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Inventory Financing Agreements (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
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Inventory Financing Agreements [Abstract] |  |
Accounts payable-inventory financing | $ 357.0 | $ 430.9

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- Definition Accounts payable, inventory financing. + References No definition available. + Details
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Namespace Prefix: | cdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Inventory Financing Agreements [Abstract] + References No definition available. + Details
Name: | cdw_InventoryFinancingAgreementsAbstract
Namespace Prefix: | cdw_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration