Global Bond Index Portfolio Expense Example - Portfolio [Member] - Global Bond Index Portfolio - Global Bond Index Portfolio	Dec. 31, 2025 USD ($)
Prospectus [Line Items]
Expense Example, with Redemption, 1 Year	$ 13
Expense Example, with Redemption, 3 Years	42
Expense Example, with Redemption, 5 Years	73
Expense Example, with Redemption, 10 Years	$ 166

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