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REVENUE
 12 Months Ended
Dec. 31, 2019
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, 2019
 
U.S.
 
Canada
 
Total Company (2)
Government
18
%
 
6
%
 
14
%
Heavy Manufacturing
19
%
 
20
%
 
17
%
Light Manufacturing
12
%
 
6
%
 
10
%
Transportation
6
%
 
8
%
 
5
%
Healthcare
7
%
 
—
%
 
6
%
Commercial
10
%
 
9
%
 
8
%
Retail/Wholesale
9
%
 
4
%
 
7
%
Contractors
10
%
 
10
%
 
8
%
Natural Resources
3
%
 
33
%
 
4
%
Other (1)
6
%
 
4
%
 
21
%
Total net sales
100
%
 
100
%
 
100
%
Percent of Total Company Revenue
72
%
 
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 operations in Europe and Mexico and account for approximately 23% of revenue for the twelve months ended December 31, 2019.
 
Twelve Months Ended December 31, 2018
 
U.S.
 
Canada
 
Total Company (2)
Government
18
%
 
6
%
 
14
%
Heavy Manufacturing
19
%
 
20
%
 
18
%
Light Manufacturing
13
%
 
6
%
 
11
%
Transportation
6
%
 
7
%
 
5
%
Healthcare
7
%
 
—
%
 
5
%
Commercial
9
%
 
10
%
 
8
%
Retail/Wholesale
8
%
 
4
%
 
7
%
Contractors
10
%
 
11
%
 
8
%
Natural Resources
3
%
 
32
%
 
4
%
Other (1)
7
%
 
4
%
 
20
%
Total net sales
100
%
 
100
%
 
100
%
Percent of Total Company Revenue
72
%
 
6
%
 
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 operations in Europe and Mexico and account for approximately 22% of revenue for the twelve months ended December 31, 2018.