Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Trading Arrangement: Trading Arrangement [Axis] Maximum Maximum [Member] Gross commission income Gross Commission Income [Member] Gross Commission Income Short-Term Debt, Type [Axis] Short-Term Debt, Type [Axis] Adjustment to Compensation, Amount Adjustment to Compensation Amount Segment Reporting [Abstract] Schedule of Estimated Future Amortization Expense for Finite-Lived Intangible Assets Intangible Asset, Finite-Lived, and Capitalized Cost, Software to be Sold, Leased, or Marketed, Estimated Amortization Expense [Table Text Block] Accrued payroll and related employee costs Employee-related Liabilities, Current Trademarks Trademarks [Member] Leases Lessee, Finance Leases [Text Block] Anywhere merger transaction and integration expenses Total Anywhere merger transaction and integration expenses Anywhere merger transaction and integration costs Business Combination, Integration-Related Cost, Expense 2027 Finance Lease, Liability, to be Paid, Year One Franchise agreements Franchise Rights [Member] Initial conversion price (in dollars per share) Debt Instrument, Convertible, Conversion Price Common stock, voting rights Common Stock, Voting Rights, Number Of Votes Per Share Common Stock, Voting Rights, Number Of Votes Per Share Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Integration-related costs Integration Related Costs Integration Related Costs Issuance of the Put Right liability Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Issuances Developed technology Developed Technology Rights [Member] Property and equipment Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment 7.00% Senior Secured Second Lien Notes 7.00% Senior Secured Second Lien Notes [Member] 7.00% Senior Secured Second Lien Notes Leases [Abstract] Other comprehensive income, net of tax: Other Comprehensive Income (Loss), Net of Tax [Abstract] Voting rights, percentage Percentage Of Voting Rights Eligible For Consolidation Percentage of voting rights eligible for consolidation. 9.75% Senior Secured Second Lien Notes 9.75% Senior Secured Second Lien Notes [Member] 9.75% Senior Secured Second Lien Notes Common stock, par value (in dollars per share) Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Intangible assets, net Net Value Intangible Asset, Excluding Goodwill, after Accumulated Amortization Beginning balance (in shares) Ending balance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount 2029 Lessee, Liability, Payments, Due Year Three Lessee, Liability, Payments, Due Year Three Number of reportable segments Number of Reportable Segments Total current liabilities Liabilities, Current Customer relationships - Relocation Customer relationships Customer Relationships [Member] Short-Term Debt, Type [Domain] Short-Term Debt, Type [Domain] Entity Address, City or Town Entity Address, City or Town Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Judicial Ruling Judicial Ruling [Member] Thereafter Other Commitment, to be Paid, After Year Three Other Commitment, to be Paid, After Year Three Net Value Intangible Asset, Finite-Lived, after Accumulated Amortization Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Cash And Money Market Funds Cash And Money Market Funds [Member] Cash and money market funds. Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Other comprehensive loss, net of tax Other Comprehensive Income (Loss), Net of Tax Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Commissions payable Increase (Decrease) In Commission Payable Increase (Decrease) In Commission Payable December 31, 2028 December 31, 2028 [Member] December 31, 2028 Reclassification Revision of Prior Period, Reclassification, Adjustment [Member] Use of Estimates Use of Estimates, Policy [Policy Text Block] Schedule of Changes in the Fair Value of Level 3 Financial Liabilities Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Repayments of drawdowns on Revolving Credit Facility Repayments of Lines of Credit Batton, et al. v. Compass, Inc. Batton, et al. v. Compass, Inc. [Member] Batton, et al. v. Compass, Inc. Schedule of Operating Lease Liability Maturity Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Supplemental non-cash information: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Document Period End Date Document Period End Date Preferred stock shares outstanding (in shares) Preferred Stock, Shares Outstanding Aggregate principal amount Debt Instrument, Face Amount 2028 Lessee, Operating Lease, Liability, to be Paid, Year Two Long-term debt Business Combination, Recognized Liability Assumed, Long-Term Debt, Noncurrent Net income used in computing diluted net income per share of common stock Net Income (Loss) Attributable to Parent, Diluted Event [Domain] Event [Domain] Event. Replacement awards assumed in connection with the Anywhere Merger (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Replacement Awards Assumed in Period Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Assumed in Period Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] Weighted average remaining lease term (in years), Finance leases Finance Lease, Weighted Average Remaining Lease Term Common Class B Class B common stock Common Class B [Member] Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Shell Company Entity Shell Company Consolidation Items [Domain] Consolidation Items [Domain] Changes in fair value included in net income (loss) Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings Operating lease liabilities Operating Lease, Liability, Current Renewal fee, payment period (in years) Line of Credit Facility, Renewal Term Line of Credit Facility, Renewal Term Net Income (Loss) Per Share Attributable to Compass, Inc. 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Notes 5.75% Senior Notes [Member] 5.75% Senior Notes Conversion ratio Debt Instrument, Convertible, Conversion Ratio Weighted-average effect of diluted securities (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Commissions payable Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Commissions Payable, Current Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Commissions Payable, Current Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Estimated Fair Value Long-Term Debt, Fair Value Plan Name [Domain] Plan Name [Domain] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Scenario [Domain] Scenario [Domain] Beginning balance (in dollars per share) Ending balance (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise 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Combination, Pro Forma Information, Pro Forma Income (Loss), after Tax Unrecognized stock-based compensation expense Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Option Indexed to Issuer's Equity, Type [Axis] Option Indexed to Issuer's Equity, Type [Axis] Relocation receivables Increase (Decrease) In Relocation Receivables Increase (Decrease) In Relocation Receivables Segments [Domain] Segments [Domain] Debt Debt Disclosure [Text Block] Scenario [Axis] Scenario [Axis] Schedule of Total Costs Incurred in Connection With Restructuring Activities Restructuring and Related Costs [Table Text Block] Business Combination [Table] Business Combination [Table] Acquisitions Mergers, Acquisitions and Dispositions Disclosures [Text Block] PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Less: imputed interest Lease, Liability, Undiscounted Excess Amount Lease, Liability, Undiscounted Excess Amount Secured Debt Secured Debt [Member] Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract] Purchase of capped call for convertible notes Adjustments To Additional Paid In Capital, Capped Call Purchase Adjustments To Additional Paid In Capital, Capped Call Purchase Weighted average discount rate, Finance lease Finance Lease, Weighted Average Discount Rate, Percent Debt instrument, interest rate Debt Instrument, Interest Rate, Stated Percentage Total Compass, Inc. stockholders’ equity Equity, Attributable to Parent Anywhere Plan Anywhere Plan [Member] Anywhere Plan 2028 Other Commitment, to be Paid, Year Two Other non-current assets Business Combination, Recognized Asset Acquired, Other Asset, Noncurrent Assets Assets [Abstract] Franchise Franchise Franchise Segment [Member] Franchise Segment Equity interest issued or issuable (in shares) Business Combination, Consideration Transferred, Equity Interest, Share Issued, Number of Shares Insider Trading Policies and Procedures [Line Items] Measurement period adjustments Goodwill, Measurement Period Adjustment Accounts receivable, net of allowance Accounts Receivable, Allowance for Credit Loss, Current Changes In Contingent Consideration Measured At Fair Value On A Recurring Basis [Roll Forward] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Deferred income taxes Deferred Income Tax Expense (Benefit) Accrued severance cost, liability Accrued Severance Cost, Liability Accrued Severance Cost, Liability Anywhere merger transaction and integration expenses Share-Based Payment Arrangement, Expense, Merger And Integration Costs Share-Based Payment Arrangement, Expense, Merger And Integration Costs Purchase of capped call for convertible notes Payments for Derivative Instrument, Financing Activities Antidilutive securities excluded from computation of earnings per share (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Number of operating segments Number of Operating Segments Schedule of Changes In The Carrying Amount Of Goodwill Goodwill [Table Text Block] Supplemental Lease Balance Sheet Information Assets And Liabilities, Lessee [Table Text Block] Assets And Liabilities, Lessee Entity Central Index Key Entity Central Index Key Additional paid-in capital Additional Paid in Capital, Common Stock 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] Total restructuring costs Restructuring and Related Cost, Incurred Cost Credit Facility Utilization [Axis] Credit Facility Utilization [Axis] Credit facility utilization. Payments for legal settlements Payments for Legal Settlements Remaining 2026 Long-Term Debt, Maturity, Remainder of Fiscal Year Other Stockholders' Equity, Other Ownership [Axis] Ownership [Axis] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Investment, Name [Axis] Investment, Name [Axis] Finance lease liabilities Finance Lease, Liability, Noncurrent Number of Options Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward] Basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate Other current assets Business Combination, Recognized Asset Acquired, Other Asset, Current Variable Rate [Domain] Variable Rate [Domain] Total future lease payments Finance Lease, Liability, to be Paid Accumulated Other Comprehensive Loss AOCI Attributable to Parent [Member] All Individuals All Individuals [Member] Purchase of capped call for convertible notes Payments For Purchase Of Capped Call For Convertible Notes Payments For Purchase Of Capped Call For Convertible Notes Unrecognized stock-based compensation expense, weighted-average period of recognition (in years) Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Share consideration Business Combination, Consideration Transferred, Equity Interest Statement [Line Items] Statement [Line Items] Total assets Assets Operating Leases Lessee, Operating Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract] Convertible Debt Convertible Debt [Member] Relocation receivables Relocation Receivables Relocation Receivables Operating Segments Operating Segments [Member] Schedule of Total Stock-Based Compensation Expense Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Total liabilities Business Combination, Recognized Liability Assumed, Liability Stock-Based Compensation Share-Based Payment Arrangement [Text Block] PEO PEO [Member] Escrow and trust deposits Noninterest-Bearing Deposit Liabilities 2028 Long-Term Debt, Maturity, Year Two Other non-current liabilities Other Liabilities, Noncurrent Goodwill Goodwill Reallocation of goodwill at the Reorganization Date Balance at June 30, 2026 Goodwill Retirement Plan Type [Axis] Retirement Plan Type [Axis] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Increase in borrowing capacity Line Of Credit Facility, Increase In Borrowing Capacity Line Of Credit Facility, Increase In Borrowing Capacity Severance-related personnel costs Expected Severance Costs Remaining In Current Year Expected Severance Costs Remaining In Current Year Accounts payable Business Combination, Recognized Liability Assumed, Accounts Payable, Current Operating lease liabilities Operating Lease, Liability, Noncurrent Accumulated Deficit Retained Earnings [Member] Total operating expenses Operating Expenses Revolving Credit Facility Revolving Credit Facility [Member] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Common stock, shares outstanding (in shares) Beginning balance (in shares) Ending balance (in shares) Shares outstanding (in shares) Common Stock, Shares, Outstanding Award Timing Disclosures [Line Items] Schedule of Level 2 Financial Instruments Fair Value, by Balance Sheet Grouping [Table Text Block] Anywhere Merger consideration and replacement awards Adjustments To Additional Paid In Capital, Acquisition Consideration And Replacement Equity Awards Issued, Value Adjustments To Additional Paid In Capital, Acquisition Consideration And Replacement Equity Awards Issued, Value Net income (loss) per share attributable to Compass, Inc., diluted (in dollars per share) Earnings Per Share, Diluted Litigation Case [Domain] Litigation Case [Domain] Amortization of intangible assets Intangible Asset, Finite-Lived, Amortization Expense Interest expense on the 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Purchase Plan. Service revenue Service [Member] Schedule of Finance Lease Liability Maturity Finance Lease, Liability, to be Paid, Maturity [Table Text Block] Remaining 2026 Finance Lease, Liability, to be Paid, Remainder of Fiscal Year Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Parent Owner Of Certain Franchisees Under Sotheby's And Century 21 Brands [Member] Owner Of Certain Franchisees Under Sotheby's And Century 21 Brands Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Common stock, shares issued (in shares) Shares issued (in shares) Common Stock, Shares, Issued Accounts receivable Increase (Decrease) in Accounts Receivable Product and Service [Domain] Product and Service [Domain] Class of Stock [Line Items] Class of Stock [Line Items] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Deferred income taxes Deferred Income Tax Liabilities, Net Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Operating lease right-of-use assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Operating Lease, Right-of-Use Asset Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Operating Lease, Right-of-Use Asset Program fee, percentage Debt Instrument, Variable Rate, Program Fee, Percentage Debt Instrument, Variable Rate, Program Fee, Percentage Non-current lease liabilities Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Lease Obligation, Noncurrent Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Lease Obligation, Noncurrent 2029 Lessee, Operating Lease, Liability, to be Paid, Year Three Termination Date Trading Arrangement Termination Date Other Commitments [Axis] Other Commitments [Axis] Finite-lived intangible assets Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Finite-Lived Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Issuance of common stock upon settlement of RSUs, net of taxes withheld Restricted Stock, Value, Shares Issued Net of Tax Withholdings Other Other Liabilities, Current Accrued expenses and other current liabilities Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Accrued Liabilities And Current Liabilities, Other Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Accrued Liabilities And Current Liabilities, Other Fair Value as of Grant Date Award Grant Date Fair Value Deferred Revenue Arrangement [Line Items] Deferred Revenue Arrangement [Line Items] Debt instrument, redemption price, percentage Debt Instrument, Redemption Price, Percentage Goodwill [Table] Goodwill [Table] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Arrangement Duration Trading Arrangement Duration Thereafter Lessee, Liability, Payments, Due after Year Four Lessee, Liability, Payments, Due after Year Four Consolidation Items [Axis] Consolidation Items [Axis] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Other (in shares) Stockholders' Equity, Other Shares Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Gross Carrying Amount Intangible Asset, Finite-Lived, before Accumulated Amortization Revenue Revenues Equity in income of unconsolidated entities Equity in income of unconsolidated entities Equity in income of unconsolidated entities Income (Loss) from Equity Method Investments Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Finance lease expense Finance Lease, Right-of-Use Asset, 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Value, Inputs, Level 3 [Member] Lease termination costs Lease Termination Costs [Member] Lease Termination Costs Sales and marketing Sales and marketing Other Selling and Marketing Expense 2027 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year One Closing stock price (in dollars per share) Share Price Ownership percentage Subsidiary, Ownership Percentage, Noncontrolling Owner Additional paid in capital, replacement equity awards issued Adjustments To Additional Paid In Capital, Replacement Equity Awards Issued, Value Adjustments To Additional Paid In Capital, Replacement Equity Awards Issued, Value Replacement awards assumed in connection with the Anywhere Merger (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Assumed in Period Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Assumed in Period Interest expense, debt Interest Expense, Debt Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Equity Method Investments Equity Method Investments [Policy Text Block] Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Schedule of Finite-Lived Intangible Assets [Table] Intangible Asset, Finite-Lived [Table] SOFR Term Rate Secured Overnight Financing Rate (SOFR) Term Rate [Member] Secured Overnight Financing Rate (SOFR) Term Rate Title plants Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Indefinite-Lived Non-NEOs Non-NEOs [Member] Equity method investment, ownership percentage Equity Method Investment, Ownership Percentage 2028 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Two Schedule of Debt Schedule of Debt [Table Text Block] Investment, Name [Domain] Investment, Name [Domain] Leases Lessee, Operating Leases [Text Block] 2027 Long-Term Debt, Maturity, Year One Long-Term Debt, Type [Domain] Long-Term Debt, Type [Domain] Statistical Measurement [Axis] Statistical Measurement [Axis] Benefit obligation Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation Award Type [Axis] Award Type [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Operating lease right-of-use assets and operating lease liabilities Increase (Decrease) In Operating Lease Right Of Use Assets, Net Of Operating Lease Liabilities Increase (Decrease) In Operating Lease Right Of Use Assets, Net Of Operating Lease Liabilities Accumulated deficit Retained Earnings (Accumulated Deficit) Restructuring and Related Activities [Abstract] Restructuring and Related Activities [Abstract] Product and Service [Axis] Product and Service [Axis] Change in acquisition-related contingent consideration Business Combination, Contingent Consideration, Change in Contingent Consideration, Liability, Increase (Decrease) Shares issued for Christie's International Real Estate acquisition (in shares) Adjustments To Additional Paid In Capital, Acquisition Consideration Issued, Shares Adjustments To Additional Paid In Capital, Acquisition Consideration Issued, Shares Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Pension Plan Pension Plan [Member] Common Stock Common Stock [Member] Severance related personnel costs Employee Severance [Member] Operating lease costs Operating Lease, Cost Shares issued in period (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period Intangible Asset, Finite-Lived, after Accumulated Amortization, Estimated Amortization Expense, Fiscal Year Maturity [Abstract] Intangible Asset, Finite-Lived, after Accumulated Amortization, Estimated Amortization Expense, Fiscal Year Maturity [Abstract] Non-current lease liabilities Lease Liability, Noncurrent Lease Liability, Noncurrent Total liabilities and stockholders’ equity Liabilities and Equity Variable lease costs Variable Lease, Cost Stock options Outstanding stock options Share-Based Payment Arrangement, Option [Member] Non-controlling interest Equity, Attributable to Noncontrolling Interest Segments [Axis] Segments [Axis] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Asset Class [Axis] Asset Class [Axis] Restructuring costs Restructuring costs Restructuring Charges Securitization obligations Other Secured Financings Tabular List, Table Tabular List [Table Text Block] Capped call price (in dollars per share) Derivative, Capped Call Price Derivative, Capped Call Price Segment Reporting, CODM, Profit (Loss) Measure, How Used, Description Segment Reporting, CODM, Profit (Loss) Measure, How Used, Description 2029 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Three Shares issuable upon conversion of the 0.25% Convertible Senior Notes due 2031 (in shares) Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities Collateralize securitization obligations Relocation Receivables and Other Related Relocation Assets that Collateralize Securitization Obligations Relocation Receivables and Other Related Relocation Assets that Collateralize Securitization Obligations Remaining 2026 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Remainder of Fiscal Year Name Awards Close in Time to MNPI Disclosures, Individual Name Title insurance underwriter joint venture Title Insurance Underwriter Joint Venture [Member] Title Insurance Underwriter Joint Venture 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] Balance, aggregate intrinsic value Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value December 31, 2027 December 31, 2027 [Member] December 31, 2027 Additional share to be issued Business Combination, Consideration Transferred, Equity Interest, Additional Share To Be Issued, Number of Shares Business Combination, Consideration Transferred, Equity Interest, Additional Share To Be Issued, Number of Shares Adjustment to Compensation: Adjustment to Compensation [Axis] Number of votes per share Common Stock, Voting Rights, Number Of Votes For Each Share Common Stock, Voting Rights, Number Of Votes For Each Share Restructuring Cost and Reserve [Line Items] Restructuring Cost and Reserve [Line Items] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Cash paid for interest Interest Paid, Excluding Capitalized Interest, Operating Activity Credit Facility [Axis] Credit Facility [Axis] Restructuring Activities Restructuring and Related Activities Disclosure [Text Block] Gibson Gibson [Member] Gibson Name Measure Name Recognized Deferred Revenue, Revenue Recognized Currency translation adjustment Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Additional Paid-in Capital Additional Paid-in Capital [Member] Intangible Asset, Indefinite-Lived, Class [Axis] Intangible Asset, Indefinite-Lived, Class [Axis] International Franchise Rights International Franchise Rights [Member] International Franchise Rights Name Trading Arrangement, Individual Name Unallocated corporate expenses Unallocated Corporate Expenses Unallocated Corporate Expenses Other Current Assets and Accrued Expenses and Other Current Liabilities Other Current Assets, Accounts Payable, Accrued Liabilities and Other Liabilities Disclosure, Current [Text Block] Other Current Assets, Accounts Payable, Accrued Liabilities and Other Liabilities Disclosure, Current Cash and cash equivalents Cash and Cash Equivalent Company Selected Measure Amount Company Selected Measure Amount Schedule of Segment Reporting, Reconciliation of Profit (Loss) by Segment to Consolidated Segment Reporting, Reconciliation of Profit (Loss) by Segment to Consolidated [Table Text Block] Tuccori v. At World Properties Tuccori v. At World Properties [Member] Tuccori v. 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Weighted Average Exercise Price Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Measure: Measure [Axis] Equity Method Investments Equity Method Investments and Joint Ventures Disclosure [Text Block] Merger, common stock, conversion ratio Merger, Common Stock, Conversion Ratio Merger Agreement, Common Stock, Conversion Ratio Total stock-based compensation expense Share-Based Payment Arrangement, Expense, Including Merger And Integration Costs Share-Based Payment Arrangement, Expense, Including Merger And Integration Costs Equity Components [Axis] Equity Components [Axis] Operations and support Operations and support Other Cost and Expense, Operating Incremental common stock to be issued in connection with the CIRE Share Consideration (in shares) Incremental Common Shares Attributable to Dilutive Effect of Contingently Issuable Shares Common Class A Class A common stock Common Class A [Member] Entity Interactive Data Current Entity Interactive Data Current Variable Rate [Axis] Variable Rate [Axis] Finance lease liabilities Finance Lease, Liability, Current Net income attributable to non-controlling interests Net Income (Loss) Attributable to Noncontrolling Interest Christie's International Real Estate Christie's International Real Estate [Member] Christie's International Real Estate Entity Small Business Entity Small Business Comprehensive income (loss) attributable to Compass, Inc. 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Block] Cover [Abstract] Cover [Abstract] Brokerage equity method investments Brokerage Equity Method Investments [Member] Brokerage Equity Method Investments 2031 and thereafter Long-Term Debt, Maturity, after Year Four Long-Term Debt, Maturity, after Year Four Equity Awards Adjustments Equity Awards Adjustments [Member] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Plan Name [Axis] Plan Name [Axis] Intangible Asset, Finite-Lived, after Accumulated Amortization [Abstract] Intangible Asset, Finite-Lived, after Accumulated Amortization [Abstract] Total Compass, Inc. Stockholders’ Equity Parent [Member] Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period General and administrative General and administrative General and Administrative Expense Schedule of Weighted-average Remaining Lease Term and Discount Rate Schedule Of Operating Lease And Finance Lease Weighted Average Remaining Lease Term And Discount Rate [Table Text Block] Schedule of operating lease weighted average remaining lease term and discount rate. Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration] Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration] Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized 2030 Lessee, Liability, Payments, Due Year Four Lessee, Liability, Payments, Due Year Four 2028 Lessee, Liability, Payments, Due Year Two Lessee, Liability, Payments, Due Year Two Mortgage joint ventures Mortgage Joint Ventures [Member] Mortgage Joint Ventures Class of Stock [Domain] Class of Stock [Domain] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Total Other Commitment Payment plan term (in months) Equity Method Investment, Installment Payment Plan, Period Equity Method Investment, Installment Payment Plan, Period Schedule of Authorized, Issued and Outstanding Shares for Each Classes of Common Stock Schedule of Stock by Class [Table Text Block] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Income Taxes Income Tax Disclosure [Text Block] Accounts payable Accounts Payable, Current Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Cash consideration Business Combination, Consideration Transferred Retirement Plan Type [Domain] Retirement Plan Type [Domain] Entity Filer Category Entity Filer Category Supplemental disclosures of cash flow information: Supplemental Cash Flow Elements [Abstract] Letter of credit sublimit Line of Credit Facility, Maximum Borrowing Capacity Sublimit Line of credit facility maximum borrowing capacity sublimit. Revision of Prior Period [Axis] Revision of Prior Period [Axis] Net change in Securitization obligations Proceeds from (Repayments of) Secured Debt Finance Leases Finance Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract] Prepaid Expense and Other Assets, Current [Abstract] Equity Method Investments and Joint Ventures [Abstract] 2027 Other Commitment, to be Paid, Year One Concierge Facility Used Greater Than Fifty Percent Concierge Facility Used Greater Than Fifty Percent [Member] Concierge facility used greater than fifty percent Entity Address, Address Line Two Entity Address, Address Line Two Schedule of Stock by Class [Table] Stock, Class of Stock [Table] Net income (loss) Net income (loss) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Current lease liabilities Lease Liability, Current Lease Liability, Current Current assets Assets, Current [Abstract] Revenue Business Combination, Pro Forma Information, Pro Forma Revenue Senior Notes Senior Notes [Member] Entity Address, Address Line One Entity Address, Address Line One Operating leases Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Compensation expenses, future services Business Acquisition, Compensation Expense, Future Services Business Acquisition, Compensation Expense, Future Services Vested and converted to common stock (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Income tax (expense) benefit Income tax (expense) benefit Income Tax Expense (Benefit) Consolidation Consolidation, Policy [Policy Text Block] Deferred income taxes Business Combination, Recognized Liability Assumed, Deferred Tax Liability Burnett and Moehrl Burnett and Moehrl [Member] Burnett and Moehrl FDIC insured amount Cash, FDIC Insured Amount Statement [Table] Statement [Table] Accrued expenses Accrued Expenses, Current Accrued Expenses, Current Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table] Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table] Telephone Consumer Protection Act Litigation Telephone Consumer Protection Act Litigation [Member] Telephone Consumer Protection Act Litigation Anywhere Real Estate Inc Anywhere Real Estate Inc. [Member] Anywhere Real Estate Inc. Debt [Table] Debt [Table] Debt [Table] Concierge Facility Used Less Than Fifty Percent Concierge Facility Used Less Than Fifty Percent [Member] Concierge facility used less than fifty percent. Title plants Title Plant Shares [Member] Title Plant Shares Fair value of shares issued for merger consideration Adjustments To Additional Paid In Capital, Acquisition Consideration, Value Adjustments To Additional Paid In Capital, Acquisition Consideration, Value Chief Executive Officer [Member]