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Long-Term Debt - Narrative (Details) £ in Millions, $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2019 GBP (£) | Mar. 31, 2019 USD ($) | Mar. 31, 2019 USD ($) | Feb. 28, 2019 USD ($)
Senior secured term loan facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Amount of restricted payment capacity under the loan |  |  | $ 1,500 |
Periodic payment, principal |  | $ 4 |  |
CDW UK term loan |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Annual principal repayment installments | £ 5 | $ 7 |  |
Amount of restricted payment capacity under the loan | 124 |  | 162 |
CDW UK revolving credit facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Borrowing capacity of the Revolving Loan | £ 50 |  | 65 |
Senior secured asset-based revolving credit facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Undrawn letters of credit |  |  | 1 |
Borrowing base |  |  |  | $ 1,800
Additional borrowing capacity |  |  | 938 |
Accounts Payable, Inventory Financing | Senior secured asset-based revolving credit facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Amount owed under Revolving loan financing agreement |  |  | $ 436 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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=26873400&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=6877327&loc=d3e13212-122682 + Details
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