000001 - Document - Document and Entity Information
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020000 - Document - Risk/Return Summary {Unlabeled} - Morgan Stanley Mortgage Securities Trust
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020001 - Schedule - Annual Fund Operating Expenses
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020002 - Schedule - Expense Example {Transposed}
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020003 - Schedule - Expense Example No Redemption {Transposed}
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020004 - Disclosure - Risk/Return Detail Data {Elements} - Morgan Stanley Mortgage Securities Trust
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