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REVENUE | 12 Months Ended
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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)
Government | 21 |  | % |  | 9 |  | % |  | 16 |  | %
Heavy Manufacturing | 16 |  | % |  | 18 |  | % |  | 15 |  | %
Light Manufacturing | 13 |  | % |  | 7 |  | % |  | 10 |  | %
Transportation | 5 |  | % |  | 10 |  | % |  | 5 |  | %
Healthcare | 10 |  | % |  | — |  | % |  | 7 |  | %
Commercial | 8 |  | % |  | 9 |  | % |  | 7 |  | %
Retail/Wholesale | 10 |  | % |  | 3 |  | % |  | 8 |  | %
Contractors | 9 |  | % |  | 10 |  | % |  | 7 |  | %
Natural Resources | 2 |  | % |  | 29 |  | % |  | 3 |  | %
Other (1) | 6 |  | % |  | 5 |  | % |  | 22 |  | %
Total net sales | 100 |  | % |  | 100 |  | % |  | 100 |  | %
Percent of Total Company Revenue | 73 |  | % |  | 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)
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 smaller international high-touch businesses and account for approximately 23% of revenue for the twelve months ended December 31, 2019.

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- Definition The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -URI http://asc.fasb.org/topic&trid=49130388 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130551-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130556-203045 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130550-203045 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130558-203045 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 + Details
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