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Prospectus: rr_ProspectusTable  
Supplement Text Block pimcofunds-20200522_SupplementTextBlock
PIMCO Funds
Supplement dated May 22, 2020 to the Bond Funds Prospectus dated July 31, 2019,
as supplemented from time to time (the "Prospectus")
Disclosure Related to the PIMCO Total Return ESG Fund (the "Fund")
Effective June 22, 2020, the sixth through ninth sentences of the first paragraph of the "Principal Investment Strategies" section of the Fund's Fund Summary in the Prospectus are deleted and replaced with the following:
The Fund will not invest in the securities of any non-governmental issuer determined by PIMCO to be engaged principally in the manufacture of alcoholic beverages, tobacco products or military equipment, the operation of gambling casinos, the production or trade of pornographic materials, or in the oil industry, including extraction, production, and refining or the production, distribution of coal and coal fired generation. The Fund can invest in the securities of any issuer determined by PIMCO to be engaged principally in biofuel production, natural gas generation and sales and trading activities. However, green/sustainable bonds from issuers involved in fossil fuel-related sectors may be permitted. Labeled green bonds are those issues with proceeds specifically earmarked to be used for climate and environmental projects. Labeled green bonds are often verified by a third party, which certifies that the bond will fund projects that include environmental benefits. In addition, the Fund will not invest in the securities of any non- governmental issuer determined by PIMCO to be engaged principally in the provision of healthcare services or the manufacture of pharmaceuticals, unless the issuer derives 100% of its gross revenues from products or services designed to protect and improve the quality of human life, as determined on the basis of information available to PIMCO. To the extent possible on the basis of information available to PIMCO, an issuer will be deemed to be principally engaged in an activity if it derives more than 10% of its gross revenues from such activities.

PIMCO Funds
Supplement dated May 22, 2020 to the Short Duration Strategy Funds Prospectus dated July 31, 2019,
as supplemented from time to time (the "Prospectus")
Disclosure Related to the PIMCO Low Duration ESG Fund (the "Fund")
Effective June 22, 2020, the sixth through ninth sentences of the first paragraph of the "Principal Investment Strategies" section of the Fund's Fund Summary in the Prospectus are deleted and replaced with the following:
The Fund will not invest in the securities of any non-governmental issuer determined by PIMCO to be engaged principally in the manufacture of alcoholic beverages, tobacco products or military equipment, the operation of gambling casinos, the production or trade of pornographic materials, or in the oil industry, including extraction, production, and refining or the production, distribution of coal and coal fired generation. The Fund can invest in the securities of any issuer determined by PIMCO to be engaged principally in biofuel production, natural gas generation and sales and trading activities. However, green/sustainable bonds from issuers involved in fossil fuel-related sectors may be permitted. Labeled green bonds are those issues with proceeds specifically earmarked to be used for climate and environmental projects. Labeled green bonds are often verified by a third party, which certifies that the bond will fund projects that include environmental benefits. In addition, the Fund will not invest in the securities of any non- governmental issuer determined by PIMCO to be engaged principally in the provision of healthcare services or the manufacture of pharmaceuticals, unless the issuer derives 100% of its gross revenues from products or services designed to protect and improve the quality of human life, as determined on the basis of information available to PIMCO. To the extent possible on the basis of information available to PIMCO, an issuer will be deemed to be principally engaged in an activity if it derives more than 10% of its gross revenues from such activities.
(PIMCO Funds - Supplement) | (PIMCO Total Return ESG Fund)  
Prospectus: rr_ProspectusTable  
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund will not invest in the securities of any non-governmental issuer determined by PIMCO to be engaged principally in the manufacture of alcoholic beverages, tobacco products or military equipment, the operation of gambling casinos, the production or trade of pornographic materials, or in the oil industry, including extraction, production, and refining or the production, distribution of coal and coal fired generation. The Fund can invest in the securities of any issuer determined by PIMCO to be engaged principally in biofuel production, natural gas generation and sales and trading activities. However, green/sustainable bonds from issuers involved in fossil fuel-related sectors may be permitted. Labeled green bonds are those issues with proceeds specifically earmarked to be used for climate and environmental projects. Labeled green bonds are often verified by a third party, which certifies that the bond will fund projects that include environmental benefits. In addition, the Fund will not invest in the securities of any non- governmental issuer determined by PIMCO to be engaged principally in the provision of healthcare services or the manufacture of pharmaceuticals, unless the issuer derives 100% of its gross revenues from products or services designed to protect and improve the quality of human life, as determined on the basis of information available to PIMCO. To the extent possible on the basis of information available to PIMCO, an issuer will be deemed to be principally engaged in an activity if it derives more than 10% of its gross revenues from such activities.
(PIMCO Funds - Supplement) | (PIMCO Low Duration ESG Fund)  
Prospectus: rr_ProspectusTable  
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund will not invest in the securities of any non-governmental issuer determined by PIMCO to be engaged principally in the manufacture of alcoholic beverages, tobacco products or military equipment, the operation of gambling casinos, the production or trade of pornographic materials, or in the oil industry, including extraction, production, and refining or the production, distribution of coal and coal fired generation. The Fund can invest in the securities of any issuer determined by PIMCO to be engaged principally in biofuel production, natural gas generation and sales and trading activities. However, green/sustainable bonds from issuers involved in fossil fuel-related sectors may be permitted. Labeled green bonds are those issues with proceeds specifically earmarked to be used for climate and environmental projects. Labeled green bonds are often verified by a third party, which certifies that the bond will fund projects that include environmental benefits. In addition, the Fund will not invest in the securities of any non- governmental issuer determined by PIMCO to be engaged principally in the provision of healthcare services or the manufacture of pharmaceuticals, unless the issuer derives 100% of its gross revenues from products or services designed to protect and improve the quality of human life, as determined on the basis of information available to PIMCO. To the extent possible on the basis of information available to PIMCO, an issuer will be deemed to be principally engaged in an activity if it derives more than 10% of its gross revenues from such activities.