This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Advantage Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

<span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: left;">www.morganstanley.com/im/shareholderreports</span>

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$59	1.18%

Expenses Paid, Amount

$ 59

Expense Ratio, Percent

1.18%

AssetsNet

$ 161,969,489

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

28.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$161,969,489
# of Portfolio Holdings	30
Portfolio Turnover Rate	28%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	1.3%
Investment Companies	2.5%
Real Estate	3.5%
Industrials	6.3%
Health Care	8.6%
Financials	8.7%
Communication Services	12.5%
Consumer Discretionary	27.9%
Information Technology	28.7%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000155898

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Advantage Portfolio

Class Name

Trading Symbol

MSPRX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Advantage Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$96	1.92%

Expenses Paid, Amount

$ 96

Expense Ratio, Percent

1.92%

AssetsNet

$ 161,969,489

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

28.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$161,969,489
# of Portfolio Holdings	30
Portfolio Turnover Rate	28%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	1.3%
Investment Companies	2.5%
Real Estate	3.5%
Industrials	6.3%
Health Care	8.6%
Financials	8.7%
Communication Services	12.5%
Consumer Discretionary	27.9%
Information Technology	28.7%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000085091

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Advantage Portfolio

Class Name

Trading Symbol

MPAIX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Advantage Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$43	0.85%

Expenses Paid, Amount

$ 43

Expense Ratio, Percent

0.85%

AssetsNet

$ 161,969,489

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

28.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$161,969,489
# of Portfolio Holdings	30
Portfolio Turnover Rate	28%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	1.3%
Investment Companies	2.5%
Real Estate	3.5%
Industrials	6.3%
Health Care	8.6%
Financials	8.7%
Communication Services	12.5%
Consumer Discretionary	27.9%
Information Technology	28.7%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000085092

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Advantage Portfolio

Class Name

Trading Symbol

MAPLX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Advantage Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class L	$50	0.99%

Expenses Paid, Amount

$ 50

Expense Ratio, Percent

0.99%

AssetsNet

$ 161,969,489

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

28.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$161,969,489
# of Portfolio Holdings	30
Portfolio Turnover Rate	28%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	1.3%
Investment Companies	2.5%
Real Estate	3.5%
Industrials	6.3%
Health Care	8.6%
Financials	8.7%
Communication Services	12.5%
Consumer Discretionary	27.9%
Information Technology	28.7%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000126919

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Advantage Portfolio

Class Name

Trading Symbol

MADSX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Advantage Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$41	0.81%

Expenses Paid, Amount

$ 41

Expense Ratio, Percent

0.81%

AssetsNet

$ 161,969,489

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

28.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$161,969,489
# of Portfolio Holdings	30
Portfolio Turnover Rate	28%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	1.3%
Investment Companies	2.5%
Real Estate	3.5%
Industrials	6.3%
Health Care	8.6%
Financials	8.7%
Communication Services	12.5%
Consumer Discretionary	27.9%
Information Technology	28.7%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000236926

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - American Resilience Portfolio

Class Name

Trading Symbol

MSCUX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - American Resilience Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$53	1.05%

Expenses Paid, Amount

$ 53

Expense Ratio, Percent

1.05%

AssetsNet

$ 1,194,575

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

21.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$1,194,575
# of Portfolio Holdings	35
Portfolio Turnover Rate	21%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	0.4%
Communication Services	4.7%
Consumer Staples	11.2%
Industrials	11.7%
Financials	21.1%
Health Care	24.6%
Information Technology	26.3%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000236923

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - American Resilience Portfolio

Class Name

Trading Symbol

MSBWX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - American Resilience Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$91	1.80%

Expenses Paid, Amount

$ 91

Expense Ratio, Percent

1.80%

AssetsNet

$ 1,194,575

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

21.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$1,194,575
# of Portfolio Holdings	35
Portfolio Turnover Rate	21%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	0.4%
Communication Services	4.7%
Consumer Staples	11.2%
Industrials	11.7%
Financials	21.1%
Health Care	24.6%
Information Technology	26.3%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000236924

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - American Resilience Portfolio

Class Name

Trading Symbol

MSBVX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - American Resilience Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$36	0.70%

Expenses Paid, Amount

$ 36

Expense Ratio, Percent

0.70%

AssetsNet

$ 1,194,575

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

21.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$1,194,575
# of Portfolio Holdings	35
Portfolio Turnover Rate	21%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	0.4%
Communication Services	4.7%
Consumer Staples	11.2%
Industrials	11.7%
Financials	21.1%
Health Care	24.6%
Information Technology	26.3%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000236925

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - American Resilience Portfolio

Class Name

Trading Symbol

MSBQX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - American Resilience Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$33	0.65%

Expenses Paid, Amount

$ 33

Expense Ratio, Percent

0.65%

AssetsNet

$ 1,194,575

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

21.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$1,194,575
# of Portfolio Holdings	35
Portfolio Turnover Rate	21%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	0.4%
Communication Services	4.7%
Consumer Staples	11.2%
Industrials	11.7%
Financials	21.1%
Health Care	24.6%
Information Technology	26.3%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000163121

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Asia Opportunity Portfolio

Class Name

Trading Symbol

MSAUX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Asia Opportunity Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$73	1.43%

Expenses Paid, Amount

$ 73

Expense Ratio, Percent

1.43%

AssetsNet

$ 130,899,988

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

9.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$130,899,988
# of Portfolio Holdings	32
Portfolio Turnover Rate	9%

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
United States	1.4%
Hong Kong	2.0%
Singapore	3.9%
Taiwan	5.9%
Korea, Republic Of	11.5%
India	28.3%
China	47.0%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000163122

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Asia Opportunity Portfolio

Class Name

Trading Symbol

MSAWX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Asia Opportunity Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$111	2.17%

Expenses Paid, Amount

$ 111

Expense Ratio, Percent

2.17%

AssetsNet

$ 130,899,988

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

9.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$130,899,988
# of Portfolio Holdings	32
Portfolio Turnover Rate	9%

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
United States	1.4%
Hong Kong	2.0%
Singapore	3.9%
Taiwan	5.9%
Korea, Republic Of	11.5%
India	28.3%
China	47.0%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000163120

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Asia Opportunity Portfolio

Class Name

Trading Symbol

MSAQX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Asia Opportunity Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$56	1.10%

Expenses Paid, Amount

$ 56

Expense Ratio, Percent

1.10%

AssetsNet

$ 130,899,988

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

9.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$130,899,988
# of Portfolio Holdings	32
Portfolio Turnover Rate	9%

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
United States	1.4%
Hong Kong	2.0%
Singapore	3.9%
Taiwan	5.9%
Korea, Republic Of	11.5%
India	28.3%
China	47.0%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000163123

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Asia Opportunity Portfolio

Class Name

Trading Symbol

MSAYX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Asia Opportunity Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$54	1.05%

Expenses Paid, Amount

$ 54

Expense Ratio, Percent

1.05%

AssetsNet

$ 130,899,988

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

9.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$130,899,988
# of Portfolio Holdings	32
Portfolio Turnover Rate	9%

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
United States	1.4%
Hong Kong	2.0%
Singapore	3.9%
Taiwan	5.9%
Korea, Republic Of	11.5%
India	28.3%
China	47.0%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000195878

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc - Counterpoint Global Portfolio

Class Name

Trading Symbol

GLCAX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc - Counterpoint Global Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Material Fund Change Notice [Text Block]

This report describes changes to the Fund that occurred during the reporting period.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$70	1.39%

Expenses Paid, Amount

$ 70

Expense Ratio, Percent

1.39%

Material Change Date

Jun. 30, 2024

AssetsNet

$ 10,042,729

Holdings Count | Holding

216

InvestmentCompanyPortfolioTurnover

51.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$10,042,729
# of Portfolio Holdings	216
Portfolio Turnover Rate	51%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Utilities	0.1%
Real Estate	0.1%
Materials	0.3%
Energy	0.5%
Consumer Staples	0.5%
Investment Companies	2.1%
Short-Term Investments	3.3%
Communication Services	4.8%
Financials	4.8%
Industrials	6.7%
Health Care	15.3%
Information Technology	29.7%
Consumer Discretionary	31.8%

Material Fund Change [Text Block]

Material Fund Changes

This is a summary of certain changes of the Fund since June 30, 2024

The Board of Directors of Morgan Stanley Institutional Fund, Inc. (the “Company”) approved a Plan of Liquidation with respect to the Fund, a portfolio of common stock of the Company. Pursuant to the Plan of Liquidation, the assets of the Fund were liquidated, known or reasonable ascertainable liabilities of the Fund were satisfied, the remaining proceeds were distributed to the Fund’s shareholders and all the issued and outstanding shares of the Fund were redeemed (the “Liquidation”). The Liquidation occurred on July 22, 2024.

Summary of Change Legend [Text Block]

This is a summary of certain changes of the Fund since June 30, 2024

Updated Prospectus Web Address

C000195879

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc - Counterpoint Global Portfolio

Class Name

Trading Symbol

GLCDX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc - Counterpoint Global Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Material Fund Change Notice [Text Block]

This report describes changes to the Fund that occurred during the reporting period.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$107	2.14%

Expenses Paid, Amount

$ 107

Expense Ratio, Percent

2.14%

Material Change Date

Jun. 30, 2024

AssetsNet

$ 10,042,729

Holdings Count | Holding

216

InvestmentCompanyPortfolioTurnover

51.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$10,042,729
# of Portfolio Holdings	216
Portfolio Turnover Rate	51%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Utilities	0.1%
Real Estate	0.1%
Materials	0.3%
Energy	0.5%
Consumer Staples	0.5%
Investment Companies	2.1%
Short-Term Investments	3.3%
Communication Services	4.8%
Financials	4.8%
Industrials	6.7%
Health Care	15.3%
Information Technology	29.7%
Consumer Discretionary	31.8%

Material Fund Change [Text Block]

Material Fund Changes

This is a summary of certain changes of the Fund since June 30, 2024

Summary of Change Legend [Text Block]

This is a summary of certain changes of the Fund since June 30, 2024

Updated Prospectus Web Address

C000195880

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc - Counterpoint Global Portfolio

Class Name

Trading Symbol

GLCIX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc - Counterpoint Global Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Material Fund Change Notice [Text Block]

This report describes changes to the Fund that occurred during the reporting period.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$52	1.04%

Expenses Paid, Amount

$ 52

Expense Ratio, Percent

1.04%

Material Change Date

Jun. 30, 2024

AssetsNet

$ 10,042,729

Holdings Count | Holding

216

InvestmentCompanyPortfolioTurnover

51.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$10,042,729
# of Portfolio Holdings	216
Portfolio Turnover Rate	51%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Utilities	0.1%
Real Estate	0.1%
Materials	0.3%
Energy	0.5%
Consumer Staples	0.5%
Investment Companies	2.1%
Short-Term Investments	3.3%
Communication Services	4.8%
Financials	4.8%
Industrials	6.7%
Health Care	15.3%
Information Technology	29.7%
Consumer Discretionary	31.8%

Material Fund Change [Text Block]

Material Fund Changes

This is a summary of certain changes of the Fund since June 30, 2024

Summary of Change Legend [Text Block]

This is a summary of certain changes of the Fund since June 30, 2024

Updated Prospectus Web Address

C000195881

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc - Counterpoint Global Portfolio

Class Name

Trading Symbol

GLCSX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc - Counterpoint Global Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Material Fund Change Notice [Text Block]

This report describes changes to the Fund that occurred during the reporting period.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$50	0.99%

Expenses Paid, Amount

$ 50

Expense Ratio, Percent

0.99%

Material Change Date

Jun. 30, 2024

AssetsNet

$ 10,042,729

Holdings Count | Holding

216

InvestmentCompanyPortfolioTurnover

51.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$10,042,729
# of Portfolio Holdings	216
Portfolio Turnover Rate	51%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Utilities	0.1%
Real Estate	0.1%
Materials	0.3%
Energy	0.5%
Consumer Staples	0.5%
Investment Companies	2.1%
Short-Term Investments	3.3%
Communication Services	4.8%
Financials	4.8%
Industrials	6.7%
Health Care	15.3%
Information Technology	29.7%
Consumer Discretionary	31.8%

Material Fund Change [Text Block]

Material Fund Changes

This is a summary of certain changes of the Fund since June 30, 2024

Summary of Change Legend [Text Block]

This is a summary of certain changes of the Fund since June 30, 2024

Updated Prospectus Web Address

C000216355

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Developing Opportunity Portfolio

Class Name

Trading Symbol

MDOAX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Developing Opportunity Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$76	1.47%

Expenses Paid, Amount

$ 76

Expense Ratio, Percent

1.47%

AssetsNet

$ 32,286,126

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

22.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$32,286,126
# of Portfolio Holdings	34
Portfolio Turnover Rate	22%

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Poland	1.4%
Argentina	1.8%
Singapore	3.7%
Brazil	4.8%
Taiwan	5.8%
United States	9.5%
Korea, Republic Of	10.9%
India	25.6%
China	36.5%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000216357

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Developing Opportunity Portfolio

Class Name

Trading Symbol

MDOBX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Developing Opportunity Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$116	2.25%

Expenses Paid, Amount

$ 116

Expense Ratio, Percent

2.25%

AssetsNet

$ 32,286,126

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

22.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$32,286,126
# of Portfolio Holdings	34
Portfolio Turnover Rate	22%

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Poland	1.4%
Argentina	1.8%
Singapore	3.7%
Brazil	4.8%
Taiwan	5.8%
United States	9.5%
Korea, Republic Of	10.9%
India	25.6%
China	36.5%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000216354

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Developing Opportunity Portfolio

Class Name

Trading Symbol

MDOEX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Developing Opportunity Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$59	1.15%

Expenses Paid, Amount

$ 59

Expense Ratio, Percent

1.15%

AssetsNet

$ 32,286,126

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

22.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$32,286,126
# of Portfolio Holdings	34
Portfolio Turnover Rate	22%

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Poland	1.4%
Argentina	1.8%
Singapore	3.7%
Brazil	4.8%
Taiwan	5.8%
United States	9.5%
Korea, Republic Of	10.9%
India	25.6%
China	36.5%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000216356

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Developing Opportunity Portfolio

Class Name

Trading Symbol

MDODX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Developing Opportunity Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$57	1.10%

Expenses Paid, Amount

$ 57

Expense Ratio, Percent

1.10%

AssetsNet

$ 32,286,126

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

22.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$32,286,126
# of Portfolio Holdings	34
Portfolio Turnover Rate	22%

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Poland	1.4%
Argentina	1.8%
Singapore	3.7%
Brazil	4.8%
Taiwan	5.8%
United States	9.5%
Korea, Republic Of	10.9%
India	25.6%
China	36.5%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000236912

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Emerging Markets ex China Portfolio

Class Name

Trading Symbol

MSDQX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Emerging Markets ex China Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$71	1.35%

Expenses Paid, Amount

$ 71

Expense Ratio, Percent

1.35%

AssetsNet

$ 7,457,096

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

14.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$7,457,096
# of Portfolio Holdings	78
Portfolio Turnover Rate	14%

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other^{Footnote Reference1}	3.5%
Sweden	1.2%
Saudi Arabia	1.5%
United Kingdom	1.7%
Thailand	1.8%
Poland	3.8%
Indonesia	3.9%
South Africa	4.5%
Mexico	5.5%
Brazil	6.0%
Korea, Republic Of	14.3%
Taiwan	21.9%
India	30.4%

Footnote	Description
Footnote¹	Represents investments in countries less than 1% of total investments.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000236913

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Emerging Markets ex China Portfolio

Class Name

Trading Symbol

MSDOX

Annual or Semi-Annual Statement [Text Block]

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$111	2.10%

Expenses Paid, Amount

$ 111

Expense Ratio, Percent

2.10%

AssetsNet

$ 7,457,096

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

14.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$7,457,096
# of Portfolio Holdings	78
Portfolio Turnover Rate	14%

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other^{Footnote Reference1}	3.5%
Sweden	1.2%
Saudi Arabia	1.5%
United Kingdom	1.7%
Thailand	1.8%
Poland	3.8%
Indonesia	3.9%
South Africa	4.5%
Mexico	5.5%
Brazil	6.0%
Korea, Republic Of	14.3%
Taiwan	21.9%
India	30.4%

Footnote	Description
Footnote¹	Represents investments in countries less than 1% of total investments.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000236914

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Emerging Markets ex China Portfolio

Class Name

Trading Symbol

MSDUX

Annual or Semi-Annual Statement [Text Block]

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$52	0.98%

Expenses Paid, Amount

$ 52

Expense Ratio, Percent

0.98%

AssetsNet

$ 7,457,096

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

14.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$7,457,096
# of Portfolio Holdings	78
Portfolio Turnover Rate	14%

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other^{Footnote Reference1}	3.5%
Sweden	1.2%
Saudi Arabia	1.5%
United Kingdom	1.7%
Thailand	1.8%
Poland	3.8%
Indonesia	3.9%
South Africa	4.5%
Mexico	5.5%
Brazil	6.0%
Korea, Republic Of	14.3%
Taiwan	21.9%
India	30.4%

Footnote	Description
Footnote¹	Represents investments in countries less than 1% of total investments.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000236911

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Emerging Markets ex China Portfolio

Class Name

Trading Symbol

MSDMX

Annual or Semi-Annual Statement [Text Block]

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$50	0.95%

Expenses Paid, Amount

$ 50

Expense Ratio, Percent

0.95%

AssetsNet

$ 7,457,096

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

14.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$7,457,096
# of Portfolio Holdings	78
Portfolio Turnover Rate	14%

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other^{Footnote Reference1}	3.5%
Sweden	1.2%
Saudi Arabia	1.5%
United Kingdom	1.7%
Thailand	1.8%
Poland	3.8%
Indonesia	3.9%
South Africa	4.5%
Mexico	5.5%
Brazil	6.0%
Korea, Republic Of	14.3%
Taiwan	21.9%
India	30.4%

Footnote	Description
Footnote¹	Represents investments in countries less than 1% of total investments.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000149048

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Emerging Markets Leaders Portfolio

Class Name

Trading Symbol

MELAX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Emerging Markets Leaders Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$72	1.39%

Expenses Paid, Amount

$ 72

Expense Ratio, Percent

1.39%

AssetsNet

$ 243,956,048

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

27.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$243,956,048
# of Portfolio Holdings	39
Portfolio Turnover Rate	27%

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other^{Footnote Reference1}	0.3%
China	1.9%
Mexico	3.6%
Argentina	3.6%
Korea, Republic Of	4.4%
United States	7.9%
Brazil	13.8%
Taiwan	14.8%
India	49.7%

Footnote	Description
Footnote¹	Represents investments in countries less than 1% of total investments.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000155912

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Emerging Markets Leaders Portfolio

Class Name

Trading Symbol

MEMLX

Annual or Semi-Annual Statement [Text Block]

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$111	2.15%

Expenses Paid, Amount

$ 111

Expense Ratio, Percent

2.15%

AssetsNet

$ 243,956,048

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

27.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$243,956,048
# of Portfolio Holdings	39
Portfolio Turnover Rate	27%

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other^{Footnote Reference1}	0.3%
China	1.9%
Mexico	3.6%
Argentina	3.6%
Korea, Republic Of	4.4%
United States	7.9%
Brazil	13.8%
Taiwan	14.8%
India	49.7%

Footnote	Description
Footnote¹	Represents investments in countries less than 1% of total investments.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000149047

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Emerging Markets Leaders Portfolio

Class Name

Trading Symbol

MELIX

Annual or Semi-Annual Statement [Text Block]

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$54	1.05%

Expenses Paid, Amount

$ 54

Expense Ratio, Percent

1.05%

AssetsNet

$ 243,956,048

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

27.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$243,956,048
# of Portfolio Holdings	39
Portfolio Turnover Rate	27%

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other^{Footnote Reference1}	0.3%
China	1.9%
Mexico	3.6%
Argentina	3.6%
Korea, Republic Of	4.4%
United States	7.9%
Brazil	13.8%
Taiwan	14.8%
India	49.7%

Footnote	Description
Footnote¹	Represents investments in countries less than 1% of total investments.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000226932

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Emerging Markets Leaders Portfolio

Class Name

Trading Symbol

MSIWX

Annual or Semi-Annual Statement [Text Block]

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class IR	$51	0.99%

Expenses Paid, Amount

$ 51

Expense Ratio, Percent

0.99%

AssetsNet

$ 243,956,048

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

27.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$243,956,048
# of Portfolio Holdings	39
Portfolio Turnover Rate	27%

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other^{Footnote Reference1}	0.3%
China	1.9%
Mexico	3.6%
Argentina	3.6%
Korea, Republic Of	4.4%
United States	7.9%
Brazil	13.8%
Taiwan	14.8%
India	49.7%

Footnote	Description
Footnote¹	Represents investments in countries less than 1% of total investments.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000149050

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Emerging Markets Leaders Portfolio

Class Name

Trading Symbol

MELSX

Annual or Semi-Annual Statement [Text Block]

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$51	0.99%

Expenses Paid, Amount

$ 51

Expense Ratio, Percent

0.99%

AssetsNet

$ 243,956,048

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

27.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$243,956,048
# of Portfolio Holdings	39
Portfolio Turnover Rate	27%

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other^{Footnote Reference1}	0.3%
China	1.9%
Mexico	3.6%
Argentina	3.6%
Korea, Republic Of	4.4%
United States	7.9%
Brazil	13.8%
Taiwan	14.8%
India	49.7%

Footnote	Description
Footnote¹	Represents investments in countries less than 1% of total investments.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000007747

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Emerging Markets Portfolio

Class Name

Trading Symbol

MMKBX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Emerging Markets Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$71	1.35%

Expenses Paid, Amount

$ 71

Expense Ratio, Percent

1.35%

AssetsNet

$ 531,354,483

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

20.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$531,354,483
# of Portfolio Holdings	99
Portfolio Turnover Rate	20%

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other^{Footnote Reference1}	0.7%
United Kingdom	1.2%
Thailand	1.5%
Saudi Arabia	1.6%
United States	1.7%
Poland	2.5%
Indonesia	2.9%
South Africa	3.3%
Mexico	4.6%
Brazil	5.9%
Korea, Republic Of	11.5%
Taiwan	18.5%
China	19.1%
India	25.0%

Footnote	Description
Footnote¹	Represents investments in countries less than 1% of total investments.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000155890

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Emerging Markets Portfolio

Class Name

Trading Symbol

MSEPX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Emerging Markets Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$110	2.10%

Expenses Paid, Amount

$ 110

Expense Ratio, Percent

2.10%

AssetsNet

$ 531,354,483

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

20.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$531,354,483
# of Portfolio Holdings	99
Portfolio Turnover Rate	20%

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other^{Footnote Reference1}	0.7%
United Kingdom	1.2%
Thailand	1.5%
Saudi Arabia	1.6%
United States	1.7%
Poland	2.5%
Indonesia	2.9%
South Africa	3.3%
Mexico	4.6%
Brazil	5.9%
Korea, Republic Of	11.5%
Taiwan	18.5%
China	19.1%
India	25.0%

Footnote	Description
Footnote¹	Represents investments in countries less than 1% of total investments.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000007746

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Emerging Markets Portfolio

Class Name

Trading Symbol

MGEMX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Emerging Markets Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$52	0.99%

Expenses Paid, Amount

$ 52

Expense Ratio, Percent

0.99%

AssetsNet

$ 531,354,483

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

20.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$531,354,483
# of Portfolio Holdings	99
Portfolio Turnover Rate	20%

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other^{Footnote Reference1}	0.7%
United Kingdom	1.2%
Thailand	1.5%
Saudi Arabia	1.6%
United States	1.7%
Poland	2.5%
Indonesia	2.9%
South Africa	3.3%
Mexico	4.6%
Brazil	5.9%
Korea, Republic Of	11.5%
Taiwan	18.5%
China	19.1%
India	25.0%

Footnote	Description
Footnote¹	Represents investments in countries less than 1% of total investments.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000198815

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Emerging Markets Portfolio

Class Name

Trading Symbol

MRGEX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Emerging Markets Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class IR	$50	0.95%

Expenses Paid, Amount

$ 50

Expense Ratio, Percent

0.95%

AssetsNet

$ 531,354,483

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

20.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$531,354,483
# of Portfolio Holdings	99
Portfolio Turnover Rate	20%

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other^{Footnote Reference1}	0.7%
United Kingdom	1.2%
Thailand	1.5%
Saudi Arabia	1.6%
United States	1.7%
Poland	2.5%
Indonesia	2.9%
South Africa	3.3%
Mexico	4.6%
Brazil	5.9%
Korea, Republic Of	11.5%
Taiwan	18.5%
China	19.1%
India	25.0%

Footnote	Description
Footnote¹	Represents investments in countries less than 1% of total investments.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000113803

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Emerging Markets Portfolio

Class Name

Trading Symbol

MSELX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Emerging Markets Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class L	$97	1.85%

Expenses Paid, Amount

$ 97

Expense Ratio, Percent

1.85%

AssetsNet

$ 531,354,483

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

20.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$531,354,483
# of Portfolio Holdings	99
Portfolio Turnover Rate	20%

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other^{Footnote Reference1}	0.7%
United Kingdom	1.2%
Thailand	1.5%
Saudi Arabia	1.6%
United States	1.7%
Poland	2.5%
Indonesia	2.9%
South Africa	3.3%
Mexico	4.6%
Brazil	5.9%
Korea, Republic Of	11.5%
Taiwan	18.5%
China	19.1%
India	25.0%

Footnote	Description
Footnote¹	Represents investments in countries less than 1% of total investments.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000126912

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Emerging Markets Portfolio

Class Name

Trading Symbol

MMMPX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Emerging Markets Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$50	0.95%

Expenses Paid, Amount

$ 50

Expense Ratio, Percent

0.95%

AssetsNet

$ 531,354,483

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

20.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$531,354,483
# of Portfolio Holdings	99
Portfolio Turnover Rate	20%

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other^{Footnote Reference1}	0.7%
United Kingdom	1.2%
Thailand	1.5%
Saudi Arabia	1.6%
United States	1.7%
Poland	2.5%
Indonesia	2.9%
South Africa	3.3%
Mexico	4.6%
Brazil	5.9%
Korea, Republic Of	11.5%
Taiwan	18.5%
China	19.1%
India	25.0%

Footnote	Description
Footnote¹	Represents investments in countries less than 1% of total investments.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000169209

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc - Global Concentrated Portfolio

Class Name

Trading Symbol

MLNAX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc - Global Concentrated Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$72	1.28%

Expenses Paid, Amount

$ 72

Expense Ratio, Percent

1.28%

AssetsNet

$ 194,402,885

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

19.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$194,402,885
# of Portfolio Holdings	21
Portfolio Turnover Rate	19%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	1.1%
Utilities	1.9%
Materials	5.9%
Consumer Staples	6.0%
Consumer Discretionary	6.9%
Communication Services	7.1%
Health Care	7.8%
Industrials	13.7%
Financials	20.9%
Information Technology	28.7%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000169210

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc - Global Concentrated Portfolio

Class Name

Trading Symbol

MLNCX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc - Global Concentrated Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$116	2.06%

Expenses Paid, Amount

$ 116

Expense Ratio, Percent

2.06%

AssetsNet

$ 194,402,885

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

19.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$194,402,885
# of Portfolio Holdings	21
Portfolio Turnover Rate	19%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	1.1%
Utilities	1.9%
Materials	5.9%
Consumer Staples	6.0%
Consumer Discretionary	6.9%
Communication Services	7.1%
Health Care	7.8%
Industrials	13.7%
Financials	20.9%
Information Technology	28.7%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000169208

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc - Global Concentrated Portfolio

Class Name

Trading Symbol

MLNIX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc - Global Concentrated Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$57	1.00%

Expenses Paid, Amount

$ 57

Expense Ratio, Percent

1.00%

AssetsNet

$ 194,402,885

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

19.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$194,402,885
# of Portfolio Holdings	21
Portfolio Turnover Rate	19%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	1.1%
Utilities	1.9%
Materials	5.9%
Consumer Staples	6.0%
Consumer Discretionary	6.9%
Communication Services	7.1%
Health Care	7.8%
Industrials	13.7%
Financials	20.9%
Information Technology	28.7%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000169211

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc - Global Concentrated Portfolio

Class Name

Trading Symbol

MLNSX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc - Global Concentrated Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$54	0.95%

Expenses Paid, Amount

$ 54

Expense Ratio, Percent

0.95%

AssetsNet

$ 194,402,885

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

19.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$194,402,885
# of Portfolio Holdings	21
Portfolio Turnover Rate	19%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	1.1%
Utilities	1.9%
Materials	5.9%
Consumer Staples	6.0%
Consumer Discretionary	6.9%
Communication Services	7.1%
Health Care	7.8%
Industrials	13.7%
Financials	20.9%
Information Technology	28.7%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000169213

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Core Portfolio

Class Name

Trading Symbol

MLMAX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Core Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$70	1.30%

Expenses Paid, Amount

$ 70

Expense Ratio, Percent

1.30%

AssetsNet

$ 32,697,052

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

22.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$32,697,052
# of Portfolio Holdings	47
Portfolio Turnover Rate	22%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	0.1%
Consumer Staples	0.6%
Utilities	1.2%
Energy	3.1%
Health Care	4.7%
Materials	7.9%
Communication Services	9.4%
Industrials	10.6%
Consumer Discretionary	16.1%
Financials	20.5%
Information Technology	25.8%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000169214

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Core Portfolio

Class Name

Trading Symbol

MLMCX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Core Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$113	2.10%

Expenses Paid, Amount

$ 113

Expense Ratio, Percent

2.10%

AssetsNet

$ 32,697,052

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

22.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$32,697,052
# of Portfolio Holdings	47
Portfolio Turnover Rate	22%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	0.1%
Consumer Staples	0.6%
Utilities	1.2%
Energy	3.1%
Health Care	4.7%
Materials	7.9%
Communication Services	9.4%
Industrials	10.6%
Consumer Discretionary	16.1%
Financials	20.5%
Information Technology	25.8%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000169212

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Core Portfolio

Class Name

Trading Symbol

MLMIX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Core Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$54	1.00%

Expenses Paid, Amount

$ 54

Expense Ratio, Percent

1.00%

AssetsNet

$ 32,697,052

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

22.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$32,697,052
# of Portfolio Holdings	47
Portfolio Turnover Rate	22%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	0.1%
Consumer Staples	0.6%
Utilities	1.2%
Energy	3.1%
Health Care	4.7%
Materials	7.9%
Communication Services	9.4%
Industrials	10.6%
Consumer Discretionary	16.1%
Financials	20.5%
Information Technology	25.8%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000169215

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Core Portfolio

Class Name

Trading Symbol

MLMSX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Core Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$51	0.95%

Expenses Paid, Amount

$ 51

Expense Ratio, Percent

0.95%

AssetsNet

$ 32,697,052

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

22.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$32,697,052
# of Portfolio Holdings	47
Portfolio Turnover Rate	22%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	0.1%
Consumer Staples	0.6%
Utilities	1.2%
Energy	3.1%
Health Care	4.7%
Materials	7.9%
Communication Services	9.4%
Industrials	10.6%
Consumer Discretionary	16.1%
Financials	20.5%
Information Technology	25.8%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000204518

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc - Global Endurance Portfolio

Class Name

Trading Symbol

MSJAX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc - Global Endurance Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$65	1.34%

Expenses Paid, Amount

$ 65

Expense Ratio, Percent

1.34%

AssetsNet

$ 38,581,393

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

86.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$38,581,393
# of Portfolio Holdings	30
Portfolio Turnover Rate	86%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	0.3%
Communication Services	1.2%
Financials	7.7%
Industrials	8.4%
Health Care	18.7%
Information Technology	21.2%
Consumer Discretionary	42.5%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000204519

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc - Global Endurance Portfolio

Class Name

Trading Symbol

MSJCX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc - Global Endurance Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$101	2.09%

Expenses Paid, Amount

$ 101

Expense Ratio, Percent

2.09%

AssetsNet

$ 38,581,393

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

86.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$38,581,393
# of Portfolio Holdings	30
Portfolio Turnover Rate	86%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	0.3%
Communication Services	1.2%
Financials	7.7%
Industrials	8.4%
Health Care	18.7%
Information Technology	21.2%
Consumer Discretionary	42.5%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000204520

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc - Global Endurance Portfolio

Class Name

Trading Symbol

MSJIX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc - Global Endurance Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$48	0.99%

Expenses Paid, Amount

$ 48

Expense Ratio, Percent

0.99%

AssetsNet

$ 38,581,393

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

86.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$38,581,393
# of Portfolio Holdings	30
Portfolio Turnover Rate	86%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	0.3%
Communication Services	1.2%
Financials	7.7%
Industrials	8.4%
Health Care	18.7%
Information Technology	21.2%
Consumer Discretionary	42.5%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000204517

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc - Global Endurance Portfolio

Class Name

Trading Symbol

MSJSX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc - Global Endurance Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$46	0.94%

Expenses Paid, Amount

$ 46

Expense Ratio, Percent

0.94%

AssetsNet

$ 38,581,393

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

86.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$38,581,393
# of Portfolio Holdings	30
Portfolio Turnover Rate	86%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	0.3%
Communication Services	1.2%
Financials	7.7%
Industrials	8.4%
Health Care	18.7%
Information Technology	21.2%
Consumer Discretionary	42.5%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000228807

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Focus Real Estate Portfolio

Class Name

Trading Symbol

MSBEX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Focus Real Estate Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$60	1.20%

Expenses Paid, Amount

$ 60

Expense Ratio, Percent

1.20%

AssetsNet

$ 4,295,125

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

53.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$4,295,125
# of Portfolio Holdings	52
Portfolio Turnover Rate	53%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	0.3%
Consumer Discretionary	1.0%
Health Care	3.1%
Real Estate	39.9%
Financials	55.7%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000228808

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Focus Real Estate Portfolio

Class Name

Trading Symbol

MSBKX

Annual or Semi-Annual Statement [Text Block]

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$97	1.95%

Expenses Paid, Amount

$ 97

Expense Ratio, Percent

1.95%

AssetsNet

$ 4,295,125

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

53.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$4,295,125
# of Portfolio Holdings	52
Portfolio Turnover Rate	53%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	0.3%
Consumer Discretionary	1.0%
Health Care	3.1%
Real Estate	39.9%
Financials	55.7%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000228809

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Focus Real Estate Portfolio

Class Name

Trading Symbol

MSBDX

Annual or Semi-Annual Statement [Text Block]

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$42	0.85%

Expenses Paid, Amount

$ 42

Expense Ratio, Percent

0.85%

AssetsNet

$ 4,295,125

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

53.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$4,295,125
# of Portfolio Holdings	52
Portfolio Turnover Rate	53%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	0.3%
Consumer Discretionary	1.0%
Health Care	3.1%
Real Estate	39.9%
Financials	55.7%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000228806

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Focus Real Estate Portfolio

Class Name

Trading Symbol

MSBPX

Annual or Semi-Annual Statement [Text Block]

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$40	0.80%

Expenses Paid, Amount

$ 40

Expense Ratio, Percent

0.80%

AssetsNet

$ 4,295,125

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

53.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$4,295,125
# of Portfolio Holdings	52
Portfolio Turnover Rate	53%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	0.3%
Consumer Discretionary	1.0%
Health Care	3.1%
Real Estate	39.9%
Financials	55.7%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000007755

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Franchise Portfolio

Class Name

Trading Symbol

MSFBX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Franchise Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$58	1.16%

Expenses Paid, Amount

$ 58

Expense Ratio, Percent

1.16%

AssetsNet

$ 2,777,866,211

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

14.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$2,777,866,211
# of Portfolio Holdings	41
Portfolio Turnover Rate	14%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Communication Services	0.9%
Consumer Discretionary	1.4%
Short-Term Investments	1.5%
Industrials	12.5%
Financials	13.9%
Health Care	18.2%
Consumer Staples	19.0%
Information Technology	32.6%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000155893

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Franchise Portfolio

Class Name

Trading Symbol

MSGFX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Franchise Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$96	1.90%

Expenses Paid, Amount

$ 96

Expense Ratio, Percent

1.90%

AssetsNet

$ 2,777,866,211

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

14.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$2,777,866,211
# of Portfolio Holdings	41
Portfolio Turnover Rate	14%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Communication Services	0.9%
Consumer Discretionary	1.4%
Short-Term Investments	1.5%
Industrials	12.5%
Financials	13.9%
Health Care	18.2%
Consumer Staples	19.0%
Information Technology	32.6%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000007754

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Franchise Portfolio

Class Name

Trading Symbol

MSFAX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Franchise Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$46	0.92%

Expenses Paid, Amount

$ 46

Expense Ratio, Percent

0.92%

AssetsNet

$ 2,777,866,211

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

14.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$2,777,866,211
# of Portfolio Holdings	41
Portfolio Turnover Rate	14%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Communication Services	0.9%
Consumer Discretionary	1.4%
Short-Term Investments	1.5%
Industrials	12.5%
Financials	13.9%
Health Care	18.2%
Consumer Staples	19.0%
Information Technology	32.6%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000113809

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Franchise Portfolio

Class Name

Trading Symbol

MSFLX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Franchise Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class L	$84	1.66%

Expenses Paid, Amount

$ 84

Expense Ratio, Percent

1.66%

AssetsNet

$ 2,777,866,211

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

14.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$2,777,866,211
# of Portfolio Holdings	41
Portfolio Turnover Rate	14%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Communication Services	0.9%
Consumer Discretionary	1.4%
Short-Term Investments	1.5%
Industrials	12.5%
Financials	13.9%
Health Care	18.2%
Consumer Staples	19.0%
Information Technology	32.6%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000156276

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Franchise Portfolio

Class Name

Trading Symbol

MGISX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Franchise Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$42	0.83%

Expenses Paid, Amount

$ 42

Expense Ratio, Percent

0.83%

AssetsNet

$ 2,777,866,211

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

14.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$2,777,866,211
# of Portfolio Holdings	41
Portfolio Turnover Rate	14%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Communication Services	0.9%
Consumer Discretionary	1.4%
Short-Term Investments	1.5%
Industrials	12.5%
Financials	13.9%
Health Care	18.2%
Consumer Staples	19.0%
Information Technology	32.6%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000091818

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Infrastructure Portfolio

Class Name

Trading Symbol

MTIPX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Infrastructure Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$60	1.21%

Expenses Paid, Amount

$ 60

Expense Ratio, Percent

1.21%

AssetsNet

$ 238,492,324

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

24.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$238,492,324
# of Portfolio Holdings	58
Portfolio Turnover Rate	24%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Communication Services	3.2%
Short-Term Investments	4.0%
Financials	9.3%
Industrials	17.7%
Energy	25.7%
Utilities	40.1%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000155901

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Infrastructure Portfolio

Class Name

Trading Symbol

MSGTX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Infrastructure Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$102	2.07%

Expenses Paid, Amount

$ 102

Expense Ratio, Percent

2.07%

AssetsNet

$ 238,492,324

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

24.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$238,492,324
# of Portfolio Holdings	58
Portfolio Turnover Rate	24%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Communication Services	3.2%
Short-Term Investments	4.0%
Financials	9.3%
Industrials	17.7%
Energy	25.7%
Utilities	40.1%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000091816

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Infrastructure Portfolio

Class Name

Trading Symbol

MTIIX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Infrastructure Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$48	0.97%

Expenses Paid, Amount

$ 48

Expense Ratio, Percent

0.97%

AssetsNet

$ 238,492,324

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

24.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$238,492,324
# of Portfolio Holdings	58
Portfolio Turnover Rate	24%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Communication Services	3.2%
Short-Term Investments	4.0%
Financials	9.3%
Industrials	17.7%
Energy	25.7%
Utilities	40.1%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000198823

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Infrastructure Portfolio

Class Name

Trading Symbol

MRGOX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Infrastructure Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class IR	$47	0.94%

Expenses Paid, Amount

$ 47

Expense Ratio, Percent

0.94%

AssetsNet

$ 238,492,324

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

24.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$238,492,324
# of Portfolio Holdings	58
Portfolio Turnover Rate	24%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Communication Services	3.2%
Short-Term Investments	4.0%
Financials	9.3%
Industrials	17.7%
Energy	25.7%
Utilities	40.1%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000091817

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Infrastructure Portfolio

Class Name

Trading Symbol

MTILX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Infrastructure Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class L	$88	1.78%

Expenses Paid, Amount

$ 88

Expense Ratio, Percent

1.78%

AssetsNet

$ 238,492,324

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

24.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$238,492,324
# of Portfolio Holdings	58
Portfolio Turnover Rate	24%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Communication Services	3.2%
Short-Term Investments	4.0%
Financials	9.3%
Industrials	17.7%
Energy	25.7%
Utilities	40.1%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000126922

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Infrastructure Portfolio

Class Name

Trading Symbol

MSGPX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Infrastructure Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$47	0.94%

Expenses Paid, Amount

$ 47

Expense Ratio, Percent

0.94%

AssetsNet

$ 238,492,324

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

24.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$238,492,324
# of Portfolio Holdings	58
Portfolio Turnover Rate	24%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Communication Services	3.2%
Short-Term Investments	4.0%
Financials	9.3%
Industrials	17.7%
Energy	25.7%
Utilities	40.1%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000094893

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Insight Portfolio

Class Name

Trading Symbol

MIGPX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Insight Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$67	1.32%

Expenses Paid, Amount

$ 67

Expense Ratio, Percent

1.32%

AssetsNet

$ 60,673,388

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

22.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$60,673,388
# of Portfolio Holdings	34
Portfolio Turnover Rate	22%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Financials	1.4%
Industrial	1.5%
Short-Term Investments	1.5%
Investment Companies	2.5%
Communication Services	5.8%
Health Care	9.6%
Information Technology	37.0%
Consumer Discretionary	40.7%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000155902

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Insight Portfolio

Class Name

Trading Symbol

MSPTX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Insight Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$106	2.10%

Expenses Paid, Amount

$ 106

Expense Ratio, Percent

2.10%

AssetsNet

$ 60,673,388

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

22.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$60,673,388
# of Portfolio Holdings	34
Portfolio Turnover Rate	22%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Financials	1.4%
Industrial	1.5%
Short-Term Investments	1.5%
Investment Companies	2.5%
Communication Services	5.8%
Health Care	9.6%
Information Technology	37.0%
Consumer Discretionary	40.7%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000094891

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Insight Portfolio

Class Name

Trading Symbol

MIGIX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Insight Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$51	1.00%

Expenses Paid, Amount

$ 51

Expense Ratio, Percent

1.00%

AssetsNet

$ 60,673,388

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

22.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$60,673,388
# of Portfolio Holdings	34
Portfolio Turnover Rate	22%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Financials	1.4%
Industrial	1.5%
Short-Term Investments	1.5%
Investment Companies	2.5%
Communication Services	5.8%
Health Care	9.6%
Information Technology	37.0%
Consumer Discretionary	40.7%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000094892

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Insight Portfolio

Class Name

Trading Symbol

MIGLX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Insight Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class L	$93	1.85%

Expenses Paid, Amount

$ 93

Expense Ratio, Percent

1.85%

AssetsNet

$ 60,673,388

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

22.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$60,673,388
# of Portfolio Holdings	34
Portfolio Turnover Rate	22%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Financials	1.4%
Industrial	1.5%
Short-Term Investments	1.5%
Investment Companies	2.5%
Communication Services	5.8%
Health Care	9.6%
Information Technology	37.0%
Consumer Discretionary	40.7%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000228507

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Insight Portfolio

Class Name

Trading Symbol

MGZZX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Insight Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$48	0.95%

Expenses Paid, Amount

$ 48

Expense Ratio, Percent

0.95%

AssetsNet

$ 60,673,388

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

22.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$60,673,388
# of Portfolio Holdings	34
Portfolio Turnover Rate	22%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Financials	1.4%
Industrial	1.5%
Short-Term Investments	1.5%
Investment Companies	2.5%
Communication Services	5.8%
Health Care	9.6%
Information Technology	37.0%
Consumer Discretionary	40.7%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000085100

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Opportunity Portfolio

Class Name

Trading Symbol

MGGPX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Opportunity Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$64	1.21%

Expenses Paid, Amount

$ 64

Expense Ratio, Percent

1.21%

AssetsNet

$ 2,967,708,392

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

2.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$2,967,708,392
# of Portfolio Holdings	34
Portfolio Turnover Rate	2%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	1.2%
Financials	9.0%
Industrials	12.6%
Communication Services	15.0%
Information Technology	28.5%
Consumer Discretionary	33.7%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000155900

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Opportunity Portfolio

Class Name

Trading Symbol

MSOPX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Opportunity Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$102	1.94%

Expenses Paid, Amount

$ 102

Expense Ratio, Percent

1.94%

AssetsNet

$ 2,967,708,392

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

2.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$2,967,708,392
# of Portfolio Holdings	34
Portfolio Turnover Rate	2%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	1.2%
Financials	9.0%
Industrials	12.6%
Communication Services	15.0%
Information Technology	28.5%
Consumer Discretionary	33.7%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000085098

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Opportunity Portfolio

Class Name

Trading Symbol

MGGIX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Opportunity Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$49	0.93%

Expenses Paid, Amount

$ 49

Expense Ratio, Percent

0.93%

AssetsNet

$ 2,967,708,392

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

2.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$2,967,708,392
# of Portfolio Holdings	34
Portfolio Turnover Rate	2%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	1.2%
Financials	9.0%
Industrials	12.6%
Communication Services	15.0%
Information Technology	28.5%
Consumer Discretionary	33.7%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000198822

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Opportunity Portfolio

Class Name

Trading Symbol

MGORX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Opportunity Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class IR	$45	0.85%

Expenses Paid, Amount

$ 45

Expense Ratio, Percent

0.85%

AssetsNet

$ 2,967,708,392

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

2.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$2,967,708,392
# of Portfolio Holdings	34
Portfolio Turnover Rate	2%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	1.2%
Financials	9.0%
Industrials	12.6%
Communication Services	15.0%
Information Technology	28.5%
Consumer Discretionary	33.7%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000085099

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Opportunity Portfolio

Class Name

Trading Symbol

MGGLX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Opportunity Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class L	$67	1.28%

Expenses Paid, Amount

$ 67

Expense Ratio, Percent

1.28%

AssetsNet

$ 2,967,708,392

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

2.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$2,967,708,392
# of Portfolio Holdings	34
Portfolio Turnover Rate	2%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	1.2%
Financials	9.0%
Industrials	12.6%
Communication Services	15.0%
Information Technology	28.5%
Consumer Discretionary	33.7%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000126921

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Opportunity Portfolio

Class Name

Trading Symbol

MGTSX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Opportunity Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$45	0.85%

Expenses Paid, Amount

$ 45

Expense Ratio, Percent

0.85%

AssetsNet

$ 2,967,708,392

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

2.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$2,967,708,392
# of Portfolio Holdings	34
Portfolio Turnover Rate	2%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	1.2%
Financials	9.0%
Industrials	12.6%
Communication Services	15.0%
Information Technology	28.5%
Consumer Discretionary	33.7%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000211166

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc - Global Permanence Portfolio

Class Name

Trading Symbol

MGKAX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc - Global Permanence Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$69	1.35%

Expenses Paid, Amount

$ 69

Expense Ratio, Percent

1.35%

AssetsNet

$ 4,096,224

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

25.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$4,096,224
# of Portfolio Holdings	47
Portfolio Turnover Rate	25%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Communication Services	0.1%
Short-Term Investments	0.8%
Investment Companies	2.5%
Consumer Staples	2.9%
Materials	3.0%
Energy	4.6%
Real Estate	5.2%
Financials	10.0%
Health Care	15.1%
Information Technology	16.2%
Consumer Discretionary	19.5%
Industrials	20.1%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000211167

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc - Global Permanence Portfolio

Class Name

Trading Symbol

MGKCX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc - Global Permanence Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$106	2.10%

Expenses Paid, Amount

$ 106

Expense Ratio, Percent

2.10%

AssetsNet

$ 4,096,224

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

25.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$4,096,224
# of Portfolio Holdings	47
Portfolio Turnover Rate	25%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Communication Services	0.1%
Short-Term Investments	0.8%
Investment Companies	2.5%
Consumer Staples	2.9%
Materials	3.0%
Energy	4.6%
Real Estate	5.2%
Financials	10.0%
Health Care	15.1%
Information Technology	16.2%
Consumer Discretionary	19.5%
Industrials	20.1%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000211168

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc - Global Permanence Portfolio

Class Name

Trading Symbol

MGKIX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc - Global Permanence Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$51	1.00%

Expenses Paid, Amount

$ 51

Expense Ratio, Percent

1.00%

AssetsNet

$ 4,096,224

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

25.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$4,096,224
# of Portfolio Holdings	47
Portfolio Turnover Rate	25%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Communication Services	0.1%
Short-Term Investments	0.8%
Investment Companies	2.5%
Consumer Staples	2.9%
Materials	3.0%
Energy	4.6%
Real Estate	5.2%
Financials	10.0%
Health Care	15.1%
Information Technology	16.2%
Consumer Discretionary	19.5%
Industrials	20.1%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000211165

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc - Global Permanence Portfolio

Class Name

Trading Symbol

MGKQX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc - Global Permanence Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$48	0.95%

Expenses Paid, Amount

$ 48

Expense Ratio, Percent

0.95%

AssetsNet

$ 4,096,224

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

25.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$4,096,224
# of Portfolio Holdings	47
Portfolio Turnover Rate	25%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Communication Services	0.1%
Short-Term Investments	0.8%
Investment Companies	2.5%
Consumer Staples	2.9%
Materials	3.0%
Energy	4.6%
Real Estate	5.2%
Financials	10.0%
Health Care	15.1%
Information Technology	16.2%
Consumer Discretionary	19.5%
Industrials	20.1%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000034678

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Real Estate Portfolio

Class Name

Trading Symbol

MRLBX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Real Estate Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$57	1.15%

Expenses Paid, Amount

$ 57

Expense Ratio, Percent

1.15%

AssetsNet

$ 37,612,464

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

27.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$37,612,464
# of Portfolio Holdings	79
Portfolio Turnover Rate	27%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	0.7%
Consumer Discretionary	0.9%
Health Care	2.0%
Real Estate	40.5%
Financials	55.9%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000155896

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Real Estate Portfolio

Class Name

Trading Symbol

MSRDX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Real Estate Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$94	1.90%

Expenses Paid, Amount

$ 94

Expense Ratio, Percent

1.90%

AssetsNet

$ 37,612,464

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

27.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$37,612,464
# of Portfolio Holdings	79
Portfolio Turnover Rate	27%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	0.7%
Consumer Discretionary	0.9%
Health Care	2.0%
Real Estate	40.5%
Financials	55.9%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000034677

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Real Estate Portfolio

Class Name

Trading Symbol

MRLAX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Real Estate Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$40	0.80%

Expenses Paid, Amount

$ 40

Expense Ratio, Percent

0.80%

AssetsNet

$ 37,612,464

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

27.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$37,612,464
# of Portfolio Holdings	79
Portfolio Turnover Rate	27%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	0.7%
Consumer Discretionary	0.9%
Health Care	2.0%
Real Estate	40.5%
Financials	55.9%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000198819

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Real Estate Portfolio

Class Name

Trading Symbol

MRLEX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Real Estate Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class IR	$37	0.75%

Expenses Paid, Amount

$ 37

Expense Ratio, Percent

0.75%

AssetsNet

$ 37,612,464

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

27.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$37,612,464
# of Portfolio Holdings	79
Portfolio Turnover Rate	27%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	0.7%
Consumer Discretionary	0.9%
Health Care	2.0%
Real Estate	40.5%
Financials	55.9%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000065130

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Real Estate Portfolio

Class Name

Trading Symbol

MGRLX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Real Estate Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class L	$82	1.65%

Expenses Paid, Amount

$ 82

Expense Ratio, Percent

1.65%

AssetsNet

$ 37,612,464

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

27.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$37,612,464
# of Portfolio Holdings	79
Portfolio Turnover Rate	27%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	0.7%
Consumer Discretionary	0.9%
Health Care	2.0%
Real Estate	40.5%
Financials	55.9%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000126917

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Real Estate Portfolio

Class Name

Trading Symbol

MGREX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Real Estate Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$37	0.75%

Expenses Paid, Amount

$ 37

Expense Ratio, Percent

0.75%

AssetsNet

$ 37,612,464

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

27.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$37,612,464
# of Portfolio Holdings	79
Portfolio Turnover Rate	27%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	0.7%
Consumer Discretionary	0.9%
Health Care	2.0%
Real Estate	40.5%
Financials	55.9%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000129961

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Stars Portfolio

Class Name

Trading Symbol

MGQAX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Stars Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses Paid, Amount

$ 64

Expense Ratio, Percent

1.24%

AssetsNet

$ 87,614,631

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

49.00%

Updated Prospectus Web Address

C000155911

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Stars Portfolio

Class Name

Trading Symbol

MSGQX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Stars Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses Paid, Amount

$ 101

Expense Ratio, Percent

1.98%

AssetsNet

$ 87,614,631

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

49.00%

Updated Prospectus Web Address

C000129960

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Stars Portfolio

Class Name

Trading Symbol

MGQIX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Stars Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses Paid, Amount

$ 46

Expense Ratio, Percent

0.90%

AssetsNet

$ 87,614,631

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

49.00%

Updated Prospectus Web Address

C000129962

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Stars Portfolio

Class Name

Trading Symbol

MGQLX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Stars Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses Paid, Amount

$ 90

Expense Ratio, Percent

1.75%

AssetsNet

$ 87,614,631

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

49.00%

Updated Prospectus Web Address

C000129963

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Global Stars Portfolio

Class Name

Trading Symbol

MGQSX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Global Stars Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses Paid, Amount

$ 44

Expense Ratio, Percent

0.85%

AssetsNet

$ 87,614,631

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

49.00%

Updated Prospectus Web Address

C000007751

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Growth Portfolio

Class Name

Trading Symbol

MSEGX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Growth Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$43	0.86%

Expenses Paid, Amount

$ 43

Expense Ratio, Percent

0.86%

AssetsNet

$ 3,555,420,179

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

15.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$3,555,420,179
# of Portfolio Holdings	39
Portfolio Turnover Rate	15%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	0.8%
Real Estate	1.0%
Investment Companies	2.5%
Industrials	3.8%
Health Care	8.3%
Financials	11.3%
Communication Services	12.7%
Consumer Discretionary	28.4%
Information Technology	31.2%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000155892

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Growth Portfolio

Class Name

Trading Symbol

MSGUX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Growth Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$80	1.61%

Expenses Paid, Amount

$ 80

Expense Ratio, Percent

1.61%

AssetsNet

$ 3,555,420,179

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

15.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$3,555,420,179
# of Portfolio Holdings	39
Portfolio Turnover Rate	15%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	0.8%
Real Estate	1.0%
Investment Companies	2.5%
Industrials	3.8%
Health Care	8.3%
Financials	11.3%
Communication Services	12.7%
Consumer Discretionary	28.4%
Information Technology	31.2%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000007750

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Growth Portfolio

Class Name

Trading Symbol

MSEQX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Growth Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$31	0.62%

Expenses Paid, Amount

$ 31

Expense Ratio, Percent

0.62%

AssetsNet

$ 3,555,420,179

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

15.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$3,555,420,179
# of Portfolio Holdings	39
Portfolio Turnover Rate	15%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	0.8%
Real Estate	1.0%
Investment Companies	2.5%
Industrials	3.8%
Health Care	8.3%
Financials	11.3%
Communication Services	12.7%
Consumer Discretionary	28.4%
Information Technology	31.2%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000198816

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Growth Portfolio

Class Name

Trading Symbol

MGHRX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Growth Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class IR	$25	0.51%

Expenses Paid, Amount

$ 25

Expense Ratio, Percent

0.51%

AssetsNet

$ 3,555,420,179

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

15.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$3,555,420,179
# of Portfolio Holdings	39
Portfolio Turnover Rate	15%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	0.8%
Real Estate	1.0%
Investment Companies	2.5%
Industrials	3.8%
Health Care	8.3%
Financials	11.3%
Communication Services	12.7%
Consumer Discretionary	28.4%
Information Technology	31.2%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000113805

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Growth Portfolio

Class Name

Trading Symbol

MSHLX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Growth Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class L	$67	1.35%

Expenses Paid, Amount

$ 67

Expense Ratio, Percent

1.35%

AssetsNet

$ 3,555,420,179

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

15.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$3,555,420,179
# of Portfolio Holdings	39
Portfolio Turnover Rate	15%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	0.8%
Real Estate	1.0%
Investment Companies	2.5%
Industrials	3.8%
Health Care	8.3%
Financials	11.3%
Communication Services	12.7%
Consumer Discretionary	28.4%
Information Technology	31.2%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000126914

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Growth Portfolio

Class Name

Trading Symbol

MGRPX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Growth Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$25	0.51%

Expenses Paid, Amount

$ 25

Expense Ratio, Percent

0.51%

AssetsNet

$ 3,555,420,179

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

15.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$3,555,420,179
# of Portfolio Holdings	39
Portfolio Turnover Rate	15%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	0.8%
Real Estate	1.0%
Investment Companies	2.5%
Industrials	3.8%
Health Care	8.3%
Financials	11.3%
Communication Services	12.7%
Consumer Discretionary	28.4%
Information Technology	31.2%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000007745

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Inception Portfolio

Class Name

Trading Symbol

MSSMX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Inception Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$60	1.27%

Expenses Paid, Amount

$ 60

Expense Ratio, Percent

1.27%

AssetsNet

$ 325,741,401

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

59.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$325,741,401
# of Portfolio Holdings	52
Portfolio Turnover Rate	59%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Materials	0.3%
Industrials	0.5%
Real Estate	0.9%
Investment Companies	2.6%
Short-Term Investments	2.9%
Consumer Staples	3.1%
Communication Services	4.9%
Financials	7.2%
Health Care	21.7%
Consumer Discretionary	24.2%
Information Technology	31.7%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000155889

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Inception Portfolio

Class Name

Trading Symbol

MSCOX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Inception Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$99	2.09%

Expenses Paid, Amount

$ 99

Expense Ratio, Percent

2.09%

AssetsNet

$ 325,741,401

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

59.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$325,741,401
# of Portfolio Holdings	52
Portfolio Turnover Rate	59%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Materials	0.3%
Industrials	0.5%
Real Estate	0.9%
Investment Companies	2.6%
Short-Term Investments	2.9%
Consumer Staples	3.1%
Communication Services	4.9%
Financials	7.2%
Health Care	21.7%
Consumer Discretionary	24.2%
Information Technology	31.7%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000007744

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Inception Portfolio

Class Name

Trading Symbol

MSSGX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Inception Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$44	0.93%

Expenses Paid, Amount

$ 44

Expense Ratio, Percent

0.93%

AssetsNet

$ 325,741,401

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

59.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$325,741,401
# of Portfolio Holdings	52
Portfolio Turnover Rate	59%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Materials	0.3%
Industrials	0.5%
Real Estate	0.9%
Investment Companies	2.6%
Short-Term Investments	2.9%
Consumer Staples	3.1%
Communication Services	4.9%
Financials	7.2%
Health Care	21.7%
Consumer Discretionary	24.2%
Information Technology	31.7%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000104303

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Inception Portfolio

Class Name

Trading Symbol

MSSLX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Inception Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class L	$87	1.84%

Expenses Paid, Amount

$ 87

Expense Ratio, Percent

1.84%

AssetsNet

$ 325,741,401

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

59.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$325,741,401
# of Portfolio Holdings	52
Portfolio Turnover Rate	59%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Materials	0.3%
Industrials	0.5%
Real Estate	0.9%
Investment Companies	2.6%
Short-Term Investments	2.9%
Consumer Staples	3.1%
Communication Services	4.9%
Financials	7.2%
Health Care	21.7%
Consumer Discretionary	24.2%
Information Technology	31.7%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000129402

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Inception Portfolio

Class Name

Trading Symbol

MFLLX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Inception Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$44	0.93%

Expenses Paid, Amount

$ 44

Expense Ratio, Percent

0.93%

AssetsNet

$ 325,741,401

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

59.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$325,741,401
# of Portfolio Holdings	52
Portfolio Turnover Rate	59%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Materials	0.3%
Industrials	0.5%
Real Estate	0.9%
Investment Companies	2.6%
Short-Term Investments	2.9%
Consumer Staples	3.1%
Communication Services	4.9%
Financials	7.2%
Health Care	21.7%
Consumer Discretionary	24.2%
Information Technology	31.7%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000094900

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - International Advantage Portfolio

Class Name

Trading Symbol

MFAPX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - International Advantage Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$65	1.29%

Expenses Paid, Amount

$ 65

Expense Ratio, Percent

1.29%

AssetsNet

$ 2,983,124,503

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

13.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$2,983,124,503
# of Portfolio Holdings	34
Portfolio Turnover Rate	13%

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Hong Kong	2.0%
Sweden	2.7%
United Kingdom	4.6%
Japan	5.1%
Taiwan	5.3%
Switzerland	6.7%
Italy	7.0%
India	8.1%
Netherlands	8.9%
Denmark	9.0%
United States	12.6%
Canada	13.3%
France	14.7%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000155904

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - International Advantage Portfolio

Class Name

Trading Symbol

MSIAX

Annual or Semi-Annual Statement [Text Block]

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$101	2.01%

Expenses Paid, Amount

$ 101

Expense Ratio, Percent

2.01%

AssetsNet

$ 2,983,124,503

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

13.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$2,983,124,503
# of Portfolio Holdings	34
Portfolio Turnover Rate	13%

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Hong Kong	2.0%
Sweden	2.7%
United Kingdom	4.6%
Japan	5.1%
Taiwan	5.3%
Switzerland	6.7%
Italy	7.0%
India	8.1%
Netherlands	8.9%
Denmark	9.0%
United States	12.6%
Canada	13.3%
France	14.7%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000094898

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - International Advantage Portfolio

Class Name

Trading Symbol

MFAIX

Annual or Semi-Annual Statement [Text Block]

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$50	0.99%

Expenses Paid, Amount

$ 50

Expense Ratio, Percent

0.99%

AssetsNet

$ 2,983,124,503

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

13.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$2,983,124,503
# of Portfolio Holdings	34
Portfolio Turnover Rate	13%

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Hong Kong	2.0%
Sweden	2.7%
United Kingdom	4.6%
Japan	5.1%
Taiwan	5.3%
Switzerland	6.7%
Italy	7.0%
India	8.1%
Netherlands	8.9%
Denmark	9.0%
United States	12.6%
Canada	13.3%
France	14.7%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000094899

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - International Advantage Portfolio

Class Name

Trading Symbol

MSALX

Annual or Semi-Annual Statement [Text Block]

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class L	$93	1.85%

Expenses Paid, Amount

$ 93

Expense Ratio, Percent

1.85%

AssetsNet

$ 2,983,124,503

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

13.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$2,983,124,503
# of Portfolio Holdings	34
Portfolio Turnover Rate	13%

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Hong Kong	2.0%
Sweden	2.7%
United Kingdom	4.6%
Japan	5.1%
Taiwan	5.3%
Switzerland	6.7%
Italy	7.0%
India	8.1%
Netherlands	8.9%
Denmark	9.0%
United States	12.6%
Canada	13.3%
France	14.7%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000198826

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - International Advantage Portfolio

Class Name

Trading Symbol

IDVSX

Annual or Semi-Annual Statement [Text Block]

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$45	0.89%

Expenses Paid, Amount

$ 45

Expense Ratio, Percent

0.89%

AssetsNet

$ 2,983,124,503

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

13.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$2,983,124,503
# of Portfolio Holdings	34
Portfolio Turnover Rate	13%

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Hong Kong	2.0%
Sweden	2.7%
United Kingdom	4.6%
Japan	5.1%
Taiwan	5.3%
Switzerland	6.7%
Italy	7.0%
India	8.1%
Netherlands	8.9%
Denmark	9.0%
United States	12.6%
Canada	13.3%
France	14.7%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000007759

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - International Equity Portfolio

Class Name

Trading Symbol

MIQBX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - International Equity Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$64	1.27%

Expenses Paid, Amount

$ 64

Expense Ratio, Percent

1.27%

AssetsNet

$ 1,304,075,475

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

22.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$1,304,075,475
# of Portfolio Holdings	64
Portfolio Turnover Rate	22%

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other^{Footnote Reference1}	0.9%
Belgium	1.2%
United States	1.2%
Australia	1.2%
Hong Kong	1.7%
Italy	1.8%
Taiwan	1.9%
Korea, Republic Of	1.9%
Singapore	1.9%
Finland	2.2%
Denmark	4.1%
Netherlands	4.0%
Switzerland	4.4%
Japan	5.3%
Sweden	5.6%
Canada	6.2%
France	12.0%
Germany	12.4%
United Kingdom	30.1%

Footnote	Description
Footnote¹	Represents investments in countries less than 1% of total investments.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000155894

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - International Equity Portfolio

Class Name

Trading Symbol

MSECX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - International Equity Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$104	2.05%

Expenses Paid, Amount

$ 104

Expense Ratio, Percent

2.05%

AssetsNet

$ 1,304,075,475

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

22.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$1,304,075,475
# of Portfolio Holdings	64
Portfolio Turnover Rate	22%

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other^{Footnote Reference1}	0.9%
Belgium	1.2%
United States	1.2%
Australia	1.2%
Hong Kong	1.7%
Italy	1.8%
Taiwan	1.9%
Korea, Republic Of	1.9%
Singapore	1.9%
Finland	2.2%
Denmark	4.1%
Netherlands	4.0%
Switzerland	4.4%
Japan	5.3%
Sweden	5.6%
Canada	6.2%
France	12.0%
Germany	12.4%
United Kingdom	30.1%

Footnote	Description
Footnote¹	Represents investments in countries less than 1% of total investments.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000007758

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - International Equity Portfolio

Class Name

Trading Symbol

MSIQX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - International Equity Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$48	0.95%

Expenses Paid, Amount

$ 48

Expense Ratio, Percent

0.95%

AssetsNet

$ 1,304,075,475

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

22.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$1,304,075,475
# of Portfolio Holdings	64
Portfolio Turnover Rate	22%

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other^{Footnote Reference1}	0.9%
Belgium	1.2%
United States	1.2%
Australia	1.2%
Hong Kong	1.7%
Italy	1.8%
Taiwan	1.9%
Korea, Republic Of	1.9%
Singapore	1.9%
Finland	2.2%
Denmark	4.1%
Netherlands	4.0%
Switzerland	4.4%
Japan	5.3%
Sweden	5.6%
Canada	6.2%
France	12.0%
Germany	12.4%
United Kingdom	30.1%

Footnote	Description
Footnote¹	Represents investments in countries less than 1% of total investments.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000113811

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - International Equity Portfolio

Class Name

Trading Symbol

MSQLX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - International Equity Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class L	$91	1.80%

Expenses Paid, Amount

$ 91

Expense Ratio, Percent

1.80%

AssetsNet

$ 1,304,075,475

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

22.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$1,304,075,475
# of Portfolio Holdings	64
Portfolio Turnover Rate	22%

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other^{Footnote Reference1}	0.9%
Belgium	1.2%
United States	1.2%
Australia	1.2%
Hong Kong	1.7%
Italy	1.8%
Taiwan	1.9%
Korea, Republic Of	1.9%
Singapore	1.9%
Finland	2.2%
Denmark	4.1%
Netherlands	4.0%
Switzerland	4.4%
Japan	5.3%
Sweden	5.6%
Canada	6.2%
France	12.0%
Germany	12.4%
United Kingdom	30.1%

Footnote	Description
Footnote¹	Represents investments in countries less than 1% of total investments.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000126915

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - International Equity Portfolio

Class Name

Trading Symbol

MIQPX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - International Equity Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$46	0.91%

Expenses Paid, Amount

$ 46

Expense Ratio, Percent

0.91%

AssetsNet

$ 1,304,075,475

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

22.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$1,304,075,475
# of Portfolio Holdings	64
Portfolio Turnover Rate	22%

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other^{Footnote Reference1}	0.9%
Belgium	1.2%
United States	1.2%
Australia	1.2%
Hong Kong	1.7%
Italy	1.8%
Taiwan	1.9%
Korea, Republic Of	1.9%
Singapore	1.9%
Finland	2.2%
Denmark	4.1%
Netherlands	4.0%
Switzerland	4.4%
Japan	5.3%
Sweden	5.6%
Canada	6.2%
France	12.0%
Germany	12.4%
United Kingdom	30.1%

Footnote	Description
Footnote¹	Represents investments in countries less than 1% of total investments.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000085089

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - International Opportunity Portfolio

Class Name

Trading Symbol

MIOPX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - International Opportunity Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$69	1.33%

Expenses Paid, Amount

$ 69

Expense Ratio, Percent

1.33%

AssetsNet

$ 935,940,832

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

7.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$935,940,832
# of Portfolio Holdings	37
Portfolio Turnover Rate	7%

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Argentina	1.1%
United Kingdom	2.3%
Singapore	2.4%
Sweden	2.7%
Taiwan	3.5%
Switzerland	4.0%
Italy	4.3%
Brazil	4.3%
France	4.6%
Japan	4.8%
Denmark	5.3%
Canada	5.8%
Netherlands	5.9%
Korea, Republic Of	8.6%
India	12.7%
China	12.8%
United States	14.9%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000155897

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - International Opportunity Portfolio

Class Name

Trading Symbol

MSOCX

Annual or Semi-Annual Statement [Text Block]

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$107	2.07%

Expenses Paid, Amount

$ 107

Expense Ratio, Percent

2.07%

AssetsNet

$ 935,940,832

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

7.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$935,940,832
# of Portfolio Holdings	37
Portfolio Turnover Rate	7%

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Argentina	1.1%
United Kingdom	2.3%
Singapore	2.4%
Sweden	2.7%
Taiwan	3.5%
Switzerland	4.0%
Italy	4.3%
Brazil	4.3%
France	4.6%
Japan	4.8%
Denmark	5.3%
Canada	5.8%
Netherlands	5.9%
Korea, Republic Of	8.6%
India	12.7%
China	12.8%
United States	14.9%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000085087

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - International Opportunity Portfolio

Class Name

Trading Symbol

MIOIX

Annual or Semi-Annual Statement [Text Block]

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$52	1.00%

Expenses Paid, Amount

$ 52

Expense Ratio, Percent

1.00%

AssetsNet

$ 935,940,832

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

7.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$935,940,832
# of Portfolio Holdings	37
Portfolio Turnover Rate	7%

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Argentina	1.1%
United Kingdom	2.3%
Singapore	2.4%
Sweden	2.7%
Taiwan	3.5%
Switzerland	4.0%
Italy	4.3%
Brazil	4.3%
France	4.6%
Japan	4.8%
Denmark	5.3%
Canada	5.8%
Netherlands	5.9%
Korea, Republic Of	8.6%
India	12.7%
China	12.8%
United States	14.9%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000198820

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - International Opportunity Portfolio

Class Name

Trading Symbol

MRNPX

Annual or Semi-Annual Statement [Text Block]

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class IR	$49	0.94%

Expenses Paid, Amount

$ 49

Expense Ratio, Percent

0.94%

AssetsNet

$ 935,940,832

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

7.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$935,940,832
# of Portfolio Holdings	37
Portfolio Turnover Rate	7%

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Argentina	1.1%
United Kingdom	2.3%
Singapore	2.4%
Sweden	2.7%
Taiwan	3.5%
Switzerland	4.0%
Italy	4.3%
Brazil	4.3%
France	4.6%
Japan	4.8%
Denmark	5.3%
Canada	5.8%
Netherlands	5.9%
Korea, Republic Of	8.6%
India	12.7%
China	12.8%
United States	14.9%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000085088

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - International Opportunity Portfolio

Class Name

Trading Symbol

MIOLX

Annual or Semi-Annual Statement [Text Block]

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class L	$96	1.85%

Expenses Paid, Amount

$ 96

Expense Ratio, Percent

1.85%

AssetsNet

$ 935,940,832

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

7.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$935,940,832
# of Portfolio Holdings	37
Portfolio Turnover Rate	7%

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Argentina	1.1%
United Kingdom	2.3%
Singapore	2.4%
Sweden	2.7%
Taiwan	3.5%
Switzerland	4.0%
Italy	4.3%
Brazil	4.3%
France	4.6%
Japan	4.8%
Denmark	5.3%
Canada	5.8%
Netherlands	5.9%
Korea, Republic Of	8.6%
India	12.7%
China	12.8%
United States	14.9%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000126918

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - International Opportunity Portfolio

Class Name

Trading Symbol

MNOPX

Annual or Semi-Annual Statement [Text Block]

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$49	0.94%

Expenses Paid, Amount

$ 49

Expense Ratio, Percent

0.94%

AssetsNet

$ 935,940,832

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

7.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$935,940,832
# of Portfolio Holdings	37
Portfolio Turnover Rate	7%

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Argentina	1.1%
United Kingdom	2.3%
Singapore	2.4%
Sweden	2.7%
Taiwan	3.5%
Switzerland	4.0%
Italy	4.3%
Brazil	4.3%
France	4.6%
Japan	4.8%
Denmark	5.3%
Canada	5.8%
Netherlands	5.9%
Korea, Republic Of	8.6%
India	12.7%
China	12.8%
United States	14.9%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000236930

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc - International Resilience Portfolio

Class Name

Trading Symbol

MSDFX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc - International Resilience Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$61	1.20%

Expenses Paid, Amount

$ 61

Expense Ratio, Percent

1.20%

AssetsNet

$ 1,829,245

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

18.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$1,829,245
# of Portfolio Holdings	40
Portfolio Turnover Rate	18%

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Australia	1.9%
Hong Kong	2.3%
Denmark	2.6%
Finland	2.7%
Italy	2.9%
Taiwan	3.0%
Switzerland	3.7%
Canada	3.8%
Japan	4.5%
Netherlands	5.0%
Sweden	7.2%
United States	9.7%
France	13.0%
Germany	16.5%
United Kingdom	21.2%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000236928

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc - International Resilience Portfolio

Class Name

Trading Symbol

MSDEX

Annual or Semi-Annual Statement [Text Block]

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$99	1.95%

Expenses Paid, Amount

$ 99

Expense Ratio, Percent

1.95%

AssetsNet

$ 1,829,245

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

18.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$1,829,245
# of Portfolio Holdings	40
Portfolio Turnover Rate	18%

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Australia	1.9%
Hong Kong	2.3%
Denmark	2.6%
Finland	2.7%
Italy	2.9%
Taiwan	3.0%
Switzerland	3.7%
Canada	3.8%
Japan	4.5%
Netherlands	5.0%
Sweden	7.2%
United States	9.7%
France	13.0%
Germany	16.5%
United Kingdom	21.2%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000236927

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc - International Resilience Portfolio

Class Name

Trading Symbol

MSDKX

Annual or Semi-Annual Statement [Text Block]

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$43	0.85%

Expenses Paid, Amount

$ 43

Expense Ratio, Percent

0.85%

AssetsNet

$ 1,829,245

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

18.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$1,829,245
# of Portfolio Holdings	40
Portfolio Turnover Rate	18%

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Australia	1.9%
Hong Kong	2.3%
Denmark	2.6%
Finland	2.7%
Italy	2.9%
Taiwan	3.0%
Switzerland	3.7%
Canada	3.8%
Japan	4.5%
Netherlands	5.0%
Sweden	7.2%
United States	9.7%
France	13.0%
Germany	16.5%
United Kingdom	21.2%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000236929

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc - International Resilience Portfolio

Class Name

Trading Symbol

MSCZX

Annual or Semi-Annual Statement [Text Block]

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$41	0.80%

Expenses Paid, Amount

$ 41

Expense Ratio, Percent

0.80%

AssetsNet

$ 1,829,245

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

18.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$1,829,245
# of Portfolio Holdings	40
Portfolio Turnover Rate	18%

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Australia	1.9%
Hong Kong	2.3%
Denmark	2.6%
Finland	2.7%
Italy	2.9%
Taiwan	3.0%
Switzerland	3.7%
Canada	3.8%
Japan	4.5%
Netherlands	5.0%
Sweden	7.2%
United States	9.7%
France	13.0%
Germany	16.5%
United Kingdom	21.2%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000200800

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Multi-Asset Real Return Portfolio

Class Name

Trading Symbol

MRJAX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Multi-Asset Real Return Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$55	1.11%

Expenses Paid, Amount

$ 55

Expense Ratio, Percent

1.11%

AssetsNet

$ 21,068,020

Holdings Count | Holding

217

InvestmentCompanyPortfolioTurnover

151.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$21,068,020
# of Portfolio Holdings	217
Portfolio Turnover Rate	151%

Holdings [Text Block]

Industry Weightings (% of total investments)

Value	Value
Other^{Footnote Reference1}	6.8%
Metals & Mining	6.5%
Oil, Gas & Consumable Fuels	6.9%
Short-Term Investments	12.6%
Sovereign	67.2%

Footnote	Description
Footnote¹	Industries and/or investment types representing less than 5% of total investments.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000200801

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Multi-Asset Real Return Portfolio

Class Name

Trading Symbol

MRJCX

Annual or Semi-Annual Statement [Text Block]

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$91	1.84%

Expenses Paid, Amount

$ 91

Expense Ratio, Percent

1.84%

AssetsNet

$ 21,068,020

Holdings Count | Holding

217

InvestmentCompanyPortfolioTurnover

151.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$21,068,020
# of Portfolio Holdings	217
Portfolio Turnover Rate	151%

Holdings [Text Block]

Industry Weightings (% of total investments)

Value	Value
Other^{Footnote Reference1}	6.8%
Metals & Mining	6.5%
Oil, Gas & Consumable Fuels	6.9%
Short-Term Investments	12.6%
Sovereign	67.2%

Footnote	Description
Footnote¹	Industries and/or investment types representing less than 5% of total investments.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000200799

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Multi-Asset Real Return Portfolio

Class Name

Trading Symbol

MRJIX

Annual or Semi-Annual Statement [Text Block]

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$38	0.76%

Expenses Paid, Amount

$ 38

Expense Ratio, Percent

0.76%

AssetsNet

$ 21,068,020

Holdings Count | Holding

217

InvestmentCompanyPortfolioTurnover

151.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$21,068,020
# of Portfolio Holdings	217
Portfolio Turnover Rate	151%

Holdings [Text Block]

Industry Weightings (% of total investments)

Value	Value
Other^{Footnote Reference1}	6.8%
Metals & Mining	6.5%
Oil, Gas & Consumable Fuels	6.9%
Short-Term Investments	12.6%
Sovereign	67.2%

Footnote	Description
Footnote¹	Industries and/or investment types representing less than 5% of total investments.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000200802

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Multi-Asset Real Return Portfolio

Class Name

Trading Symbol

MRJSX

Annual or Semi-Annual Statement [Text Block]

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$35	0.71%

Expenses Paid, Amount

$ 35

Expense Ratio, Percent

0.71%

AssetsNet

$ 21,068,020

Holdings Count | Holding

217

InvestmentCompanyPortfolioTurnover

151.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$21,068,020
# of Portfolio Holdings	217
Portfolio Turnover Rate	151%

Holdings [Text Block]

Industry Weightings (% of total investments)

Value	Value
Other^{Footnote Reference1}	6.8%
Metals & Mining	6.5%
Oil, Gas & Consumable Fuels	6.9%
Short-Term Investments	12.6%
Sovereign	67.2%

Footnote	Description
Footnote¹	Industries and/or investment types representing less than 5% of total investments.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000115786

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Next Gen Emerging Markets Portfolio

Class Name

Trading Symbol

MFMPX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Next Gen Emerging Markets Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$81	1.60%

Expenses Paid, Amount

$ 81

Expense Ratio, Percent

1.60%

AssetsNet

$ 27,264,238

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

25.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$27,264,238
# of Portfolio Holdings	41
Portfolio Turnover Rate	25%

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other^{Footnote Reference1}	0.8%
South Africa	1.1%
United Kingdom	1.2%
United Arab Emirates	1.6%
Argentina	2.2%
Kenya	2.9%
Slovenia	3.1%
Bangladesh	3.3%
Turkey	3.4%
Egypt	3.7%
Pakistan	5.2%
Philippines	7.3%
Poland	7.3%
United States	9.3%
Kazakhstan	11.5%
Indonesia	13.6%
Vietnam	22.5%

Footnote	Description
Footnote¹	Represents investments in countries less than 1% of total investments.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000155910

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Next Gen Emerging Markets Portfolio

Class Name

Trading Symbol

MSFEX

Annual or Semi-Annual Statement [Text Block]

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$119	2.35%

Expenses Paid, Amount

$ 119

Expense Ratio, Percent

2.35%

AssetsNet

$ 27,264,238

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

25.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$27,264,238
# of Portfolio Holdings	41
Portfolio Turnover Rate	25%

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other^{Footnote Reference1}	0.8%
South Africa	1.1%
United Kingdom	1.2%
United Arab Emirates	1.6%
Argentina	2.2%
Kenya	2.9%
Slovenia	3.1%
Bangladesh	3.3%
Turkey	3.4%
Egypt	3.7%
Pakistan	5.2%
Philippines	7.3%
Poland	7.3%
United States	9.3%
Kazakhstan	11.5%
Indonesia	13.6%
Vietnam	22.5%

Footnote	Description
Footnote¹	Represents investments in countries less than 1% of total investments.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000115785

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Next Gen Emerging Markets Portfolio

Class Name

Trading Symbol

MFMIX

Annual or Semi-Annual Statement [Text Block]

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$64	1.25%

Expenses Paid, Amount

$ 64

Expense Ratio, Percent

1.25%

AssetsNet

$ 27,264,238

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

25.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$27,264,238
# of Portfolio Holdings	41
Portfolio Turnover Rate	25%

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other^{Footnote Reference1}	0.8%
South Africa	1.1%
United Kingdom	1.2%
United Arab Emirates	1.6%
Argentina	2.2%
Kenya	2.9%
Slovenia	3.1%
Bangladesh	3.3%
Turkey	3.4%
Egypt	3.7%
Pakistan	5.2%
Philippines	7.3%
Poland	7.3%
United States	9.3%
Kazakhstan	11.5%
Indonesia	13.6%
Vietnam	22.5%

Footnote	Description
Footnote¹	Represents investments in countries less than 1% of total investments.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000115788

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Next Gen Emerging Markets Portfolio

Class Name

Trading Symbol

MFMLX

Annual or Semi-Annual Statement [Text Block]

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class L	$107	2.10%

Expenses Paid, Amount

$ 107

Expense Ratio, Percent

2.10%

AssetsNet

$ 27,264,238

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

25.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$27,264,238
# of Portfolio Holdings	41
Portfolio Turnover Rate	25%

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other^{Footnote Reference1}	0.8%
South Africa	1.1%
United Kingdom	1.2%
United Arab Emirates	1.6%
Argentina	2.2%
Kenya	2.9%
Slovenia	3.1%
Bangladesh	3.3%
Turkey	3.4%
Egypt	3.7%
Pakistan	5.2%
Philippines	7.3%
Poland	7.3%
United States	9.3%
Kazakhstan	11.5%
Indonesia	13.6%
Vietnam	22.5%

Footnote	Description
Footnote¹	Represents investments in countries less than 1% of total investments.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000152578

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Next Gen Emerging Markets Portfolio

Class Name

Trading Symbol

MSRFX

Annual or Semi-Annual Statement [Text Block]

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$61	1.20%

Expenses Paid, Amount

$ 61

Expense Ratio, Percent

1.20%

AssetsNet

$ 27,264,238

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

25.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$27,264,238
# of Portfolio Holdings	41
Portfolio Turnover Rate	25%

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other^{Footnote Reference1}	0.8%
South Africa	1.1%
United Kingdom	1.2%
United Arab Emirates	1.6%
Argentina	2.2%
Kenya	2.9%
Slovenia	3.1%
Bangladesh	3.3%
Turkey	3.4%
Egypt	3.7%
Pakistan	5.2%
Philippines	7.3%
Poland	7.3%
United States	9.3%
Kazakhstan	11.5%
Indonesia	13.6%
Vietnam	22.5%

Footnote	Description
Footnote¹	Represents investments in countries less than 1% of total investments.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000007737

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Passport Overseas Equity Portfolio

Class Name

Trading Symbol

MSIBX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Passport Overseas Equity Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$62	1.19%

Expenses Paid, Amount

$ 62

Expense Ratio, Percent

1.19%

AssetsNet

$ 159,816,612

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

8.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$159,816,612
# of Portfolio Holdings	69
Portfolio Turnover Rate	8%

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other^{Footnote Reference1}	0.7%
Norway	1.1%
Israel	1.2%
Denmark	2.6%
Ireland	2.6%
Singapore	3.4%
South Africa	3.5%
Netherlands	4.3%
Canada	4.6%
Argentina	5.0%
China	5.0%
Taiwan	5.2%
India	5.9%
United States	5.8%
Germany	6.1%
Korea, Republic Of	7.0%
Japan	8.4%
France	9.9%
United Kingdom	17.7%

Footnote	Description
Footnote¹	Represents investments in countries less than 1% of total investments.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000155887

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Passport Overseas Equity Portfolio

Class Name

Trading Symbol

MSAAX

Annual or Semi-Annual Statement [Text Block]

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$104	2.00%

Expenses Paid, Amount

$ 104

Expense Ratio, Percent

2.00%

AssetsNet

$ 159,816,612

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

8.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$159,816,612
# of Portfolio Holdings	69
Portfolio Turnover Rate	8%

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other^{Footnote Reference1}	0.7%
Norway	1.1%
Israel	1.2%
Denmark	2.6%
Ireland	2.6%
Singapore	3.4%
South Africa	3.5%
Netherlands	4.3%
Canada	4.6%
Argentina	5.0%
China	5.0%
Taiwan	5.2%
India	5.9%
United States	5.8%
Germany	6.1%
Korea, Republic Of	7.0%
Japan	8.4%
France	9.9%
United Kingdom	17.7%

Footnote	Description
Footnote¹	Represents investments in countries less than 1% of total investments.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000007736

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Passport Overseas Equity Portfolio

Class Name

Trading Symbol

MSACX

Annual or Semi-Annual Statement [Text Block]

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$47	0.90%

Expenses Paid, Amount

$ 47

Expense Ratio, Percent

0.90%

AssetsNet

$ 159,816,612

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

8.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$159,816,612
# of Portfolio Holdings	69
Portfolio Turnover Rate	8%

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other^{Footnote Reference1}	0.7%
Norway	1.1%
Israel	1.2%
Denmark	2.6%
Ireland	2.6%
Singapore	3.4%
South Africa	3.5%
Netherlands	4.3%
Canada	4.6%
Argentina	5.0%
China	5.0%
Taiwan	5.2%
India	5.9%
United States	5.8%
Germany	6.1%
Korea, Republic Of	7.0%
Japan	8.4%
France	9.9%
United Kingdom	17.7%

Footnote	Description
Footnote¹	Represents investments in countries less than 1% of total investments.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000215549

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Passport Overseas Equity Portfolio

Class Name

Trading Symbol

MAIHX

Annual or Semi-Annual Statement [Text Block]

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class IR	$44	0.85%

Expenses Paid, Amount

$ 44

Expense Ratio, Percent

0.85%

AssetsNet

$ 159,816,612

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

8.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$159,816,612
# of Portfolio Holdings	69
Portfolio Turnover Rate	8%

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other^{Footnote Reference1}	0.7%
Norway	1.1%
Israel	1.2%
Denmark	2.6%
Ireland	2.6%
Singapore	3.4%
South Africa	3.5%
Netherlands	4.3%
Canada	4.6%
Argentina	5.0%
China	5.0%
Taiwan	5.2%
India	5.9%
United States	5.8%
Germany	6.1%
Korea, Republic Of	7.0%
Japan	8.4%
France	9.9%
United Kingdom	17.7%

Footnote	Description
Footnote¹	Represents investments in countries less than 1% of total investments.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000113799

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Passport Overseas Equity Portfolio

Class Name

Trading Symbol

MSLLX

Annual or Semi-Annual Statement [Text Block]

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class L	$90	1.74%

Expenses Paid, Amount

$ 90

Expense Ratio, Percent

1.74%

AssetsNet

$ 159,816,612

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

8.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$159,816,612
# of Portfolio Holdings	69
Portfolio Turnover Rate	8%

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other^{Footnote Reference1}	0.7%
Norway	1.1%
Israel	1.2%
Denmark	2.6%
Ireland	2.6%
Singapore	3.4%
South Africa	3.5%
Netherlands	4.3%
Canada	4.6%
Argentina	5.0%
China	5.0%
Taiwan	5.2%
India	5.9%
United States	5.8%
Germany	6.1%
Korea, Republic Of	7.0%
Japan	8.4%
France	9.9%
United Kingdom	17.7%

Footnote	Description
Footnote¹	Represents investments in countries less than 1% of total investments.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000215548

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Passport Overseas Equity Portfolio

Class Name

Trading Symbol

MAIJX

Annual or Semi-Annual Statement [Text Block]

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$44	0.85%

Expenses Paid, Amount

$ 44

Expense Ratio, Percent

0.85%

AssetsNet

$ 159,816,612

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

8.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$159,816,612
# of Portfolio Holdings	69
Portfolio Turnover Rate	8%

Holdings [Text Block]

Country Weightings (% of total investments)

Value	Value
Other^{Footnote Reference1}	0.7%
Norway	1.1%
Israel	1.2%
Denmark	2.6%
Ireland	2.6%
Singapore	3.4%
South Africa	3.5%
Netherlands	4.3%
Canada	4.6%
Argentina	5.0%
China	5.0%
Taiwan	5.2%
India	5.9%
United States	5.8%
Germany	6.1%
Korea, Republic Of	7.0%
Japan	8.4%
France	9.9%
United Kingdom	17.7%

Footnote	Description
Footnote¹	Represents investments in countries less than 1% of total investments.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000218315

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc - Permanence Portfolio

Class Name

Trading Symbol

MSHNX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc - Permanence Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$61	1.20%

Expenses Paid, Amount

$ 61

Expense Ratio, Percent

1.20%

AssetsNet

$ 4,355,245

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

29.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$4,355,245
# of Portfolio Holdings	67
Portfolio Turnover Rate	29%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Communication Services	0.6%
Short-Term Investments	1.6%
Investment Companies	2.4%
Materials	3.1%
Energy	4.5%
Consumer Staples	4.6%
Real Estate	5.1%
Financials	9.2%
Health Care	14.3%
Industrials	16.4%
Information Technology	17.0%
Consumer Discretionary	21.2%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000218316

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc - Permanence Portfolio

Class Name

Trading Symbol

MSHOX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc - Permanence Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$99	1.95%

Expenses Paid, Amount

$ 99

Expense Ratio, Percent

1.95%

AssetsNet

$ 4,355,245

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

29.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$4,355,245
# of Portfolio Holdings	67
Portfolio Turnover Rate	29%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Communication Services	0.6%
Short-Term Investments	1.6%
Investment Companies	2.4%
Materials	3.1%
Energy	4.5%
Consumer Staples	4.6%
Real Estate	5.1%
Financials	9.2%
Health Care	14.3%
Industrials	16.4%
Information Technology	17.0%
Consumer Discretionary	21.2%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000218317

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc - Permanence Portfolio

Class Name

Trading Symbol

MSHMX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc - Permanence Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$43	0.85%

Expenses Paid, Amount

$ 43

Expense Ratio, Percent

0.85%

AssetsNet

$ 4,355,245

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

29.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$4,355,245
# of Portfolio Holdings	67
Portfolio Turnover Rate	29%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Communication Services	0.6%
Short-Term Investments	1.6%
Investment Companies	2.4%
Materials	3.1%
Energy	4.5%
Consumer Staples	4.6%
Real Estate	5.1%
Financials	9.2%
Health Care	14.3%
Industrials	16.4%
Information Technology	17.0%
Consumer Discretionary	21.2%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000218314

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc - Permanence Portfolio

Class Name

Trading Symbol

MSHPX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc - Permanence Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$41	0.80%

Expenses Paid, Amount

$ 41

Expense Ratio, Percent

0.80%

AssetsNet

$ 4,355,245

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

29.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$4,355,245
# of Portfolio Holdings	67
Portfolio Turnover Rate	29%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Communication Services	0.6%
Short-Term Investments	1.6%
Investment Companies	2.4%
Materials	3.1%
Energy	4.5%
Consumer Staples	4.6%
Real Estate	5.1%
Financials	9.2%
Health Care	14.3%
Industrials	16.4%
Information Technology	17.0%
Consumer Discretionary	21.2%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000230425

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - U.S. Focus Real Estate Portfolio

Class Name

Trading Symbol

MAAYX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - U.S. Focus Real Estate Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$54	1.10%

Expenses Paid, Amount

$ 54

Expense Ratio, Percent

1.10%

AssetsNet

$ 4,650,517

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

64.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$4,650,517
# of Portfolio Holdings	27
Portfolio Turnover Rate	64%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	0.9%
Consumer Discretionary	1.3%
Health Care	2.8%
Real Estate	26.2%
Financials	68.8%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000230426

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - U.S. Focus Real Estate Portfolio

Class Name

Trading Symbol

MABBX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - U.S. Focus Real Estate Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$91	1.85%

Expenses Paid, Amount

$ 91

Expense Ratio, Percent

1.85%

AssetsNet

$ 4,650,517

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

64.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$4,650,517
# of Portfolio Holdings	27
Portfolio Turnover Rate	64%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	0.9%
Consumer Discretionary	1.3%
Health Care	2.8%
Real Estate	26.2%
Financials	68.8%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000230427

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - U.S. Focus Real Estate Portfolio

Class Name

Trading Symbol

MAAWX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - U.S. Focus Real Estate Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$37	0.74%

Expenses Paid, Amount

$ 37

Expense Ratio, Percent

0.74%

AssetsNet

$ 4,650,517

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

64.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$4,650,517
# of Portfolio Holdings	27
Portfolio Turnover Rate	64%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	0.9%
Consumer Discretionary	1.3%
Health Care	2.8%
Real Estate	26.2%
Financials	68.8%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000230424

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - U.S. Focus Real Estate Portfolio

Class Name

Trading Symbol

MABCX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - U.S. Focus Real Estate Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$35	0.70%

Expenses Paid, Amount

$ 35

Expense Ratio, Percent

0.70%

AssetsNet

$ 4,650,517

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

64.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$4,650,517
# of Portfolio Holdings	27
Portfolio Turnover Rate	64%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Short-Term Investments	0.9%
Consumer Discretionary	1.3%
Health Care	2.8%
Real Estate	26.2%
Financials	68.8%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000007739

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - U.S. Real Estate Portfolio

Class Name

Trading Symbol

MUSDX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - U.S. Real Estate Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$52	1.05%

Expenses Paid, Amount

$ 52

Expense Ratio, Percent

1.05%

AssetsNet

$ 26,308,891

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

22.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$26,308,891
# of Portfolio Holdings	35
Portfolio Turnover Rate	22%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Consumer Discretionary	1.0%
Short-Term Investments	1.1%
Health Care	1.3%
Real Estate	28.3%
Financials	68.3%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000155888

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - U.S. Real Estate Portfolio

Class Name

Trading Symbol

MSURX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - U.S. Real Estate Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$90	1.80%

Expenses Paid, Amount

$ 90

Expense Ratio, Percent

1.80%

AssetsNet

$ 26,308,891

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

22.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$26,308,891
# of Portfolio Holdings	35
Portfolio Turnover Rate	22%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Consumer Discretionary	1.0%
Short-Term Investments	1.1%
Health Care	1.3%
Real Estate	28.3%
Financials	68.3%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000007738

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - U.S. Real Estate Portfolio

Class Name

Trading Symbol

MSUSX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - U.S. Real Estate Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$35	0.70%

Expenses Paid, Amount

$ 35

Expense Ratio, Percent

0.70%

AssetsNet

$ 26,308,891

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

22.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$26,308,891
# of Portfolio Holdings	35
Portfolio Turnover Rate	22%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Consumer Discretionary	1.0%
Short-Term Investments	1.1%
Health Care	1.3%
Real Estate	28.3%
Financials	68.3%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000198814

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - U.S. Real Estate Portfolio

Class Name

Trading Symbol

MRETX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - U.S. Real Estate Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class IR	$32	0.65%

Expenses Paid, Amount

$ 32

Expense Ratio, Percent

0.65%

AssetsNet

$ 26,308,891

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

22.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$26,308,891
# of Portfolio Holdings	35
Portfolio Turnover Rate	22%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Consumer Discretionary	1.0%
Short-Term Investments	1.1%
Health Care	1.3%
Real Estate	28.3%
Financials	68.3%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000104301

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - U.S. Real Estate Portfolio

Class Name

Trading Symbol

MSULX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - U.S. Real Estate Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class L	$77	1.55%

Expenses Paid, Amount

$ 77

Expense Ratio, Percent

1.55%

AssetsNet

$ 26,308,891

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

22.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$26,308,891
# of Portfolio Holdings	35
Portfolio Turnover Rate	22%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Consumer Discretionary	1.0%
Short-Term Investments	1.1%
Health Care	1.3%
Real Estate	28.3%
Financials	68.3%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000126911

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - U.S. Real Estate Portfolio

Class Name

Trading Symbol

MURSX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - U.S. Real Estate Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$32	0.65%

Expenses Paid, Amount

$ 32

Expense Ratio, Percent

0.65%

AssetsNet

$ 26,308,891

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

22.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$26,308,891
# of Portfolio Holdings	35
Portfolio Turnover Rate	22%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Consumer Discretionary	1.0%
Short-Term Investments	1.1%
Health Care	1.3%
Real Estate	28.3%
Financials	68.3%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000169221

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - US Core Portfolio

Class Name

Trading Symbol

MUOAX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - US Core Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$59	1.06%

Expenses Paid, Amount

$ 59

Expense Ratio, Percent

1.06%

AssetsNet

$ 313,599,618

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

15.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$313,599,618
# of Portfolio Holdings	35
Portfolio Turnover Rate	15%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Materials	1.0%
Utilities	1.0%
Short-Term Investments	1.2%
Energy	2.8%
Health Care	4.4%
Consumer Staples	7.9%
Industrials	8.2%
Consumer Discretionary	8.9%
Communication Services	9.4%
Financials	23.2%
Information Technology	32.0%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000169222

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - US Core Portfolio

Class Name

Trading Symbol

MUOCX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - US Core Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$100	1.82%

Expenses Paid, Amount

$ 100

Expense Ratio, Percent

1.82%

AssetsNet

$ 313,599,618

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

15.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$313,599,618
# of Portfolio Holdings	35
Portfolio Turnover Rate	15%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Materials	1.0%
Utilities	1.0%
Short-Term Investments	1.2%
Energy	2.8%
Health Care	4.4%
Consumer Staples	7.9%
Industrials	8.2%
Consumer Discretionary	8.9%
Communication Services	9.4%
Financials	23.2%
Information Technology	32.0%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000169220

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - US Core Portfolio

Class Name

Trading Symbol

MUOIX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - US Core Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$44	0.80%

Expenses Paid, Amount

$ 44

Expense Ratio, Percent

0.80%

AssetsNet

$ 313,599,618

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

15.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$313,599,618
# of Portfolio Holdings	35
Portfolio Turnover Rate	15%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Materials	1.0%
Utilities	1.0%
Short-Term Investments	1.2%
Energy	2.8%
Health Care	4.4%
Consumer Staples	7.9%
Industrials	8.2%
Consumer Discretionary	8.9%
Communication Services	9.4%
Financials	23.2%
Information Technology	32.0%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000169223

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - US Core Portfolio

Class Name

Trading Symbol

MUOSX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - US Core Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$42	0.75%

Expenses Paid, Amount

$ 42

Expense Ratio, Percent

0.75%

AssetsNet

$ 313,599,618

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

15.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$313,599,618
# of Portfolio Holdings	35
Portfolio Turnover Rate	15%

Holdings [Text Block]

Sector Allocation (% of total investments)

Value	Value
Materials	1.0%
Utilities	1.0%
Short-Term Investments	1.2%
Energy	2.8%
Health Care	4.4%
Consumer Staples	7.9%
Industrials	8.2%
Consumer Discretionary	8.9%
Communication Services	9.4%
Financials	23.2%
Information Technology	32.0%

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000233003

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Vitality Portfolio

Class Name

Trading Symbol

MSVEX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Vitality Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$62	1.29%

Expenses Paid, Amount

$ 62

Expense Ratio, Percent

1.29%

AssetsNet

$ 2,131,220

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

6.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$2,131,220
# of Portfolio Holdings	39
Portfolio Turnover Rate	6%

Holdings [Text Block]

Industry Weightings (% of total investments)

Value	Value
Other^{Footnote Reference1}	1.3%
Health Care Technology	5.0%
Health Care Providers & Services	7.7%
Short-Term Investments	9.4%
Health Care Equipment & Supplies	12.4%
Pharmaceuticals	15.5%
Life Sciences Tools & Services	18.7%
Biotechnology	30.0%

Footnote	Description
Footnote¹	Industries and/or investment types representing less than 5% of total investments.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000233004

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Vitality Portfolio

Class Name

Trading Symbol

MSVMX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Vitality Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$98	2.04%

Expenses Paid, Amount

$ 98

Expense Ratio, Percent

2.04%

AssetsNet

$ 2,131,220

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

6.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$2,131,220
# of Portfolio Holdings	39
Portfolio Turnover Rate	6%

Holdings [Text Block]

Industry Weightings (% of total investments)

Value	Value
Other^{Footnote Reference1}	1.3%
Health Care Technology	5.0%
Health Care Providers & Services	7.7%
Short-Term Investments	9.4%
Health Care Equipment & Supplies	12.4%
Pharmaceuticals	15.5%
Life Sciences Tools & Services	18.7%
Biotechnology	30.0%

Footnote	Description
Footnote¹	Industries and/or investment types representing less than 5% of total investments.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000233002

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Vitality Portfolio

Class Name

Trading Symbol

MSVDX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Vitality Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$45	0.94%

Expenses Paid, Amount

$ 45

Expense Ratio, Percent

0.94%

AssetsNet

$ 2,131,220

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

6.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$2,131,220
# of Portfolio Holdings	39
Portfolio Turnover Rate	6%

Holdings [Text Block]

Industry Weightings (% of total investments)

Value	Value
Other^{Footnote Reference1}	1.3%
Health Care Technology	5.0%
Health Care Providers & Services	7.7%
Short-Term Investments	9.4%
Health Care Equipment & Supplies	12.4%
Pharmaceuticals	15.5%
Life Sciences Tools & Services	18.7%
Biotechnology	30.0%

Footnote	Description
Footnote¹	Industries and/or investment types representing less than 5% of total investments.

Material Fund Change [Text Block]

Updated Prospectus Web Address

C000233005

Shareholder Report [Line Items]

Fund Name

Morgan Stanley Institutional Fund, Inc. - Vitality Portfolio

Class Name

Trading Symbol

MSVOX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about Morgan Stanley Institutional Fund, Inc. - Vitality Portfolio for the period of January 1, 2024 to June 30, 2024.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.morganstanley.com/im/shareholderreports. You can also request this information by contacting us at 1-800-869-6397.

Additional Information Phone Number

1-800-869-6397

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$43	0.89%

Expenses Paid, Amount

$ 43

Expense Ratio, Percent

0.89%

AssetsNet

$ 2,131,220

Holdings Count | Holding

InvestmentCompanyPortfolioTurnover

6.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets	$2,131,220
# of Portfolio Holdings	39
Portfolio Turnover Rate	6%

Holdings [Text Block]

Industry Weightings (% of total investments)

Value	Value
Other^{Footnote Reference1}	1.3%
Health Care Technology	5.0%
Health Care Providers & Services	7.7%
Short-Term Investments	9.4%
Health Care Equipment & Supplies	12.4%
Pharmaceuticals	15.5%
Life Sciences Tools & Services	18.7%
Biotechnology	30.0%

Footnote	Description
Footnote¹	Industries and/or investment types representing less than 5% of total investments.

Material Fund Change [Text Block]

Updated Prospectus Web Address