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Inventory Financing Agreements (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Accounts Payable, Inventory Financing
Inventory Financing Agreements [Line Items]
Other inventory financing agreements	$ 331	$ 355

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- Definition

Inventory Financing Agreements [Line Items]

+ References

No definition available.

+ Details

Name:	cdw_InventoryFinancingAgreementsLineItems
Namespace Prefix:	cdw_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Other Inventory Financing Agreements

+ References

No definition available.

+ Details

Name:	cdw_OtherInventoryFinancingAgreements
Namespace Prefix:	cdw_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Details

Name:	cdw_InventoryFinancingAgreementsAxis=cdw_AccountsPayableInventoryFinancingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: