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REVENUE
 12 Months Ended
Dec. 31, 2021
REVENUE [Abstract]  
REVENUE REVENUE
Grainger serves a large number of customers in diverse industries, which are subject to different economic and market specific factors. Revenue is primarily comprised of MRO product sales and related activities, such as freight and services. The Company's presentation of revenue by reportable segment and industry most reasonably depicts how the nature, amount, timing and uncertainty of the Company's revenue and cash flows are affected by economic and market-specific factors. In addition, the segments have unique underlying risks associated with customer purchasing behaviors. In the High-Touch Solutions N.A. segment, more than two-thirds of revenue is derived from customer contracts and in the Endless Assortment segment, a majority of revenue is derived from spot buys.

The following table presents the Company's percentage of revenue by reportable segment and by major customer industry:
 Twelve Months Ended December 31,
202120202019
 High-Touch Solutions N.A. Endless Assortment 
Total Company (2)
High-Touch Solutions N.A.Endless Assortment
Total Company (2)
High-Touch Solutions N.A.Endless Assortment
Total Company (2)
Contractors9 %16 %10 %9 %15 %10 %10 %16 %10 %
Commercial9 15 10 8 15 9 10 15 11 
Government18 3 15 20 3 16 17 3 14 
Healthcare7 2 6 9 2 7 7 1 6 
Manufacturing30 29 30 29 29 30 31 31 31 
Retail/Wholesale10 10 10 9 10 9 8 10 8 
Transportation5 3 5 5 3 5 6 3 5 
Other (1)
12 22 14 11 23 14 11 21 15 
Total net sales100 % 100 % 100 %100 %100 %100 %100 %100 %100 %
Percent of Total Company Revenue78 %20 %100 %78 %18 %100 %79 %16 %100 %
(1) Other primarily includes revenue from industries and customers that are not material individually, including agriculture, mining, natural resources and resellers not aligned to a major industry segment.
(2) Total Company includes other businesses, which includes the Cromwell business, as well as the Fabory and China businesses in the periods prior to their divestitures in the second and third quarter of 2020, respectively. Other businesses account for approximately 2%, 4% and 5% of revenue for the twelve months ended December 31, 2021, 2020 and 2019, respectively.