<?xml version='1.0' encoding='UTF-8'?>
<FilingSummary>
  <Version>3.3.1.900</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>261</ContextCount>
  <ElementCount>342</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>80</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>6</UnitCount>
  <MyReports>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>0001000 - Document - Document and Entity Information Document</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/DocumentAndEntityInformationDocument</Role>
      <ShortName>Document and Entity Information Document</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>1001000 - Statement - Condensed Consolidated Statement of Financial Position</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/CondensedConsolidatedStatementOfFinancialPosition</Role>
      <ShortName>Condensed Consolidated Statement of Financial Position</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>1002500 - Statement - Condensed Consolidated Statement of Financial Position (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/CondensedConsolidatedStatementOfFinancialPositionParenthetical</Role>
      <ShortName>Condensed Consolidated Statement of Financial Position (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>1003000 - Statement - Condensed Consolidated Statement of Operations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/CondensedConsolidatedStatementOfOperations</Role>
      <ShortName>Condensed Consolidated Statement of Operations</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>1004000 - Statement - Condensed Consolidated Statement of Comprehensive Income</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/CondensedConsolidatedStatementOfComprehensiveIncome</Role>
      <ShortName>Condensed Consolidated Statement of Comprehensive Income</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>1005500 - Statement - Condensed Consolidated Statement of Comprehensive Income (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/CondensedConsolidatedStatementOfComprehensiveIncomeParenthetical</Role>
      <ShortName>Condensed Consolidated Statement of Comprehensive Income (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>1007000 - Statement - Condensed Consolidated Statement of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/CondensedConsolidatedStatementOfCashFlows</Role>
      <ShortName>Condensed Consolidated Statement of Cash Flows</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>1008000 - Statement - Condensed Consolidated Statement of Equity Statement</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/CondensedConsolidatedStatementOfEquityStatement</Role>
      <ShortName>Condensed Consolidated Statement of Equity Statement</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>2101100 - Disclosure - Business Description and Basis of Presentation</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/BusinessDescriptionAndBasisOfPresentation</Role>
      <ShortName>Business Description and Basis of Presentation</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>2103100 - Disclosure - Recently Issued Accounting Standards</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/RecentlyIssuedAccountingStandards</Role>
      <ShortName>Recently Issued Accounting Standards</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>2105100 - Disclosure - Acquisitions, Goodwill and Intangible Assets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/AcquisitionsGoodwillAndIntangibleAssets</Role>
      <ShortName>Acquisitions, Goodwill and Intangible Assets</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>2106100 - Disclosure - Discontinued Operations and Divestitures</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/DiscontinuedOperationsAndDivestitures</Role>
      <ShortName>Discontinued Operations and Divestitures</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>2107100 - Disclosure - Receivables, Net</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/ReceivablesNet</Role>
      <ShortName>Receivables, Net</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>2108100 - Disclosure - Inventories, Net</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/InventoriesNet</Role>
      <ShortName>Inventories, Net</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>2110100 - Disclosure - Other Assets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/OtherAssets</Role>
      <ShortName>Other Assets</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>2112100 - Disclosure - Debt</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/Debt</Role>
      <ShortName>Debt</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>2113100 - Disclosure - Retirement Benefits</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/RetirementBenefits</Role>
      <ShortName>Retirement Benefits</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>2114100 - Disclosure - Stock-Based Compensation and Earnings Per Share</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/StockBasedCompensationAndEarningsPerShare</Role>
      <ShortName>Stock-Based Compensation and Earnings Per Share</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>2115100 - Disclosure - Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Loss</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/AccumulatedOtherComprehensiveLossAccumulatedOtherComprehensiveLoss</Role>
      <ShortName>Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Loss</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>2119100 - Disclosure - Income Taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/IncomeTaxes</Role>
      <ShortName>Income Taxes</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>2120100 - Disclosure - Fair Value Measurements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/FairValueMeasurements</Role>
      <ShortName>Fair Value Measurements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>2121100 - Disclosure - Derivative Financial Instruments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/DerivativeFinancialInstruments</Role>
      <ShortName>Derivative Financial Instruments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>2122100 - Disclosure - Guarantees and Indemnifications</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/GuaranteesAndIndemnifications</Role>
      <ShortName>Guarantees and Indemnifications</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>2124100 - Disclosure - Environmental Matters</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/EnvironmentalMatters</Role>
      <ShortName>Environmental Matters</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>2125100 - Disclosure - Legal Matters</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/LegalMatters</Role>
      <ShortName>Legal Matters</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>2126100 - Disclosure - Restructuring and Asset Impairment Charges</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/RestructuringAndAssetImpairmentCharges</Role>
      <ShortName>Restructuring and Asset Impairment Charges</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>26</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>2127100 - Disclosure - Business Segment Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/BusinessSegmentInformation</Role>
      <ShortName>Business Segment Information</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>27</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>2201201 - Disclosure - Business Description and Basis of Presentation (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/BusinessDescriptionAndBasisOfPresentationPolicies</Role>
      <ShortName>Business Description and Basis of Presentation (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://www.rockwellcollins.com/role/RecentlyIssuedAccountingStandards</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>2305301 - Disclosure - Acquisitions, Goodwill and Intangible Assets (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/AcquisitionsGoodwillAndIntangibleAssetsTables</Role>
      <ShortName>Acquisitions, Goodwill and Intangible Assets (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.rockwellcollins.com/role/AcquisitionsGoodwillAndIntangibleAssets</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>2306301 - Disclosure - Discontinued Operations and Divestitures (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/DiscontinuedOperationsAndDivestituresTables</Role>
      <ShortName>Discontinued Operations and Divestitures (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.rockwellcollins.com/role/DiscontinuedOperationsAndDivestitures</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>2307301 - Disclosure - Receivables, Net (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/ReceivablesNetTables</Role>
      <ShortName>Receivables, Net (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.rockwellcollins.com/role/ReceivablesNet</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>2308301 - Disclosure - Inventories, Net (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/InventoriesNetTables</Role>
      <ShortName>Inventories, Net (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.rockwellcollins.com/role/InventoriesNet</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>2310301 - Disclosure - Other Assets (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/OtherAssetsTables</Role>
      <ShortName>Other Assets (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.rockwellcollins.com/role/OtherAssets</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>2312301 - Disclosure - Debt (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/DebtTables</Role>
      <ShortName>Debt (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.rockwellcollins.com/role/Debt</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>2313301 - Disclosure - Retirement Benefits (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/RetirementBenefitsTables</Role>
      <ShortName>Retirement Benefits (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.rockwellcollins.com/role/RetirementBenefits</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>2314301 - Disclosure - Stock-Based Compensation and Earnings Per Share (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/StockBasedCompensationAndEarningsPerShareTables</Role>
      <ShortName>Stock-Based Compensation and Earnings Per Share (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.rockwellcollins.com/role/StockBasedCompensationAndEarningsPerShare</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>2315301 - Disclosure - Accumulated Other Comprehensive Loss (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/AccumulatedOtherComprehensiveLossTables</Role>
      <ShortName>Accumulated Other Comprehensive Loss (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.rockwellcollins.com/role/AccumulatedOtherComprehensiveLossAccumulatedOtherComprehensiveLoss</ParentRole>
      <Position>37</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>2320301 - Disclosure - Fair Value Measurements (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/FairValueMeasurementsTables</Role>
      <ShortName>Fair Value Measurements (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.rockwellcollins.com/role/FairValueMeasurements</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>2321301 - Disclosure - Derivative Financial Instruments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/DerivativeFinancialInstrumentsTables</Role>
      <ShortName>Derivative Financial Instruments (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.rockwellcollins.com/role/DerivativeFinancialInstruments</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>2322301 - Disclosure - Guarantees and Indemnifications (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/GuaranteesAndIndemnificationsTables</Role>
      <ShortName>Guarantees and Indemnifications (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.rockwellcollins.com/role/GuaranteesAndIndemnifications</ParentRole>
      <Position>40</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>2326301 - Disclosure - Restructuring and Asset Impairment Charges (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/RestructuringAndAssetImpairmentChargesTables</Role>
      <ShortName>Restructuring and Asset Impairment Charges (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.rockwellcollins.com/role/RestructuringAndAssetImpairmentCharges</ParentRole>
      <Position>41</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>2327301 - Disclosure - Business Segment Information (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/BusinessSegmentInformationTables</Role>
      <ShortName>Business Segment Information (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.rockwellcollins.com/role/BusinessSegmentInformation</ParentRole>
      <Position>42</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>2403401 - Disclosure - Recently Issued Accounting Standards (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/RecentlyIssuedAccountingStandardsDetails</Role>
      <ShortName>Recently Issued Accounting Standards (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>2405402 - Disclosure - Acquisitions, Goodwill and Intangible Assets (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/AcquisitionsGoodwillAndIntangibleAssetsNarrativeDetails</Role>
      <ShortName>Acquisitions, Goodwill and Intangible Assets (Narrative) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.rockwellcollins.com/role/AcquisitionsGoodwillAndIntangibleAssetsTables</ParentRole>
      <Position>44</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>2405403 - Disclosure - Acquisitions, Goodwill and Intangible Assets (Changes in the carrying amount of goodwill) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/AcquisitionsGoodwillAndIntangibleAssetsChangesInCarryingAmountOfGoodwillDetails</Role>
      <ShortName>Acquisitions, Goodwill and Intangible Assets (Changes in the carrying amount of goodwill) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.rockwellcollins.com/role/AcquisitionsGoodwillAndIntangibleAssetsTables</ParentRole>
      <Position>45</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>2405404 - Disclosure - Acquisitions, Goodwill and Intangible Assets (Summary of intangible assets) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/AcquisitionsGoodwillAndIntangibleAssetsSummaryOfIntangibleAssetsDetails</Role>
      <ShortName>Acquisitions, Goodwill and Intangible Assets (Summary of intangible assets) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.rockwellcollins.com/role/AcquisitionsGoodwillAndIntangibleAssetsTables</ParentRole>
      <Position>46</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>2405405 - Disclosure - Acquisitions, Goodwill and Intangible Assets (Expected annual amortization expense for intangible assets) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/AcquisitionsGoodwillAndIntangibleAssetsExpectedAnnualAmortizationExpenseForIntangibleAssetsDetails</Role>
      <ShortName>Acquisitions, Goodwill and Intangible Assets (Expected annual amortization expense for intangible assets) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.rockwellcollins.com/role/AcquisitionsGoodwillAndIntangibleAssetsTables</ParentRole>
      <Position>47</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>2406402 - Disclosure - Discontinued Operations and Divestitures (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/DiscontinuedOperationsAndDivestituresDetails</Role>
      <ShortName>Discontinued Operations and Divestitures (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.rockwellcollins.com/role/DiscontinuedOperationsAndDivestituresTables</ParentRole>
      <Position>48</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>2407402 - Disclosure - Receivables, Net (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/ReceivablesNetDetails</Role>
      <ShortName>Receivables, Net (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.rockwellcollins.com/role/ReceivablesNetTables</ParentRole>
      <Position>49</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>2408402 - Disclosure - Inventories, Net (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/InventoriesNetDetails</Role>
      <ShortName>Inventories, Net (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.rockwellcollins.com/role/InventoriesNetTables</ParentRole>
      <Position>50</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>2410402 - Disclosure - Other Assets (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/OtherAssetsNarrativeDetails</Role>
      <ShortName>Other Assets (Narrative) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.rockwellcollins.com/role/OtherAssetsTables</ParentRole>
      <Position>51</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>2410403 - Disclosure - Other Assets (Summary of other assets) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/OtherAssetsSummaryOfOtherAssetsDetails</Role>
      <ShortName>Other Assets (Summary of other assets) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.rockwellcollins.com/role/OtherAssetsTables</ParentRole>
      <Position>52</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>2412402 - Disclosure - Debt (Short-term Debt) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/DebtShortTermDebtDetails</Role>
      <ShortName>Debt (Short-term Debt) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.rockwellcollins.com/role/DebtTables</ParentRole>
      <Position>53</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>2412403 - Disclosure - Debt (Revolving Credit Facilities) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/DebtRevolvingCreditFacilitiesDetails</Role>
      <ShortName>Debt (Revolving Credit Facilities) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.rockwellcollins.com/role/DebtTables</ParentRole>
      <Position>54</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>2412404 - Disclosure - Debt (Long-term Debt) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/DebtLongTermDebtDetails</Role>
      <ShortName>Debt (Long-term Debt) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.rockwellcollins.com/role/DebtTables</ParentRole>
      <Position>55</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>2413402 - Disclosure - Retirement Benefits (Components of Expense (Income)) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/RetirementBenefitsComponentsOfExpenseIncomeDetails</Role>
      <ShortName>Retirement Benefits (Components of Expense (Income)) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.rockwellcollins.com/role/RetirementBenefitsTables</ParentRole>
      <Position>56</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>2413403 - Disclosure - Retirement Benefits (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/RetirementBenefitsNarrativeDetails</Role>
      <ShortName>Retirement Benefits (Narrative) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.rockwellcollins.com/role/RetirementBenefitsTables</ParentRole>
      <Position>57</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>2414402 - Disclosure - Stock-Based Compensation and Earnings Per Share (Stock-Based Compensation Expense) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/StockBasedCompensationAndEarningsPerShareStockBasedCompensationExpenseDetails</Role>
      <ShortName>Stock-Based Compensation and Earnings Per Share (Stock-Based Compensation Expense) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.rockwellcollins.com/role/StockBasedCompensationAndEarningsPerShareTables</ParentRole>
      <Position>58</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>2414403 - Disclosure - Stock-Based Compensation and Earnings Per Share (Awards of Equity Instruments) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/StockBasedCompensationAndEarningsPerShareAwardsOfEquityInstrumentsDetails</Role>
      <ShortName>Stock-Based Compensation and Earnings Per Share (Awards of Equity Instruments) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.rockwellcollins.com/role/StockBasedCompensationAndEarningsPerShareTables</ParentRole>
      <Position>59</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>2414404 - Disclosure - Stock-Based Compensation and Earnings Per Share (Stock Option Fair Value Information) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/StockBasedCompensationAndEarningsPerShareStockOptionFairValueInformationDetails</Role>
      <ShortName>Stock-Based Compensation and Earnings Per Share (Stock Option Fair Value Information) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.rockwellcollins.com/role/StockBasedCompensationAndEarningsPerShareTables</ParentRole>
      <Position>60</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>2414405 - Disclosure - Stock-Based Compensation and Earnings Per Share (Earnings Per Share and Diluted Share Equivalents) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/StockBasedCompensationAndEarningsPerShareEarningsPerShareAndDilutedShareEquivalentsDetails</Role>
      <ShortName>Stock-Based Compensation and Earnings Per Share (Earnings Per Share and Diluted Share Equivalents) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.rockwellcollins.com/role/StockBasedCompensationAndEarningsPerShareTables</ParentRole>
      <Position>61</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>2415402 - Disclosure - Accumulated Other Comprehensive Loss (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/AccumulatedOtherComprehensiveLossDetails</Role>
      <ShortName>Accumulated Other Comprehensive Loss (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.rockwellcollins.com/role/AccumulatedOtherComprehensiveLossTables</ParentRole>
      <Position>62</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>2419401 - Disclosure - Income Taxes (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/IncomeTaxesNarrativeDetails</Role>
      <ShortName>Income Taxes (Narrative) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.rockwellcollins.com/role/IncomeTaxes</ParentRole>
      <Position>63</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>2420402 - Disclosure - Fair Value Measurements (Fair Value of Financial Assets and Liabilities Measured on a Recurring Basis) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/FairValueMeasurementsFairValueOfFinancialAssetsAndLiabilitiesMeasuredOnRecurringBasisDetails</Role>
      <ShortName>Fair Value Measurements (Fair Value of Financial Assets and Liabilities Measured on a Recurring Basis) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.rockwellcollins.com/role/FairValueMeasurementsTables</ParentRole>
      <Position>64</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>2420403 - Disclosure - Fair Value Measurements Fair Value Measurements (Fair Value of Financial Assets Measured on a Non-recurring Basis) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/FairValueMeasurementsFairValueMeasurementsFairValueOfFinancialAssetsMeasuredOnNonRecurringBasisDetails</Role>
      <ShortName>Fair Value Measurements Fair Value Measurements (Fair Value of Financial Assets Measured on a Non-recurring Basis) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>65</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>2420404 - Disclosure - Fair Value Measurements (Carrying Amounts and Fair Values of Financial Instruments) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/FairValueMeasurementsCarryingAmountsAndFairValuesOfFinancialInstrumentsDetails</Role>
      <ShortName>Fair Value Measurements (Carrying Amounts and Fair Values of Financial Instruments) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.rockwellcollins.com/role/FairValueMeasurementsTables</ParentRole>
      <Position>66</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>2421402 - Disclosure - Derivative Financial Instruments (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/DerivativeFinancialInstrumentsNarrativeDetails</Role>
      <ShortName>Derivative Financial Instruments (Narrative) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.rockwellcollins.com/role/DerivativeFinancialInstrumentsTables</ParentRole>
      <Position>67</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>2421403 - Disclosure - Derivative Financial Instruments (Fair Values of Derivative Instruments) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/DerivativeFinancialInstrumentsFairValuesOfDerivativeInstrumentsDetails</Role>
      <ShortName>Derivative Financial Instruments (Fair Values of Derivative Instruments) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.rockwellcollins.com/role/DerivativeFinancialInstrumentsTables</ParentRole>
      <Position>68</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>2421404 - Disclosure - Derivative Financial Instruments (Effect of Derivative Instruments) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/DerivativeFinancialInstrumentsEffectOfDerivativeInstrumentsDetails</Role>
      <ShortName>Derivative Financial Instruments (Effect of Derivative Instruments) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.rockwellcollins.com/role/DerivativeFinancialInstrumentsTables</ParentRole>
      <Position>69</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>2422402 - Disclosure - Guarantees and Indemnifications (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/GuaranteesAndIndemnificationsDetails</Role>
      <ShortName>Guarantees and Indemnifications (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.rockwellcollins.com/role/GuaranteesAndIndemnificationsTables</ParentRole>
      <Position>70</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>2424401 - Disclosure - Environmental Matters (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/EnvironmentalMattersDetails</Role>
      <ShortName>Environmental Matters (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.rockwellcollins.com/role/EnvironmentalMatters</ParentRole>
      <Position>71</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>2426402 - Disclosure - Restructuring and Asset Impairment Charges (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/RestructuringAndAssetImpairmentChargesDetails</Role>
      <ShortName>Restructuring and Asset Impairment Charges (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.rockwellcollins.com/role/RestructuringAndAssetImpairmentChargesTables</ParentRole>
      <Position>72</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>2427402 - Disclosure - Business Segment Information (Sales and Earnings of Operating Segments) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/BusinessSegmentInformationSalesAndEarningsOfOperatingSegmentsDetails</Role>
      <ShortName>Business Segment Information (Sales and Earnings of Operating Segments) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.rockwellcollins.com/role/BusinessSegmentInformationTables</ParentRole>
      <Position>73</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>2427403 - Disclosure - Business Segment Information (Summary of Sales by Product Category) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/BusinessSegmentInformationSummaryOfSalesByProductCategoryDetails</Role>
      <ShortName>Business Segment Information (Summary of Sales by Product Category) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.rockwellcollins.com/role/BusinessSegmentInformationTables</ParentRole>
      <Position>74</Position>
    </Report>
    <Report instance="col-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>2427404 - Disclosure - Business Segment Information (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.rockwellcollins.com/role/BusinessSegmentInformationNarrativeDetails</Role>
      <ShortName>Business Segment Information (Narrative) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.rockwellcollins.com/role/BusinessSegmentInformationTables</ParentRole>
      <Position>75</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File>col-20160331.xml</File>
    <File>col-20160331.xsd</File>
    <File>col-20160331_cal.xml</File>
    <File>col-20160331_def.xml</File>
    <File>col-20160331_lab.xml</File>
    <File>col-20160331_pre.xml</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies/>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
