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REVENUE Variable Consideration (Details) | 9 Months Ended
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Sep. 30, 2018
Revenue from Contract with Customer [Abstract] |
Revenue Recognition, Revenue Reductions [Policy Text Block] | WESCO’s revenues are adjusted for variable consideration, which includes customer volume rebates, returns, and discounts. WESCO measures variable consideration by estimating expected outcomes using analysis and inputs based upon anticipated performance, historical data, as well as current and forecasted information. Measurement and recognition of variable consideration is reviewed by management on a monthly basis and revenue is adjusted accordingly. Variable consideration reduced revenue for the three months ended September 30, 2018 and 2017 by approximately $25.1 million and $24.2 million, respectively, and by approximately $74.5 million and $66.5 million for the nine months ended September 30, 2018 and 2017, respectively.

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- Definition Disclosure of accounting policy of sales arrangements for goods or services that reduce the amount of revenue recognized for example sales returns, allowances, incentives, rebates, discounts and loyalty programs. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790 + Details
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