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[Member] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Write-offs charged against the allowance, net of recoveries and other Accounts Receivable, Allowance For Credit Loss, Write-Offs, Net Of Recoveries, And Other Accounts Receivable, Allowance For Credit Loss, Write-Offs, Net Of Recoveries, And Other Cash, Cash Equivalents and Restricted Cash Cash and Cash Equivalents, Policy [Policy Text Block] Currency translation adjustments, tax Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax % Effective Income Tax Rate Reconciliation, Percent [Abstract] Total Comcast equity Equity, Attributable to Parent Other comprehensive income, net of tax: Other Comprehensive Income (Loss), Net of Tax [Abstract] Insider Trading Policies and Procedures [Line Items] Common stock, shares authorized (in shares) Common Stock, Shares Authorized Schedule of property and equipment 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Data Current Entity Interactive Data Current Production tax incentive Government Assistance, Income, Increase (Decrease) Less: Valuation allowance Beginning balance Ending balance Deferred Tax Assets, Valuation Allowance Platforms, gift cards Platforms, Gift Cards [Member] Platforms, Gift Cards Revenue Revenue from Contract with Customer [Policy Text Block] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Federal Current Federal Tax Expense (Benefit) Long-Lived Tangible Asset [Axis] Long-Lived Tangible Asset [Axis] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Ten Largest Multichannel Video Provider Customers Ten Largest Multichannel Video Provider Customers [Member] Ten Largest Multichannel Video Provider Customers Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total 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Duration Trading Arrangement Duration Deferred revenue Gift card liability, current Contract with Customer, Liability, Current Percentage of ownership after distribution Sale of Stock, Percentage of Ownership after Transaction Owned: Film, Capitalized Cost [Abstract] Transaction costs Spinoff Transaction, Transaction Costs Incurred Spinoff Transaction, Transaction Costs Incurred Exercise Price Award Exercise Price Entity Filer Category Entity Filer Category Local Phone Number Local Phone Number Class of Stock [Domain] Class of Stock [Domain] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Receivables, gross Accounts Receivable, before Allowance for Credit Loss, Current Federal tax at statutory rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Other Payment for (Proceeds from) Other Investing Activity Subsequent Event Type [Axis] Subsequent Event Type [Axis] Maximum first lien net leverage ratio Debt Instrument, Covenant, 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Loan Facility 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] Entity Address, Address Line One Entity Address, Address Line One Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] Stated interest rate (as a percent) Debt Instrument, Interest Rate, Stated Percentage Less: Allowance for credit losses Beginning balance Ending balance Accounts Receivable, Allowance for Credit Loss, Current Entity Voluntary Filers Entity Voluntary Filers Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Fair Value as of Grant Date Award Grant Date Fair Value Accounts receivable Accounts Receivable, after Allowance for Credit Loss Property, Plant and Equipment 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[Domain] Estimated fair value of equity securities without readily determinable fair values Equity Securities without Readily Determinable Fair Value, Amount Number of operating segments Number of Operating Segments Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Content licensing and other Content Licensing And Other [Member] Content Licensing And Other Machinery, equipment and technology Machinery and Equipment [Member] Related and Nonrelated Parties [Axis] Related and Nonrelated Parties [Axis] Title Trading Arrangement, Individual Title Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Schedule of intangible assets Schedule of Finite-Lived Intangible Assets [Table Text Block] Restatement Determination Date: Restatement Determination Date [Axis] Buildings and leasehold improvements Building And Leasehold Improvements [Member] Building And Leasehold Improvements Non-PEO NEO Non-PEO NEO [Member] Foreign 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programming and production costs Programming And Production Costs Programming And Production Costs Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Breakage revenue Contract with Customer, Liability, Revenue Recognized Schedule of accounts receivable, allowance for credit loss Accounts Receivable, Allowance for Credit Loss [Table Text Block] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Name Awards Close in Time to MNPI Disclosures, Individual Name Increase in deferred tax liability from Federal Legislation Deferred Tax Liability, Increase (Decrease) From Federal Legislation Deferred Tax Liability, Increase (Decrease) From Federal Legislation Audit Information [Abstract] Audit Information Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] ICFR Auditor Attestation Flag ICFR Auditor Attestation Flag Debt Instrument, Redemption, Option Two Debt Instrument, Redemption, Option Two [Member] Debt Instrument, Redemption, Option Two Documents Incorporated by Reference Documents Incorporated by Reference [Text Block] Debt Instrument, Redemption, Option [Domain] Debt Instrument, Redemption, Option [Domain] Debt Instrument, Redemption, Option [Domain] Unrealized impairment loss Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Total deferred tax liabilities Deferred Tax Liabilities, Gross Auditor Firm ID Auditor Firm ID Transactions Transactions [Member] Transactions Foreign Income (Loss) from Continuing Operations before Income Taxes, Foreign Performance Shares Performance Shares [Member] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Cash payment as consideration for contributed assets Spinoff Transaction, Consideration Transferred For Contributed 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Actually Paid Compensation Amount Income Taxes Income Tax Disclosure [Text Block] Class A Common Stock Common Class A [Member] Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Revenue from Contract with Customer [Abstract] Future minimum commitments for licensed content Future Minimum Commitments For Licensed Content Future Minimum Commitments For Licensed Content Total equity Balance, beginning of year Balance, end of year Equity, Including Portion Attributable to Noncontrolling Interest Assets held for sale, goodwill Disposal Group, Including Discontinued Operation, Goodwill In production and in development Film, Monetized In Film Group, Capitalized Cost, In Production And In Development Film, Monetized In Film Group, Capitalized Cost, In Production And In Development Document Type Document Type Name Outstanding Recovery, Individual Name Product and Service [Axis] Product and Service [Axis] Accrued content obligations Program Rights Obligations, Current Revenue from Contract with Customer Benchmark Revenue from Contract with Customer Benchmark [Member] Revenue Revenue from Contract with Customer, Excluding Assessed Tax All Individuals All Individuals [Member] Long-Term Debt, Type [Domain] Long-Term Debt, Type [Domain] Capital expenditures Payments to Acquire Property, Plant, and Equipment Name Forgone Recovery, Individual Name Total current assets Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] 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] Disposal Group Classification [Axis] Disposal Group Classification [Axis] Share repurchase program, amount authorized Share Repurchase Program, Authorized, Amount 2027 Entertainment, License Agreement For Program Material, Including Sports Rights Advances, 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Terminated [Flag] Revolving Credit Facility Agreement Revolving Credit Facility Agreement [Member] Revolving Credit Facility Agreement Content Licensing License and Service [Member] Related Party Transaction [Table] Related Party Transaction [Table] Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Receivables, net Receivables, net Accounts Receivable, after Allowance for Credit Loss, Current Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Title of 12(b) Security Title of 12(b) Security 2026 Entertainment, License Agreement For Program Material, Including Sports Rights Advances, Expected Amortization, Year One Entertainment, License Agreement For Program Material, Including Sports Rights Advances, Expected Amortization, Year One Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] Schedule of cost of revenue Schedule Of Cost Of Revenue [Table Text 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