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Performance Management - Treasury Instruments Portfolio
Nov. 30, 2025
Prospectus [Line Items]  
Bar Chart and Performance Table [Heading] PORTFOLIO PERFORMANCE
Performance Narrative [Text Block]
The bar chart and table that follow provide an indication of the risks of investing in the Portfolio by showing changes in the performance of the Portfolio from year to year. As of the date of this Prospectus, Digital Enabled Shares had not commenced operations. Digital Enabled Shares would have similar annual returns when compared with Shares because each class is invested in the same portfolio of securities. The annual return of Shares would differ from those of Digital Enabled Shares only to the extent that the classes do not have the same expenses.
The Portfolio’s past performance is not necessarily an indication of how the Portfolio will perform in the future.
Updated performance information for the Portfolio is available and may be obtained on the Portfolio’s website at www.northerntrust.com/united‑states/what‑we‑do/investment‑management/northern‑funds/funds‑and‑performance‑institutional or by calling 800‑637‑1380.
Performance Past Does Not Indicate Future [Text] The Portfolio’s past performance is not necessarily an indication of how the Portfolio will perform in the future.
Performance Information Illustrates Variability of Returns [Text] The bar chart and table that follow provide an indication of the risks of investing in the Portfolio by showing changes in the performance of the Portfolio from year to year.
Performance One Year or Less [Text] As of the date of this Prospectus, Digital Enabled Shares had not commenced operations.
Bar Chart, Returns for Class Not Offered in Prospectus [Text] As of the date of this Prospectus, Digital Enabled Shares had not commenced operations. Digital Enabled Shares would have similar annual returns when compared with Shares because each class is invested in the same portfolio of securities. The annual return of Shares would differ from those of Digital Enabled Shares only to the extent that the classes do not have the same expenses.
Bar Chart [Heading] CALENDAR YEAR TOTAL RETURNS (SHARES)*
Bar Chart Closing [Text Block]
* For the periods shown in the bar chart above:
 
 
highest quarterly return
   1.07%    1st quarter of 2025
 
lowest quarterly return
   0.99%    4th quarter of 2025
Performance Table Heading AVERAGE ANNUAL TOTAL RETURNS (For the periods ended December 31, 2025)
Performance Table Closing [Text Block]
The 7-day yield for Shares of the Portfolio as of December 31, 2025: 3.75%. For the current 7-day yield call 800-637-1380 or visit www.northerntrust.com/united-states/what-we-do/investment-management/northern-funds/funds-and-performance-institutional.
Money Market Seven Day Yield, Caption [Optional Text] The 7-day yield for Shares of the Portfolio as of December 31, 2025:
Money Market Seven Day Yield Phone 800-637-1380
Performance Availability Website Address [Text] www.northerntrust.com/united‑states/what‑we‑do/investment‑management/northern‑funds/funds‑and‑performance‑institutional
Performance Availability Phone [Text] 800‑637‑1380
Shares  
Prospectus [Line Items]  
Highest Quarterly Return, Label [Optional Text] highest quarterly return
Highest Quarterly Return 1.07%
Highest Quarterly Return, Date Mar. 31, 2025
Lowest Quarterly Return, Label [Optional Text] lowest quarterly return
Lowest Quarterly Return 0.99%
Lowest Quarterly Return, Date Dec. 31, 2025
Money Market Seven Day Yield 3.75%