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

Prospectus Supplement


December 22, 2015


Morgan Stanley Institutional Fund, Inc.


Supplement dated December 22, 2015 to the Morgan Stanley Institutional Fund, Inc. Prospectus dated April 30, 2015


Global Opportunity Portfolio (the "Portfolio")
Risk/Return [Heading] rr_RiskReturnHeading Global Opportunity Portfolio
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

The Portfolio's Annual Portfolio Operating Expenses table under the section of the Prospectus entitled "Portfolio Summary—Global Opportunity Portfolio—Fees and Expenses—Annual Portfolio Operating Expenses" is hereby deleted in its entirety and replaced with the following:
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Portfolio Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

The Example information under the section of the Prospectus entitled "Portfolio Summary—Global Opportunity Portfolio—Fees and Expenses—Example" is hereby deleted in its entirety and replaced with the following:


Example


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


The example assumes that you invest $10,000 in the Portfolio, your investment has a 5% return each year and that the Portfolio's operating expenses remain the same. 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 1.57%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 2.37% [1]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (1.56%) [1]
Total Annual Portfolio Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.81% [1]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 83
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 259
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 450
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,002
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 83
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 259
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 450
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,002
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 1.71%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 2.76% [1]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (1.53%) [1]
Total Annual Portfolio Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.23% [1]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 644
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 895
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,165
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,935
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 644
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 895
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,165
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,935
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 1.87%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 3.42% [1]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (1.92%) [1]
Total Annual Portfolio Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.50% [1]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 153
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 474
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 818
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,791
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 153
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 474
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 818
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,791
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 1.87%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 3.67% [1]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (1.47%) [1]
Total Annual Portfolio Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 2.20% [1]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 323
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 688
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,180
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,534
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 223
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 688
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,180
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,534
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 18.60%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 19.40% [1]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (18.68%) [1]
Total Annual Portfolio Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.72% [1]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 74
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 230
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 401
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 894
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 74
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 230
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 401
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 894
[1] The Portfolio's "Adviser," Morgan Stanley Investment Management Inc., has agreed to reduce its advisory fee and/or reimburse the Portfolio so that Total Annual Portfolio Operating Expenses, excluding certain investment related expenses, taxes, interest and other extraordinary expenses (including litigation), will not exceed 0.81% for Class I, 1.23% for Class A, 1.50% for Class L, 2.20% for Class C and 0.72% for Class IS. The fee waivers and/or expense reimbursements will continue for at least two years from the date of the Global Opportunity Reorganization (as defined in the section of this Prospectus entitled "Fund Management-Advisory Fees") or until such time as the Fund'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 Portfolio's "Distributor," Morgan Stanley Distribution, Inc., has agreed to waive for at least one year from the date of the Global Opportunity Reorganization the 12b-1 fee on Class L shares of the Portfolio to the extent it exceeds 0.30% of the average daily net assets of such shares on an annualized basis.