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REVENUE (Tables)
 6 Months Ended
Jun. 30, 2021
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue [Table Text Block]
The following tables disaggregate WESCO’s net sales by segment and geography for the periods presented:
Three Months EndedSix Months Ended
 June 30June 30
(In thousands)2021202020212020
EES$1,923,011 $1,043,294 $3,643,824 $2,157,766 
CSS1,461,120 341,470 2,711,735 565,185 
UBS1,211,659 701,942 2,281,708 1,332,402 
Total by segment$4,595,790 $2,086,706 $8,637,267 $4,055,353 
Three Months EndedSix Months Ended
 June 30June 30
(In thousands)2021202020212020
United States$3,318,311 $1,587,063 $6,248,747 $3,065,557 
Canada 703,135 352,719 1,310,887 730,134 
Other International(1)
574,344 146,924 1,077,633 259,662 
Total by geography(2)
$4,595,790 $2,086,706 $8,637,267 $4,055,353