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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	3 Months Ended
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	Mar. 31, 2026
Organization, Consolidation and Presentation of Financial Statements [Abstract]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES W.W. Grainger, Inc. is a broad line distributor of maintenance, repair and operating (MRO) products and services with operations primarily in North America (N.A.) and Japan. In the fourth quarter of 2025, Grainger exited the United Kingdom (U.K.) market by completing the sale of the Cromwell business and closing the Zoro U.K. business. In this report, the words “Grainger” or “Company” 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. Basis of Presentation The Company's Condensed Consolidated Financial Statements have been prepared in accordance with U.S. generally accepted accounting principles (GAAP) for interim financial reporting and the rules and regulations of the U.S. Securities and Exchange Commission (SEC) and therefore do not include all information and disclosures normally included in the annual Consolidated Financial Statements. The preparation of these Condensed Consolidated Financial Statements and accompanying notes in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported. Actual results could differ materially from these estimated amounts. In the opinion of the Company’s management, the Condensed Consolidated Financial Statements reflect all adjustments, which are normal and recurring in nature, necessary for fair financial statement presentation. The Condensed Consolidated Balance Sheet at December 31, 2025, has been derived from the audited Consolidated Financial Statements at that date but does not include all of the information and footnotes required by GAAP for complete financial statements. The Condensed Consolidated Financial Statements should be read in conjunction with the Consolidated Financial Statements and accompanying notes for the year ended December 31, 2025 included in the Company’s Annual Report on Form 10-K filed with the SEC on February 19, 2026 (2025 Form 10-K). There were no material changes to the Company’s significant accounting policies from those disclosed in Note 1 of the Notes to Consolidated Financial Statements in Part II, Item 8: Financial Statements and Supplementary Data in the Company's 2025 Form 10-K.