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

Prospectus Supplement


June 15, 2017


Morgan Stanley Institutional Fund, Inc.


Supplement dated June 15, 2017 to the Morgan Stanley Institutional Fund, Inc. Prospectus dated May 1, 2017


Global Infrastructure Portfolio (the "Fund")


The maximum expense ratio of each share Class of the Fund has been increased, effective July 1, 2017. Accordingly, effective July 1, 2017, the Prospectus is hereby amended as follows:
Risk/Return [Heading] rr_RiskReturnHeading Global Infrastructure Portfolio
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

The Annual Fund Operating Expenses table under the section of the Prospectus entitled "Fund Summary—Global Infrastructure 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 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.
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

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 Infrastructure Portfolio | CLASS I  
Risk/Return: rr_RiskReturnAbstract  
Advisory Fee rr_ManagementFeesOverAssets 0.85%
Distribution and/or Shareholder Service (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.19%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.04% [1]
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.08% [1]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.96% [1]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 98
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 323
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 566
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,264
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 98
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 323
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 566
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,264
Global Infrastructure Portfolio | CLASS A  
Risk/Return: rr_RiskReturnAbstract  
Advisory Fee rr_ManagementFeesOverAssets 0.85%
Distribution and/or Shareholder Service (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.27%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.37% [1]
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.16% [1]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.21% [1]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 642
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 921
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,221
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,072
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 642
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 921
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,221
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,072
Global Infrastructure Portfolio | CLASS L  
Risk/Return: rr_RiskReturnAbstract  
Advisory Fee rr_ManagementFeesOverAssets 0.85%
Distribution and/or Shareholder Service (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets 0.75%
Other Expenses rr_OtherExpensesOverAssets 0.35%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.95% [1]
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.17% [1]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.78% [1]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 181
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 596
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,036
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,261
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 181
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 596
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,036
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,261
Global Infrastructure Portfolio | Class C  
Risk/Return: rr_RiskReturnAbstract  
Advisory Fee rr_ManagementFeesOverAssets 0.85%
Distribution and/or Shareholder Service (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses rr_OtherExpensesOverAssets 0.84%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.69% [1]
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.62% [1]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 2.07% [1]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 310
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 777
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,370
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,977
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 210
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 777
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,370
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,977
Global Infrastructure Portfolio | Class IS  
Risk/Return: rr_RiskReturnAbstract  
Advisory Fee rr_ManagementFeesOverAssets 0.85%
Distribution and/or Shareholder Service (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.23%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.08% [1]
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.14% [1]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.94% [1]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 96
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 330
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 582
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,305
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 96
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 330
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 582
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,305
[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 0.97% for Class I, 1.21% for Class A, 1.78% for Class L, 2.07% for Class C and 0.94% 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.