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REVENUE Revenue Reductions (Policies) | 12 Months Ended
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Dec. 31, 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 historical data, as well as current and forecasted information. Variable consideration is reviewed by management on a monthly basis and revenue is adjusted accordingly. Variable consideration reduced revenue for the years ended December 31, 2018, 2017 and 2016 by approximately $107.4 million, $91.1 million and $79.9 million, 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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