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Prospectus: rr_ProspectusTable  
Supplement Text Block pcsaif-20191202_SupplementTextBlock
PIMCO Funds

Supplement Dated December 2, 2019 to the Short Duration Strategy Funds Prospectus
dated July 31, 2019, as supplemented from time to time (the "Prospectus")

Disclosure Related to the PIMCO Short Asset Investment Fund (the "Fund")

Effective immediately, the table in the "Fees and Expenses of the Fund—Shareholder Fees" section of the Fund's Fund Summary in the Prospectus is deleted in its entirety and replaced by the following:

None(1)

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.

In addition, effective immediately, the Expense Example tables in the Fund's Fund Summary in the Prospectus are deleted in their entirety and replaced by the following:
 
 
1 Year
3 Years
5 Years
10 Years
Institutional Class
$39
$122
$213
$480
I-2
$49
$154
$269
$604
I-3
$54
$181
$319
$721
Class M
$39
$122
$213
$480
Administrative Class
$64
$202
$351
$786
Class A
$75
$233
$406
$906
(PIMCO FUNDS - Supplement) | (PIMCO Short Asset Investment Fund)  
Prospectus: rr_ProspectusTable  
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption None [1]
(PIMCO FUNDS - Supplement) | (PIMCO Short Asset Investment Fund) | Institutional Class  
Prospectus: rr_ProspectusTable  
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 39
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 122
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 213
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 480
(PIMCO FUNDS - Supplement) | (PIMCO Short Asset Investment Fund) | I-2  
Prospectus: rr_ProspectusTable  
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 49
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 154
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 269
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 604
(PIMCO FUNDS - Supplement) | (PIMCO Short Asset Investment Fund) | I-3  
Prospectus: rr_ProspectusTable  
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 54
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 181
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 319
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 721
(PIMCO FUNDS - Supplement) | (PIMCO Short Asset Investment Fund) | Class M  
Prospectus: rr_ProspectusTable  
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 39
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 122
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 213
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 480
(PIMCO FUNDS - Supplement) | (PIMCO Short Asset Investment Fund) | Administrative Class  
Prospectus: rr_ProspectusTable  
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 64
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 202
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 351
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 786
(PIMCO FUNDS - Supplement) | (PIMCO Short Asset Investment Fund) | Class A  
Prospectus: rr_ProspectusTable  
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 75
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 233
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 406
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 906
[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.