REVENUE (Tables)

6 Months Ended

Jun. 30, 2019

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue [Table Text Block]

The following tables disaggregate WESCO’s revenue by end market and geography:



	Three Months Ended				Six Months Ended
	June 30				June 30
(In thousands)	2019		2018		2019		2018
Industrial	$	761,934	$	760,741	$	1,498,825	$	1,519,723
Construction	704,183		683,752		1,337,483		1,321,551
Utility	346,941		336,961		655,213		652,506
Commercial, Institutional and Government	337,030		322,540		619,834		604,129
Total by end market	$	2,150,088	$	2,103,994	$	4,111,355	$	4,097,909



	Three Months Ended				Six Months Ended
	June 30				June 30
(In thousands)	2019		2018		2019		2018
United States	$	1,616,347	$	1,563,392	$	3,077,263	$	3,046,140
Canada ⁽¹⁾	415,030		405,981		799,700		804,689
Other International ⁽¹⁾	118,711		134,621		234,392		247,080
Total by geography	$	2,150,088	$	2,103,994	$	4,111,355	$	4,097,909

⁽¹⁾

The prior period has been reclassified to conform to the current period presentation.

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 June 30, 2019 and 2018 by approximately $28.5 million and $25.0 million, respectively, and by approximately $53.8 million and $49.4 million for the six months ended June 30, 2019 and 2018, respectively.