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Long-Term Debt - Narrative (Details)	6 Months Ended
	Jun. 30, 2020 GBP (£)	Jun. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Apr. 21, 2020 USD ($)	Dec. 31, 2019
CDW UK revolving credit facility
Debt Instrument [Line Items]
Borrowing capacity of the Revolving Loan	£ 50,000,000		$ 62,000,000
Interest rate in effect	0.00%		0.00%		0.00%
Senior secured asset-based revolving credit facility
Debt Instrument [Line Items]
Undrawn letters of credit			$ 1,000,000
Borrowing base			2,200,000,000
Additional borrowing capacity			$ 1,000,000,000.0
Interest rate in effect	1.438%		1.438%		5.00%
CDW UK term loan
Debt Instrument [Line Items]
Annual principal repayment installments	£ 5,000,000	$ 6,000,000
Amount of restricted payment capacity under the loan	£ 160,000,000		$ 198,000,000
Interest rate in effect	1.622%		1.622%		2.19%
Senior secured term loan facility
Debt Instrument [Line Items]
Amount of restricted payment capacity under the loan			$ 2,000,000,000.0
Periodic payment, principal		$ 4,000,000
Interest rate in effect	1.93%		1.93%		3.55%
Accounts Payable, Inventory Financing | Senior secured asset-based revolving credit facility
Debt Instrument [Line Items]
Amount owed under Revolving loan financing agreement			$ 432,000,000
Senior notes due 2025 | Unsecured senior debt
Debt Instrument [Line Items]
Debt instrument, aggregate principal amount				$ 600,000,000
Interest rate in effect				4.125%

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