Gains (losses) from fair value adjustment on public equities Unrealized Gain (Loss) on Investments Range [Domain] Statistical Measurement [Domain] Schedule of Aggregate Fair Value and Gross Unrealized Depreciation of Fixed Maturity Securities by Contractual Maturity Debt Securities, Available-for-Sale [Table Text Block] Fixed maturities Realized Investment Gains (Losses) Gross investment income before adjustments Gross Investment Income Before Adjustment Gross Investment Income Before Adjustment Fixed maturities, amortized cost Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss Prior year losses Prior Year Claims and Claims Adjustment Expense Amortized Cost Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date [Abstract] Corporate securities Debt Security, Corporate, US [Member] Award Timing Predetermined Award Timing Predetermined [Flag] Asset Class [Axis] Asset Class [Axis] Deferred tax benefit (expense) OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, Tax Entity File Number Entity File Number ADDITIONAL PAID-IN CAPITAL: Additional Paid-in Capital [Member] Included in other comprehensive income (loss) Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) Commitments to fund investments Commitments to Fund Investments Commitments to Fund Investments Reclassification adjustment for realized losses (gains) included in net income (loss) Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax Tabular List, Table Tabular List [Table Text Block] Unearned premium reserve Unearned Premiums Adoption of New Accounting Standards and Future Adoption of Recently Issued Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] Schedule of Changes in Net Unrealized Appreciation (Depreciation) for the Company's Investments Unrealized Appreciation Depreciation Of Investments [Table Text Block] Unrealized Appreciation Depreciation Of Investments [Table Text Block] Schedule of Disposal Groups, Including Discontinued Operations Disposal Groups, Including Discontinued Operations [Table Text Block] Schedule of Fair Value Measurement Levels for all Assets and Liabilities Fair Value, by Balance Sheet Grouping [Table Text Block] Debt Securities Debt Securities [Member] Other Comprehensive Income (Loss), Tax [Abstract] Other Comprehensive Income (Loss), Tax [Abstract] Bermuda Re Wells Fargo Bank Bilateral Letter of Credit Facility Total Bermuda Re Wells Fargo Bank Bilateral LOC Facility Bermuda Re Wells Fargo Bank Bilateral Letter of Credit Facility [Member] Bermuda Re Wells Fargo Bank Bilateral Letter of Credit Facility [Member] Unrealized Depreciation Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Share-Based Payment Arrangement, Noncash Expense [Abstract] Share-Based Payment Arrangement, Noncash Expense [Abstract] Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Measurement Basis [Axis] Measurement Basis [Axis] Basic (in dollars per share) Earnings Per Share, Basic Adjustment to Compensation: Adjustment to Compensation [Axis] Schedule of Outstanding Letters of Credit and Borrowings Schedule of Line of Credit Facilities [Table Text Block] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Legacy Legacy Segment [Member] Legacy Segment Catastrophic Event [Axis] Catastrophic Event [Axis] Fixed maturity securities – held to maturity Debt Securities, Held-to-Maturity, Maturity [Abstract] Purchases, issuances and settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) Share purchased by employees Stock Issued During Period, Shares, Employee Stock Purchase Plans Aggregate purchase price Revenue, Remaining Performance Obligation, Amount Due after one year through five years Debt Securities, Held-to-Maturity, Amortized Cost Excluding Accrued Interest, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year One through Five Unrealized Appreciation Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain Total assets held-for-sale Disposal Group, Including Discontinued Operation, Assets Adjustment to Compensation, Amount Adjustment to Compensation Amount Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] Percentage of overall fair value of fixed maturity securities available for sale, less than Concentration Risk, Percentage The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) Underwriting gain (loss) Underwriting Income (Loss) Consolidation Consolidation, Policy [Policy Text Block] Non-cash compensation expense Share-Based Payment Arrangement, Noncash Expense Maximum amount available under FHLB Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available Employee Stock Option Share-Based Payment Arrangement, Option [Member] Bermuda Re Citibank Letter of Credit Facility - Uncommitted Bermuda Re Citibank LOC Facility - Uncommitted [Member] Bermuda Re Citibank LOC Facility - Uncommitted [Member] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Everest Reinsurance Company (Everest Re) Everest Reinsurance Company (Everest Re) [Member] Everest Reinsurance Company (Everest Re) Total shareholders' equity Balance beginning of period Balance ending of period Equity, Attributable to Parent OCI before reclassifications OCI, before Reclassifications, Net of Tax, Attributable to Parent Due after five years through ten years Debt Securities, Held-to-Maturity, Amortized Cost Excluding Accrued Interest, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 5 through 10 Debt Securities, Available-for-Sale [Table] Debt Securities, Available-for-Sale [Table] Other comprehensive income (loss), net of tax: Other Comprehensive Income (Loss), Net of Tax [Abstract] Insider Trading Policies and Procedures [Line Items] Schedule of Roll Forward of Allowance for Credit Losses of Fixed Maturities, Available for Sale Debt Securities, Available-for-Sale, Allowance for Credit Loss [Table Text Block] Amortized Cost Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date Common shares, authorized (in shares) Common Stock, Shares Authorized Additional monthly consideration Renewal Right Agreement, Additional Monthly Consideration Renewal Right Agreement, Additional Monthly Consideration TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY Liabilities and Equity U.S. Winter Weather Events U.S. Winter Weather Events [Member] U.S. Winter Weather Events Reclassification of benefit plan liability amortization included in net income (loss) Benefit plan net gain (loss) Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Deferred acquisition costs Deferred Policy Acquisition Cost Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Funds held by reinsureds Funds held by reinsureds Funds Held under Reinsurance Agreements, Asset Premiums receivable (net of credit allowances: 2026, $(94); 2025, $(94)) Premiums Receivable, Net Cover [Abstract] Cover [Abstract] Reclassification from AOCI Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Maximum Maximum [Member] Amortized Cost Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss Prior years Prior Year Claims and Claims Adjustment Expense, Excluding Impact From Retroactive Reinsurance Prior Year Claims and Claims Adjustment Expense, Excluding Impact From Retroactive Reinsurance Long-Term Debt, Unclassified [Abstract] Long-Term Debt, Unclassified [Abstract] European Union European Union [Member] Accounting Policies [Abstract] Accounting Policies [Abstract] Non-cash restructure of fixed maturity securities - available for sale and equity securities Noncash Or Part Noncash, Restructure Of Fixed Maturity Securities, Available For Sale And Equity Securities Noncash Or Part Noncash, Restructure Of Fixed Maturity Securities, Available For Sale And Equity Securities Non-cash limited partnership distribution Noncash Or Part Noncash Distribution Made To Limited Partner Noncash Or Part Noncash Distribution Made To Limited Partner Aggregate market value of investments in unrealized loss position Total Debt Securities, Available-for-Sale, Unrealized Loss Position Collateral for FHLB borrowings Cash Collateral for Borrowed Securities Due after ten years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 Restricted Shares Restricted Stock [Member] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Debt Instrument [Line Items] Debt Instrument [Line Items] Foreign exchange/translation adjustment Translation Adjustment Functional to Reporting Currency, Net of Tax, Period Increase (Decrease) Non-cash restructure of fixed maturity securities - available for sale and other invested assets Noncash Or Part Noncash, Restructure Of Fixed Maturity Securities, Available For Sale And Other Invested Assets Noncash Or Part Noncash, Restructure Of Fixed Maturity Securities, Available For Sale And Other Invested Assets Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] TREASURY SHARES AT COST: Treasury Stock, Common [Member] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Pay vs Performance Disclosure [Line Items] Realized losses Gross losses from sales Debt Security, Held-To-Maturity, Sold, Realized Loss Debt Security, Held-To-Maturity, Sold, Realized Loss Increase (decrease) in unearned premiums Increase (Decrease) in Unearned Premiums Foreign currency translation and other adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Bermuda Re Citibank Letter of Credit Facility One Bermuda Re Citibank LOC Facility One Bermuda Re Citibank Letter of Credit Facility One [Member] Bermuda Re Citibank Letter of Credit Facility One [Member] Effects of Reinsurance [Table] Effects of Reinsurance [Table] LIABILITIES: Liabilities [Abstract] Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] INCOME (LOSS) BEFORE TAXES Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Entity Shell Company Entity Shell Company Mt Logan Re Mt Logan Re [Member] Mt Logan Re [Member] Percentage of principal amount required for redemption (in percent) Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed Schedule of Long-Term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Increase (decrease) in reserve for losses and loss adjustment expenses Increase (Decrease) in Liability for Claims and Claims Adjustment Expense Reserve Schedule of Components of Net Investment Income Investment [Table Text Block] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Company Selected Measure Amount Company Selected Measure Amount Cash Cash Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Line of Credit Facility [Table] Line of Credit Facility [Table] COMPREHENSIVE INCOME (LOSS) Comprehensive Income (Loss), Net of Tax, Attributable to Parent Reclassification out of Accumulated Other Comprehensive Income [Table] Reclassification out of Accumulated Other Comprehensive Income [Table] Bermuda Re Citibank LOC Facility Three Bermuda Re Citibank Letter of Credit Facility Three [Member] Bermuda Re Citibank Letter of Credit Facility Three [Member] Disposal Group Name [Domain] Disposal Group Name [Domain] Name Measure Name Due in one year or less Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Line of Credit Facility [Abstract] Line of Credit Facility [Abstract] Legal expenses and merger and acquisition fees Other Nonrecurring Expense Funds at Lloyds Syndicated Letter of Credit Facility Everest International Reinsurance, Ltd. Funds At Lloyds Syndicated Letter Of Credit Facility [Member] Everest International Reinsurance, Ltd. Funds At Lloyds Syndicated Letter Of Credit Facility Total other comprehensive income (loss) Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent Proceeds from fixed maturities matured/called/repaid - available for sale Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-Sale Document Fiscal Period Focus Document Fiscal Period Focus Assumed written premiums Assumed Premiums Written Award Timing Method Award Timing Method [Text Block] Attritional Losses Attritional Losses [Member] Attritional Losses Schedule of Amortized Cost, Allowance for Credit Losses, Gross Unrealized Appreciation/(Depreciation) and Fair Value of Fixed Maturity Securities Unrealized Gain (Loss) on Investments [Table Text Block] Award Type [Axis] Award Type [Axis] Foreign currency translation and other adjustments Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Fixed maturity securities - available for sale Available-for-Sale Securities, Debt Maturities [Abstract] Schedule of Components of Comprehensive Income (Loss) Comprehensive Income (Loss) [Table Text Block] Legal Entity [Axis] Legal Entity [Axis] TOTAL ASSETS Assets Funds at Lloyd's Funds Held In Financial Institution Funds Held In Financial Institution Trading Symbol Trading Symbol Bermuda Re Citibank LOC Facility - Uncommitted Facility One Bermuda Re Citibank LOC Facility - Uncommitted Facility One [Member] Bermuda Re Citibank LOC Facility - Uncommitted Facility One Geographical [Domain] Geographical [Domain] Bermuda Re Citibank LOC Facility Seven Bermuda Re Citibank Letter of Credit Facility Seven [Member] Bermuda Re Citibank Letter of Credit Facility Seven [Member] Entity Address, City or Town Entity Address, City or Town Aggregate renewed premiums Renewal Right Agreement, Purchase Price, Percentage Of Gross Written Premium Equivalent Renewal Right Agreement, Purchase Price, Percentage Of Gross Written Premium Equivalent CASH FLOWS FROM OPERATING ACTIVITIES: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Other nonrecurring income Other Nonrecurring Income EFFECT OF EXCHANGE RATE CHANGES ON CASH Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Federal Home Loan Bank of New York Federal Home Loan Bank of New York [Member] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Severance costs Severance Costs Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Entity Emerging Growth Company Entity Emerging Growth Company Fixed maturities - held to maturity, at amortized cost, fair value Fair Value Debt Securities, Held-to-Maturity, Fair Value Consolidation of Variable Interest Entity Consolidation, Variable Interest Entity, Policy [Policy Text Block] Dividends declared (in dollars per share) Common Stock, Dividends, Per Share, Declared Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding 3.5% Senior notes Senior Notes 3.5% [Member] Senior Notes 3.5% [Member] Debt Securities, Available-for-Sale [Line Items] Debt Securities, Available-for-Sale [Line Items] 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] Prepaid reinsurance premiums Prepaid Reinsurance Premiums Admitted assets for FHLB Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Admitted Assets Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Admitted Assets Significant Other Observable Inputs (Level 2) Fair Value, Inputs, Level 2 [Member] Due after five years through ten years Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Other invested assets Equity Method Investments Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Gross gains from sales Debt Security, Held-To-Maturity, Sold, Realized Gain Debt Security, Held-To-Maturity, Sold, Realized Gain Transaction expenses Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal BASIS OF PRESENTATION Basis of Accounting [Text Block] Common shares, outstanding (in shares) Balance beginning of period (in shares) Balance ending of period (in shares) Common Stock, Shares, Outstanding Insurance [Abstract] Reinsurance, amount retained, per policy Reinsurance, Amount Retained, Per Policy Unrealized Depreciation Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss PEO PEO [Member] Schedule of Amortized Cost and Fair Value of Fixed Maturity Securities, by Contractual Maturity Investments Classified by Contractual Maturity Date [Table Text Block] 4.868% Senior notes Senior Notes 4.868% [Member] Senior Notes 4.868% [Member] Retroactive reinsurance adjustment Policyholder Benefits and Claims Incurred, Retroactive Reinsurance Adjustment Policyholder Benefits and Claims Incurred, Retroactive Reinsurance Adjustment 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] RETAINED EARNINGS: Retained Earnings [Member] Total paid losses and LAE Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid Due after one year through five years Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five Reset quarterly interest rate (in percent) Debt Instrument, Interest Rate, Effective Percentage Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date Cash, beginning of period Cash, end of period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Income Statement [Abstract] Income Statement [Abstract] Income tax expense (benefit) Income tax expense (benefit) Income Tax Expense (Benefit) Greater than 12 months Greater than 12 months Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer OCI before reclassification OCI, before Reclassifications, before Tax, Attributable to Parent Basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate Other assets (net of credit allowances: 2026, $(17); 2025, $(17)) Other invested assets Other Assets Income tax asset, net Disposal Group, Including Discontinued Operation, Deferred Tax Assets Beginning balance of fixed maturities Ending balance of fixed maturities Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Preferred stock, shares issued (in shares) Preferred Stock, Shares Issued Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Incurred related to: Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract] Due in one year or less Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Net investment income Net investment income Net Investment Income Reinsurance, excess retention, amount reinsured, per policy Reinsurance, Excess Retention, Amount Reinsured, Per Policy Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Wells Fargo Bank Bilateral LOC Agreement Three Bermuda Re Wells Fargo Bank Bilateral Letter of Credit Facility Three [Member] Bermuda Re Wells Fargo Bank Bilateral Letter of Credit Facility Three Gross losses from sales Equity Securities, FV-NI, Realized Loss Organization, Consolidation and Presentation of Financial Statements [Abstract] Other Income and Expenses [Abstract] Federal Home Loan Bank Branch [Domain] Federal Home Loan Bank Branch [Domain] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] City Area Code City Area Code Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Reinsurance loss recoverables (net of credit allowances: 2026, $(60); 2025, $(57)) Reinsurance Recoverable for Paid Claims and Claims Adjustments 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] Total gains or (losses) (realized/unrealized) Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings And Other Comprehensive Income [Abstract] Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings And Other Comprehensive Income Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Amounts due to reinsurers Reinsurance Payable Ceded losses and LAE Ceded Losses And Loss Adjustment Expenses Ceded Losses And Loss Adjustment Expenses CASH FLOWS FROM INVESTING ACTIVITIES: Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Non-agency commercial Commercial Mortgage Backed Securities Issued By Private Enterprises [Member] Commercial Mortgage Backed Securities Issued By Private Enterprises Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Total investments and cash Disposal Group, Including Discontinued Operation, Investments And Cash Disposal Group, Including Discontinued Operation, Investments And Cash Net cash provided by (used in) operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Disposal Group, Disposed of by Sale, Not Discontinued Operations Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] Proceeds from fixed maturities sold - available for sale Proceeds from sales of fixed maturity securities - available for sale Proceeds from Sale of Debt Securities, Available-for-Sale Fixed maturities - available for sale, at fair value (amortized cost: 2026, $35,137; 2025, $34,620, credit allowances: 2026, $(53); 2025, $(68)) Fair Value Fair value Debt Securities, Available-for-Sale, Excluding Accrued Interest Agency residential Residential Mortgage-Backed Security, Issued By US Government-Sponsored Enterprise [Member] Residential Mortgage-Backed Security, Issued By US Government-Sponsored Enterprise Preferred stock, par value per share (in dollars per share) Preferred Stock, Par or Stated Value Per Share Subsequent Event Subsequent Event [Member] Other liabilities Other Liabilities Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Current year Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year Interest, fees and bond issue cost amortization expense Interest, fee and bond issue cost amortization expense Interest, Fee And Bond Issue Cost Amortization Expense Interest, Fee And Bond Issue Cost Amortization Expense PEO Total Compensation Amount PEO Total Compensation Amount Long-Term Debt, Type [Axis] Long-Term Debt, Type [Axis] Net gains (losses) on investments Net (gains) losses on investments Total net gains (losses) on investments Net gains (losses) on investments Net gains (losses) on investments Gain (Loss) on Investments Numerator Net Income (Loss) Available to Common Stockholders, Diluted [Abstract] Reserve For Losses LAE And Future Policy Benefit Reserve [Table] Reserve For Losses LAE And Future Policy Benefit Reserve [Table] Reserve For Losses LAE And Future Policy Benefit Reserve Equity Components [Axis] Equity Components [Axis] GENERAL Nature of Operations [Text Block] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Total investments and cash Investments and Cash Number of reportable segments Number of Reportable Segments Reclassification adjustment for amortization of net (gain) loss included in net income (loss) Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax SUPPLEMENTAL CASH FLOW INFORMATION: Supplemental Cash Flow Information [Abstract] Accrual withholding taxes (in percent) Accrual Withholding Taxes, Percent Accrual Withholding Taxes, Percent Incurred losses and loss adjustment expenses Incurred losses and LAE Policyholder Benefits and Claims Incurred, Net Equity method investments OCI, Equity Method Investment, before Tax, Parent Entity Address, Country Entity Address, Country Other Performance Measure, Amount Other Performance Measure, Amount U.S. Treasury securities and obligations of U.S. government agencies and corporations US Treasury and Government [Member] Catastrophe Catastrophe [Member] Dividends declared ($2.00 per share in 1Q 2026 and $2.00 per share in 1Q 2025) Dividends, Common Stock Effects of Reinsurance [Line Items] Effects of Reinsurance [Line Items] Debt Securities, Available-for-Sale, Allowance for Credit Loss [Table] Debt Securities, Available-for-Sale, Allowance for Credit Loss [Table] Fair Value Fair Value Measurement, Policy [Policy Text Block] Qualifying collateral pledged Financial Instruments, Owned, at Fair Value Less: dividends declared - common shares and unvested common shares Dividends Schedule of Collateralized Reinsurance Agreements Summary of Collateralized Reinsurance Agreements [Table Text Block] Summary of Collateralized Reinsurance Agreements [Table Text Block] MS Transverse Reinsurance MS Transverse Reinsurance [Member] MS Transverse Reinsurance Before Tax Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent [Abstract] Bermuda Re Wells Fargo Bank Bilateral LOC Facility - unsecured tranche Bermuda Re Wells Fargo Bank Bilateral Letter of Credit Facility Unsecured Tranche [Member] Bermuda Re Wells Fargo Bank Bilateral Letter of Credit Facility Unsecured Tranche Individual: Individual [Axis] Restricted cash Restricted Cash Fair Value of Financial Instruments Fair Value of Financial Instruments, Policy [Policy Text Block] Dividends paid to shareholders Payments of Ordinary Dividends, Common Stock Entity [Domain] Entity [Domain] Net cash provided by (used in) investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation 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] Reinsurance, excess retention unexpired limit, amount reinsured, per policy Reinsurance, Excess Retention Unexpired Limit, Amount Reinsured, Per Policy Reinsurance, Excess Retention Unexpired Limit, Amount Reinsured, Per Policy Interest paid Interest Paid, Excluding Capitalized Interest, Operating Activity Document Fiscal Year Focus Document Fiscal Year Focus Maximum exposure to loss Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount Basis of Accounting Basis of Accounting, Policy [Policy Text Block] Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Entity Interactive Data Current Entity Interactive Data Current Gross gains from sales Equity Securities, FV-NI, Realized Gain Amount of borrowed funds required to be used to acquire additional membership stock, percentage Federal Home Loan Bank, Advances, Required to be used to Acquire Additional Membership Stock, Percentage Federal Home Loan Bank, Advances, Required to be used to Acquire Additional Membership Stock, Percentage Market Value Reported Value Measurement [Member] Schedule of Outstanding Fixed to Floating Rate Long Term Subordinated Notes Schedule of Subordinated Borrowing [Table Text Block] Schedule of Interest Expense Incurred in Connection with Long Term Subordinated Notes Schedule of Interest Expense on Long Term Subordinated Notes [Table Text Block] Schedule of Interest Expense on Long Term Subordinated Notes [Table Text Block] Catastrophic Event [Domain] Catastrophic Event [Domain] Bermuda Re Citibank LOC Facility - Uncommitted Facility Three Bermuda Re Citibank LOC Facility - Uncommitted Facility Three [Member] Bermuda Re Citibank LOC Facility - Uncommitted Facility Three Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration] Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration] Senior notes Consolidated Balance Sheet Amount Senior Notes SEGMENT REPORTING Segment Reporting Disclosure [Text Block] Bermuda Re Citibank LOC Facility Five Bermuda Re Citibank Letter of Credit Facility Five [Member] Bermuda Re Citibank Letter of Credit Facility Five [Member] Deferred gain on sale current Deferred Gain On Sale Current Deferred Gain On Sale Current Everest Reinsurance Company (Ireland), Dac Commerzbank Letter of Credit Facility Three Everest Reinsurance Company (Ireland), Dac Commerzbank Letter Of Credit Facility Three [Member] Everest Reinsurance Company (Ireland), Dac Commerzbank Letter Of Credit Facility Three Assumed losses and LAE Assumed Losses And Loss Adjustment Expenses Assumed Losses And Loss Adjustment Expenses Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Gross Unrealized Depreciation Gross Unrealized Depreciation Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract] Impairments of capitalized software Capitalized Computer Software, Impairments Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Everest Reinsurance Company (Ireland), Dac Commerzbank Letter of Credit Facility One Everest Reinsurance Company (Ireland), Dac Commerzbank Letter Of Credit Facility One [Member] Everest Reinsurance Company (Ireland), Dac Commerzbank Letter Of Credit Facility One OTHER COMPREHENSIVE INCOME (LOSS) Comprehensive Income (Loss) Note [Text Block] Senior Notes [Abstract] Senior Notes [Abstract] Everest Reinsurance Company (Ireland), Dac Commerzbank Letter of Credit Facility Two Everest Reinsurance Company (Ireland), Dac Commerzbank Letter Of Credit Facility Two [Member] Everest Reinsurance Company (Ireland), Dac Commerzbank Letter Of Credit Facility Two Everest Canada Everest Canada [Member] Everest Canada Accrual withholding taxes Accrual Withholding Taxes Accrual Withholding Taxes Income tax asset, net Deferred Income Tax Assets, Net Schedule of Components of Accumulated Other Comprehensive Income (Loss), Net of Tax Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Decrease (increase) in income taxes Increase (Decrease) in Income Taxes Receivable Customer [Domain] Customer [Domain] Entity Central Index Key Entity Central Index Key PEO Name PEO Name Total revenues Revenues 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] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Credit allowance on fixed maturity securities Investments, Allowance For (Reversal Of) Credit Loss Investments, Allowance For (Reversal Of) Credit Loss Cost of other invested assets acquired Payments to Acquire Interest in Subsidiaries and Affiliates Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Total incurred losses and LAE Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims Funds held under reinsurance treaties Funds Held under Reinsurance Agreements, Liability Tax benefit resulting from change in U.K. tax law Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount Arrangement Duration Trading Arrangement Duration Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Other Other Credit Derivatives [Member] Fixed maturities - available for sale, at fair value and Short-term investments Disposal Group, Including Discontinued Operation, Investment Net written premiums Premiums Written, Net Premium receivable, net of credit allowances Premium Receivable, Allowance for Credit Loss Basic weighted-average common shares outstanding and unvested common shares expected to vest (in shares) Basic weighted-average common shares outstanding and unvested common shares expected to vest Basic weighted average common shares outstanding and nonvested common shares expected to vest Segments [Axis] Segments [Axis] Additional monthly consideration, term Renewal Right Agreement, Additional Monthly Consideration, Term Renewal Right Agreement, Additional Monthly Consideration, Term 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] Share-based payment award, discount from market price, purchase date (in percent) Share-Based Compensation Arrangement by Share-Based Payment Award, Discount from Market Price, Purchase Date Subsequent Event Type [Axis] Subsequent Event Type [Axis] SHARE-BASED COMPENSATION PLANS Share-Based Payment Arrangement [Text Block] Russia/Ukraine Losses Russia/Ukraine Losses [Member] Russia/Ukraine Losses Nordea Bank Letter of Credit Facility - Uncommitted Bermuda Re Nordea Bank Letter Of Credit Facility Uncommitted [Member] Bermuda Re Nordea Bank Letter Of Credit Facility Uncommitted Disposal retail Insurance operations Disposal Group, Including Discontinued Operation, Consideration ASSETS: Assets [Abstract] Fixed maturity securities - available for sale, held to maturity and short-term investments OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, before Tax Underlying Security Market Price Change Underlying Security Market Price Change, Percent Subordinated Notes Issued 2007 Debt Instrument Two [Member] Debt Instrument Two [Member] Entity Address, Address Line Three Entity Address, Address Line Three Debt Instrument [Axis] Debt Instrument [Axis] Cash Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents FAIR VALUE Fair Value Disclosures [Text Block] Total Bermuda Re Citibank LOC Facility Bermuda Re Citibank Letter of Credit Facility [Member] Bermuda Re Citibank Letter of Credit Facility [Member] SHAREHOLDERS' EQUITY: Equity, Attributable to Parent [Abstract] 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] Total claims and expenses Benefits, Losses and Expenses Gross written premiums Premiums Written, Gross Entity Address, Address Line One Entity Address, Address Line One Entity Address, Address Line Two Entity Address, Address Line Two Purchase of treasury shares Treasury Stock, Value, Acquired, Cost Method Change in equity adjustments in limited partnerships Change In Equity Adjustments In Limited Partnerships Change In Equity Adjustments In Limited Partnerships ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS), NET OF DEFERRED INCOME TAXES: Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] Debt instrument, stated interest rate (in percent) Debt Instrument, Interest Rate, Stated Percentage Net increase (decrease) in cash balances classified as held-for-sale Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation, Classified As Held-For-Sale Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation, Classified As Held-For-Sale Bermuda Re Lloyd’s Bank Letter of Credit Facility - Committed Three Bermuda Re Lloyd’s Bank Letter of Credit Facility - Committed Three [Member] Bermuda Re Lloyd’s Bank Letter of Credit Facility - Committed Three Investments [Domain] Investments [Domain] Credit losses on securities where credit losses were not previously recorded Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss, Not Previously Recorded Collateral for secured letter of credit facilities Debt Securities, Trading, Restricted Fair Value as of Grant Date Award Grant Date Fair Value Entity Registrant Name Entity Registrant Name Undistributed earnings, basic Undistributed Earnings, Basic Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Disposal Group, Held-for-Sale, Not Discontinued Operations Disposal Group, Held-for-Sale, Not Discontinued Operations [Member] Bermuda Re Barclays Credit Facility Two Bermuda Re Barclays Credit Facility Two [Member] Bermuda Re Barclays Credit Facility Two Distribution of limited partnership income Reimbursement from Limited Partnership Investment Total liabilities held-for-sale Disposal Group, Including Discontinued Operation, Liabilities Schedule of Outstanding Senior Notes Schedule of Long-Term Debt Instruments [Table Text Block] ESPP Offering (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Bermuda Re Citibank LOC Facility Thirteen Bermuda Re Citibank Letter of Credit Facility Thirteen [Member] Bermuda Re Citibank Letter of Credit Facility Thirteen Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Document Quarterly Report Document Quarterly Report Less than 12 months Less than 12 months Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months Other Invested Assets Financial Instrument, Other [Member] Common shares issued (redeemed) during the period for share-based compensation, net of expense Payments for Shares Issued for Share-Based Compensation, Net of Expense Payments for (Proceeds from) Shares Issued (Redeemed) for Share-Based Compensation, Net of Expense Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Counterparty Name [Domain] Counterparty Name [Domain] Collateral in trust for non-affiliated agreements Asset, Held-in-Trust Aggregate purchase price, not to exceed Revenue, Remaining Performance Obligation, Variable Consideration, Maximum Contingent Reimbursement If Threshold Not Met Revenue, Remaining Performance Obligation, Variable Consideration, Maximum Contingent Reimbursement If Threshold Not Met Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Accrued investment income Accrued Investment Income Receivable Bermuda Re Citibank LOC Facility - Uncommitted Facility Four Bermuda Re Citibank LOC Facility - Uncommitted Facility Four [Member] Bermuda Re Citibank LOC Facility - Uncommitted Facility Four Reinsurance, excess retention (in percent) Reinsurance, Excess Retention, Percentage Investment Type [Axis] Investment Type [Axis] Weighted-average grant-date fair value of equity awards other than options granted (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Title Trading Arrangement, Individual Title Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Maximum percentage of admitted assets allowed for borrowing base Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Maximum Percentage Of Admitted Assets Allowed For Borrowing Base Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Maximum Percentage Of Admitted Assets Allowed For Borrowing Base Other underwriting expenses Other underwriting expenses Other underwriting expenses Other Underwriting Expense Restatement Determination Date: Restatement Determination Date [Axis] Right to defer interest on one or more occasions for up to number of consecutive years (in years) Debt Instrument Periodic Payment Interest Right Of Deferment Number Of Years Debt Instrument Periodic Payment Interest Right Of Deferment Number Of Years Share-based compensation plans Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture Non-PEO NEO Non-PEO NEO [Member] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Borrowings from FHLB Advance from Federal Home Loan Bank Interest expense Interest Expense, Debt Issuer Issuer Concentration Risk [Member] Issuer [Member] Net change in short-term investments Payments for (Proceeds from) Short-Term Investments Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Unrealized Appreciation Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax Name Trading Arrangement, Individual Name Assets held-for-sale Disposal Group, Including Discontinued Operation, Assets [Abstract] Award Type [Domain] Award Type [Domain] Equity Awards Adjustments Equity Awards Adjustments [Member] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] SALE OF COMMERCIAL RETAIL BUSINESS AND RENEWAL RIGHTS Other Operating Income and Expense [Text Block] Compensation Amount Outstanding Recovery Compensation Amount Principal Amounts Original Principal Amount Debt Instrument, Face Amount Undistributed earnings, diluted Undistributed Earnings, Diluted Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Reduction in allowance due to disposals Debt Securities, Held-To-Maturity, Excluding Accrued Interest, Allowance for Credit Loss, Securities Sold Debt Securities, Held-To-Maturity, Excluding Accrued Interest, Allowance for Credit Loss, Securities Sold Due in five years through ten years Due in Five Years Through Ten Years [Member] Due in Five Years Through Ten Years [Member] Schedule of Activity in the Reserve for Losses and LAE Schedule of Liability for Unpaid Claims and Claims Adjustment Expense [Table Text Block] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Fair Value Estimate of Fair Value Measurement [Member] Percentage allocated to common shareholders Percentage Allocated To Common Shareholders Percentage allocated to common shareholders Total Bermuda Re Lloyd's Bank Credit Facility Bermuda Re Lloyd’s Bank Letter of Credit Facility [Member] Bermuda Re Lloyd’s Bank Letter of Credit Facility [Member] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Due after one year through five years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five Name Awards Close in Time to MNPI Disclosures, Individual Name Collateralized Reinsurance And Trust Agreements [Abstract] Collateralized Reinsurance And Trust Agreements [Abstract] Collateralized Reinsurance And Trust Agreements[Abstract] Bermuda Re Citibank LOC Facility Ten Bermuda Re Citibank Letter of Credit Facility Ten [Member] Bermuda Re Citibank Letter of Credit Facility Ten Denominator Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Reinsurance recoverables, adverse development reinsurance agreement Reinsurance Recoverables, Adverse Development Reinsurance Reinsurance Recoverables, Adverse Development Reinsurance Employee Stock Employee Stock [Member] Net income (loss) available to common stockholders, diluted before dividends, common stock Net Income (Loss) Available to Common Stockholders, Diluted Before Dividends, Common Stock Net Income (Loss) Available to Common Stockholders, Diluted Before Dividends, Common Stock REVENUES: Revenues [Abstract] Total restricted assets Restricted Cash and Investments Due after five years through ten years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Schedule of Restricted Assets Schedule of Financial Instruments Owned and Pledged as Collateral [Table Text Block] Bermuda Re Citibank LOC Facility Nine Bermuda Re Citibank Letter of Credit Facility Nine [Member] Bermuda Re Citibank Letter of Credit Facility Nine Nordea Bank Letter of Credit Facility - Committed Bermuda Re Nordea Bank Letter Of Credit Facility Committed [Member] Bermuda Re Nordea Bank Letter Of Credit Facility Committed Nils Storms Nils Storms [Member] Nils Storms Accumulated other comprehensive income (loss), net of deferred income tax expense (benefit) of $(111) at 2026 and $(23) at 2025 Accumulated Other Comprehensive Income (Loss), Net of Tax Commission, brokerage, taxes and fees Commission and brokerage Selling and Marketing Expense OCI before reclassification Other Comprehensive Income (Loss) before Reclassifications, Tax Change in URA(D), net of deferred taxes, included in shareholders’ equity OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax Financial Instruments [Domain] Financial Instruments [Domain] Due after ten years Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 Reporting Segment [Domain] Segments [Domain] Fixed maturities Fixed maturities Fixed Maturities [Member] Performance Shares Performance Shares [Member] INVESTMENTS Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Liabilities held-for-sale Disposal Group, Including Discontinued Operation, Liabilities [Abstract] Fair Value Plan Asset Measurement [Domain] Fair Value Hierarchy and NAV [Domain] Decrease (increase) in prepaid reinsurance premiums Increase (Decrease) in Prepaid Reinsurance Premiums Other assets Disposal Group, Including Discontinued Operation, Other Assets URA(D) of securities AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member] Partnership Interest Partnership Interest [Member] Company Selected Measure Name Company Selected Measure Name Decrease (increase) in premiums receivable Increase (Decrease) in Premiums Receivable Fair Value Measurement [Domain] Fair Value Measurement [Domain] Senior Notes Senior Notes [Member] Cost of fixed maturities acquired - available for sale Payments to Acquire Debt Securities, Available-for-Sale CREDIT FACILITIES SENIOR NOTES Debt Disclosure [Text Block] Preferred shares, par value: $0.01; 50.0 shares authorized; no shares issued and outstanding Preferred Stock, Value, Issued Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Obligations of U.S. States and political subdivisions US States and Political Subdivisions Debt Securities [Member] Accrued interest on debt and borrowings Interest Payable Long-term notes Consolidated Balance Sheet Amount Subordinated Debt Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Fair Value Debt Securities, Held-to-Maturity, Maturity, Allocated and Single Maturity Date, Fair Value [Abstract] Issuer [Domain] Issuer [Domain] Issuer [Domain] Numerator for diluted earnings per common share Net Income (Loss) Available to Common Stockholders, Diluted Subordinated Debt Subordinated Debt [Member] All Executive Categories All Executive Categories [Member] Current year Current year losses Current Year Claims and Claims Adjustment Expense Assumed earned premiums Assumed Earned Premiums Assumed Earned Premiums Common shares, par value: $0.01; 200.0 shares authorized; 74.5 (2026) and 74.4 (2025) shares issued and outstanding Common Stock, Value, Issued Premiums earned Premiums earned Premiums Earned, Net COMMITMENTS AND CONTINGENCIES Commitments and Contingencies Disclosure [Text Block] Bermuda Re Citibank LOC Facility Four Bermuda Re Citibank Letter of Credit Facility Four [Member] Bermuda Re Citibank Letter of Credit Facility Four [Member] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Denominator for diluted earnings per adjusted weighted-average common shares (in shares) Weighted Average Number of Shares Outstanding, Diluted Schedule of Components of Net Realized Capital Gains (Losses) Realized Gain (Loss) on Investments [Table Text Block] Commitments and contingencies (Note 11) Commitments and Contingencies Number of reportable segments that sell products Number Of Reportable Segments That Sell Products Number Of Reportable Segments That Sell Products Schedule of Premiums and Losses Ceded Schedule Of Premiums And Losses Ceded By Company To Affiliate [Table Text Block] Schedule Of Premiums And Losses Ceded By The Company To Affiliate Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Net income (loss) available to common stockholders, basic before dividends, common stock Net Income (Loss) Available to Common Stockholders, Basic Before Dividends, Common Stock Net Income (Loss) Available to Common Stockholders, Basic Before Dividends, Common Stock Entity Small Business Entity Small Business Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Bermuda Re Citibank LOC Facility Two Bermuda Re Citibank Letter of Credit Facility Two [Member] Bermuda Re Citibank Letter of Credit Facility Two [Member] Investments, Debt Securities Benchmark Investments, Debt Securities Benchmark [Member] Investments, Debt Securities Benchmark Bermuda Re Nordea Bank Letter of Credit Facility Total Nordea Bank ABP, NY LOC Facility Bermuda Re Nordea Bank Letter Of Credit Facility [Member] Bermuda Re Nordea Bank Letter Of Credit Facility Preferred stock, shares outstanding (in shares) Preferred Stock, Shares Outstanding LONG-TERM SUBORDINATED NOTES Long-Term Debt [Text Block] Document Transition Report Document Transition Report Due after one year through five years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five Short-term investments Short-term investments and cash Short-term investments Short-Term Investments [Member] Underlying Securities Award Underlying Securities Amount Gross gains from sales Debt Securities, Available-for-Sale, Realized Gain Policyholder benefits and claims incurred, ceded Policyholder Benefits and Claims Incurred, Ceded Equity Component [Domain] Equity Component [Domain] Kristin Storms Kristin Storms [Member] Kristin Storms Document Period End Date Document Period End Date PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Due after ten years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 Schedule of Roll Forward of Allowance for Credit Losses of Fixed Maturities, Held to Maturity Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Table Text Block] Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items] Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items] INCOME TAXES Income Tax Disclosure [Text Block] Bermuda Re Barclays Credit Facility One Bermuda Re Barclays Credit Facility One [Member] Bermuda Re Barclays Credit Facility One Uncommitted amount available Line of Credit Facility, Maximum Uncommitted Amount Available Line of Credit Facility, Maximum Uncommitted Amount Available Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Table] Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Table] Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] 3.125% Senior notes Senior Notes 3.125 [Member] Senior Notes 3.125 [Member] Global Wholesale & Specialty Global Wholesale & Specialty Segment [Member] Insurance [Member] Fair Value Debt Instrument, Fair Value Disclosure Decreases in allowance on previously impaired securities Debt Securities, Available-For-Sale, Excluding Accrued Interest, Allowance For Credit Loss, Not To Sell Before Recovery, Credit Loss, Previously Recorded, Reversal Debt Securities, Available-For-Sale, Excluding Accrued Interest, Allowance For Credit Loss, Not To Sell Before Recovery, Credit Loss, Previously Recorded, Reversal Increases in allowance on previously impaired securities Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Not To Sell Before Recovery, Credit Loss, Previously Recorded, Expense Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Not To Sell Before Recovery, Credit Loss, Previously Recorded, Expense Amortization of bond premium (accrual of bond discount) Amortization of Debt Discount (Premium) Document Type Document Type Significant Unobservable Inputs (Level 3) Fair Value, Inputs, Level 3 [Member] Fair Value Debt Securities, Available-for-Sale, Unrealized Loss Position [Abstract] EARNINGS PER COMMON SHARE Earnings Per Share [Text Block] RESERVE FOR LOSSES AND LAE Liability for Future Policy Benefits and Unpaid Claims Disclosure [Text Block] Name Outstanding Recovery, Individual Name Additional paid-in capital Additional Paid in Capital Decrease (increase) in funds held by reinsureds, net Increase (Decrease) in Funds Held under Reinsurance Agreements Non-agency residential Residential Mortgage Backed Securities Issued By Private Enterprises [Member] Residential Mortgage Backed Securities Issued By Private Enterprises Reinsurer, Name [Domain] Reinsurer, Name [Domain] Federal Home Loan Bank Branch [Axis] Federal Home Loan Bank Branch [Axis] Transfer in and/or (out) of Level 3 Transfers in/(out) of Level 3 and reclassification of securities in/(out) of investment categories Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net Gross losses from sales Debt Securities, Available-for-Sale, Realized Loss Due after ten years Debt Securities, Held-to-Maturity, Amortized Cost Excluding Accrued Interest, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 10 All Individuals All Individuals [Member] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Issuer One Issuer One [Member] Issuer One Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Name Forgone Recovery, Individual Name Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items] Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items] Statistical Measurement [Axis] Statistical Measurement [Axis] Credit losses on securities where credit losses were not previously recorded Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Not Previously Recorded Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Not Previously Recorded 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] Number of securities held as primary beneficiary Number of Securities Held as Primary Beneficiary Number of Securities Held as Primary Beneficiary Reclassification From Accumulated Other Comprehensive Income Reclassification out of Accumulated Other Comprehensive Income [Member] Winter Storm Fern Winter Storm Fern [Member] Winter Storm Fern Disposal Group Classification [Axis] Disposal Group Classification [Axis] Denominator for basic earnings per weighted-average common shares (in shares) Weighted Average Number of Shares Issued, Basic Southern California wildfires Southern California wildfires [Member] Southern California wildfires Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Disposal Group Name [Axis] Disposal Group Name [Axis] Cost of shares withheld on settlements of share-based compensation awards Payment, Tax Withholding, Share-Based Payment Arrangement Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Other liabilities Disposal Group, Including Discontinued Operation, Other Liabilities Short-term investments Other Short-Term Investments Numerator for basic earnings per common share Net Income (Loss) Available to Common Stockholders, Basic Middle East Conflict Middle East Conflict [Member] Middle East Conflict Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Schedule of Underwriting Results for Segments Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block] Total other comprehensive income (loss), net of tax Net increase (decrease) during the period Current period change Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Proceeds from fixed maturities sold - held to maturity Proceeds from sales of fixed maturity securities - held to maturity Proceeds from Sale of Held-to-Maturity Securities Geographical [Axis] Geographical [Axis] Accumulated other comprehensive income (loss), net deferred income tax expense (benefit) AOCI Tax, Attributable to Parent Bermuda Re Citibank LOC Facility Fourteen Bermuda Re Citibank Letter of Credit Facility Fourteen [Member] Bermuda Re Citibank Letter of Credit Facility Fourteen Change in other assets and liabilities, net Increase (Decrease) in Other Operating Assets and Liabilities, Net Losses in course of payment Loss In Course Of Payment Loss In Course Of Payment Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Add: dividends declared - common shareholders Dividends, Common Stock, Declared Dividends, Common Stock, Declared Total benefit plan net gain (loss) for the period Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent Agency commercial Commercial Mortgage-Backed Security, Issued By US Government-Sponsored Enterprise [Member] Commercial Mortgage-Backed Security, Issued By US Government-Sponsored Enterprise In Use Long-Term Line of Credit Quoted Prices in Active Markets for Identical Assets (Level 1) Fair Value, Inputs, Level 1 [Member] Total net realized gains (losses) from dispositions Total net realized gains (losses) from dispositions Gain (Loss) on Disposition of Assets Diluted (in dollars per share) Earnings Per Share, Diluted Increase (decrease) in losses in course of payment Increase Decrease In Losses In Course Of Payment Increase Decrease In Losses In Course Of Payment Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Axis] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Title of 12(b) Security Title of 12(b) Security Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Roll Forward] Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Roll Forward] NON-CASH TRANSACTIONS: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Due after five years through ten years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Commerzbank Letter of Credit Facility Total Commerzbank Letter of Credit Facility Everest Reinsurance Company (Ireland), Dac Commerzbank Letter Of Credit Facility [Member] Everest Reinsurance Company (Ireland), Dac Commerzbank Letter Of Credit Facility Schedule of Proceeds and Split Between Gross Gains and Losses, from Dispositions of Fixed Maturity Securities Schedule of Realized Gain (Loss) [Table Text Block] AOCI Attributable to Parent, Net of Tax [Roll Forward] AOCI Attributable to Parent, Net of Tax [Roll Forward] Net of Tax Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Bermuda Re Lloyd's Bank Credit Facility - Committed Bermuda Re Lloyd’s Bank Letter of Credit Facility - Committed [Member] Bermuda Re Lloyd’s Bank Letter of Credit Facility - Committed [Member] Treasury shares (in shares) Treasury Stock, Common, Shares EARNINGS PER COMMON SHARE: Earnings Per Share [Abstract] Paid related to: Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract] Distributions from other invested assets Proceeds from Equity Method Investment, Distribution, Return of Capital Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Variable Interest Entity, Not Primary Beneficiary Variable Interest Entity, Not Primary Beneficiary [Member] Reinsurance Contract [Axis] Reinsurance Contract [Axis] Reinsurer, Name [Axis] Reinsurer, Name [Axis] Schedule of Interest Expense Incurred in Connection with Senior Notes Interest Income and Interest Expense Disclosure [Table Text Block] Less reinsurance recoverables on unpaid losses Plus reinsurance recoverables on unpaid losses Reinsurance Recoverables, Including Reinsurance Premium Paid Decreases in allowance on previously impaired securities Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Not To Sell Before Recovery, Credit Loss, Previously Recorded, Reversal Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Not To Sell Before Recovery, Credit Loss, Previously Recorded, Reversal Cash surrender value of life insurance Cash Surrender Value of Life Insurance Proceeds from equity securities sold Proceeds from sales of equity securities Proceeds from Sale of Equity Securities, FV-NI State National Reinsurer State National Reinsurer [Member] State National Reinsurer Foreign corporate securities Debt Security, Corporate, Non-US [Member] Effect of dilutive securities: Weighted Average Number of Shares Outstanding, Diluted, Adjustment [Abstract] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Income taxes paid (recovered) Income Taxes Paid, Net Treasury shares acquired (in shares) Treasury Stock, Shares, Acquired Award Timing Disclosures [Line Items] Bermuda Re Bayerische Landesbank Bilateral Secured Credit Facility Bermuda Re Bayerische Landesbank Bilateral Secured Credit Facility - Committed Bermuda Re Bayerische Landesbank Bilateral Secured Credit Facility [Member] Bermuda Re Bayerische Landesbank Bilateral Secured Credit Facility [Member] Ceded earned premiums Ceded Earned Premiums Ceded Earned Premiums Unrealized appreciation (depreciation) ("URA(D)") of securities arising during the period OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax Due in one year or less Due In One Year Or Less [Member] Due In One Year Or Less [Member] Due in one year through five years Due In One Year Through Five Years [Member] Due in One Year Through Five Years [Member] NET INCOME (LOSS) Net income (loss) Net income (loss) Net Income (Loss) Attributable to Parent Net change in unsettled securities transactions Net Change In Unsettled Securities Transactions Net Change In Unsettled Securities Transactions Schedule of Aggregate Fair Value and Gross Unrealized Depreciation of Fixed Maturity Securities by Security Type Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block] Expiration Date Trading Arrangement Expiration Date Bermuda Re Citibank LOC Facility Six Bermuda Re Citibank Letter of Credit Facility Six [Member] Bermuda Re Citibank Letter of Credit Facility Six Percentage of voting common shares owned by group (in percent) Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage Reinsurance Treaty Reinsurance Treaty Segment [Member] Reinsurance [Member] Unsettled securities payable Other Payable to Broker-Dealer and Clearing Organization Reinsurance paid loss recoverables, net of credit allowances Reinsurance Recoverables on Paid Losses, Allowance Other assets, net of credit allowances Other Assets, Allowance for Credit Loss Other Assets, Allowance for Credit Loss Foreign government securities Debt Security, Government, Non-US [Member] Fixed maturities - held to maturity, at amortized cost, net of credit allowances Allowance for Credit Losses Beginning balance Balance, end of period Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest Held to maturity, carrying amount, net Debt Securities, Held-to-Maturity, Sale Total URA(D) of securities arising during the period Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, Net of Tax, Portion Attributable to Parent Investments Investments [Member] Bermuda Re Citibank LOC Facility Twelve Bermuda Re Citibank Letter of Credit Facility Twelve [Member] Bermuda Re Citibank Letter of Credit Facility Twelve Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Increases in allowance on previously impaired securities Debt Securities, Available-For-Sale, Excluding Accrued Interest, Allowance for Credit Loss, Not To Sell Before Recovery, Credit Loss, Previously Recorded, Expense Debt Securities, Available-For-Sale, Excluding Accrued Interest, Allowance for Credit Loss, Not To Sell Before Recovery, Credit Loss, Previously Recorded, Expense Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Ceded written premiums Limit Ceded Premiums Written Purchase of treasury shares Payments for Repurchase of Common Stock Adoption Date Trading Arrangement Adoption Date Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Securities on deposit with or regulated by government authorities Deposits with Clearing Organizations and Others, Securities Cash received from shares issued in period Proceeds, Issuance of Shares, Share-Based Payment Arrangement, Excluding Option Exercised Additional contractual commitments Additional contractual commitments Additional contractual commitments Entity Current Reporting Status Entity Current Reporting Status Corporate expenses Corporate expenses Corporate Expenses Corporate expenses Customer [Axis] Customer [Axis] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Issuer [Axis] Issuer [Axis] Issuer Consolidated Entities [Domain] Consolidated Entities [Domain] Due in one year or less Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One Retained earnings Retained Earnings (Accumulated Deficit) Financial Instrument [Axis] Financial Instrument [Axis] 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] Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation Greater than 12 months Greater than 12 months Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Per common share net income (loss) Earnings Per Share, Basic and Diluted EPS [Abstract] Earnings Per Share, Basic and Diluted EPS Other income (expense) Other income (expense) Other Operating Income (Expense), Net Bermuda Re Citibank LOC Facility - Uncommitted Facility Two Bermuda Re Citibank LOC Facility - Uncommitted Facility Two [Member] Bermuda Re Citibank LOC Facility - Uncommitted Facility Two Cost of fixed maturities acquired - held to maturity Payments to Acquire Held-to-Maturity Securities Prior years, impact from retroactive reinsurance Prior Year Claims and Claims Adjustment Expense, Impact From Retroactive Reinsurance And Claims Adjustment Expense, Incurred Claims Prior Year Claims and Claims Adjustment Expense, Impact From Retroactive Reinsurance And Claims Adjustment Expense, Incurred Claims Current Fiscal Year End Date Current Fiscal Year End Date American International Group, Inc. American International Group, Inc. [Member] American International Group, Inc. Subsequent Event Type [Domain] Subsequent Event Type [Domain] Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation Less than 12 months Less than 12 months Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Bermuda Re Citibank LOC Facility Eleven Bermuda Re Citibank Letter of Credit Facility Eleven [Member] Bermuda Re Citibank Letter of Credit Facility Eleven 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] Increase (decrease) in amounts due to reinsurers Increase (Decrease) in Reinsurance Payables Prior years Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years Statement [Table] Statement [Table] COLLATERALIZED REINSURANCE, TRUST AGREEMENTS AND OTHER RESTRICTED ASSETS Restricted Assets Disclosure [Text Block] Adjustments to reconcile net income to net cash provided by operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] CASH FLOWS FROM FINANCING ACTIVITIES: Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Reclassification out of Accumulated Other Comprehensive Income [Domain] Reclassification out of Accumulated Other Comprehensive Income [Domain] Limited partnerships Limited Partnerships [Member] Limited Partnerships [Member] Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] United States, United Kingdom, And Asia Pacific United States, United Kingdom, And Asia Pacific [Member] United States, United Kingdom, And Asia Pacific Bermuda Re Wells Fargo Bank Bilateral LOC Facility - secured tranche Bermuda Re Wells Fargo Bank Bilateral Letter of Credit Facility Secured Tranche [Member] Bermuda Re Wells Fargo Bank Bilateral Letter of Credit Facility Secured Tranche Higher Premiums Earned Higher Premiums Earned [Member] Higher Premiums Earned Gross unrealized losses on investments in unrealized loss position Total Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost, Fiscal Year Maturity [Abstract] Equity securities, at fair value Equity securities, fair value Equity Securities, FV-NI, Current Schedule of Activity Under Level 3, Fair Value Measurements Using Significant Unobservable Inputs by Asset Type Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] All Adjustments to Compensation All Adjustments to Compensation [Member] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Fair Value Debt Securities, Held-to-Maturity, Maturity, Allocated and Single Maturity Date, Fair Value Amendment Flag Amendment Flag Fair Value Debt Securities, Available-for-Sale, Fair Value, Fiscal Year Maturity [Abstract] Shares authorized (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized No Recorded Allowance for Credit Losses No Recorded Allowance for Credit Losses [Member] No Recorded Allowance for Credit Losses [Member] Reserve for losses and loss adjustment expenses Gross reserves beginning of period Gross reserves end of period Liability for Claims and Claims Adjustment Expense Treasury shares, at cost; 34.7 shares (2026) and 33.7 shares (2025) Treasury Stock, Common, Value Termination Date Trading Arrangement Termination Date Net cash provided by (used in) financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Investment Grade External Credit Rating, Investment Grade [Member] Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Measure: Measure [Axis] Accrued investment income Disposal Group, Including Discontinued Operation, Accrued Investment Income Disposal Group, Including Discontinued Operation, Accrued Investment Income Due in one year or less Debt Securities, Held-to-Maturity, Amortized Cost Excluding Accrued Interest, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, Year One Extension period for availability Line of Credit Facility, Term, Period Of Extension Line of Credit Facility, Term, Period Of Extension Bermuda Re Barclays Credit Facility Total Bermuda Re Barclays Bilateral Letter of Credit Facility Bermuda Re Barclays Credit Facility [Member] Bermuda Re Barclays Credit Facility Tax Effect Reclassification from AOCI, Current Period, Tax [Abstract] Payments for reinsurance Payments for Reinsurance Due after ten years Due After Ten Years [Member] Due After Ten Years [Member] Basic weighted-average common shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Net reserves beginning of period Net reserves end of period Reserve For Losses And Loss Adjustment Expenses Net Reserve For Losses And Loss Adjustment Expenses Net Disposal Group Classification [Domain] Disposal Group Classification [Domain] Schedule of Net Income (Loss) per Common Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Myanmar Earthquake Myanmar Earthquake [Member] Myanmar Earthquake Schedule of Amount Reclassified from Accumulated Other Comprehensive Income Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] Subsequent Events [Abstract] Subsequent Events [Abstract] Segment Reporting [Abstract] Segment Reporting [Abstract] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Washington D.C. Aviation Incident Washington D.C. Aviation Incident [Member] Washington D.C. Aviation Incident Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Investment expenses Investment Income, Investment Expense Entity Tax Identification Number Entity Tax Identification Number Reclassification from AOCI Reclassification from AOCI, Current Period, Tax Issuer Two Issuer Two [Member] Issuer Two Reclassification from AOCI Reclassification from AOCI, Current Period, before Tax, Attributable to Parent Securities where an allowance for credit loss was recorded Recorded an Allowance for Credit Losses [Member] Recorded an Allowance for Credit Losses [Member] Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Consolidated Entities [Axis] Consolidated Entities [Axis] Common stock, par value per share (in dollars per share) Common Stock, Par or Stated Value Per Share Common shares, issued (in shares) Common Stock, Shares, Issued Mortgage-backed securities, Commercial Commercial Mortgage-Backed Securities [Member] Future policy benefit reserve income (expense) Future Policy Benefit Reserve Income Expense Future Policy Benefit Reserve Income Expense Reduction in allowance due to disposals Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss, Sold Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] Use of Estimates Use of Estimates, Policy [Policy Text Block] Total other comprehensive income (loss) Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent Trading Arrangement: Trading Arrangement [Axis] Total Shareholder Return Amount Total Shareholder Return Amount Funds held interest income (expense) Funds Held Interest Income Expense Funds Held Interest Income Expense SUBSEQUENT EVENTS Subsequent Events [Text Block] Insider Trading Arrangements [Line Items] Security Exchange Name Security Exchange Name Bermuda Re Citibank LOC Facility Eight Bermuda Re Citibank Letter of Credit Facility Eight [Member] Bermuda Re Citibank Letter of Credit Facility Eight [Member] Decrease (increase) in reinsurance recoverables Increase (Decrease) in Reinsurance Recoverable Gross investment income Investment Income, Interest and Dividend Equity securities Equity Securities [Member] Fixed maturities, credit allowances Allowance for Credit Losses Beginning balance Balance, end of period Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest Total liabilities Liabilities Mortgage-backed securities Collateralized Mortgage-Backed Securities [Member] Line of credit facility, commitment Commitment Line of Credit Facility, Maximum Borrowing Capacity Net investment income Investment Income, Net Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] CLAIMS AND EXPENSES: Operating Expenses [Abstract] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Fair Value by Asset Class [Domain] Asset Class [Domain] Included in earnings Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Statement [Line Items] Statement [Line Items] Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] Asset-backed securities Asset-Backed Securities [Member] Bermuda Re Bayerische Landesbank Bilateral Unsecured Letter of Credit Facility Bermuda Re Bayerische Landesbank Bilateral Unsecured Credit Facility - Committed Bermuda Re Bayerische Landesbank Bilateral Unsecured Letter of Credit Facility [Member] Bermuda Re Bayerische Landesbank Bilateral Unsecured Letter of Credit Facility Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Interest expense incurred Interest Expense, Subordinated Notes and Debentures Counterparty Name [Axis] Counterparty Name [Axis] Issued (redeemed) during the period, net (in shares) Stock Issued During Period, Shares, Period Increase (Decrease) Proceeds from fixed maturities matured/called/repaid - held to maturity Proceeds from Maturities, Prepayments and Calls of Held-to-Maturity Securities COMMON SHARES Common Stock [Member] Fixed maturities - held to maturity, at amortized cost (fair value: 2026, $601; 2025, $576, net of credit allowances: 2026, $(8); 2025, $(6)) Debt Securities, Held-to-Maturity, Excluding Accrued Interest, after Allowance for Credit Loss Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Kilimanjaro Re Limited Kilimanjaro Re Limited [Member] Kilimanjaro Re Limited [Member] Non-NEOs Non-NEOs [Member] Bermuda Re Lloyd’s Bank Letter of Credit Facility - Committed Two Bermuda Re Lloyd’s Bank Letter of Credit Facility - Committed Two [Member] Bermuda Re Lloyd’s Bank Letter of Credit Facility - Committed Two Net increase (decrease) in cash including balances classified as held-for-sale Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Catastrophe Losses Catastrophe Losses [Member] Catastrophe Losses