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BACKGROUND AND BASIS OF PRESENTATION	9 Months Ended
BACKGROUND AND BASIS OF PRESENTATION	Sep. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
BACKGROUND AND BASIS OF PRESENTATION	BACKGROUND AND BASIS OF PRESENTATION W.W. Grainger, Inc. is a broad line, business-to-business distributor of maintenance, repair and operating (MRO) products and services with operations primarily in North America (N.A.), Japan and the United Kingdom (U.K.). In this report, the words “Company” or “Grainger” mean W.W. Grainger, Inc. and its subsidiaries, except where the context makes it clear that the reference is only to W.W. Grainger, Inc. itself and not its subsidiaries. The Company's Condensed Consolidated Financial Statements (Financial Statements) and the related notes are unaudited and should be read in conjunction with the consolidated financial statements and associated notes for the year ended December 31, 2020 included in the Company’s Annual Report on Form 10-K filed with the Securities and Exchange Commission (SEC) on February 24, 2021 (2020 Form 10-K). The Condensed Consolidated Balance Sheet as of December 31, 2020 has been derived from the audited consolidated financial statements at that date but does not include all of the disclosures required by accounting principles generally accepted in the United States of America (U.S.) for complete financial statements. The unaudited financial information reflects all adjustments (primarily consisting of normal recurring adjustments) which, in the opinion of management, are necessary for a fair presentation of the statements contained in this report. Changes to Reportable Segments Effective January 1, 2021, Grainger's two reportable segments are High-Touch Solutions N.A. and Endless Assortment. On March 8, 2021, the Company provided investors with segment summary historical financial information and segment historical data that is consistent with its new reportable segment structure and reflective of the intersegment accounting policies described in Note 10 - Segment Information. The Company's High-Touch Solutions N.A. segment provides value-added MRO solutions that are rooted in deep product knowledge and customer expertise. This segment includes the Grainger-branded businesses in the U.S., Canada, Mexico and Puerto Rico. The Company’s Endless Assortment segment provides a simple, transparent and streamlined experience for customers to shop millions of products online. This segment includes the Company’s Zoro Tools, Inc. (Zoro) businesses in the U.S. and U.K. and MonotaRO Co., Ltd. (MonotaRO), which operates predominately in Japan. The remaining international High-Touch Solutions businesses, operating primarily in the U.K., are classified as “Other” to reconcile to consolidated results. These businesses individually do not meet the criteria of a reportable segment.