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    <link:label id="lab_cdw_NetcommProductsMember_50B84D761A0850A96D8A7533656613E3_terseLabel_en-US" xlink:label="lab_cdw_NetcommProductsMember_50B84D761A0850A96D8A7533656613E3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Netcomm Products</link:label>
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    <link:loc xlink:href="cdw-20200331.xsd#cdw_SalesChannelSmallBusinessMember" xlink:label="loc_cdw_SalesChannelSmallBusinessMember_B0673B6404C5976F7F8F753365682CF1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cdw_SalesChannelSmallBusinessMember_B0673B6404C5976F7F8F753365682CF1" xlink:to="lab_cdw_SalesChannelSmallBusinessMember_B0673B6404C5976F7F8F753365682CF1" xlink:type="arc" />
    <link:label id="lab_cdw_SalesChannelGovernmentMember_D47343B17C5C1E438D0D753365693F04_terseLabel_en-US" xlink:label="lab_cdw_SalesChannelGovernmentMember_D47343B17C5C1E438D0D753365693F04" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Government</link:label>
    <link:label id="lab_cdw_SalesChannelGovernmentMember_D47343B17C5C1E438D0D753365693F04_label_en-US" xlink:label="lab_cdw_SalesChannelGovernmentMember_D47343B17C5C1E438D0D753365693F04" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Sales Channel, Government [Member]</link:label>
    <link:label id="lab_cdw_SalesChannelGovernmentMember_D47343B17C5C1E438D0D753365693F04_documentation_en-US" xlink:label="lab_cdw_SalesChannelGovernmentMember_D47343B17C5C1E438D0D753365693F04" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Sales Channel, Government [Member]</link:label>
    <link:loc xlink:href="cdw-20200331.xsd#cdw_SalesChannelGovernmentMember" xlink:label="loc_cdw_SalesChannelGovernmentMember_D47343B17C5C1E438D0D753365693F04" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cdw_SalesChannelGovernmentMember_D47343B17C5C1E438D0D753365693F04" xlink:to="lab_cdw_SalesChannelGovernmentMember_D47343B17C5C1E438D0D753365693F04" xlink:type="arc" />
    <link:label id="lab_cdw_SalesChannelEducationMember_DFA4B30B0049C19B2A7175336569D70B_terseLabel_en-US" xlink:label="lab_cdw_SalesChannelEducationMember_DFA4B30B0049C19B2A7175336569D70B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Education</link:label>
    <link:label id="lab_cdw_SalesChannelEducationMember_DFA4B30B0049C19B2A7175336569D70B_label_en-US" xlink:label="lab_cdw_SalesChannelEducationMember_DFA4B30B0049C19B2A7175336569D70B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Sales Channel, Education [Member]</link:label>
    <link:label id="lab_cdw_SalesChannelEducationMember_DFA4B30B0049C19B2A7175336569D70B_documentation_en-US" xlink:label="lab_cdw_SalesChannelEducationMember_DFA4B30B0049C19B2A7175336569D70B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Sales Channel, Education [Member]</link:label>
    <link:loc xlink:href="cdw-20200331.xsd#cdw_SalesChannelEducationMember" xlink:label="loc_cdw_SalesChannelEducationMember_DFA4B30B0049C19B2A7175336569D70B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cdw_SalesChannelEducationMember_DFA4B30B0049C19B2A7175336569D70B" xlink:to="lab_cdw_SalesChannelEducationMember_DFA4B30B0049C19B2A7175336569D70B" xlink:type="arc" />
    <link:label id="lab_cdw_SalesChannelHealthcareMember_92B4B027D13AA205207A75336569B459_terseLabel_en-US" xlink:label="lab_cdw_SalesChannelHealthcareMember_92B4B027D13AA205207A75336569B459" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Healthcare</link:label>
    <link:label id="lab_cdw_SalesChannelHealthcareMember_92B4B027D13AA205207A75336569B459_label_en-US" xlink:label="lab_cdw_SalesChannelHealthcareMember_92B4B027D13AA205207A75336569B459" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Sales Channel, Healthcare [Member]</link:label>
    <link:label id="lab_cdw_SalesChannelHealthcareMember_92B4B027D13AA205207A75336569B459_documentation_en-US" xlink:label="lab_cdw_SalesChannelHealthcareMember_92B4B027D13AA205207A75336569B459" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Sales Channel, Healthcare [Member]</link:label>
    <link:loc xlink:href="cdw-20200331.xsd#cdw_SalesChannelHealthcareMember" xlink:label="loc_cdw_SalesChannelHealthcareMember_92B4B027D13AA205207A75336569B459" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cdw_SalesChannelHealthcareMember_92B4B027D13AA205207A75336569B459" xlink:to="lab_cdw_SalesChannelHealthcareMember_92B4B027D13AA205207A75336569B459" xlink:type="arc" />
    <link:label id="lab_cdw_SalesChannelOtherMember_5A8D8B3C5D45D3768BFF753365699E30_terseLabel_en-US" xlink:label="lab_cdw_SalesChannelOtherMember_5A8D8B3C5D45D3768BFF753365699E30" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other</link:label>
    <link:label id="lab_cdw_SalesChannelOtherMember_5A8D8B3C5D45D3768BFF753365699E30_label_en-US" xlink:label="lab_cdw_SalesChannelOtherMember_5A8D8B3C5D45D3768BFF753365699E30" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Sales Channel, Other [Member]</link:label>
    <link:label id="lab_cdw_SalesChannelOtherMember_5A8D8B3C5D45D3768BFF753365699E30_documentation_en-US" xlink:label="lab_cdw_SalesChannelOtherMember_5A8D8B3C5D45D3768BFF753365699E30" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Sales Channel, Other [Member]</link:label>
    <link:loc xlink:href="cdw-20200331.xsd#cdw_SalesChannelOtherMember" xlink:label="loc_cdw_SalesChannelOtherMember_5A8D8B3C5D45D3768BFF753365699E30" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cdw_SalesChannelOtherMember_5A8D8B3C5D45D3768BFF753365699E30" xlink:to="lab_cdw_SalesChannelOtherMember_5A8D8B3C5D45D3768BFF753365699E30" xlink:type="arc" />
    <link:label id="lab_us-gaap_TimingOfTransferOfGoodOrServiceAxis_91847B94622138EDB5CD7533656986EB_terseLabel_en-US" xlink:label="lab_us-gaap_TimingOfTransferOfGoodOrServiceAxis_91847B94622138EDB5CD7533656986EB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Timing of Transfer of Good or Service [Axis]</link:label>
    <link:label id="lab_us-gaap_TimingOfTransferOfGoodOrServiceAxis_91847B94622138EDB5CD7533656986EB_label_en-US" xlink:label="lab_us-gaap_TimingOfTransferOfGoodOrServiceAxis_91847B94622138EDB5CD7533656986EB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Timing of Transfer of Good or Service [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TimingOfTransferOfGoodOrServiceAxis" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_91847B94622138EDB5CD7533656986EB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_91847B94622138EDB5CD7533656986EB" xlink:to="lab_us-gaap_TimingOfTransferOfGoodOrServiceAxis_91847B94622138EDB5CD7533656986EB" xlink:type="arc" />
    <link:label id="lab_us-gaap_TimingOfTransferOfGoodOrServiceDomain_2995432A4E6671DE4D51753365694333_terseLabel_en-US" xlink:label="lab_us-gaap_TimingOfTransferOfGoodOrServiceDomain_2995432A4E6671DE4D51753365694333" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Timing of Transfer of Good or Service [Domain]</link:label>
    <link:label id="lab_us-gaap_TimingOfTransferOfGoodOrServiceDomain_2995432A4E6671DE4D51753365694333_label_en-US" xlink:label="lab_us-gaap_TimingOfTransferOfGoodOrServiceDomain_2995432A4E6671DE4D51753365694333" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Timing of Transfer of Good or Service [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TimingOfTransferOfGoodOrServiceDomain" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_2995432A4E6671DE4D51753365694333" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_2995432A4E6671DE4D51753365694333" xlink:to="lab_us-gaap_TimingOfTransferOfGoodOrServiceDomain_2995432A4E6671DE4D51753365694333" xlink:type="arc" />
    <link:label id="lab_cdw_TransferredAtPointInTimePrincipalMember_CE00D5A94130889D79497533656A372E_terseLabel_en-US" xlink:label="lab_cdw_TransferredAtPointInTimePrincipalMember_CE00D5A94130889D79497533656A372E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Transferred at a point in time where CDW is principal</link:label>
    <link:label id="lab_cdw_TransferredAtPointInTimePrincipalMember_CE00D5A94130889D79497533656A372E_label_en-US" xlink:label="lab_cdw_TransferredAtPointInTimePrincipalMember_CE00D5A94130889D79497533656A372E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Transferred At Point In Time, Principal [Member]</link:label>
    <link:label id="lab_cdw_TransferredAtPointInTimePrincipalMember_CE00D5A94130889D79497533656A372E_documentation_en-US" xlink:label="lab_cdw_TransferredAtPointInTimePrincipalMember_CE00D5A94130889D79497533656A372E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Transferred At Point In Time, Principal [Member]</link:label>
    <link:loc xlink:href="cdw-20200331.xsd#cdw_TransferredAtPointInTimePrincipalMember" xlink:label="loc_cdw_TransferredAtPointInTimePrincipalMember_CE00D5A94130889D79497533656A372E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cdw_TransferredAtPointInTimePrincipalMember_CE00D5A94130889D79497533656A372E" xlink:to="lab_cdw_TransferredAtPointInTimePrincipalMember_CE00D5A94130889D79497533656A372E" xlink:type="arc" />
    <link:label id="lab_cdw_TransferredAtPointInTimeAgentMember_0A96EA992798173BB7657533656AF0BC_terseLabel_en-US" xlink:label="lab_cdw_TransferredAtPointInTimeAgentMember_0A96EA992798173BB7657533656AF0BC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Transferred at a point in time where CDW is agent</link:label>
    <link:label id="lab_cdw_TransferredAtPointInTimeAgentMember_0A96EA992798173BB7657533656AF0BC_label_en-US" xlink:label="lab_cdw_TransferredAtPointInTimeAgentMember_0A96EA992798173BB7657533656AF0BC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Transferred At Point In Time, Agent [Member]</link:label>
    <link:label id="lab_cdw_TransferredAtPointInTimeAgentMember_0A96EA992798173BB7657533656AF0BC_documentation_en-US" xlink:label="lab_cdw_TransferredAtPointInTimeAgentMember_0A96EA992798173BB7657533656AF0BC" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Transferred At Point In Time, Agent [Member]</link:label>
    <link:loc xlink:href="cdw-20200331.xsd#cdw_TransferredAtPointInTimeAgentMember" xlink:label="loc_cdw_TransferredAtPointInTimeAgentMember_0A96EA992798173BB7657533656AF0BC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cdw_TransferredAtPointInTimeAgentMember_0A96EA992798173BB7657533656AF0BC" xlink:to="lab_cdw_TransferredAtPointInTimeAgentMember_0A96EA992798173BB7657533656AF0BC" xlink:type="arc" />
    <link:label id="lab_cdw_TransferredOverTimePrincipalMember_7A8D05D10A6C410448AE7533656AE436_terseLabel_en-US" xlink:label="lab_cdw_TransferredOverTimePrincipalMember_7A8D05D10A6C410448AE7533656AE436" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Transferred over time where CDW is principal</link:label>
    <link:label id="lab_cdw_TransferredOverTimePrincipalMember_7A8D05D10A6C410448AE7533656AE436_label_en-US" xlink:label="lab_cdw_TransferredOverTimePrincipalMember_7A8D05D10A6C410448AE7533656AE436" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Transferred Over Time, Principal [Member]</link:label>
    <link:label id="lab_cdw_TransferredOverTimePrincipalMember_7A8D05D10A6C410448AE7533656AE436_documentation_en-US" xlink:label="lab_cdw_TransferredOverTimePrincipalMember_7A8D05D10A6C410448AE7533656AE436" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Transferred Over Time, Principal [Member]</link:label>
    <link:loc xlink:href="cdw-20200331.xsd#cdw_TransferredOverTimePrincipalMember" xlink:label="loc_cdw_TransferredOverTimePrincipalMember_7A8D05D10A6C410448AE7533656AE436" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cdw_TransferredOverTimePrincipalMember_7A8D05D10A6C410448AE7533656AE436" xlink:to="lab_cdw_TransferredOverTimePrincipalMember_7A8D05D10A6C410448AE7533656AE436" xlink:type="arc" />
    <link:label id="lab_srt_ConsolidationItemsAxis_EE7148D147CB627F61787533656A6B0B_terseLabel_en-US" xlink:label="lab_srt_ConsolidationItemsAxis_EE7148D147CB627F61787533656A6B0B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Consolidation Items [Axis]</link:label>
    <link:label id="lab_srt_ConsolidationItemsAxis_EE7148D147CB627F61787533656A6B0B_label_en-US" xlink:label="lab_srt_ConsolidationItemsAxis_EE7148D147CB627F61787533656A6B0B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Consolidation Items [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ConsolidationItemsAxis" xlink:label="loc_srt_ConsolidationItemsAxis_EE7148D147CB627F61787533656A6B0B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_ConsolidationItemsAxis_EE7148D147CB627F61787533656A6B0B" xlink:to="lab_srt_ConsolidationItemsAxis_EE7148D147CB627F61787533656A6B0B" xlink:type="arc" />
    <link:label id="lab_srt_ConsolidationItemsDomain_E899ABA4B9622601A6AE7533656BACD3_terseLabel_en-US" xlink:label="lab_srt_ConsolidationItemsDomain_E899ABA4B9622601A6AE7533656BACD3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Consolidation Items [Domain]</link:label>
    <link:label id="lab_srt_ConsolidationItemsDomain_E899ABA4B9622601A6AE7533656BACD3_label_en-US" xlink:label="lab_srt_ConsolidationItemsDomain_E899ABA4B9622601A6AE7533656BACD3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Consolidation Items [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ConsolidationItemsDomain" xlink:label="loc_srt_ConsolidationItemsDomain_E899ABA4B9622601A6AE7533656BACD3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_ConsolidationItemsDomain_E899ABA4B9622601A6AE7533656BACD3" xlink:to="lab_srt_ConsolidationItemsDomain_E899ABA4B9622601A6AE7533656BACD3" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingSegmentsMember_5648A5DFAC3436E00BD27533656BE2F8_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingSegmentsMember_5648A5DFAC3436E00BD27533656BE2F8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Operating Segments</link:label>
    <link:label id="lab_us-gaap_OperatingSegmentsMember_5648A5DFAC3436E00BD27533656BE2F8_label_en-US" xlink:label="lab_us-gaap_OperatingSegmentsMember_5648A5DFAC3436E00BD27533656BE2F8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Segments [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingSegmentsMember" xlink:label="loc_us-gaap_OperatingSegmentsMember_5648A5DFAC3436E00BD27533656BE2F8" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingSegmentsMember_5648A5DFAC3436E00BD27533656BE2F8" xlink:to="lab_us-gaap_OperatingSegmentsMember_5648A5DFAC3436E00BD27533656BE2F8" xlink:type="arc" />
    <link:label id="lab_us-gaap_StatementBusinessSegmentsAxis_3CFF1C3049FE283A48517533656BA532_terseLabel_en-US" xlink:label="lab_us-gaap_StatementBusinessSegmentsAxis_3CFF1C3049FE283A48517533656BA532" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Segments [Axis]</link:label>
    <link:label id="lab_us-gaap_StatementBusinessSegmentsAxis_3CFF1C3049FE283A48517533656BA532_label_en-US" xlink:label="lab_us-gaap_StatementBusinessSegmentsAxis_3CFF1C3049FE283A48517533656BA532" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Segments [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_3CFF1C3049FE283A48517533656BA532" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_3CFF1C3049FE283A48517533656BA532" xlink:to="lab_us-gaap_StatementBusinessSegmentsAxis_3CFF1C3049FE283A48517533656BA532" xlink:type="arc" />
    <link:label id="lab_us-gaap_SegmentDomain_5BFFC0E0CD7CBA482BC27533656BAE49_terseLabel_en-US" xlink:label="lab_us-gaap_SegmentDomain_5BFFC0E0CD7CBA482BC27533656BAE49" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Segments [Domain]</link:label>
    <link:label id="lab_us-gaap_SegmentDomain_5BFFC0E0CD7CBA482BC27533656BAE49_label_en-US" xlink:label="lab_us-gaap_SegmentDomain_5BFFC0E0CD7CBA482BC27533656BAE49" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Segments [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_5BFFC0E0CD7CBA482BC27533656BAE49" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SegmentDomain_5BFFC0E0CD7CBA482BC27533656BAE49" xlink:to="lab_us-gaap_SegmentDomain_5BFFC0E0CD7CBA482BC27533656BAE49" xlink:type="arc" />
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    <link:label id="lab_cdw_AccountsPayableInventoryFinancingMember_2DCC99712087C1C0238E748B9BBDA5E7_documentation_en-US" xlink:label="lab_cdw_AccountsPayableInventoryFinancingMember_2DCC99712087C1C0238E748B9BBDA5E7" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Accounts Payable, Inventory Financing [Member]</link:label>
    <link:loc xlink:href="cdw-20200331.xsd#cdw_AccountsPayableInventoryFinancingMember" xlink:label="loc_cdw_AccountsPayableInventoryFinancingMember_2DCC99712087C1C0238E748B9BBDA5E7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cdw_AccountsPayableInventoryFinancingMember_2DCC99712087C1C0238E748B9BBDA5E7" xlink:to="lab_cdw_AccountsPayableInventoryFinancingMember_2DCC99712087C1C0238E748B9BBDA5E7" xlink:type="arc" />
    <link:label id="lab_cdw_CDWUKRevolvingCreditFacilityMember_BB7A9EE84B6AD65E122C748B9BBE904D_terseLabel_en-US" xlink:label="lab_cdw_CDWUKRevolvingCreditFacilityMember_BB7A9EE84B6AD65E122C748B9BBE904D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">CDW UK revolving credit facility</link:label>
    <link:label id="lab_cdw_CDWUKRevolvingCreditFacilityMember_BB7A9EE84B6AD65E122C748B9BBE904D_label_en-US" xlink:label="lab_cdw_CDWUKRevolvingCreditFacilityMember_BB7A9EE84B6AD65E122C748B9BBE904D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">CDW UK Revolving Credit Facility [Member]</link:label>
    <link:label id="lab_cdw_CDWUKRevolvingCreditFacilityMember_BB7A9EE84B6AD65E122C748B9BBE904D_documentation_en-US" xlink:label="lab_cdw_CDWUKRevolvingCreditFacilityMember_BB7A9EE84B6AD65E122C748B9BBE904D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">CDW UK Revolving Credit Facility [Member]</link:label>
    <link:loc xlink:href="cdw-20200331.xsd#cdw_CDWUKRevolvingCreditFacilityMember" xlink:label="loc_cdw_CDWUKRevolvingCreditFacilityMember_BB7A9EE84B6AD65E122C748B9BBE904D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cdw_CDWUKRevolvingCreditFacilityMember_BB7A9EE84B6AD65E122C748B9BBE904D" xlink:to="lab_cdw_CDWUKRevolvingCreditFacilityMember_BB7A9EE84B6AD65E122C748B9BBE904D" xlink:type="arc" />
    <link:label id="lab_cdw_SeniorSecuredAssetBasedRevolvingCreditFacilityMember_F1B779262576C8DAC57B748B9BBE3FB3_terseLabel_en-US" xlink:label="lab_cdw_SeniorSecuredAssetBasedRevolvingCreditFacilityMember_F1B779262576C8DAC57B748B9BBE3FB3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Senior secured asset-based revolving credit facility</link:label>
    <link:label id="lab_cdw_SeniorSecuredAssetBasedRevolvingCreditFacilityMember_F1B779262576C8DAC57B748B9BBE3FB3_label_en-US" xlink:label="lab_cdw_SeniorSecuredAssetBasedRevolvingCreditFacilityMember_F1B779262576C8DAC57B748B9BBE3FB3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Senior Secured Asset-Based Revolving Credit Facility [Member]</link:label>
    <link:label id="lab_cdw_SeniorSecuredAssetBasedRevolvingCreditFacilityMember_F1B779262576C8DAC57B748B9BBE3FB3_documentation_en-US" xlink:label="lab_cdw_SeniorSecuredAssetBasedRevolvingCreditFacilityMember_F1B779262576C8DAC57B748B9BBE3FB3" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Senior Secured Asset-Based Revolving Credit Facility [Member]</link:label>
    <link:loc xlink:href="cdw-20200331.xsd#cdw_SeniorSecuredAssetBasedRevolvingCreditFacilityMember" xlink:label="loc_cdw_SeniorSecuredAssetBasedRevolvingCreditFacilityMember_F1B779262576C8DAC57B748B9BBE3FB3" xlink:type="locator" />
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    <link:label id="lab_cdw_CDWUKTermLoanMember_3BE844BDC1019A0C9C87748B9BBE3A9E_terseLabel_en-US" xlink:label="lab_cdw_CDWUKTermLoanMember_3BE844BDC1019A0C9C87748B9BBE3A9E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">CDW UK term loan</link:label>
    <link:label id="lab_cdw_CDWUKTermLoanMember_3BE844BDC1019A0C9C87748B9BBE3A9E_label_en-US" xlink:label="lab_cdw_CDWUKTermLoanMember_3BE844BDC1019A0C9C87748B9BBE3A9E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">CDW UK Term Loan [Member]</link:label>
    <link:label id="lab_cdw_CDWUKTermLoanMember_3BE844BDC1019A0C9C87748B9BBE3A9E_documentation_en-US" xlink:label="lab_cdw_CDWUKTermLoanMember_3BE844BDC1019A0C9C87748B9BBE3A9E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">CDW UK Term Loan [Member]</link:label>
    <link:loc xlink:href="cdw-20200331.xsd#cdw_CDWUKTermLoanMember" xlink:label="loc_cdw_CDWUKTermLoanMember_3BE844BDC1019A0C9C87748B9BBE3A9E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cdw_CDWUKTermLoanMember_3BE844BDC1019A0C9C87748B9BBE3A9E" xlink:to="lab_cdw_CDWUKTermLoanMember_3BE844BDC1019A0C9C87748B9BBE3A9E" xlink:type="arc" />
    <link:label id="lab_cdw_SeniorSecuredTermLoanFacilityMember_A13FA2B70BD986AEBD48748B9BBED006_terseLabel_en-US" xlink:label="lab_cdw_SeniorSecuredTermLoanFacilityMember_A13FA2B70BD986AEBD48748B9BBED006" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Senior secured term loan facility</link:label>
    <link:label id="lab_cdw_SeniorSecuredTermLoanFacilityMember_A13FA2B70BD986AEBD48748B9BBED006_label_en-US" xlink:label="lab_cdw_SeniorSecuredTermLoanFacilityMember_A13FA2B70BD986AEBD48748B9BBED006" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Senior Secured Term Loan Facility [Member]</link:label>
    <link:label id="lab_cdw_SeniorSecuredTermLoanFacilityMember_A13FA2B70BD986AEBD48748B9BBED006_documentation_en-US" xlink:label="lab_cdw_SeniorSecuredTermLoanFacilityMember_A13FA2B70BD986AEBD48748B9BBED006" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Senior Secured Term Loan Facility [Member]</link:label>
    <link:loc xlink:href="cdw-20200331.xsd#cdw_SeniorSecuredTermLoanFacilityMember" xlink:label="loc_cdw_SeniorSecuredTermLoanFacilityMember_A13FA2B70BD986AEBD48748B9BBED006" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DebtInstrumentLineItems_7F7CD30470399D284403748B9BBF8689_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentLineItems_7F7CD30470399D284403748B9BBF8689" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Instrument [Line Items]</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentLineItems_7F7CD30470399D284403748B9BBF8689_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentLineItems_7F7CD30470399D284403748B9BBF8689" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_7F7CD30470399D284403748B9BBF8689" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7F7CD30470399D284403748B9BBF8689" xlink:to="lab_us-gaap_DebtInstrumentLineItems_7F7CD30470399D284403748B9BBF8689" xlink:type="arc" />
    <link:label id="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_8667D96FF52A5BA8BE93748B9BBFE647_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_8667D96FF52A5BA8BE93748B9BBFE647" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Borrowing capacity of the Revolving Loan</link:label>
    <link:label id="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_8667D96FF52A5BA8BE93748B9BBFE647_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_8667D96FF52A5BA8BE93748B9BBFE647" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Line of Credit Facility, Maximum Borrowing Capacity</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_8667D96FF52A5BA8BE93748B9BBFE647" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LettersOfCreditOutstandingAmount_331AEE349BA1928B052C748B9BC0A262_terseLabel_en-US" xlink:label="lab_us-gaap_LettersOfCreditOutstandingAmount_331AEE349BA1928B052C748B9BC0A262" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Undrawn letters of credit</link:label>
    <link:label id="lab_us-gaap_LettersOfCreditOutstandingAmount_331AEE349BA1928B052C748B9BC0A262_label_en-US" xlink:label="lab_us-gaap_LettersOfCreditOutstandingAmount_331AEE349BA1928B052C748B9BC0A262" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Letters of Credit Outstanding, Amount</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LettersOfCreditOutstandingAmount" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_331AEE349BA1928B052C748B9BC0A262" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LettersOfCreditOutstandingAmount_331AEE349BA1928B052C748B9BC0A262" xlink:to="lab_us-gaap_LettersOfCreditOutstandingAmount_331AEE349BA1928B052C748B9BC0A262" xlink:type="arc" />
    <link:label id="lab_cdw_AmountOwedUnderRevolvingLoanFinancingAgreement_EB3F6034084DEB7065AC748B9BC00829_terseLabel_en-US" xlink:label="lab_cdw_AmountOwedUnderRevolvingLoanFinancingAgreement_EB3F6034084DEB7065AC748B9BC00829" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Amount owed under Revolving loan financing agreement</link:label>
    <link:label id="lab_cdw_AmountOwedUnderRevolvingLoanFinancingAgreement_EB3F6034084DEB7065AC748B9BC00829_label_en-US" xlink:label="lab_cdw_AmountOwedUnderRevolvingLoanFinancingAgreement_EB3F6034084DEB7065AC748B9BC00829" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Amount owed under Revolving loan financing agreement</link:label>
    <link:label id="lab_cdw_AmountOwedUnderRevolvingLoanFinancingAgreement_EB3F6034084DEB7065AC748B9BC00829_documentation_en-US" xlink:label="lab_cdw_AmountOwedUnderRevolvingLoanFinancingAgreement_EB3F6034084DEB7065AC748B9BC00829" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Amount owed under Revolving loan financing agreement</link:label>
    <link:loc xlink:href="cdw-20200331.xsd#cdw_AmountOwedUnderRevolvingLoanFinancingAgreement" xlink:label="loc_cdw_AmountOwedUnderRevolvingLoanFinancingAgreement_EB3F6034084DEB7065AC748B9BC00829" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cdw_AmountOwedUnderRevolvingLoanFinancingAgreement_EB3F6034084DEB7065AC748B9BC00829" xlink:to="lab_cdw_AmountOwedUnderRevolvingLoanFinancingAgreement_EB3F6034084DEB7065AC748B9BC00829" xlink:type="arc" />
    <link:label id="lab_cdw_LineOfCreditFacilityBorrowingBase_ADE101CCD113ECF0A98C748B9BC01F6D_terseLabel_en-US" xlink:label="lab_cdw_LineOfCreditFacilityBorrowingBase_ADE101CCD113ECF0A98C748B9BC01F6D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Borrowing base</link:label>
    <link:label id="lab_cdw_LineOfCreditFacilityBorrowingBase_ADE101CCD113ECF0A98C748B9BC01F6D_label_en-US" xlink:label="lab_cdw_LineOfCreditFacilityBorrowingBase_ADE101CCD113ECF0A98C748B9BC01F6D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Line of Credit Facility, Borrowing Base</link:label>
    <link:label id="lab_cdw_LineOfCreditFacilityBorrowingBase_ADE101CCD113ECF0A98C748B9BC01F6D_documentation_en-US" xlink:label="lab_cdw_LineOfCreditFacilityBorrowingBase_ADE101CCD113ECF0A98C748B9BC01F6D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Line of Credit Facility, Borrowing Base</link:label>
    <link:loc xlink:href="cdw-20200331.xsd#cdw_LineOfCreditFacilityBorrowingBase" xlink:label="loc_cdw_LineOfCreditFacilityBorrowingBase_ADE101CCD113ECF0A98C748B9BC01F6D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cdw_LineOfCreditFacilityBorrowingBase_ADE101CCD113ECF0A98C748B9BC01F6D" xlink:to="lab_cdw_LineOfCreditFacilityBorrowingBase_ADE101CCD113ECF0A98C748B9BC01F6D" xlink:type="arc" />
    <link:label id="lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_265C956E0E09C4289CD4748B9BC09FA8_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_265C956E0E09C4289CD4748B9BC09FA8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Additional borrowing capacity</link:label>
    <link:label id="lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_265C956E0E09C4289CD4748B9BC09FA8_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_265C956E0E09C4289CD4748B9BC09FA8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Line of Credit Facility, Remaining Borrowing Capacity</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_265C956E0E09C4289CD4748B9BC09FA8" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_265C956E0E09C4289CD4748B9BC09FA8" xlink:to="lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_265C956E0E09C4289CD4748B9BC09FA8" xlink:type="arc" />
    <link:label id="lab_us-gaap_RepaymentsOfDebt_D0F8D133956624E18D89748B9BC0A88D_terseLabel_en-US" xlink:label="lab_us-gaap_RepaymentsOfDebt_D0F8D133956624E18D89748B9BC0A88D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Annual principal repayment installments</link:label>
    <link:label id="lab_us-gaap_RepaymentsOfDebt_D0F8D133956624E18D89748B9BC0A88D_label_en-US" xlink:label="lab_us-gaap_RepaymentsOfDebt_D0F8D133956624E18D89748B9BC0A88D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Repayments of Debt</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RepaymentsOfDebt" xlink:label="loc_us-gaap_RepaymentsOfDebt_D0F8D133956624E18D89748B9BC0A88D" xlink:type="locator" />
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    <link:label id="lab_us-gaap_AmountOfRestrictedNetAssetsForConsolidatedAndUnconsolidatedSubsidiaries_85735643F5167BF4523C748B9BC0CC41_terseLabel_en-US" xlink:label="lab_us-gaap_AmountOfRestrictedNetAssetsForConsolidatedAndUnconsolidatedSubsidiaries_85735643F5167BF4523C748B9BC0CC41" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Amount of restricted payment capacity under the loan</link:label>
    <link:label id="lab_us-gaap_AmountOfRestrictedNetAssetsForConsolidatedAndUnconsolidatedSubsidiaries_85735643F5167BF4523C748B9BC0CC41_label_en-US" xlink:label="lab_us-gaap_AmountOfRestrictedNetAssetsForConsolidatedAndUnconsolidatedSubsidiaries_85735643F5167BF4523C748B9BC0CC41" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Amount of Restricted Net Assets for Consolidated and Unconsolidated Subsidiaries</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AmountOfRestrictedNetAssetsForConsolidatedAndUnconsolidatedSubsidiaries" xlink:label="loc_us-gaap_AmountOfRestrictedNetAssetsForConsolidatedAndUnconsolidatedSubsidiaries_85735643F5167BF4523C748B9BC0CC41" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AmountOfRestrictedNetAssetsForConsolidatedAndUnconsolidatedSubsidiaries_85735643F5167BF4523C748B9BC0CC41" xlink:to="lab_us-gaap_AmountOfRestrictedNetAssetsForConsolidatedAndUnconsolidatedSubsidiaries_85735643F5167BF4523C748B9BC0CC41" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentPeriodicPaymentPrincipal_DEA7325BC2A84767F4B0748B9BC032A6_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentPeriodicPaymentPrincipal_DEA7325BC2A84767F4B0748B9BC032A6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Periodic payment, principal</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInOtherOperatingAssets" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets_1A122838B19A81209D6FBD06FB15C52A" xlink:type="locator" />
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    <link:label id="lab_us-gaap_IncreaseDecreaseInAccountsPayableTrade_7AA3899202DC186552A4BD06FB154499_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccountsPayableTrade_7AA3899202DC186552A4BD06FB154499" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accounts payable-trade</link:label>
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    <link:label id="lab_us-gaap_IncreaseDecreaseInOtherOperatingLiabilities_863774C0DA59E9958DC1BD06FB1585FB_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOtherOperatingLiabilities_863774C0DA59E9958DC1BD06FB1585FB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other liabilities</link:label>
    <link:label id="lab_us-gaap_IncreaseDecreaseInOtherOperatingLiabilities_863774C0DA59E9958DC1BD06FB1585FB_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOtherOperatingLiabilities_863774C0DA59E9958DC1BD06FB1585FB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Other Operating Liabilities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInOtherOperatingLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingLiabilities_863774C0DA59E9958DC1BD06FB1585FB" xlink:type="locator" />
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_70B0B2A1A353A03CA2ADBD06FB155506_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_70B0B2A1A353A03CA2ADBD06FB155506" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Operating Activities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_70B0B2A1A353A03CA2ADBD06FB155506" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_70B0B2A1A353A03CA2ADBD06FB155506" xlink:to="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_70B0B2A1A353A03CA2ADBD06FB155506" xlink:type="arc" />
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_C774076086B86116F685BD06FB159265_terseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_C774076086B86116F685BD06FB159265" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash flows used in investing activities:</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_C774076086B86116F685BD06FB159265_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_C774076086B86116F685BD06FB159265" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Investing Activities [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_C774076086B86116F685BD06FB159265" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_62584C14F324E6400029BD06FB154A15_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_62584C14F324E6400029BD06FB154A15" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Capital expenditures</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_097D05BB83A2A48F1405BD06FB15D8B2" xlink:type="locator" />
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_641ADBB1B930A81E581ABD06FB15CED6_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_641ADBB1B930A81E581ABD06FB15CED6" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net cash used in investing activities</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_641ADBB1B930A81E581ABD06FB15CED6_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_641ADBB1B930A81E581ABD06FB15CED6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Investing Activities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_641ADBB1B930A81E581ABD06FB15CED6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_641ADBB1B930A81E581ABD06FB15CED6" xlink:to="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_641ADBB1B930A81E581ABD06FB15CED6" xlink:type="arc" />
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_FD39F5F1777DD842177EBD06FB154BA4_terseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_FD39F5F1777DD842177EBD06FB154BA4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash flows used in financing activities:</link:label>
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    <link:label id="lab_us-gaap_ProceedsFromLinesOfCredit_4015B1010A84E8BD582CBD06FB15B659_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromLinesOfCredit_4015B1010A84E8BD582CBD06FB15B659" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Proceeds from borrowings under revolving credit facility</link:label>
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    <link:label id="lab_cdw_NetChangeInAccountsPayableInventoryFinancing_65C16D183379DDBF153DBD06FB15E66E_terseLabel_en-US" xlink:label="lab_cdw_NetChangeInAccountsPayableInventoryFinancing_65C16D183379DDBF153DBD06FB15E66E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net change in accounts payable-inventory financing</link:label>
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