REVENUE (Tables)

9 Months Ended

Sep. 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				Nine Months Ended
	September 30				September 30
(In thousands)	2019		2018		2019		2018
Industrial	$	755,129	$	723,869	$	2,253,974	$	2,243,590
Construction	714,589		686,165		2,052,061		2,007,708
Utility	357,527		345,937		1,012,726		998,438
Commercial, Institutional and Government	320,865		311,274		940,704		915,418
Total by end market	$	2,148,110	$	2,067,245	$	6,259,465	$	6,165,154



	Three Months Ended				Nine Months Ended
	September 30				September 30
(In thousands)	2019		2018		2019		2018
United States	$	1,601,962	$	1,525,393	$	4,679,251	$	4,571,533
Canada ⁽¹⁾	431,233		429,830		1,230,855		1,234,600
Other International ⁽¹⁾	114,915		112,022		349,359		359,021
Total by geography	$	2,148,110	$	2,067,245	$	6,259,465	$	6,165,154

⁽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 September 30, 2019 and 2018 by approximately $26.3 million and $25.1 million, respectively, and by approximately $80.1 million and $74.5 million for the nine months ended September 30, 2019 and 2018, respectively.