000000 - Document - Document and Entity Information {Elements}
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000010 - Document - Risk/Return Supplement {Unlabeled} - NORTHERN INSTITUTIONAL GOVERNMENT ASSETS PORTFOLIO
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000011 - Document - Risk/Return Summary {Unlabeled} - NORTHERN INSTITUTIONAL GOVERNMENT ASSETS PORTFOLIO
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000012 - Schedule - Shareholder Fees
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000013 - Schedule - Annual Fund Operating Expenses
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000014 - Schedule - Expense Example {Transposed}
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000015 - Schedule - Expense Example, No Redemption {Transposed}
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000016 - Schedule - Annual Total Returns [BarChart]
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000017 - Schedule - Average Annual Total Returns {Transposed}
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000018 - Document - Risk/Return Detail {Unlabeled} - NORTHERN INSTITUTIONAL GOVERNMENT ASSETS PORTFOLIO
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000019 - Disclosure - Risk/Return Detail Data {Elements} - NORTHERN INSTITUTIONAL GOVERNMENT ASSETS PORTFOLIO
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