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Inventory Financing Agreements (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
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

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

X

- 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