| Form N-CSR Cover | 6 Months Ended |
| Jun. 30, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSRS |
| Amendment Flag | false |
| Registrant Name | Master Investment Portfolio |
| Entity Central Index Key | 0000915092 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Jun. 30, 2024 |
| Shareholder Report | 6 Months Ended |
| Jun. 30, 2024 USD ($) Holding | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSRS |
| Amendment Flag | false |
| Registrant Name | Master Investment Portfolio |
| Entity Central Index Key | 0000915092 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Jun. 30, 2024 |
| Diversified Equity Master Portfolio | |
| Shareholder Report [Line Items] | |
| Fund Name | Diversified Equity Master Portfolio |
| Class Name | Diversified Equity Master Portfolio |
| No Trading Symbol Flag | true |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report |
| Shareholder Report Annual or Semi-Annual | Semi-Annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Master Portfolio included within the BlackRock Diversified Equity Fund’s additional information blackrock.com/fundreports (800) 441-7762 |
| Additional Information Phone Number | (800) 441-7762 |
| Additional Information Website | blackrock.com/fundreports |
| Expenses [Text Block] | Master Portfolio name Costs of a $10,000 Costs paid as a percentage of a Diversified Equity Master Portfolio $8 0.14% |
| Expenses Paid, Amount | $ 8 |
| Expense Ratio, Percent | 0.14% |
| Net Assets | $ 2,319,887,405 |
| Holdings Count | Holding | 2,360 |
| Investment Company, Portfolio Turnover | 61% |
| Additional Fund Statistics [Text Block] | Key Master Portfolio statistics Net Assets $ % Number of Portfolio Holdings 2,360 Portfolio Turnover Rate 61% |
| Holdings [Text Block] | What did the Master Portfolio invest in? (as of June 30, 2024) Sector allocation Sector (a) Percent of Information Technology 22.5% Financials 14.6 Industrials 11.4 Health Care 10.8 Consumer Discretionary 9.3 Communication Services 6.2 Consumer Staples 4.4 Energy 3.6 Materials 3.0 Real Estate 1.7 Utilities 1.7 Short-Term Securities 17.2 Liabilities in Excess of Other Assets (6.4) Ten largest holdings Security Percent of (b) Microsoft Corp. 3.1% Apple, Inc. 2.7 NVIDIA Corp. 2.4 Taiwan Semiconductor Manufacturing Co. Ltd. 1.9 Amazon.com, Inc. 1.7 Alphabet, Inc., Class A 1.1 Meta Platforms, Inc., Class A 0.9 Tencent Holdings Ltd. 0.9 Samsung Electronics Co. Ltd. 0.8 Alphabet, Inc., Class C 0.8 (a) For purposes of this report, sector sub-classifications may differ from those utilized for compliance purposes. (b) Excludes short-term securities. |
| Largest Holdings [Text Block] | Ten largest holdings Security Percent of (b) Microsoft Corp. 3.1% Apple, Inc. 2.7 NVIDIA Corp. 2.4 Taiwan Semiconductor Manufacturing Co. Ltd. 1.9 Amazon.com, Inc. 1.7 Alphabet, Inc., Class A 1.1 Meta Platforms, Inc., Class A 0.9 Tencent Holdings Ltd. 0.9 Samsung Electronics Co. Ltd. 0.8 Alphabet, Inc., Class C 0.8 (a) For purposes of this report, sector sub-classifications may differ from those utilized for compliance purposes. (b) Excludes short-term securities. |
| Total International ex U.S. Index Master Portfolio | |
| Shareholder Report [Line Items] | |
| Fund Name | Total International ex U.S. Index Master Portfolio |
| Class Name | Total International ex U.S. Index Master Portfolio |
| No Trading Symbol Flag | true |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report |
| Shareholder Report Annual or Semi-Annual | Semi-Annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Master Portfolio included within the iShares MSCI Total International Index Fund’s additional information blackrock.com/fundreports (800) 441-7762 |
| Additional Information Phone Number | (800) 441-7762 |
| Additional Information Website | blackrock.com/fundreports |
| Expenses [Text Block] | What were the Master Portfolio costs for the last six months? (based on a hypothetical $10,000 investment) Master Portfolio name Costs of a $10,000 Costs paid as a percentage of a Total International ex U.S. Index Master Portfolio $4 0.07% |
| Expenses Paid, Amount | $ 4 |
| Expense Ratio, Percent | 0.07% |
| Net Assets | $ 1,870,993,590 |
| Holdings Count | Holding | 1,940 |
| Investment Company, Portfolio Turnover | 4% |
| Additional Fund Statistics [Text Block] | Key Master Portfolio statistics Net Assets $ Number of Portfolio Holdings 1,940 Portfolio Turnover Rate 4% |
| Holdings [Text Block] | What did the Master Portfolio invest in? (as of June 30, 2024) Geographic allocation Country/Geographic Region Percent of Japan 15.0% United States 9.9 China 7.8 Canada 7.5 United Kingdom 7.1 France 6.2 Taiwan 5.8 India 5.7 Germany 5.6 Australia 5.0 Other # 31.7 Liabilities in Excess of Other Assets (7.3) Ten largest holdings Security Percent of (a) Taiwan Semiconductor Manufacturing Co. Ltd. 2.9% Novo Nordisk A/S, Class B 1.9 ASML Holding NV 1.6 Tencent Holdings Ltd. 1.2 Samsung Electronics Co. Ltd. 1.1 Nestle SA, Class N 1.1 AstraZeneca PLC 1.0 Shell PLC 0.9 Toyota Motor Corp. 0.9 LVMH Moet Hennessy Louis Vuitton SE 0.8 (a) Excludes short-term securities. # Ten largest country/geographic regions are presented. Additional country/geographic regions are found in Other. |
| Largest Holdings [Text Block] | Ten largest holdings Security Percent of (a) Taiwan Semiconductor Manufacturing Co. Ltd. 2.9% Novo Nordisk A/S, Class B 1.9 ASML Holding NV 1.6 Tencent Holdings Ltd. 1.2 Samsung Electronics Co. Ltd. 1.1 Nestle SA, Class N 1.1 AstraZeneca PLC 1.0 Shell PLC 0.9 Toyota Motor Corp. 0.9 LVMH Moet Hennessy Louis Vuitton SE 0.8 (a) Excludes short-term securities. # Ten largest country/geographic regions are presented. Additional country/geographic regions are found in Other. |
| Large Cap Index Master Portfolio | |
| Shareholder Report [Line Items] | |
| Fund Name | Large Cap Index Master Portfolio |
| Class Name | Large Cap Index Master Portfolio |
| No Trading Symbol Flag | true |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report |
| Shareholder Report Annual or Semi-Annual | Semi-Annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Master Portfolio included within the iShares Russell 1000 Large-Cap Index Fund’s additional information blackrock.com/fundreports (800) 441-7762 |
| Additional Information Phone Number | (800) 441-7762 |
| Additional Information Website | blackrock.com/fundreports |
| Expenses [Text Block] | What were the Master Portfolio costs for the last six months? (based on a hypothetical $10,000 investment) Master Portfolio name Costs of a $10,000 Costs paid as a percentage of a Large Cap Index Master Portfolio $2 0.03% |
| Expenses Paid, Amount | $ 2 |
| Expense Ratio, Percent | 0.03% |
| Net Assets | $ 32,933,015,730 |
| Holdings Count | Holding | 1,011 |
| Investment Company, Portfolio Turnover | 5% |
| Additional Fund Statistics [Text Block] | Key Master Portfolio statistics Net Assets $ Number of Portfolio Holdings 1,011 Portfolio Turnover Rate 5% |
| Holdings [Text Block] | What did the Master Portfolio invest in? (as of June 30, 2024) Sector allocation Sector (a) Percent of Information Technology 30.6% Financials 13.4 Health Care 11.5 Consumer Discretionary 10.1 Communication Services 8.9 Industrials 8.9 Consumer Staples 5.5 Energy 3.7 Materials 2.4 Real Estate 2.4 Utilities 2.1 Short-Term Securities 7.6 Liabilities in Excess of Other Assets (7.1) Ten largest holdings Security Percent of (b) Microsoft Corp. 6.6% Apple, Inc. 6.1 NVIDIA Corp. 5.8 Amazon.com, Inc. 3.5 Meta Platforms, Inc., Class A 2.2 Alphabet, Inc., Class A 2.1 Alphabet, Inc., Class C 1.8 Eli Lilly & Co. 1.5 Berkshire Hathaway, Inc., Class B 1.5 Broadcom, Inc. 1.4 (a) For purposes of this report, sector sub-classifications may differ from those utilized for compliance purposes. (b) Excludes short-term securities. |
| Largest Holdings [Text Block] | Ten largest holdings Security Percent of (b) Microsoft Corp. 6.6% Apple, Inc. 6.1 NVIDIA Corp. 5.8 Amazon.com, Inc. 3.5 Meta Platforms, Inc., Class A 2.2 Alphabet, Inc., Class A 2.1 Alphabet, Inc., Class C 1.8 Eli Lilly & Co. 1.5 Berkshire Hathaway, Inc., Class B 1.5 Broadcom, Inc. 1.4 (a) For purposes of this report, sector sub-classifications may differ from those utilized for compliance purposes. (b) Excludes short-term securities. |
| U.S. Total Bond Index Master Portfolio | |
| Shareholder Report [Line Items] | |
| Fund Name | U.S. Total Bond Index Master Portfolio |
| Class Name | U.S. Total Bond Index Master Portfolio |
| No Trading Symbol Flag | true |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report |
| Shareholder Report Annual or Semi-Annual | Semi-Annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Master Portfolio included within the iShares U.S. Aggregate Bond Index Fund’s additional information blackrock.com/fundreports (800) 441-7762 |
| Additional Information Phone Number | (800) 441-7762 |
| Additional Information Website | blackrock.com/fundreports |
| Expenses [Text Block] | What were the Master Portfolio costs for the last six months? (based on a hypothetical $10,000 investment) Master Portfolio name Costs of a $10,000 Costs paid as a percentage of a U.S. Total Bond Index Master Portfolio $2 0.04% |
| Expenses Paid, Amount | $ 2 |
| Expense Ratio, Percent | 0.04% |
| Net Assets | $ 2,802,391,375 |
| Holdings Count | Holding | 7,421 |
| Investment Company, Portfolio Turnover | 54% |
| Additional Fund Statistics [Text Block] | Key Master Portfolio statistics Net Assets $ Number of Portfolio Holdings 7,421 Portfolio Turnover Rate 54% |
| Holdings [Text Block] | Portfolio composition Investment Type Percent of (a) U.S. Treasury Obligations 43.2 % U.S. Government Sponsored Agency Securities 27.7 Corporate Bonds 25.1 Foreign Agency Obligations 2.4 Non-Agency Mortgage-Backed Securities 0.7 Municipal Bonds 0.5 Asset-Backed Securities 0.4 Capital Trusts — (b) Credit quality allocation Credit Rating (c) Percent of (a) AAA/Aaa (d) 74.3 % AA/Aa 2.7 A 11.8 BBB/Baa 11.2 N/R — (b) (a) Excludes short-term securities. (b) Rounds to less than 0.1%. (c) For purposes of this report, credit quality ratings shown above reflect the highest rating assigned by either S&P Global Ratings or Moody’s Investors Service, Inc. if ratings differ. These rating agencies are independent, nationally recognized statistical rating organizations and are widely used. Investment grade ratings are credit ratings of BBB/Baa or higher. Below investment grade ratings are credit ratings of BB/Ba or lower. Investments designated N/R are not rated by either rating agency. Unrated investments do not necessarily indicate low credit quality. Credit quality ratings are subject to change. (d) The investment adviser evaluates the credit quality of unrated investments based upon certain factors including, but not limited to, credit ratings for similar investments and financial analysis of sectors, individual investments and/or issuers. Using this approach, the investment adviser has deemed unrated U.S. Government Sponsored Agency Securities and U.S. Treasury Obligations to be of similar credit quality as investments rated AAA/Aaa. |
| Largest Holdings [Text Block] | Credit quality allocation Credit Rating (c) Percent of (a) AAA/Aaa (d) 74.3 % AA/Aa 2.7 A 11.8 BBB/Baa 11.2 N/R — (b) (a) Excludes short-term securities. (b) Rounds to less than 0.1%. (c) For purposes of this report, credit quality ratings shown above reflect the highest rating assigned by either S&P Global Ratings or Moody’s Investors Service, Inc. if ratings differ. These rating agencies are independent, nationally recognized statistical rating organizations and are widely used. Investment grade ratings are credit ratings of BBB/Baa or higher. Below investment grade ratings are credit ratings of BB/Ba or lower. Investments designated N/R are not rated by either rating agency. Unrated investments do not necessarily indicate low credit quality. Credit quality ratings are subject to change. (d) The investment adviser evaluates the credit quality of unrated investments based upon certain factors including, but not limited to, credit ratings for similar investments and financial analysis of sectors, individual investments and/or issuers. Using this approach, the investment adviser has deemed unrated U.S. Government Sponsored Agency Securities and U.S. Treasury Obligations to be of similar credit quality as investments rated AAA/Aaa. |
| International Tilts Master Portfolio | |
| Shareholder Report [Line Items] | |
| Fund Name | International Tilts Master Portfolio |
| Class Name | International Tilts Master Portfolio |
| No Trading Symbol Flag | true |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report |
| Shareholder Report Annual or Semi-Annual | Semi-Annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Master Portfolio at blackrock.com/fundreports (800) 441-7762 |
| Additional Information Phone Number | (800) 441-7762 |
| Additional Information Website | blackrock.com/fundreports |
| Expenses [Text Block] | What were the Master Portfolio costs for the last six months? (based on a hypothetical $10,000 investment) Master Portfolio name Costs of a $10,000 Costs paid as a percentage of a International Tilts Master Portfolio $21 0.40% |
| Expenses Paid, Amount | $ 21 |
| Expense Ratio, Percent | 0.40% |
| Net Assets | $ 321,929,829 |
| Holdings Count | Holding | 307 |
| Investment Company, Portfolio Turnover | 67% |
| Additional Fund Statistics [Text Block] | Key Master Portfolio statistics Net Assets $ Number of Portfolio Holdings 307 Portfolio Turnover Rate 67% |
| Holdings [Text Block] | What did the Master Portfolio invest in? (as of June 30, 2024) Geographic allocation Country/Geographic Region Percent of Japan 21.2% United States 12.8 United Kingdom 11.3 Germany 10.2 France 7.7 Australia 5.8 Switzerland 5.5 Netherlands 5.1 Denmark 4.5 Spain 4.1 Other # 12.9 Liabilities in Excess of Other Assets (1.1) Ten largest holdings Security Percent of (a) Novo Nordisk A/S, Class B 3.7% ASML Holding NV 3.4 SAP SE 2.3 Novartis AG, Class N 2.3 BHP Group Ltd., Class DI 2.0 Siemens AG, Class N 1.9 Shell PLC 1.9 Mitsubishi UFJ Financial Group, Inc. 1.7 Tokyo Electron Ltd. 1.7 Allianz SE 1.7 (a) Excludes short-term securities. # Ten largest country/geographic regions are presented. Additional country/geographic regions are found in Other. |
| Largest Holdings [Text Block] | Ten largest holdings Security Percent of (a) Novo Nordisk A/S, Class B 3.7% ASML Holding NV 3.4 SAP SE 2.3 Novartis AG, Class N 2.3 BHP Group Ltd., Class DI 2.0 Siemens AG, Class N 1.9 Shell PLC 1.9 Mitsubishi UFJ Financial Group, Inc. 1.7 Tokyo Electron Ltd. 1.7 Allianz SE 1.7 (a) Excludes short-term securities. # Ten largest country/geographic regions are presented. Additional country/geographic regions are found in Other. |
| Shareholder Report, Holdings (Details) | Jun. 30, 2024 | |
| Novo Nordisk A/S, Class B [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 3.70% | [1] |
| ASML Holding NV [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 3.40% | [1] |
| SAP SE [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2.30% | [1] |
| Novartis AG, Class N [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2.30% | [1] |
| BHP Group Ltd., Class DI [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2% | [1] |
| Siemens AG, Class N [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.90% | [1] |
| Shell PLC [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.90% | [1] |
| Mitsubishi UFJ Financial Group, Inc. [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.70% | [1] |
| Tokyo Electron Ltd. [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.70% | [1] |
| Allianz SE [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.70% | [1] |
| International Tilts Master Portfolio | JAPAN | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 21.20% | |
| International Tilts Master Portfolio | UNITED STATES | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 12.80% | |
| International Tilts Master Portfolio | UNITED KINGDOM | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 11.30% | |
| International Tilts Master Portfolio | GERMANY | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 10.20% | |
| International Tilts Master Portfolio | FRANCE | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 7.70% | |
| International Tilts Master Portfolio | AUSTRALIA | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 5.80% | |
| International Tilts Master Portfolio | SWITZERLAND | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 5.50% | |
| International Tilts Master Portfolio | NETHERLANDS | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 5.10% | |
| International Tilts Master Portfolio | DENMARK | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 4.50% | |
| International Tilts Master Portfolio | SPAIN | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 4.10% | |
| International Tilts Master Portfolio | Other [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 12.90% | [2] |
| International Tilts Master Portfolio | Liabilities in Excess of Other Assets [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | (1.10%) | |
| U.S. Total Bond Index Master Portfolio | AAA/Aaa [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 74.30% | [1],[3],[4] |
| U.S. Total Bond Index Master Portfolio | AA/Aa [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 2.70% | [1],[3] |
| U.S. Total Bond Index Master Portfolio | A [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 11.80% | [1],[3] |
| U.S. Total Bond Index Master Portfolio | BBB/Baa [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 11.20% | [1],[3] |
| U.S. Total Bond Index Master Portfolio | N/R [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0% | [1],[3],[5] |
| U.S. Total Bond Index Master Portfolio | U.S. Treasury Obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 43.20% | [1] |
| U.S. Total Bond Index Master Portfolio | U.S. Government Sponsored Agency Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 27.70% | [1] |
| U.S. Total Bond Index Master Portfolio | Corporate Bonds [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 25.10% | [1] |
| U.S. Total Bond Index Master Portfolio | Foreign Agency Obligations [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 2.40% | [1] |
| U.S. Total Bond Index Master Portfolio | NonAgency MortgageBacked Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.70% | [1] |
| U.S. Total Bond Index Master Portfolio | Municipal Bonds [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.50% | [1] |
| U.S. Total Bond Index Master Portfolio | Asset-Backed Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0.40% | [1] |
| U.S. Total Bond Index Master Portfolio | Capital Trusts [Member] | ||
| Holdings [Line Items] | ||
| Percent of Total Investments | 0% | [1],[5] |
| Large Cap Index Master Portfolio | Microsoft Corp. [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 6.60% | [1] |
| Large Cap Index Master Portfolio | Apple, Inc. [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 6.10% | [1] |
| Large Cap Index Master Portfolio | NVIDIA Corp. [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 5.80% | [1] |
| Large Cap Index Master Portfolio | Amazon.com, Inc. [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 3.50% | [1] |
| Large Cap Index Master Portfolio | Meta Platforms, Inc., Class A [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2.20% | [1] |
| Large Cap Index Master Portfolio | Alphabet, Inc., Class A [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2.10% | [1] |
| Large Cap Index Master Portfolio | Alphabet, Inc., Class C [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.80% | [1] |
| Large Cap Index Master Portfolio | Eli Lilly & Co. [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.50% | [1] |
| Large Cap Index Master Portfolio | Berkshire Hathaway, Inc., Class B [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.50% | [1] |
| Large Cap Index Master Portfolio | Broadcom, Inc. [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.40% | [1] |
| Large Cap Index Master Portfolio | Information Technology Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 30.60% | [6] |
| Large Cap Index Master Portfolio | Financial Services Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 13.40% | [6] |
| Large Cap Index Master Portfolio | Healthcare Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 11.50% | [6] |
| Large Cap Index Master Portfolio | Consumer Discretionary Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 10.10% | [6] |
| Large Cap Index Master Portfolio | Commercial and Industrial Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 8.90% | [6] |
| Large Cap Index Master Portfolio | Industrial Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 8.90% | [6] |
| Large Cap Index Master Portfolio | Consumer Staples Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 5.50% | [6] |
| Large Cap Index Master Portfolio | Energy Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 3.70% | [6] |
| Large Cap Index Master Portfolio | Materials Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2.40% | [6] |
| Large Cap Index Master Portfolio | Real Estate Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2.40% | [6] |
| Large Cap Index Master Portfolio | Utilities Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2.10% | [6] |
| Large Cap Index Master Portfolio | Liabilities in Excess of Other Assets [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | (7.10%) | [6] |
| Large Cap Index Master Portfolio | ShortTerm Securities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 7.60% | [6] |
| Total International ex U.S. Index Master Portfolio | Novo Nordisk A/S, Class B [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.90% | [1] |
| Total International ex U.S. Index Master Portfolio | ASML Holding NV [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.60% | [1] |
| Total International ex U.S. Index Master Portfolio | Shell PLC [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.90% | [1] |
| Total International ex U.S. Index Master Portfolio | Taiwan Semiconductor Manufacturing Co. Ltd. [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2.90% | [1] |
| Total International ex U.S. Index Master Portfolio | Tencent Holdings Ltd. [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.20% | [1] |
| Total International ex U.S. Index Master Portfolio | Samsung Electronics Co. Ltd. [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.10% | [1] |
| Total International ex U.S. Index Master Portfolio | Nestle SA, Class N [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.10% | [1] |
| Total International ex U.S. Index Master Portfolio | AstraZeneca PLC [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1% | [1] |
| Total International ex U.S. Index Master Portfolio | Toyota Motor Corp. [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.90% | [1] |
| Total International ex U.S. Index Master Portfolio | LVMH Moet Hennessy Louis Vuitton SE [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.80% | [1] |
| Total International ex U.S. Index Master Portfolio | JAPAN | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 15% | |
| Total International ex U.S. Index Master Portfolio | UNITED STATES | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 9.90% | |
| Total International ex U.S. Index Master Portfolio | UNITED KINGDOM | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 7.10% | |
| Total International ex U.S. Index Master Portfolio | GERMANY | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 5.60% | |
| Total International ex U.S. Index Master Portfolio | FRANCE | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 6.20% | |
| Total International ex U.S. Index Master Portfolio | AUSTRALIA | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 5% | |
| Total International ex U.S. Index Master Portfolio | CHINA | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 7.80% | |
| Total International ex U.S. Index Master Portfolio | CANADA | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 7.50% | |
| Total International ex U.S. Index Master Portfolio | TAIWAN | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 5.80% | |
| Total International ex U.S. Index Master Portfolio | INDIA | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 5.70% | |
| Total International ex U.S. Index Master Portfolio | Other [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 31.70% | [2] |
| Total International ex U.S. Index Master Portfolio | Liabilities in Excess of Other Assets [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | (7.30%) | |
| Diversified Equity Master Portfolio | Microsoft Corp. [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 3.10% | [1] |
| Diversified Equity Master Portfolio | Apple, Inc. [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2.70% | [1] |
| Diversified Equity Master Portfolio | NVIDIA Corp. [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 2.40% | [1] |
| Diversified Equity Master Portfolio | Amazon.com, Inc. [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.70% | [1] |
| Diversified Equity Master Portfolio | Meta Platforms, Inc., Class A [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.90% | [1] |
| Diversified Equity Master Portfolio | Alphabet, Inc., Class A [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.10% | [1] |
| Diversified Equity Master Portfolio | Alphabet, Inc., Class C [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.80% | [1] |
| Diversified Equity Master Portfolio | Taiwan Semiconductor Manufacturing Co. Ltd. [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.90% | [1] |
| Diversified Equity Master Portfolio | Tencent Holdings Ltd. [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.90% | [1] |
| Diversified Equity Master Portfolio | Samsung Electronics Co. Ltd. [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.80% | [1] |
| Diversified Equity Master Portfolio | Information Technology Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 22.50% | [3] |
| Diversified Equity Master Portfolio | Financial Services Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 14.60% | [3] |
| Diversified Equity Master Portfolio | Healthcare Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 10.80% | [3] |
| Diversified Equity Master Portfolio | Consumer Discretionary Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 9.30% | [3] |
| Diversified Equity Master Portfolio | Industrial Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 11.40% | [3] |
| Diversified Equity Master Portfolio | Consumer Staples Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 4.40% | [3] |
| Diversified Equity Master Portfolio | Energy Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 3.60% | [3] |
| Diversified Equity Master Portfolio | Materials Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 3% | [3] |
| Diversified Equity Master Portfolio | Real Estate Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.70% | [3] |
| Diversified Equity Master Portfolio | Utilities Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.70% | [3] |
| Diversified Equity Master Portfolio | Communications Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 6.20% | [3] |
| Diversified Equity Master Portfolio | Other [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 17.20% | [3] |
| Diversified Equity Master Portfolio | Liabilities in Excess of Other Assets [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | (6.40%) | [3] |
| [1]Excludes short-term securities.[2]Ten largest country/geographic regions are presented. Additional country/geographic regions are found in Other.[3]For purposes of this report, credit quality ratings shown above reflect the highest rating assigned by either S&P Global Ratings or Moody’s Investors Service, Inc. if ratings differ. These rating agencies are independent, nationally recognized statistical rating organizations and are widely used. Investment grade ratings are credit ratings of BBB/Baa or higher. Below investment grade ratings are credit ratings of BB/Ba or lower. Investments designated N/R are not rated by either rating agency. Unrated investments do not necessarily indicate low credit quality. Credit quality ratings are subject to change.[4]The investment adviser evaluates the credit quality of unrated investments based upon certain factors including, but not limited to, credit ratings for similar investments and financial analysis of sectors, individual investments and/or issuers. Using this approach, the investment adviser has deemed unrated U.S. Government Sponsored Agency Securities and U.S. Treasury Obligations to be of similar credit quality as investments rated AAA/Aaa.[5]Rounds to less than 0.1%.[6]For purposes of this report, sector sub-classifications may differ from those utilized for compliance purposes. | ||
