn2016

6.76%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Sep. 30, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

12.24%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

16.85%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(15.59%)

Inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 09, 2007

09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 | Fidelity Asset Manager® 60% | Return Before Taxes | Fidelity Asset Manager 60%-Retail Class

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 60%

Label

rr_AverageAnnualReturnLabel

Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

6.76%

Past 5 years

rr_AverageAnnualReturnYear05

8.15%

Since Inception

rr_AverageAnnualReturnSinceInception

4.35%

^[2]

09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 | Fidelity Asset Manager® 60% | After Taxes on Distributions | Fidelity Asset Manager 60%-Retail Class

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 60%

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Past 1 year

rr_AverageAnnualReturnYear01

6.21%

Past 5 years

rr_AverageAnnualReturnYear05

6.95%

Since Inception

rr_AverageAnnualReturnSinceInception

3.44%

^[2]

Inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 09, 2007

09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 | Fidelity Asset Manager® 60% | After Taxes on Distributions and Sales | Fidelity Asset Manager 60%-Retail Class

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 60%

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Past 1 year

rr_AverageAnnualReturnYear01

3.99%

Past 5 years

rr_AverageAnnualReturnYear05

6.13%

Since Inception

rr_AverageAnnualReturnSinceInception

3.17%

^[2]

Inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 09, 2007

09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 | Fidelity Asset Manager® 60% | S&P 500® Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

11.96%

Past 5 years

rr_AverageAnnualReturnYear05

14.66%

Since Inception

rr_AverageAnnualReturnSinceInception

6.24%

^[2]

09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 | Fidelity Asset Manager® 60% | Fidelity Asset Manager 60% Composite Index℠(reflects no deduction for fees or expenses)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

7.21%

Past 5 years

rr_AverageAnnualReturnYear05

8.27%

Since Inception

rr_AverageAnnualReturnSinceInception

4.55%

^[2]

[1] Differs from the ratios of expenses to average net assets in the Financial Highlights section of the prospectus because of acquired fund fees and expenses.

[2] From October 9, 2007

XML

09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 | Fidelity Asset Manager® 70%

Fund Summary

Fund/Class:
Fidelity Asset Manager® 70%/Fidelity Asset Manager® 70%

Investment Objective

The fund seeks to maximize total return over the long term by allocating its assets among stocks, bonds, short-term instruments, and other investments.

Fee Table

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder fees

Shareholder Fees {- Fidelity Asset Manager® 70%}	09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 Fidelity Asset Manager® 70% USD ($)
(fees paid directly from your investment)	none

Annual Operating Expenses

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

Annual Operating Expenses {- Fidelity Asset Manager® 70%}	09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 Fidelity Asset Manager® 70% Fidelity Asset Manager 70%-Retail Class
Management fee	0.55%
Distribution and/or Service (12b-1) fees	none
Other expenses	0.16%
Acquired fund fees and expenses	0.02%
Total annual operating expenses	0.73%	[1]

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

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:

Sell All Shares

Expense Example {- Fidelity Asset Manager® 70%}	09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 Fidelity Asset Manager® 70% Fidelity Asset Manager 70%-Retail Class USD ($)
1 year	$ 75
3 years	233
5 years	406
10 years	$ 906

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 operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 19% of the average value of its portfolio.

Principal Investment Strategies

• Allocating the fund's assets among three main asset classes: the stock class (equity securities of all types), the bond class (fixed-income securities of all types maturing in more than one year, including lower-quality debt securities which are sometimes referred to as high yield debt securities or junk bonds), and the short-term/money market class (fixed-income securities of all types maturing in one year or less).

• Maintaining a neutral mix over time of 70% of assets in stocks, 25% of assets in bonds, and 5% of assets in short-term and money market instruments.

• Adjusting allocation among asset classes gradually within the following ranges: stock class (50%-100%), bond class (0%-50%), and short-term/money market class (0%-50%).

• Investing in domestic and foreign issuers.

• Investing in Fidelity's central funds (specialized investment vehicles used by Fidelity^® funds to invest in particular security types or investment disciplines).

Principal Investment Risks

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.

• Foreign Exposure. Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile. Foreign exchange rates also can be extremely volatile.

• Prepayment. The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. Lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds) and certain types of other securities involve greater risk of default or price changes due to changes in the credit quality of the issuer. The value of lower-quality debt securities and certain types of other securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments.

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. You could lose money by investing in the fund.

Performance

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 and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Year-by-Year Returns

Calendar Years

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	18.44%	June 30, 2009
Lowest Quarter Return	-18.82%	December 31, 2008
Year-to-Date Return	13.87%	September 30, 2017

Average Annual Returns

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

Average Annual Total Returns{- Fidelity Asset Manager® 70%} - 09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 - Fidelity Asset Manager® 70%	Past 1 year	Past 5 years	Past 10 years
Fidelity Asset Manager 70%-Retail Class | Return Before Taxes	7.08%	9.04%	4.98%
Fidelity Asset Manager 70%-Retail Class | After Taxes on Distributions	6.58%	7.93%	4.17%
Fidelity Asset Manager 70%-Retail Class | After Taxes on Distributions and Sales	4.20%	6.94%	3.76%
S&P 500® Index(reflects no deduction for fees, expenses, or taxes)	11.96%	14.66%	6.95%
Fidelity Asset Manager 70% Composite Index℠(reflects no deduction for fees or expenses)	7.95%	9.27%	5.17%

[1] Differs from the ratios of expenses to average net assets in the Financial Highlights section of the prospectus because of acquired fund fees and expenses.

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY CHARLES STREET TRUST

Prospectus Date

rr_ProspectusDate

Nov. 29, 2017

09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 | Fidelity Asset Manager® 70%

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund/Class:
Fidelity Asset Manager® 70%/Fidelity Asset Manager® 70%

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks to maximize total return over the long term by allocating its assets among stocks, bonds, short-term instruments, and other investments.

Expense [Heading]

rr_ExpenseHeading

Fee Table

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder fees

(fees paid directly from your investment)

rr_ShareholderFeeOther

none

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Operating Expenses

(expenses that you pay each year as a % 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 operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 19% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

19.00%

Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text]

rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees

Differs from the ratios of expenses to average net assets in the Financial Highlights section of the prospectus because of acquired fund fees and expenses.

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

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:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Sell All Shares

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

• Allocating the fund's assets among three main asset classes: the stock class (equity securities of all types), the bond class (fixed-income securities of all types maturing in more than one year, including lower-quality debt securities which are sometimes referred to as high yield debt securities or junk bonds), and the short-term/money market class (fixed-income securities of all types maturing in one year or less).

• Maintaining a neutral mix over time of 70% of assets in stocks, 25% of assets in bonds, and 5% of assets in short-term and money market instruments.

• Adjusting allocation among asset classes gradually within the following ranges: stock class (50%-100%), bond class (0%-50%), and short-term/money market class (0%-50%).

• Investing in domestic and foreign issuers.

• Investing in Fidelity's central funds (specialized investment vehicles used by Fidelity^® funds to invest in particular security types or investment disciplines).

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.

• Foreign Exposure. Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile. Foreign exchange rates also can be extremely volatile.

• Prepayment. The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. Lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds) and certain types of other securities involve greater risk of default or price changes due to changes in the credit quality of the issuer. The value of lower-quality debt securities and certain types of other securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments.

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. You could lose money by investing in the fund.

Risk Lose Money [Text]

rr_RiskLoseMoney

You could 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 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 and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.fidelity.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

rr_BarChartHeading

Year-by-Year Returns

Calendar Years

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	18.44%	June 30, 2009
Lowest Quarter Return	-18.82%	December 31, 2008
Year-to-Date Return	13.87%	September 30, 2017

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Returns

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

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

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 | Fidelity Asset Manager® 70% | Fidelity Asset Manager 70%-Retail Class

Risk/Return:

rr_RiskReturnAbstract

Management fee

rr_ManagementFeesOverAssets

0.55%

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

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.16%

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.02%

Total annual operating expenses

rr_ExpensesOverAssets

0.73%

^[1]

1 year

rr_ExpenseExampleYear01

$ 75

3 years

rr_ExpenseExampleYear03

233

5 years

rr_ExpenseExampleYear05

406

10 years

rr_ExpenseExampleYear10

$ 906

2007

rr_AnnualReturn2007

7.20%

2008

rr_AnnualReturn2008

(34.92%)

2009

rr_AnnualReturn2009

35.66%

2010

rr_AnnualReturn2010

15.78%

2011

rr_AnnualReturn2011

(3.75%)

2012

rr_AnnualReturn2012

14.12%

2013

rr_AnnualReturn2013

20.12%

2014

rr_AnnualReturn2014

5.61%

2015

rr_AnnualReturn2015

(0.55%)

2016

rr_AnnualReturn2016

7.08%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Sep. 30, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

13.87%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

18.44%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(18.82%)

09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 | Fidelity Asset Manager® 70% | Return Before Taxes | Fidelity Asset Manager 70%-Retail Class

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 70%

Label

rr_AverageAnnualReturnLabel

Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

7.08%

Past 5 years

rr_AverageAnnualReturnYear05

9.04%

Past 10 years

rr_AverageAnnualReturnYear10

4.98%

09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 | Fidelity Asset Manager® 70% | After Taxes on Distributions | Fidelity Asset Manager 70%-Retail Class

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 70%

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Past 1 year

rr_AverageAnnualReturnYear01

6.58%

Past 5 years

rr_AverageAnnualReturnYear05

7.93%

Past 10 years

rr_AverageAnnualReturnYear10

4.17%

09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 | Fidelity Asset Manager® 70% | After Taxes on Distributions and Sales | Fidelity Asset Manager 70%-Retail Class

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 70%

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Past 1 year

rr_AverageAnnualReturnYear01

4.20%

Past 5 years

rr_AverageAnnualReturnYear05

6.94%

Past 10 years

rr_AverageAnnualReturnYear10

3.76%

09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 | Fidelity Asset Manager® 70% | S&P 500® Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

11.96%

Past 5 years

rr_AverageAnnualReturnYear05

14.66%

Past 10 years

rr_AverageAnnualReturnYear10

6.95%

09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 | Fidelity Asset Manager® 70% | Fidelity Asset Manager 70% Composite Index℠(reflects no deduction for fees or expenses)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

7.95%

Past 5 years

rr_AverageAnnualReturnYear05

9.27%

Past 10 years

rr_AverageAnnualReturnYear10

5.17%

[1] Differs from the ratios of expenses to average net assets in the Financial Highlights section of the prospectus because of acquired fund fees and expenses.

XML

09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 | Fidelity Asset Manager® 85%

Fund Summary

Fund/Class:
Fidelity Asset Manager® 85%/Fidelity Asset Manager® 85%

Investment Objective

The fund seeks to maximize total return over the long term by allocating its assets among stocks, bonds, short-term instruments, and other investments.

Fee Table

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder fees

Shareholder Fees {- Fidelity Asset Manager® 85%}	09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 Fidelity Asset Manager® 85% USD ($)
(fees paid directly from your investment)	none

Annual Operating Expenses

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

Annual Operating Expenses {- Fidelity Asset Manager® 85%}	09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 Fidelity Asset Manager® 85% Fidelity Asset Manager 85%-Retail Class
Management fee	0.55%
Distribution and/or Service (12b-1) fees	none
Other expenses	0.18%
Acquired fund fees and expenses	0.02%
Total annual operating expenses	0.75%	[1]

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

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:

Sell All Shares

Expense Example {- Fidelity Asset Manager® 85%}	09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 Fidelity Asset Manager® 85% Fidelity Asset Manager 85%-Retail Class USD ($)
1 year	$ 77
3 years	240
5 years	417
10 years	$ 930

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 operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 23% of the average value of its portfolio.

Principal Investment Strategies

• Allocating the fund's assets between two main asset classes: the stock class (equity securities of all types) and the bond and short-term/money market class (fixed-income securities of all types and maturities, including lower-quality debt securities which are sometimes referred to as high yield debt securities or junk bonds).

• Maintaining a neutral mix over time of 85% of assets in stocks and 15% of assets in bonds and short-term and money market instruments.

• Adjusting allocation between asset classes gradually within the following ranges: stock class (60%-100%) and bond and short-term/money market class (0%-40%).

• Investing in domestic and foreign issuers.

• Investing in Fidelity's central funds (specialized investment vehicles used by Fidelity^® funds to invest in particular security types or investment disciplines).

Principal Investment Risks

• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.

• Foreign Exposure. Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile. Foreign exchange rates also can be extremely volatile.

• Prepayment. The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. Lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds) and certain types of other securities involve greater risk of default or price changes due to changes in the credit quality of the issuer. The value of lower-quality debt securities and certain types of other securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments.

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. You could lose money by investing in the fund.

Performance

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 and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Year-by-Year Returns

Calendar Years

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	20.85%	June 30, 2009
Lowest Quarter Return	-20.95%	December 31, 2008
Year-to-Date Return	16.36%	September 30, 2017

Average Annual Returns

After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

Average Annual Total Returns{- Fidelity Asset Manager® 85%} - 09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 - Fidelity Asset Manager® 85%	Past 1 year	Past 5 years	Past 10 years
Fidelity Asset Manager 85%-Retail Class | Return Before Taxes	7.38%	10.41%	5.14%
Fidelity Asset Manager 85%-Retail Class | After Taxes on Distributions	7.01%	9.23%	4.40%
Fidelity Asset Manager 85%-Retail Class | After Taxes on Distributions and Sales	4.42%	8.06%	3.96%
S&P 500® Index(reflects no deduction for fees, expenses, or taxes)	11.96%	14.66%	6.95%
Fidelity Asset Manager 85% Composite Index℠(reflects no deduction for fees or expenses)	9.22%	10.92%	5.42%

[1] Differs from the ratios of expenses to average net assets in the Financial Highlights section of the prospectus because of acquired fund fees and expenses.

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

FIDELITY CHARLES STREET TRUST

Prospectus Date

rr_ProspectusDate

Nov. 29, 2017

09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 | Fidelity Asset Manager® 85%

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Summary

Fund/Class:
Fidelity Asset Manager® 85%/Fidelity Asset Manager® 85%

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks to maximize total return over the long term by allocating its assets among stocks, bonds, short-term instruments, and other investments.

Expense [Heading]

rr_ExpenseHeading

Fee Table

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that may be incurred when you buy and hold shares of the fund.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder fees

(fees paid directly from your investment)

rr_ShareholderFeeOther

none

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Operating Expenses

(expenses that you pay each year as a % 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 operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 23% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

23.00%

Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text]

rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees

Differs from the ratios of expenses to average net assets in the Financial Highlights section of the prospectus because of acquired fund fees and expenses.

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example helps compare the cost of investing in the fund with the cost of investing in other funds.

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:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Sell All Shares

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

• Allocating the fund's assets between two main asset classes: the stock class (equity securities of all types) and the bond and short-term/money market class (fixed-income securities of all types and maturities, including lower-quality debt securities which are sometimes referred to as high yield debt securities or junk bonds).

• Maintaining a neutral mix over time of 85% of assets in stocks and 15% of assets in bonds and short-term and money market instruments.

• Adjusting allocation between asset classes gradually within the following ranges: stock class (60%-100%) and bond and short-term/money market class (0%-40%).

• Investing in domestic and foreign issuers.

• Investing in Fidelity's central funds (specialized investment vehicles used by Fidelity^® funds to invest in particular security types or investment disciplines).

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

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• Stock Market Volatility. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments.

• Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease.

• Foreign Exposure. Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile. Foreign exchange rates also can be extremely volatile.

• Prepayment. The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change.

• Issuer-Specific Changes. The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. Lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds) and certain types of other securities involve greater risk of default or price changes due to changes in the credit quality of the issuer. The value of lower-quality debt securities and certain types of other securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments.

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. You could lose money by investing in the fund.

Risk Lose Money [Text]

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You could 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 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 and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. The indexes have characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance.

Visit www.fidelity.com for more recent performance information.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time.

Performance Availability Website Address [Text]

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www.fidelity.com

Performance Past Does Not Indicate Future [Text]

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Past performance (before and after taxes) is not an indication of future performance.

Bar Chart [Heading]

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Year-by-Year Returns

Calendar Years

Bar Chart Closing [Text Block]

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During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	20.85%	June 30, 2009
Lowest Quarter Return	-20.95%	December 31, 2008
Year-to-Date Return	16.36%	September 30, 2017

Performance Table Heading

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Average Annual Returns

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, but do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

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The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

Performance Table Narrative

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After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).

For the periods ended December 31, 2016

09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 | Fidelity Asset Manager® 85% | Fidelity Asset Manager 85%-Retail Class

Risk/Return:

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Management fee

rr_ManagementFeesOverAssets

0.55%

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

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.18%

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.02%

Total annual operating expenses

rr_ExpensesOverAssets

0.75%

^[1]

1 year

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$ 77

3 years

rr_ExpenseExampleYear03

240

5 years

rr_ExpenseExampleYear05

417

10 years

rr_ExpenseExampleYear10

$ 930

2007

rr_AnnualReturn2007

7.94%

2008

rr_AnnualReturn2008

(38.60%)

2009

rr_AnnualReturn2009

38.67%

2010

rr_AnnualReturn2010

16.57%

2011

rr_AnnualReturn2011

(6.10%)

2012

rr_AnnualReturn2012

15.93%

2013

rr_AnnualReturn2013

25.16%

2014

rr_AnnualReturn2014

5.90%

2015

rr_AnnualReturn2015

(0.58%)

2016

rr_AnnualReturn2016

7.38%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Sep. 30, 2017

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

16.36%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

20.85%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(20.95%)

09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 | Fidelity Asset Manager® 85% | Return Before Taxes | Fidelity Asset Manager 85%-Retail Class

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 85%

Label

rr_AverageAnnualReturnLabel

Return Before Taxes

Past 1 year

rr_AverageAnnualReturnYear01

7.38%

Past 5 years

rr_AverageAnnualReturnYear05

10.41%

Past 10 years

rr_AverageAnnualReturnYear10

5.14%

09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 | Fidelity Asset Manager® 85% | After Taxes on Distributions | Fidelity Asset Manager 85%-Retail Class

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 85%

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Past 1 year

rr_AverageAnnualReturnYear01

7.01%

Past 5 years

rr_AverageAnnualReturnYear05

9.23%

Past 10 years

rr_AverageAnnualReturnYear10

4.40%

09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 | Fidelity Asset Manager® 85% | After Taxes on Distributions and Sales | Fidelity Asset Manager 85%-Retail Class

Risk/Return:

rr_RiskReturnAbstract

Column

rr_AverageAnnualReturnColumnName

Fidelity Asset Manager® 85%

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Past 1 year

rr_AverageAnnualReturnYear01

4.42%

Past 5 years

rr_AverageAnnualReturnYear05

8.06%

Past 10 years

rr_AverageAnnualReturnYear10

3.96%

09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 | Fidelity Asset Manager® 85% | S&P 500® Index(reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

11.96%

Past 5 years

rr_AverageAnnualReturnYear05

14.66%

Past 10 years

rr_AverageAnnualReturnYear10

6.95%

09.30 Fidelity Asset Manager Funds Retail Combo PRO-06 | Fidelity Asset Manager® 85% | Fidelity Asset Manager 85% Composite Index℠(reflects no deduction for fees or expenses)

Risk/Return:

rr_RiskReturnAbstract

Past 1 year

rr_AverageAnnualReturnYear01

9.22%

Past 5 years

rr_AverageAnnualReturnYear05

10.92%

Past 10 years

rr_AverageAnnualReturnYear10

5.42%

[1] Differs from the ratios of expenses to average net assets in the Financial Highlights section of the prospectus because of acquired fund fees and expenses.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	FIDELITY CHARLES STREET TRUST
Prospectus Date	rr_ProspectusDate	Nov. 29, 2017
Document Creation Date	dei_DocumentCreationDate	Nov. 28, 2017