000000 - Document - Document and Entity Information {Elements}
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000011 - Document - Risk/Return Summary {Unlabeled} - NORTHERN INSTITUTIONAL PRIME OBLIGATIONS PORTFOLIO
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000012 - Schedule - Shareholder Fees {- NORTHERN INSTITUTIONAL PRIME OBLIGATIONS PORTFOLIO}
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000013 - Schedule - Annual Fund Operating Expenses {- NORTHERN INSTITUTIONAL PRIME OBLIGATIONS PORTFOLIO}
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000014 - Schedule - Expense Example {Transposed} {- NORTHERN INSTITUTIONAL PRIME OBLIGATIONS PORTFOLIO}
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000015 - Schedule - Expense Example, No Redemption {Transposed} {- NORTHERN INSTITUTIONAL PRIME OBLIGATIONS PORTFOLIO}
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000016 - Schedule - Annual Total Returns - NORTHERN INSTITUTIONAL PRIME OBLIGATIONS PORTFOLIO [BarChart]
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000017 - Schedule - Average Annual Total Returns {Transposed} {- NORTHERN INSTITUTIONAL PRIME OBLIGATIONS PORTFOLIO}
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000018 - Document - Risk/Return Detail {Unlabeled} - NORTHERN INSTITUTIONAL PRIME OBLIGATIONS PORTFOLIO
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000019 - Disclosure - Risk/Return Detail Data {Elements} - NORTHERN INSTITUTIONAL PRIME OBLIGATIONS PORTFOLIO
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000021 - Document - Risk/Return Summary {Unlabeled} - NORTHERN INSTITUTIONAL U.S. GOVERNMENT SELECT PORTFOLIO
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000022 - Schedule - Shareholder Fees {- NORTHERN INSTITUTIONAL U.S. GOVERNMENT SELECT PORTFOLIO}
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000023 - Schedule - Annual Fund Operating Expenses {- NORTHERN INSTITUTIONAL U.S. GOVERNMENT SELECT PORTFOLIO}
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000024 - Schedule - Expense Example {Transposed} {- NORTHERN INSTITUTIONAL U.S. GOVERNMENT SELECT PORTFOLIO}
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000025 - Schedule - Expense Example, No Redemption {Transposed} {- NORTHERN INSTITUTIONAL U.S. GOVERNMENT SELECT PORTFOLIO}
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000026 - Schedule - Annual Total Returns - NORTHERN INSTITUTIONAL U.S. GOVERNMENT SELECT PORTFOLIO [BarChart]
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000027 - Schedule - Average Annual Total Returns {Transposed} {- NORTHERN INSTITUTIONAL U.S. GOVERNMENT SELECT PORTFOLIO}
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000028 - Document - Risk/Return Detail {Unlabeled} - NORTHERN INSTITUTIONAL U.S. GOVERNMENT SELECT PORTFOLIO
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000029 - Disclosure - Risk/Return Detail Data {Elements} - NORTHERN INSTITUTIONAL U.S. GOVERNMENT SELECT PORTFOLIO
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