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REVENUE
 9 Months Ended
Sep. 30, 2021
Revenue from Contract with Customer [Abstract]  
REVENUE REVENUE
Company revenue is primarily comprised of MRO product sales and related activities, such as freight and services. Total service revenue is not material and accounted for approximately 1% of the Company's revenue for the three and nine months ended September 30, 2021 and 2020, respectively.

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 segment and 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. 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 whereas in the Endless Assortment segment, a majority of revenue is derived from customer spot buys. The following table presents the Company's percentage of revenue by reportable segment and by major customer industry:
Three Months Ended September 30,
20212020
High-Touch Solutions N.A.Endless Assortment
Total Company(2)
High-Touch Solutions N.A.Endless Assortment
Total Company(2)
Contractors9 %15 %10 %8 %15 %10 %
Commercial9 %15 %10 %9 %15 %10 %
Government18 %3 %15 %22 %3 %18 %
Healthcare7 %2 %6 %8 %2 %6 %
Manufacturing29 %30 %29 %27 %27 %28 %
Retail/Wholesale9 %10 %10 %9 %10 %9 %
Transportation5 %3 %5 %5 %3 %5 %
Others(1)
14 %22 %15 %12 %25 %14 %
Total100 %100 %100 %100 %100 %100 %
Percent of Total Company Revenue79 %19 %100 %79 %19 %100 %

(1) Others 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 in the U.K., as well as the China business in the period prior to its divestiture in the third quarter of 2020. Other businesses account for approximately 2% of revenue for the three months ended September 30, 2021 and September 30, 2020.
Nine Months Ended September 30,
20212020
High-Touch Solutions N.A.Endless Assortment
Total Company(2)
High-Touch Solutions N.A.Endless Assortment
Total Company(2)
Contractors9 %15 %10 %9 %15 %10 %
Commercial9 %15 %10 %9 %15 %9 %
Government19 %3 %15 %20 %3 %16 %
Healthcare7 %2 %6 %9 %2 %7 %
Manufacturing30 %29 %29 %28 %29 %29 %
Retail/Wholesale9 %10 %10 %9 %10 %9 %
Transportation5 %3 %5 %5 %3 %5 %
Others(1)
12 %23 %15 %11 %23 %15 %
Total100 %100 %100 %100 %100 %100 %
Percent of Total Company Revenue78 %20 %100 %78 %18 %100 %

(1) Others 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 in the U.K., as well as the Fabory and China businesses in the period prior to their divestitures in the second and third quarter of 2020, respectively. Other businesses account for approximately 2% and 4% of revenue for the nine months ended September 30, 2021 and September 30, 2020.

Total accrued sales returns were approximately $41 million and $31 million as of September 30, 2021 and December 31, 2020, respectively and are reported as a reduction of Accounts receivable, net. Total accrued sales incentives were approximately $65 million and $58 million as of September 30, 2021 and December 31, 2020 and are reported as part of Accrued expenses. The Company had no material unsatisfied performance obligations, contract assets or liabilities as of September 30, 2021 and December 31, 2020.