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REVENUE (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | [1] | $ 18,217,512 | $ 12,325,995 | $ 8,358,917
Selling, general and administrative expense |  | 2,791,641 | 1,859,028 | 1,173,137
Contract with Customer, Asset, before Allowance for Credit Loss |  | 33,400 | 19,400 |
Deferred Revenue |  | 35,500 | 24,300 |
EES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales |  | 7,621,263 | 5,479,760 | 4,860,541
CSS |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales |  | 5,715,238 | 3,323,264 | 909,496
UBS |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales |  | 4,881,011 | 3,522,971 | 2,588,880
UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales |  | 13,157,866 | 9,110,453 | 6,234,119
Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales |  | 2,747,187 | 1,892,321 | 1,647,066
Other International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net sales | [2] | 2,312,459 | 1,323,221 | 477,732
Shipping and Handling [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Selling, general and administrative expense |  | $ 248,300 | $ 149,300 | $ 71,700
[1] | (2) Wesco attributes revenues from external customers to individual countries on the basis of point of sale.
[2] | (1) No individual country's net sales are greater than 10% of total net sales.

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