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Long-Term Debt - Narrative (Details) |  | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Aug. 13, 2020 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2020 GBP (£) | Sep. 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 | $ 65,000,000 |  |
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 |  |  |  | 2,400,000,000 |  |
Additional borrowing capacity |  |  |  | $ 856,000,000 |  |
Interest rate in effect |  |  | 0.00% | 0.00% |  | 5.00%
CDW UK term loan |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Amount of restricted payment capacity under the loan |  |  | £ 173,000,000 | $ 223,000,000 |  |
Interest rate in effect |  |  | 1.464% | 1.464% |  | 2.19%
Senior secured term loan facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Amount of restricted payment capacity under the loan |  |  |  | $ 2,100,000,000 |  |
Periodic payment, principal |  | $ 4,000,000 |  |  |  |
Interest rate in effect |  |  | 1.90% | 1.90% |  | 3.55%
Senior notes due 2025 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate in effect |  |  | 0.00% | 0.00% |  |
Interest rate, stated percentage | 5.00% |  |  |  |  |
Percentage of principal amount redeemed | 103.75% |  |  |  |  |
Accounts Payable, Inventory Financing | Senior secured asset-based revolving credit facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Amount owed under Revolving loan financing agreement |  |  |  | $ 594,000,000 |  |
Senior notes due 2025 | Unsecured senior debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, aggregate principal amount |  |  |  |  | $ 600,000,000 |
Interest rate, stated percentage |  |  |  |  | 4.125% |
Senior Notes due 2029 | Unsecured senior debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, aggregate principal amount | $ 700,000,000 |  |  |  |  |
Interest rate, stated percentage | 3.25% |  |  |  |  |

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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=120395691&loc=d3e23780-122690 + Details
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