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Global Opportunity Portfolio  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] ck0000836487_SupplementTextBlock

Prospectus Supplement


December 7, 2017


Morgan Stanley Institutional Fund, Inc.


Supplement dated December 7, 2017 to the Morgan Stanley Institutional Fund, Inc. Prospectus dated May 1, 2017


Global Opportunity Portfolio
(the "Fund")


The maximum expense ratio of each share Class of the Fund has been amended, effective January 1, 2018. Accordingly, effective January 1, 2018, the Prospectus is hereby amended as follows:
Risk/Return [Heading] rr_RiskReturnHeading Global Opportunity Portfolio
Expense [Heading] rr_ExpenseHeading The Annual Fund Operating Expenses table under the section of the Prospectus entitled "Fund Summary—Global Opportunity Portfolio—Fees and Expenses—Annual Fund Operating Expenses" is hereby deleted in its entirety and replaced with the following:
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Expense Example [Heading] rr_ExpenseExampleHeading The Example information under the section of the Prospectus entitled "Fund Summary—Global Opportunity Portfolio—Fees and Expenses—Example" is hereby deleted in its entirety and replaced with the following:
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

Example
The example below is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.


The example assumes that you invest $10,000 in the Fund, your investment has a 5% return each year and the Fund's operating expenses remain the same (except that the example incorporates the fee waiver and/or expense reimbursement arrangement for only the first year). Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption If You SOLD Your Shares
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption If You HELD Your Shares
Expense Example Closing [Text Block] rr_ExpenseExampleClosingTextBlock

Please retain this supplement for future reference.
Global Opportunity Portfolio | Class I  
Risk/Return: rr_RiskReturnAbstract  
Advisory Fee rr_ManagementFeesOverAssets 0.80%
Distribution and/or Shareholder Service (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.27%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.07% [1]
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.07% [1]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.00% [1]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 102
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 333
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 583
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,299
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 102
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 333
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 583
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,299
Global Opportunity Portfolio | Class A  
Risk/Return: rr_RiskReturnAbstract  
Advisory Fee rr_ManagementFeesOverAssets 0.80%
Distribution and/or Shareholder Service (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.36%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.41% [1]
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.06% [1]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.35% [1]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 655
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 942
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,250
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,122
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 655
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 942
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,250
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,122
Global Opportunity Portfolio | Class L  
Risk/Return: rr_RiskReturnAbstract  
Advisory Fee rr_ManagementFeesOverAssets 0.80%
Distribution and/or Shareholder Service (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets 0.75%
Other Expenses rr_OtherExpensesOverAssets 0.38%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.93% [1]
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.53% [1]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.40% [1]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 143
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 555
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 993
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,211
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 143
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 555
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 993
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,211
Global Opportunity Portfolio | Class C  
Risk/Return: rr_RiskReturnAbstract  
Advisory Fee rr_ManagementFeesOverAssets 0.80%
Distribution and/or Shareholder Service (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses rr_OtherExpensesOverAssets 0.28%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.08% [1]
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets none [1]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 2.08% [1]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 311
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 652
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,119
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,410
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 211
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 652
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,119
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,410
Global Opportunity Portfolio | Class IS  
Risk/Return: rr_RiskReturnAbstract  
Advisory Fee rr_ManagementFeesOverAssets 0.80%
Distribution and/or Shareholder Service (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 3.02%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 3.82% [1]
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets 2.87% [1]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.95% [1]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 97
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 901
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,725
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 3,870
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 97
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 901
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,725
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 3,870
[1] The Fund's "Adviser," Morgan Stanley Investment Management Inc., has agreed to reduce its advisory fee and/or reimburse the Fund so that Total Annual Fund Operating Expenses, excluding certain investment related expenses, taxes, interest and other extraordinary expenses (including litigation), will not exceed 1.00% for Class I, 1.35% for Class A, 1.40% for Class L, 2.10% for Class C and 0.95% for Class IS. The fee waivers and/or expense reimbursements will continue for at least one year or until such time as the Company's Board of Directors acts to discontinue all or a portion of such waivers and/or reimbursements when it deems such action is appropriate. The Fund's "Distributor," Morgan Stanley Distribution, Inc., has agreed to waive for at least one year the 12b-1 fee on Class L shares of the Fund to the extent it exceeds 0.30% of the average daily net assets of such shares on an annualized basis.