    <SEC-DOCUMENT>0001402057-20-000154-index.html : 20201102
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    <ACCEPTANCE-DATETIME>20201102072636
    ACCESSION NUMBER:		0001402057-20-000154
    CONFORMED SUBMISSION TYPE:	8-K
    PUBLIC DOCUMENT COUNT:		17
    CONFORMED PERIOD OF REPORT:	20201102
    ITEM INFORMATION:		Results of Operations and Financial Condition
    ITEM INFORMATION:		Other Events
    ITEM INFORMATION:		Financial Statements and Exhibits
    FILED AS OF DATE:		20201102
    DATE AS OF CHANGE:		20201102

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			CDW Corp
    		CENTRAL INDEX KEY:			0001402057
    		STANDARD INDUSTRIAL CLASSIFICATION:	RETAIL-CATALOG & MAIL-ORDER HOUSES [5961]
    		IRS NUMBER:				260273989
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		8-K
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-35985
    		FILM NUMBER:		201278979

    	BUSINESS ADDRESS:
    		STREET 1:		200 N MILWAUKEE AVENUE
    		CITY:			VERNON HILLS
    		STATE:			IL
    		ZIP:			60061
    		BUSINESS PHONE:		847-465-6000

    	MAIL ADDRESS:
    		STREET 1:		200 N MILWAUKEE AVENUE
    		CITY:			VERNON HILLS
    		STATE:			IL
    		ZIP:			60061

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	VH Holdings, Inc.
    		DATE OF NAME CHANGE:	20070605
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>8-K
    <SEQUENCE>1
    <FILENAME>cdw-20201102.htm
    <DESCRIPTION>8-K
    <TEXT>
    Document 1 - file: cdw-20201102.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.1
    <SEQUENCE>2
    <FILENAME>cdw-2020930earningsrel.htm
    <DESCRIPTION>EARNINGS RELEASE
    <TEXT>
    Document 2 - file: cdw-2020930earningsrel.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.2
    <SEQUENCE>3
    <FILENAME>cdw-2020930dividendrel.htm
    <DESCRIPTION>DIVIDEND RELEASE
    <TEXT>
    Document 3 - file: cdw-2020930dividendrel.htm

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    <TYPE>EX-101.SCH
    <SEQUENCE>4
    <FILENAME>cdw-20201102.xsd
    <DESCRIPTION>XBRL TAXONOMY EXTENSION SCHEMA DOCUMENT
    <TEXT>
    Document 4 - file: cdw-20201102.xsd

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    <SEQUENCE>5
    <FILENAME>cdw-20201102_cal.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION CALCULATION LINKBASE DOCUMENT
    <TEXT>
    Document 5 - file: cdw-20201102_cal.xml

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    <TYPE>EX-101.DEF
    <SEQUENCE>6
    <FILENAME>cdw-20201102_def.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION DEFINITION LINKBASE DOCUMENT
    <TEXT>
    Document 6 - file: cdw-20201102_def.xml

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    <TYPE>EX-101.LAB
    <SEQUENCE>7
    <FILENAME>cdw-20201102_lab.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION LABEL LINKBASE DOCUMENT
    <TEXT>
    Document 7 - file: cdw-20201102_lab.xml

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    <TYPE>EX-101.PRE
    <SEQUENCE>8
    <FILENAME>cdw-20201102_pre.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE DOCUMENT
    <TEXT>
    Document 8 - file: cdw-20201102_pre.xml

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>9
    <FILENAME>cdwlogo1.jpg
    <TEXT>
    Document 9 - file: cdwlogo1.jpg

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    <TYPE>XML
    <SEQUENCE>10
    <FILENAME>cdw-20201102_htm.xml
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
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    Document 10 - RAW XML: cdw-20201102_htm.xml

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    <TYPE>XML
    <SEQUENCE>11
    <FILENAME>R1.htm
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 11 - file: R1.htm

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    <DOCUMENT>
    <TYPE>EXCEL
    <SEQUENCE>12
    <FILENAME>Financial_Report.xlsx
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 12 - file: Financial_Report.xlsx

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    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>13
    <FILENAME>Show.js
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 13 - file: Show.js

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    <TYPE>XML
    <SEQUENCE>14
    <FILENAME>report.css
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 14 - file: report.css

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    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>15
    <FILENAME>FilingSummary.xml
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 15 - file: FilingSummary.html

    Document 15 - RAW XML: FilingSummary.xml

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    <DOCUMENT>
    <TYPE>JSON
    <SEQUENCE>18
    <FILENAME>MetaLinks.json
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 18 - file: MetaLinks.json

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    <DOCUMENT>
    <TYPE>ZIP
    <SEQUENCE>19
    <FILENAME>0001402057-20-000154-xbrl.zip
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 19 - file: 0001402057-20-000154-xbrl.zip

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