Label	Element	Value
Risk Return Abstract	rr_RiskReturnAbstract
Prospectus Date	rr_ProspectusDate	Dec. 01, 2021
PIMCO Government Money Market Fund
Risk Return Abstract	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	PIMCO Government Money Market Fund
Objective [Heading]	rr_ObjectiveHeading	<span style="color:#00687D;font-family:Arial;font-size:10.92pt;font-weight:bold;margin-left:0%;">Investment Objective</span>
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The Fund seeks maximum current income, consistent with preservation of capital and daily liquidity.
Expense [Heading]	rr_ExpenseHeading	<span style="color:#00687D;font-family:Arial;font-size:10.92pt;font-weight:bold;margin-left:0%;">Fees and Expenses of the Fund</span>
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as commissions and other fees to financial intermediaries, which are not reflected in the table and example below.
Shareholder Fees Caption [Text]	rr_ShareholderFeesCaption	<span style="color:#323232;font-family:Arial;font-size:8pt;font-weight:bold;padding-left:0.0%;">Shareholder Fees (fees paid directly from your investment):</span>
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	<span style="color:#323232;font-family:Arial;font-size:9.10pt;font-weight:bold;margin-left:0%;">Annual Fund Operating Expenses (expenses that you pay each </span><span style="color:#323232;font-family:Arial;font-size:9.10pt;font-weight:bold;">year as a percentage of the value of your investment):</span>
Expense Example [Heading]	rr_ExpenseExampleHeading	<span style="color:#323232;font-family:Arial;font-size:9.10pt;font-weight:bold;margin-left:0%;">Example.</span>
Expense Example Narrative [Text Block]	rr_ExpenseExampleNarrativeTextBlock	The Example is intended to help you compare the cost of investing in Institutional Class, I-2, Class M, Administrative Class, Class A or Class C shares of the Fund with the costs of investing in other mutual funds. The Example assumes that you invest $10,000 in the noted class of shares for the time periods indicated, and then redeem all your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading]	rr_StrategyHeading	<span style="color:#00687D;font-family:Arial;font-size:10.92pt;font-weight:bold;margin-left:0%;">Principal Investment Strategies</span>
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	The Fund seeks to achieve its investment objective by investing under normal circumstances at least 80% of its assets in a portfolio of U.S. government securities. The Fund invests 100% of its total assets in (i) cash, (ii) U.S. government securities, such as U.S. Treasury bills, notes, and other obligations issued by, or guaranteed as to principal and interest by, the U.S. government (including its agencies and instrumentalities), and (iii) repurchase agreements that are collateralized fully by such U.S. government securities or cash. The Fund may only invest in U.S. dollar-denominated securities that mature in 397 days or fewer from the date of purchase. The dollar-weighted average portfolio maturity of the Fund may not exceed 60 days and the dollar-weighted average life to maturity of the Fund may not exceed 120 days. The Fund attempts to maintain a stable net asset value of $1.00 per share, although there is no assurance that it will be successful in doing so.The Fund’s investments will comply with applicable rules governing the quality, maturity and diversification of securities held by money market funds.The Fund may enter into reverse repurchase agreements and sale buy back transactions to satisfy redemption requests or for other temporary or emergency purposes.
Risk [Heading]	rr_RiskHeading	<span style="color:#00687D;font-family:Arial;font-size:10.92pt;font-weight:bold;margin-left:0%;">Principal Risks</span>
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	You could lose money by investing in the Fund.Although the Fund seeks to preserve the value of your investment at $1.00 per share, it cannot guarantee it will do so.An investment in the Fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.The Fund’s sponsor has no legal obligation to provide financial support to the Fund, and you should not expect that the sponsor will provide financial support to the Fund at any time. The principal risks of investing in the Fund, which could adversely affect its net asset value, yield and total return are listed below.Interest Rate Risk:  the risk that fixed income securities will decline in value because of an increase in interest rates; a fund with a longer average portfolio duration will be more sensitive to changes in interest rates than a fund with a shorter average portfolio durationCall Risk:  the risk that an issuer may exercise its right to redeem a fixed income security earlier than expected (a call). Issuers may call outstanding securities prior to their maturity for a number of reasons (e.g., declining interest rates, changes in credit spreads and improvements in the issuer’s credit quality). If an issuer calls a security that the Fund has invested in, the Fund may not recoup the full amount of its initial investment and may be forced to reinvest in lower-yielding securities, securities with greater credit risks or securities with other, less favorable featuresCredit Risk:  the risk that the Fund could lose money if the issuer or guarantor of a fixed income security, or the counterparty to a derivative contract, is unable or unwilling, or is perceived (whether by market participants, rating agencies, pricing services or otherwise) as unable or unwilling, to meet its financial obligationsMarket Risk:  the risk that the value of securities owned by the Fund may go up or down, sometimes rapidly or unpredictably, due to factors affecting securities markets generally or particular industriesManagement Risk:  the risk that the investment techniques and risk analyses applied by PIMCO will not produce the desired results and that actual or potential conflicts of interest, legislative, regulatory, or tax restrictions, policies or developments may affect the investment techniques available to PIMCO and the individual portfolio manager in connection with managing the Fund and may cause PIMCO to restrict or prohibit participation in certain investments. There is no guarantee that the investment objective of the Fund will be achievedReverse Repurchase Agreements and Other Borrowings Risk:the risk that reverse repurchase agreements or other borrowings may increase the Fund’s overall investment exposure and that the related transaction costs may detract from Fund performancePlease see “Description of Principal Risks” in the Fund's prospectus for a more detailed description of the risks of investing in the Fund.
Risk Lose Money [Text]	rr_RiskLoseMoney	<span style="color:#323232;font-family:Arial;font-size:9.10pt;margin-left:0%;">You could lose money by investing in the Fund.</span>
Risk Money Market Fund May Not Preserve Dollar [Text]	rr_RiskMoneyMarketFundMayNotPreserveDollar	<span style="color:#323232;font-family:Arial;font-size:9.10pt;">Although the Fund seeks to preserve the value of your investment at $1.00 per share, it cannot guarantee it will do so.</span>
Risk Not Insured [Text]	rr_RiskNotInsured	<span style="color:#323232;font-family:Arial;font-size:9.10pt;">An investment in the Fund is not insured or </span><span style="color:#323232;font-family:Arial;font-size:9.10pt;">guaranteed by the Federal Deposit Insurance Corporation or any other government agency.</span>
Risk Money Market Fund Sponsor May Not Provide Support [Text]	rr_RiskMoneyMarketFundSponsorMayNotProvideSupport	<span style="color:#323232;font-family:Arial;font-size:9.10pt;">The Fund’s sponsor has no legal obligation to </span><span style="color:#323232;font-family:Arial;font-size:9.10pt;">provide financial support to the Fund, and you should not expect that the sponsor will provide financial support to the Fund at any time.</span>
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	<span style="color:#00687D;font-family:Arial;font-size:10.92pt;font-weight:bold;margin-left:0%;">Performance Information</span>
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	The performance information shows summary performance information for the Fund in a bar chart and an Average Annual Total Returns table. The information provides some indication of the risks of investing in the Fund by showing changes in its performance from year to year and by showing how the Fund’s average annual returns compare with the returns of a broad-based securities market index and an index of similar funds. Absent any applicable fee waivers and/or expense limitations, performance would have been lower. The bar chart shows performance of the Fund’s Class M shares. For periods prior to the inception date of Institutional Class and Administrative Class shares (May 13, 2016), performance information shown in the table for that class is based on the performance of the Fund’s Class M shares, adjusted to reflect the fees and expenses paid by these classes of shares. To obtain the Fund’s current yield, call 888.87.PIMCO. The Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future.The Fund’s benchmark index is the FTSE 3-Month Treasury Bill Index. The index is an unmanaged index representing monthly return equivalents of yield averages of the last 3-month Treasury Bill issues. The Lipper Institutional U.S. Government Money Market Funds Average is a total return performance average of funds tracked by Lipper, Inc. that invest principally in financial instruments issued or guaranteed by the U.S. government, its agencies, or its instrumentalities with dollar-weighted average maturities of less than 90 days. These funds are commonly limited to 401(k) and pension participants and often require high minimum investments and have lower total expense ratios relative to other money market funds. They intend to keep constant net asset value.Performance for the Fund is updated daily and quarterly and may be obtained as follows: daily and quarterly updates on the net asset value and performance page at https://www.pimco.com/en-us/product-finder.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	<span style="color:#323232;font-family:Arial;font-size:9.10pt;">The information provides some indication of the risks of investing in the </span><span style="color:#323232;font-family:Arial;font-size:9.10pt;">Fund by showing changes in its performance from year to year and by showing how the Fund’s average annual returns compare with the returns of a broad-based securities market index and an index of similar funds.</span>
Performance Additional Market Index [Text]	rr_PerformanceAdditionalMarketIndex	<span style="color:#323232;font-family:Arial;font-size:9.10pt;margin-left:0%;">The Fund’s benchmark index is the FTSE 3-Month Treasury Bill Index. The </span><span style="color:#323232;font-family:Arial;font-size:9.10pt;">index is an unmanaged index representing monthly return equivalents of yield averages of the last 3-month Treasury Bill issues. The Lipper Institutional U.S. Government Money Market Funds Average is a total return performance average of funds tracked by Lipper, Inc. that invest principally in financial instruments issued or guaranteed by the U.S. government, its agencies, or its instrumentalities with dollar-weighted average maturities of less than 90 days. These funds are commonly limited to 401(k) and pension participants and often require high minimum investments and have lower total expense ratios relative to other money market funds. They intend to keep constant net asset value.</span>
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	<span style="color:#3333FF;font-family:Arial;font-size:9.10pt;">https://www.pimco.com/en-us/product-finder</span>
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	<span style="color:#323232;font-family:Arial;font-size:9.10pt;font-style:italic;">The Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future.</span>
Bar Chart [Heading]	rr_BarChartHeading	<span style="color:#FFFFFF;font-family:Arial;font-size:7.28pt;font-weight:bold;">Calendar Year Total Returns — Class M</span>
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Best QuarterJune 30, 20190.58%Worst QuarterSeptember 30, 20130.00%Year-to-DateJune 30, 20210.00%
Performance Table Heading	rr_PerformanceTableHeading	<span style="color:#323232;font-family:Arial;font-size:9.10pt;font-weight:bold;margin-left:0%;">Average Annual Total Returns (for periods ended 12/31/20)</span>
PIMCO Government Money Market Fund | Institutional
Risk Return Abstract	rr_RiskReturnAbstract
Shareholder Fees (fees paid directly from your investment):	rr_ShareholderFeeOther		[1]
Management Fees	rr_ManagementFeesOverAssets	0.18%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	0.18%	[1]
1 Year	rr_ExpenseExampleYear01	$ 18
3 Years	rr_ExpenseExampleYear03	58
5 Years	rr_ExpenseExampleYear05	101
10 Years	rr_ExpenseExampleYear10	$ 230
1 Year	rr_AverageAnnualReturnYear01	0.31%
5 Years	rr_AverageAnnualReturnYear05	1.06%
10 Years	rr_AverageAnnualReturnYear10	0.55%
PIMCO Government Money Market Fund | I-2
Risk Return Abstract	rr_RiskReturnAbstract
Shareholder Fees (fees paid directly from your investment):	rr_ShareholderFeeOther		[1]
Management Fees	rr_ManagementFeesOverAssets	0.28%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	0.28%	[1]
1 Year	rr_ExpenseExampleYear01	$ 29
3 Years	rr_ExpenseExampleYear03	90
5 Years	rr_ExpenseExampleYear05	157
10 Years	rr_ExpenseExampleYear10	$ 356
1 Year	rr_AverageAnnualReturnYear01	0.28%
5 Years	rr_AverageAnnualReturnYear05	0.97%
10 Years	rr_AverageAnnualReturnYear10	0.50%
PIMCO Government Money Market Fund | M
Risk Return Abstract	rr_RiskReturnAbstract
Shareholder Fees (fees paid directly from your investment):	rr_ShareholderFeeOther		[1]
Management Fees	rr_ManagementFeesOverAssets	0.18%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	0.18%	[1]
1 Year	rr_ExpenseExampleYear01	$ 18
3 Years	rr_ExpenseExampleYear03	58
5 Years	rr_ExpenseExampleYear05	101
10 Years	rr_ExpenseExampleYear10	$ 230
2011	rr_AnnualReturn2011	0.03%
2012	rr_AnnualReturn2012	0.05%
2013	rr_AnnualReturn2013	0.01%
2014	rr_AnnualReturn2014	0.02%
2015	rr_AnnualReturn2015	0.05%
2016	rr_AnnualReturn2016	0.30%
2017	rr_AnnualReturn2017	0.81%
2018	rr_AnnualReturn2018	1.78%
2019	rr_AnnualReturn2019	2.12%
2020	rr_AnnualReturn2020	0.31%
Year to Date Return, Label	rr_YearToDateReturnLabel	<span style="color:#323232;font-family:Arial;font-size:6.825pt;padding-left:0.0%;">Year-to-Date</span>
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Jun. 30, 2021
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	none
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	<span style="color:#323232;font-family:Arial;font-size:6.825pt;padding-left:0.0%;">Best Quarter</span>
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Jun. 30, 2019
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	0.58%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	<span style="color:#323232;font-family:Arial;font-size:6.825pt;padding-left:0.0%;">Worst Quarter</span>
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Sep. 30, 2013
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	none
1 Year	rr_AverageAnnualReturnYear01	0.31%
5 Years	rr_AverageAnnualReturnYear05	1.06%
10 Years	rr_AverageAnnualReturnYear10	0.54%
PIMCO Government Money Market Fund | Administrative
Risk Return Abstract	rr_RiskReturnAbstract
Shareholder Fees (fees paid directly from your investment):	rr_ShareholderFeeOther		[1]
Management Fees	rr_ManagementFeesOverAssets	0.18%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	0.18%	[1]
1 Year	rr_ExpenseExampleYear01	$ 18
3 Years	rr_ExpenseExampleYear03	58
5 Years	rr_ExpenseExampleYear05	101
10 Years	rr_ExpenseExampleYear10	$ 230
1 Year	rr_AverageAnnualReturnYear01	0.31%
5 Years	rr_AverageAnnualReturnYear05	1.06%
10 Years	rr_AverageAnnualReturnYear10	0.55%
PIMCO Government Money Market Fund | A
Risk Return Abstract	rr_RiskReturnAbstract
Shareholder Fees (fees paid directly from your investment):	rr_ShareholderFeeOther		[1]
Management Fees	rr_ManagementFeesOverAssets	0.33%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	0.33%	[1]
1 Year	rr_ExpenseExampleYear01	$ 34
3 Years	rr_ExpenseExampleYear03	106
5 Years	rr_ExpenseExampleYear05	185
10 Years	rr_ExpenseExampleYear10	$ 418
1 Year	rr_AverageAnnualReturnYear01	0.27%
5 Years	rr_AverageAnnualReturnYear05	0.93%
10 Years	rr_AverageAnnualReturnYear10	0.48%
PIMCO Government Money Market Fund | C
Risk Return Abstract	rr_RiskReturnAbstract
Shareholder Fees (fees paid directly from your investment):	rr_ShareholderFeeOther		[1]
Management Fees	rr_ManagementFeesOverAssets	0.33%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	0.33%	[1]
1 Year	rr_ExpenseExampleYear01	$ 34
3 Years	rr_ExpenseExampleYear03	106
5 Years	rr_ExpenseExampleYear05	185
10 Years	rr_ExpenseExampleYear10	$ 418
1 Year	rr_AverageAnnualReturnYear01	0.27%
5 Years	rr_AverageAnnualReturnYear05	0.93%
10 Years	rr_AverageAnnualReturnYear10	0.48%
PIMCO Government Money Market Fund | FTSE 3-Month Treasury Bill Index (reflects no deductions for fees, expenses or taxes)
Risk Return Abstract	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	0.58%
5 Years	rr_AverageAnnualReturnYear05	1.16%
10 Years	rr_AverageAnnualReturnYear10	0.60%
PIMCO Government Money Market Fund | Lipper Institutional U.S. Government Money Market Funds Average (reflects no deductions for taxes)
Risk Return Abstract	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	0.30%
5 Years	rr_AverageAnnualReturnYear05	0.85%
10 Years	rr_AverageAnnualReturnYear10	0.43%	[2]

[1] Regular sales charges may apply when Class A shares of the Fund (on which no sales charge was paid at the time of purchase) are exchanged for shares of other funds offered by the Trust.

[2] The Lipper Average’s since inception return is determined from the nearest month-end following the Fund’s inception date and not from the actual inception date of the Fund.