S000006017 [Member] Expense Example - Short-Term Treasury Portfolio - Class I	Jan. 31, 2026 USD ($)
Prospectus [Line Items]
Expense Example, with Redemption, 1 Year	$ 67
Expense Example, with Redemption, 3 Years	330
Expense Example, with Redemption, 5 Years	614
Expense Example, with Redemption, 10 Years	$ 1,423

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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