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Debt - Narrative (Details) - USD ($) $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020
Senior secured asset-based revolving credit facility |  |  |
Debt Instrument [Line Items] |  |  |
Undrawn letters of credit | $ 1 |  |
Borrowing base | 2,700 |  |
Additional borrowing capacity | 1,200 |  |
Senior secured term loan facility |  |  |
Debt Instrument [Line Items] |  |  |
Periodic payment, principal | 4 |  |
Amount of restricted payment capacity under the loan | 2,600 |  |
Revolving Loan |  |  |
Debt Instrument [Line Items] |  |  |
Borrowing capacity of the Revolving Loan |  | $ 1,600 | $ 1,450
CDW UK revolving credit facility |  |  |
Debt Instrument [Line Items] |  |  |
Borrowing capacity of the Revolving Loan | 150 |  |
Accounts Payable, Inventory Financing | Senior secured asset-based revolving credit facility |  |  |
Debt Instrument [Line Items] |  |  |
Amount owed under Revolving loan financing agreement | $ 280 |  |

X
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- Definition Amount of restricted net assets of consolidated and unconsolidated subsidiaries as of the end of the most recently completed fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(e)(3)(ii)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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