Change in net unrealized investment gains Change in net unrealized investment gains Unrealized Gain (Loss) on Investments Significant Accounting Policies Significant Accounting Policies [Text Block] Dividends payable to Trust Beneficiaries Dividends Payable To Trust Beneficiaries Carrying value as of the balance sheet date of the liability for dividends that are payable to Beneficiaries. Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Net realized investment gains Realized Investment Gains (Losses) Award Timing Predetermined Award Timing Predetermined [Flag] Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Entity File Number Entity File Number Title Trading Arrangement, Individual Title Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Tabular List, Table Tabular List [Table Text Block] Restatement Determination Date: Restatement Determination Date [Axis] Non-PEO NEO Non-PEO NEO [Member] Name Trading Arrangement, Individual Name Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Adjustment to Compensation: Adjustment to Compensation [Axis] All Award Types Award Type [Domain] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Equity Awards Adjustments Equity Awards Adjustments [Member] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Compensation Amount Outstanding Recovery Compensation Amount Net investment gains (losses): Gain (Loss) on Investments [Abstract] Trust Interests Trust Interests Held in Trust Value of Trust Interests held in trust. Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Share Repurchase Program [Axis] Share Repurchase Program [Axis] Adjustment to Compensation, Amount Adjustment to Compensation Amount MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Name Awards Close in Time to MNPI Disclosures, Individual Name Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Common Stock Repurchase Authorizations [Table] Common Stock Repurchase Authorizations [Table] Common Stock Repurchase Authorizations [Table] Employee Stock Option Share-Based Payment Arrangement, Option [Member] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Total increase (decrease) in net assets Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital Cost of Trust Interests redeemed Cost of Trust Interests redeemed Cost related to the redemption of Trust interests. ICFR Auditor Attestation Flag ICFR Auditor Attestation Flag Documents Incorporated by Reference [Text Block] Documents Incorporated by Reference [Text Block] Operations Significant Changes in Operations [Abstract] Insider Trading Policies and Procedures [Line Items] Net unrealized investment gains Accumulated Other Comprehensive Income (Loss), Net of Tax Auditor Firm ID Auditor Firm ID From net investment income Distributions to holders of Trust Interests from net investment income Distributions to holders of Trust Interests from net investment income. Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Cover [Abstract] Cover [Abstract] Accounting Policies [Abstract] Accounting Policies [Abstract] Net assets consist of: Net assets Net Assets [Abstract] Net Assets Company Selected Measure Name Company Selected Measure Name Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Pay vs Performance Disclosure [Line Items] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Audit Information [Abstract] Audit Information Net increase (decrease) in net assets resulting from operations Net Increase (Decrease) In Net Assets Resulting From Operations Net change in net assets resulting from operations Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Liabilities Liabilities [Abstract] Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] All Executive Categories All Executive Categories [Member] Demutualization by Insurance Entity, Securities Issued, Quantity of Shares Demutualization by Insurance Entity, Securities Issued, Quantity of Shares Entity Shell Company Entity Shell Company Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] Common Stock, Number of Shares, Par Value and Other Disclosure [Abstract] Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Company Selected Measure Amount Company Selected Measure Amount Cash Cash Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Entity Small Business Entity Small Business Payable for Trust Interests redeemed Payable For Trusts Interests redeemed Carrying value as of the balance sheet for interest redeemed from trust. May2023Authorization2 May2023Authorization2 [Member] May 2023 treasury stock authorization 2 Name Measure Name Dividends receivable from MetLife, Inc. Other Receivables Document Transition Report Document Transition Report Common Stock Repurchase Authorizations [Line Items] Common Stock Repurchase Authorizations [Line Items] [Line Items] for Common Stock Repurchase Authorizations [Table] Document Fiscal Period Focus Document Fiscal Period Focus Underlying Securities Award Underlying Securities Amount Distributions to holders of Trust Interests Distributions to holders of Trust Interests [Abstract] Distributions to holders of Trust Interests [Abstract] Document Period End Date Document Period End Date Award Timing Method Award Timing Method [Text Block] PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Award Type Award Type [Axis] Beneficiary Voting Rights [Abstract] Beneficiary Voting Rights [Abstract] Beneficiary Voting Rights [Abstract] Legal Entity [Axis] Legal Entity [Axis] Total assets Assets Trusts Interests Outstanding Balance at January 1, Balance at December 31, Trust Interests Outstanding Trust Interests Outstanding Total number of Trust Interests held by Beneficiaries. Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] MetLife, Inc. [Member] Metlife Inc [Member] MetLife, Inc. Income Tax Income Tax, Policy [Policy Text Block] Entity Address, City or Town Entity Address, City or Town Document Type Document Type Common Stock Repurchase Authorizations Common Stock Repurchase Authorizations [Table Text Block] [Table Text Block] for Common Stock Repurchase Authorizations [Table] Name Outstanding Recovery, Individual Name Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Trust Interests escheated Trust Interests Escheated Total number of Trust Interests that have been escheated. All Individuals All Individuals [Member] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Name Forgone Recovery, Individual Name Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Entity Emerging Growth Company Entity Emerging Growth Company Trust Interests Entity Common Stock, Shares Outstanding Share Repurchase Program, Authorized, Amount Share Repurchase Program, Authorized, Amount Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Document Financial Statement Error Correction [Flag] Document Financial Statement Error Correction [Flag] Amount Of Minimum Purchase Requirement Amount Of Minimum Purchase Requirement Amount of minimum purchase requirement. Cost of Trust Interests issued Cost of Trust Interests issued Cost related to the issuance of Trust interests. Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Share Repurchase Program [Domain] Share Repurchase Program [Domain] Net asset value per Trust Interest of ($8,360,949/105,915,235) and ($9,136,810/111,587,813) at December 31, 2025 and 2024, respectively Net Asset Value Reflects offering price and redemption price per Trust Interest. PEO PEO [Member] Loss Contingency, Pending Claims, Number Loss Contingency, Pending Claims, Number Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Net decrease in net assets resulting from Trust Interests transactions Assets Net From Trust Interests Transactions The net of assets and liabilities from Trust Interests transactions. Entity Number of Employees Entity Number of Employees Purchase and Sale Program Purchase and Sale Program [Text Block] The entire disclosure for Purchase and Sale Program. Trust Interests transactions Trust Interests transactions [Abstract] Trust Interests transactions [Abstract] Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Maximum Trust Interests Per Beneficiary Maximum Trust Interests Per Beneficiary Maximum trust interests per beneficiary. From net realized investment gains Distributions to holders of Trust Interests from net realized investment gains Distributions to holders of Trust Interests from net realized investment gains. Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Percentage Of Outstanding Shares Of Common Stock Owned By The Trust Percentage Of Outstanding Shares Of Common Stock Owned By The Trust Percentage Of Outstanding Shares Of Common Stock Owned By The Trust Cost of Trust Interests escheated Cost Of Trust Interests Escheated Cost related to the escheatment of trust interests. Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date Income Statement [Abstract] Income Statement [Abstract] Payable for equity securities purchased Accounts Payable Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Trust Interests rollforward: Supplemental Information [Abstract] Supplemental Information [Abstract] Auditor Location Auditor Location Trustee Fees Trustee Fees Net investment income Net investment income Net Investment Income Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Title of 12(g) Security Title of 12(g) Security City Area Code City Area Code Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Receivable From Metlife, Inc. and Dividends Payable To Trust Beneficiaries Receivable From Metlife Dividends Payable To Trust Beneficiaries [Policy Text Block] Receivable from Metlife dividends payable to trust beneficiaries policy. All Trading Arrangements All Trading Arrangements [Member] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Repurchase Shares Treasury Stock, Shares, Acquired Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Award Timing Disclosures [Line Items] Out-of-pocket expenses General and Administrative Expense Trust Interests withdrawn Trust Interests Withdrawn Total number of Trust Interests that have been withdrawn. Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Trust Termination [Abstract] Trust Termination [Abstract] Trust Termination [Abstract] Equity securities, at estimated fair value Equity Securities, FV-NI Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Expiration Date Trading Arrangement Expiration Date PEO Total Compensation Amount PEO Total Compensation Amount Total net investment gains (losses) Gain (Loss) on Investments Auditor Name Auditor Name Adoption Date Trading Arrangement Adoption Date Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Entity Current Reporting Status Entity Current Reporting Status Purchase And Sale Program [Abstract] Purchase And Sale Program [Abstract] Purchase And Sale Program [Abstract] Cost of Trust Interests withdrawn Cost Of Trust Interests Withdrawn Cost related to the withdrawal of Trust interests. Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Other Performance Measure, Amount Other Performance Measure, Amount Entity Address, State or Province Entity Address, State or Province Equity Securities Marketable Securities, Policy [Policy Text Block] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Executive Category: Executive Category [Axis] Individual: Individual [Axis] Current Fiscal Year End Date Current Fiscal Year End Date Document Annual Report Document Annual Report Entities [Table] Entities [Table] Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Entity [Domain] Entity [Domain] Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Audit Fees Professional Fees Document Fiscal Year Focus Document Fiscal Year Focus Basis of Accounting Basis of Accounting, Policy [Policy Text Block] Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Entity Interactive Data Current Entity Interactive Data Current Trust, Change in Net Assets [Abstract] Trust, Change in Net Assets Contingencies Legal Matters and Contingencies [Text Block] All Adjustments to Compensation All Adjustments to Compensation [Member] Amendment Flag Amendment Flag Beneficiary Voting Rights Beneficiary Voting Rights [Text Block] The entire disclosure for Beneficiary Voting Rights. Decrease in net assets resulting from distributions Total Distributions Total distributions to holders of Trust Interests. Termination Date Trading Arrangement Termination Date Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Measure: Measure [Axis] Net assets Net assets available for Trust Interests outstanding Net asset value Beginning of year End of year Net Assets Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Share Repurchase Program, Remaining Authorized, Amount Share Repurchase Program, Remaining Authorized, Amount Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Entity Central Index Key Entity Central Index Key PEO Name PEO Name Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Entity Tax Identification Number Entity Tax Identification Number Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Percentage Of Outstanding Shares Of Common Stock Owned By The Trust, Termination Eligible Percentage Of Outstanding Shares Of Common Stock Owned By The Trust, Termination Eligible Percentage of outstanding shares of common stock owned by the Trust when eligible for termination. Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Trust Interests issued Trust Interests Issued During Period, New Issues Number of Trust Interests issued during the period. May2023Authorization May2023Authorization [Member] May 2023 treasury stock authorization May2024Authorization May2024Authorization [Member] May 2024 treasury stock authorization Arrangement Duration Trading Arrangement Duration Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Common Stock, Par or Stated Value Per Share Common Stock, Par or Stated Value Per Share April2025Authorization April2025Authorization [Member] April 2025 treasury stock authorization Exercise Price Award Exercise Price Entity Filer Category Entity Filer Category Local Phone Number Local Phone Number Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Entity Public Float Entity Public Float Trading Arrangement: Trading Arrangement [Axis] Total Shareholder Return Amount Total Shareholder Return Amount Assets Assets [Abstract] Insider Trading Arrangements [Line Items] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Common Stock Repurchase Authorizations [Abstract] Common Stock Repurchase Authorizations [Abstract] Common Stock Repurchase Authorizations [Abstract] Trust Interests redeemed Trust Interests redeemed Trust Interests Redeemed Total number of Trust Interests that have been redeemed. Total liabilities Liabilities Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Class of Stock Disclosures [Abstract] Class of Stock Disclosures [Abstract] Percentage Of Outstanding Shares Of Common Stock Owned By The Trust, Termination Required Percentage Of Outstanding Shares Of Common Stock Owned By The Trust, Termination Required Percentage of outstanding shares of common stock owned by the Trust when termination is required. Entity Address, Address Line One Entity Address, Address Line One Treasury Stock, Value, Acquired, Cost Method Treasury Stock, Value, Acquired, Cost Method Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Operating Expenses [Abstract] Operating Expenses [Abstract] Entity Voluntary Filers Entity Voluntary Filers Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Statement [Line Items] Statement [Line Items] Fair Value as of Grant Date Award Grant Date Fair Value Cost of Equity securities Equity Securities, FV-NI, Cost Receivable for equity securities sold Accounts Receivable, after Allowance for Credit Loss Entity Registrant Name Entity Registrant Name Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member]