CONTINGENCIES AND LEGAL MATTERS	12 Months Ended
CONTINGENCIES AND LEGAL MATTERS	Dec. 31, 2022
CONTINGENCIES AND LEGAL MATTERS [Abstract]
CONTINGENCIES AND LEGAL MATTERS	CONTINGENCIES AND LEGAL MATTERS From time to time the Company is involved in various legal and administrative proceedings, including claims related to: product liability, safety or compliance; privacy and cybersecurity matters; negligence; contract disputes; environmental issues; unclaimed property; wage and hour laws; intellectual property; advertising and marketing; consumer protection; pricing (including disaster or emergency declaration pricing statutes); employment practices; regulatory compliance, including trade and export matters; anti-bribery and corruption; and other matters and actions brought by employees, consumers, competitors, suppliers, customers, governmental entities and other third parties. As previously disclosed, since the fourth quarter of 2019, Grainger, KMCO, LLC (KMCO) and other defendants have been named in several product liability-related lawsuits in the Harris County, Texas District Court relating to an explosion at a KMCO chemical refinery located in Crosby, Harris County, Texas on April 2, 2019. The complaints in which Grainger has been named, which to date encompass approximately 186 plaintiffs, seek recovery of compensatory and other damages and relief in relation to personal injury, including one death and various other alleged injuries. On May 8, 2020, KMCO filed a voluntary petition in the United States Bankruptcy Court for the Southern District of Texas for relief under Chapter 7 of Title 11 of the United States Bankruptcy Court in the case KMCO, LLC, No. 20-60028. As a result of the Chapter 7 proceedings, the claims against KMCO in the Harris County lawsuits were stayed. Effective January 1, 2021, the Bankruptcy Court lifted the stay with respect to KMCO. In the product liability cases, the Harris County District Court decided to schedule bellwether trials involving a subset of plaintiffs the Court believes are representative of the parties' claims and defenses, and the first of such trials involving six plaintiffs (the First Scheduled Trial) was scheduled to commence in mid-January 2023. Prior to the start of the First Scheduled Trial, the Company and 27 plaintiffs engaged in mediation and reached settlements in principle with respect to such plaintiffs' claims against the Company. Those 27 plaintiffs include the plaintiffs who alleged the most serious injuries, as well as five of the six plaintiffs from the First Scheduled Trial. The Company has executed final settlement agreements with those 27 plaintiffs. Grainger believes the payment of these settlements is probable through available insurance. The Company recorded a contingent liability related to these settlements in Accrued expenses and a corresponding recoverable asset in Prepaid expenses and other current assets on the Consolidated Balance Sheet as of December 31, 2022, which resulted in no effect to the Company's Consolidated Statement of Earnings for the year ended December 31, 2022. Whether trials involving any or all of the remaining plaintiffs will proceed is uncertain and the timing or outcome of any such trials cannot currently be predicted, nor is it currently possible to make any additional estimate of potential loss or range of loss. On December 16, 2020, KMCO, the trustee of its estate and ORG Chemical Holdings, LLC, KMCO’s parent company (ORG), filed a property damage lawsuit relating to the KMCO chemical refinery incident against Grainger and another defendant in the Harris County, Texas District Court, which seeks unspecified damages (the KMCO Case). On April 1, 2021, 24 individual plaintiffs filed a petition in intervention seeking to be added as plaintiffs in the KMCO Case and seeking unspecified damages. On March 24, 2021, Indian Harbor Insurance Company, together with other insurance companies and underwriters, filed a property damage lawsuit relating to the KMCO chemical refinery incident against Grainger and another defendant in the Harris County, Texas District Court, seeking reimbursement of insurance payments made to or on behalf of KMCO and ORG, the insured parties under their respective policies, and other damages. The Company is currently unable to predict the timing, outcome or any estimate of possible loss or range of loss of the ORG and the Indian Harbor Insurance Company lawsuits. Grainger continues to investigate each of the various remaining claims against the Company relating to the KMCO chemical refinery incident and intends to contest these matters vigorously. Also, as a government contractor selling to federal, state and local governmental entities, the Company may be subject to governmental or regulatory inquiries or audits or other proceedings, including those related to contract administration, pricing and product compliance. From time to time, the Company has also been named, along with numerous other nonaffiliated companies, as defendant in litigation in various states involving asbestos and/or silica. These lawsuits typically assert claims of personal injury arising from alleged exposure to asbestos and/or silica as a consequence of products manufactured by third parties purportedly distributed by the Company. While several lawsuits have been dismissed in the past based on the lack of product identification, if a specific product distributed by the Company is identified in any pending or future lawsuits, the Company will seek to exercise indemnification remedies against the product manufacturer to the extent available. In addition, the Company believes that a substantial number of these claims are covered by insurance. The Company has entered into agreements with its major insurance carriers relating to the scope, coverage and the costs of defense, of lawsuits involving claims of exposure to asbestos. The Company believes it has strong legal and factual defenses and intends to continue defending itself vigorously in these lawsuits. While the Company is unable to predict the outcome of any of these proceedings and other matters, it believes that their ultimate resolution will not have, either individually or in the aggregate, a material adverse effect on the Company’s consolidated financial condition or results of operations.