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REVENUE
 12 Months Ended
Dec. 31, 2020
REVENUE [Abstract]  
REVENUE REVENUE
Company revenue is primarily comprised of MRO product sales and related activities, such as freight and services.

Grainger serves a large number of customers in diverse industries, which are subject to different economic and market specific factors. The Company's presentation of revenue by industry most reasonably depicts how the nature, amount, timing and uncertainty of Company revenue and cash flows are affected by economic and market specific factors. The following table presents the Company's percentage of revenue by reportable segment and by major customer industry:
 Twelve Months Ended December 31, 2020
 United States Canada 
Total Company (2)
Government21 % 9 % 16 %
Heavy Manufacturing16 % 18 % 15 %
Light Manufacturing13 % 7 % 10 %
Transportation5 % 10 % 5 %
Healthcare10 %— %7 %
Commercial8 % 9 % 7 %
Retail/Wholesale10 % 3 % 8 %
Contractors9 % 10 % 7 %
Natural Resources2 % 29 % 3 %
Other (1)
6 % 5 % 22 %
Total net sales100 % 100 % 100 %
Percent of Total Company Revenue73 % 4 % 100 %
(1) Other category primarily includes revenue from individual customers not aligned to major industry segment, including small businesses and consumers, and intersegment net sales.
(2) Total Company includes other businesses, which include the Company's endless assortment businesses and smaller international high-touch businesses and account for approximately 23% of revenue for the twelve months ended December 31, 2020.
 Twelve Months Ended December 31, 2019
 United States Canada 
Total Company (2)
Government18 %6 %14 %
Heavy Manufacturing19 %20 %17 %
Light Manufacturing12 %6 %10 %
Transportation6 %8 %5 %
Healthcare7 %— %6 %
Commercial10 %9 %8 %
Retail/Wholesale9 %4 %7 %
Contractors10 %10 %8 %
Natural Resources3 %33 %4 %
Other (1)
6 %4 %21 %
Total net sales100 % 100 % 100 %
Percent of Total Company Revenue72 % 5 % 100 %
(1) Other category primarily includes revenue from individual customers not aligned to major industry segment, including small businesses and consumers, and intersegment net sales.
(2) Total Company includes other businesses, which include the Company's endless assortment businesses and smaller international high-touch businesses and account for approximately 23% of revenue for the twelve months ended December 31, 2019.