<?xml version="1.0" encoding="utf-8"?>
<FilingSummary xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <Version>2.4.0.6</Version>
  <ProcessingTime />
  <ReportFormat>Html</ReportFormat>
  <ContextCount>245</ContextCount>
  <ElementCount>228</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>56</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>3</UnitCount>
  <MyReports>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>000090 - Document - Document and Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/DocumentDocumentAndEntityInformation</Role>
      <ShortName>Document and Entity Information</ShortName>
    </Report>
    <Report>
      <IsDefault>true</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>000100 - Statement - Consolidated Balance Sheet</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/StatementConsolidatedBalanceSheet</Role>
      <ShortName>Consolidated Balance Sheet</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>000105 - Statement - Consolidated Balance Sheet (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/ConsolidatedBalanceSheetParenthetical</Role>
      <ShortName>Consolidated Balance Sheet (Parenthetical)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>000200 - Statement - Consolidated Statement of Income</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/StatementConsolidatedStatementOfIncome</Role>
      <ShortName>Consolidated Statement of Income</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>000205 - Statement - Consolidated Statement of Comprehensive Income</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/StatementConsolidatedStatementOfComprehensiveIncome</Role>
      <ShortName>Consolidated Statement of Comprehensive Income</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>000300 - Statement - Consolidated Statement of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/StatementConsolidatedStatementOfCashFlows</Role>
      <ShortName>Consolidated Statement of Cash Flows</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>000400 - Statement - Consolidated Statement of Changes in Equity [Predecessor]</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/StatementConsolidatedStatementOfChangesInEquityPredecessor</Role>
      <ShortName>Consolidated Statement of Changes in Equity [Predecessor]</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>000450 - Statement - Consolidated Statement of Changes in Equity [Successor]</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/StatementConsolidatedStatementOfChangesInEquitySuccessor</Role>
      <ShortName>Consolidated Statement of Changes in Equity [Successor]</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>010101 - Disclosure - Condensed Consolidated Financial Statements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/CondensedConsolidatedFinancialStatements</Role>
      <ShortName>Condensed Consolidated Financial Statements</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>010151 - Disclosure - Related Party Transactions</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/RelatedPartyTransactions</Role>
      <ShortName>Related Party Transactions</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>010511 - Disclosure - Film and Television Costs</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/FilmAndTelevisionCosts</Role>
      <ShortName>Film and Television Costs</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>010601 - Disclosure - Investments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/Investments</Role>
      <ShortName>Investments</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>010801 - Disclosure - Goodwill</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/Goodwill</Role>
      <ShortName>Goodwill</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>010901 - Disclosure - Long-Term Debt</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/LongTermDebt</Role>
      <ShortName>Long-Term Debt</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>011001 - Disclosure - Derivative Financial Instruments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/DerivativeFinancialInstruments</Role>
      <ShortName>Derivative Financial Instruments</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>011101 - Disclosure - Fair Value Measurements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/FairValueMeasurements</Role>
      <ShortName>Fair Value Measurements</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>011201 - Disclosure - Noncontrolling Interests</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/NoncontrollingInterests</Role>
      <ShortName>Noncontrolling Interests</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>011301 - Disclosure - Pension Plans and Postretirement Benefits</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/PensionPlansAndPostretirementBenefits</Role>
      <ShortName>Pension Plans and Postretirement Benefits</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>011501 - Disclosure - Share-Based Compensation</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/ShareBasedCompensation</Role>
      <ShortName>Share-Based Compensation</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>011701 - Disclosure - Supplemental Financial Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/SupplementalFinancialInformation</Role>
      <ShortName>Supplemental Financial Information</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>011702 - Disclosure - Receivables Monetization</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/ReceivablesMonetization</Role>
      <ShortName>Receivables Monetization</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>011901 - Disclosure - Financial Data by Business Segment</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/FinancialDataByBusinessSegment</Role>
      <ShortName>Financial Data by Business Segment</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>012201 - Disclosure - Condensed Consolidating Financial Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/CondensedConsolidatingFinancialInformation</Role>
      <ShortName>Condensed Consolidating Financial Information</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>020202 - Disclosure - Derivative Financial Instruments (Policy)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/DerivativeFinancialInstrumentsPolicy</Role>
      <ShortName>Derivative Financial Instruments (Policy)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>030100 - Disclosure - Related Party Transactions (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/RelatedPartyTransactionsTables</Role>
      <ShortName>Related Party Transactions (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>030513 - Disclosure - Film and Television Costs (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/FilmAndTelevisionCostsTables</Role>
      <ShortName>Film and Television Costs (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>030603 - Disclosure - Investments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/InvestmentsTables</Role>
      <ShortName>Investments (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>030803 - Disclosure - Goodwill (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/GoodwillTables</Role>
      <ShortName>Goodwill (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>031103 - Disclosure - Fair Value Measurements (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/FairValueMeasurementsTables</Role>
      <ShortName>Fair Value Measurements (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>031203 - Disclosure - Noncontrolling Interests (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/NoncontrollingInterestsTables</Role>
      <ShortName>Noncontrolling Interests (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>031303 - Disclosure - Postretirement, Pension and Other Employee Benefit Plans (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/PostretirementPensionAndOtherEmployeeBenefitPlansTables</Role>
      <ShortName>Postretirement, Pension and Other Employee Benefit Plans (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>031503 - Disclosure - Share-Based Compensation (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/ShareBasedCompensationTables</Role>
      <ShortName>Share-Based Compensation (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>031703 - Disclosure - Supplemental Financial Information (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/SupplementalFinancialInformationTables</Role>
      <ShortName>Supplemental Financial Information (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>031704 - Disclosure - Receivables Monetization (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/ReceivablesMonetizationTables</Role>
      <ShortName>Receivables Monetization (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>031903 - Disclosure - Financial Data by Business Segment (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/FinancialDataByBusinessSegmentTables</Role>
      <ShortName>Financial Data by Business Segment (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>032203 - Disclosure - Condensed Consolidating Financial Information (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/CondensedConsolidatingFinancialInformationTables</Role>
      <ShortName>Condensed Consolidating Financial Information (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>040101 - Disclosure - Condensed Consolidated Financial Statements (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/DisclosureCondensedConsolidatedFinancialStatementsDetails</Role>
      <ShortName>Condensed Consolidated Financial Statements (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>040250 - Disclosure - Related Party Transactions (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/RelatedPartyTransactionsNarrativeDetails</Role>
      <ShortName>Related Party Transactions (Narrative) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>040300 - Disclosure - Related Party Transactions - Condensed Consolidated Balance Sheet (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/RelatedPartyTransactionsCondensedConsolidatedBalanceSheetDetails</Role>
      <ShortName>Related Party Transactions - Condensed Consolidated Balance Sheet (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>040320 - Disclosure - Related Party Transactions - Condensed Consolidated Statement of Income (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/RelatedPartyTransactionsCondensedConsolidatedStatementOfIncomeDetails</Role>
      <ShortName>Related Party Transactions - Condensed Consolidated Statement of Income (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>040532 - Disclosure - Film and Television Costs (Film and Television Costs)(Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/FilmAndTelevisionCostsFilmAndTelevisionCostsDetails</Role>
      <ShortName>Film and Television Costs (Film and Television Costs)(Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>040601 - Disclosure - Investments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/DisclosureInvestmentsDetails</Role>
      <ShortName>Investments (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>040603 - Disclosure - Investments (Equity Method Investments) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/DisclosureInvestmentsEquityMethodInvestmentsDetails</Role>
      <ShortName>Investments (Equity Method Investments) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>040801 - Disclosure - Goodwill (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/DisclosureGoodwillDetails</Role>
      <ShortName>Goodwill (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>040802 - Disclosure - Goodwill Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/GoodwillNarrativeDetails</Role>
      <ShortName>Goodwill Narrative (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>040901 - Disclosure - Long-Term Debt (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/DisclosureLongTermDebtDetails</Role>
      <ShortName>Long-Term Debt (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>040904 - Disclosure - Long-Term Debt (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/LongTermDebtNarrativeDetails</Role>
      <ShortName>Long-Term Debt (Narrative) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>041104 - Disclosure - Fair Value Measurements (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/DisclosureFairValueMeasurementsDetails</Role>
      <ShortName>Fair Value Measurements (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>041150 - Disclosure - Fair Value Disclosure Rollforward (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/DisclosureFairValueDisclosureRollforwardDetails</Role>
      <ShortName>Fair Value Disclosure Rollforward (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>041204 - Disclosure - Noncontrolling Interests (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/DisclosureNoncontrollingInterestsDetails</Role>
      <ShortName>Noncontrolling Interests (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>041250 - Disclosure - Redeemable Noncontrolling Interests (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/DisclosureRedeemableNoncontrollingInterestsDetails</Role>
      <ShortName>Redeemable Noncontrolling Interests (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>041302 - Disclosure - Pension Plans and Postretirement Benefits (Components of Benefits Expense)(Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/PensionPlansAndPostretirementBenefitsComponentsOfBenefitsExpenseDetails</Role>
      <ShortName>Pension Plans and Postretirement Benefits (Components of Benefits Expense)(Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>041502 - Disclosure - Share-Based Compensation (Recognized Share-Based Compensation Expense) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/ShareBasedCompensationRecognizedShareBasedCompensationExpenseDetails</Role>
      <ShortName>Share-Based Compensation (Recognized Share-Based Compensation Expense) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>041701 - Disclosure - Supplemental Financial Information (Receivables)(Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/SupplementalFinancialInformationReceivablesDetails</Role>
      <ShortName>Supplemental Financial Information (Receivables)(Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>041702 - Disclosure - Supplemental Financial Information (Components of Accumulated Other Comprehensive Income (Loss)) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/SupplementalFinancialInformationComponentsOfAccumulatedOtherComprehensiveIncomeLossDetails</Role>
      <ShortName>Supplemental Financial Information (Components of Accumulated Other Comprehensive Income (Loss)) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>041703 - Disclosure - Supplemental Financial Information (Operating Costs and Expenses (Excluding Depreciation and Amortization))(Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/SupplementalFinancialInformationOperatingCostsAndExpensesExcludingDepreciationAndAmortizationDetails</Role>
      <ShortName>Supplemental Financial Information (Operating Costs and Expenses (Excluding Depreciation and Amortization))(Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>041704 - Disclosure - Supplemental Financial Information (Net Cash Provided By Operating Activites)(Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/SupplementalFinancialInformationNetCashProvidedByOperatingActivitesDetails</Role>
      <ShortName>Supplemental Financial Information (Net Cash Provided By Operating Activites)(Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>041730 - Disclosure - Supplemental Financial Information (Cash Payments for Interest and Income Taxes)(Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/SupplementalFinancialInformationCashPaymentsForInterestAndIncomeTaxesDetails</Role>
      <ShortName>Supplemental Financial Information (Cash Payments for Interest and Income Taxes)(Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>041733 - Disclosure - Supplemental Financial Information (Noncash Investing and Financing Activities)(Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/DisclosureSupplementalFinancialInformationNoncashInvestingAndFinancingActivitiesDetails</Role>
      <ShortName>Supplemental Financial Information (Noncash Investing and Financing Activities)(Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>041737 - Disclosure - Supplemental Financial Information (Other Cash Flow Information)(Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/SupplementalFinancialInformationOtherCashFlowInformationDetails</Role>
      <ShortName>Supplemental Financial Information (Other Cash Flow Information)(Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>041756 - Disclosure - Receivables Monetization (Narrative)(Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/ReceivablesMonetizationNarrativeDetails</Role>
      <ShortName>Receivables Monetization (Narrative)(Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>041757 - Disclosure - Receivables Monetization (Effect on Income From Receivables Monetization and Cash Flows on Transfers)(Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/ReceivablesMonetizationEffectOnIncomeFromReceivablesMonetizationAndCashFlowsOnTransfersDetails</Role>
      <ShortName>Receivables Monetization (Effect on Income From Receivables Monetization and Cash Flows on Transfers)(Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>041758 - Disclosure - Receivables Monetization (Receivables Monetized and Deferred Consideration)(Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/ReceivablesMonetizationReceivablesMonetizedAndDeferredConsiderationDetails</Role>
      <ShortName>Receivables Monetization (Receivables Monetized and Deferred Consideration)(Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>041901 - Disclosure - Financial Data by Business Segment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/DisclosureFinancialDataByBusinessSegmentDetails</Role>
      <ShortName>Financial Data by Business Segment (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>042201 - Disclosure - Condensed Consolidating Financial Information (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/CondensedConsolidatingFinancialInformationNarrativeDetails</Role>
      <ShortName>Condensed Consolidating Financial Information (Narrative) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>042202 - Disclosure - Condensed Consolidating Financial Information (Condensed Consolidating Balance Sheet) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/DisclosureCondensedConsolidatingFinancialInformationCondensedConsolidatingBalanceSheetDetails</Role>
      <ShortName>Condensed Consolidating Financial Information (Condensed Consolidating Balance Sheet) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>042203 - Disclosure - Condensed Consolidating Financial Information (Condensed Consolidating Statement of Income) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/CondensedConsolidatingFinancialInformationCondensedConsolidatingStatementOfIncomeDetails</Role>
      <ShortName>Condensed Consolidating Financial Information (Condensed Consolidating Statement of Income) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>042204 - Disclosure - Condensed Consolidating Financial Information (Condensed Consolidating Statement of Cash Flows) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nbcuni.com/role/DisclosureCondensedConsolidatingFinancialInformationCondensedConsolidatingStatementOfCashFlowsDetails</Role>
      <ShortName>Condensed Consolidating Financial Information (Condensed Consolidating Statement of Cash Flows) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <Logs>
    <Log type="Info">Element us-gaap_DebtInstrumentFaceAmount had a mix of decimals attribute values: -9 -6.</Log>
    <Log type="Info">'Monetary' elements on report '040603 - Disclosure - Investments (Equity Method Investments) (Details)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">'Monetary' elements on report '040904 - Disclosure - Long-Term Debt (Narrative) (Details)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">Process Flow-Through: 000100 - Statement - Consolidated Balance Sheet</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Jun. 30, 2012'</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Sep. 30, 2011'</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Jun. 30, 2011'</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Jan. 28, 2011'</Log>
    <Log type="Info">Process Flow-Through: 000105 - Statement - Consolidated Balance Sheet (Parenthetical)</Log>
    <Log type="Info">Process Flow-Through: 000200 - Statement - Consolidated Statement of Income</Log>
    <Log type="Info">Process Flow-Through: 000205 - Statement - Consolidated Statement of Comprehensive Income</Log>
    <Log type="Info">Process Flow-Through: 000300 - Statement - Consolidated Statement of Cash Flows</Log>
  </Logs>
  <InputFiles>
    <File>ck0000902739-20120930.xml</File>
    <File>ck0000902739-20120930.xsd</File>
    <File>ck0000902739-20120930_cal.xml</File>
    <File>ck0000902739-20120930_def.xml</File>
    <File>ck0000902739-20120930_lab.xml</File>
    <File>ck0000902739-20120930_pre.xml</File>
  </InputFiles>
  <SupplementalFiles />
  <BaseTaxonomies />
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
