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Long-Term Debt - Revolving Loan (Details) £ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 USD ($) | Mar. 31, 2017 USD ($) | Mar. 31, 2018 GBP (£) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
Carrying value |  |  |  | $ 3,255,000,000 | $ 3,255,900,000
Net loss on extinguishments of long-term debt | $ 0 | $ 57,400,000 |  |  |
CDW UK term loan |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Carrying value |  |  | £ 56 | 78,500,000 | 75,700,000
Deferred finance costs, net and unamortized premium |  |  | £ 1 | 1,000,000 |
Senior secured asset-based revolving credit facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Carrying value |  |  |  | 0 | $ 0
Undrawn letters of credit |  |  |  | 1,000,000 |
Borrowing base |  |  |  | 1,600,000,000 |
Additional borrowing capacity |  |  |  | 987,000,000 |
Cash availability, minimum liquidity |  |  |  | $ 125,000,000 |
Cash availability, percentage of borrowing base |  |  | 10.00% | 10.00% |
Minimum liquidity, amount |  |  |  | $ 100,000,000 |
Basis spread on variable rate (as percent) | 1.00% |  |  |  |
Net loss on extinguishments of long-term debt |  | 1,000,000 |  |  |
Deferred finance costs, net and unamortized premium |  | $ 4,000,000 |  |  |
Minimum | Senior secured asset-based revolving credit facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Consolidated fixed charge coverage ratio |  |  | 1.00 | 1.00 |
Federal Funds Effective Swap Rate | Senior secured asset-based revolving credit facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate (as percent) | 0.50% |  |  |  |
London Interbank Offered Rate (LIBOR) | Minimum | Senior secured asset-based revolving credit facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate (as percent) | 1.25% |  |  |  |
London Interbank Offered Rate (LIBOR) | Maximum | Senior secured asset-based revolving credit facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate (as percent) | 1.75% |  |  |  |
Base Rate | Minimum | Senior secured asset-based revolving credit facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate (as percent) | 0.25% |  |  |  |
Base Rate | Maximum | Senior secured asset-based revolving credit facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate (as percent) | 0.75% |  |  |  |
Accounts Payable, Inventory Financing | Senior secured asset-based revolving credit facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Amount owed under Revolving loan financing agreement |  |  |  | $ 462,000,000 |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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