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Insider Trading Arrangements
 3 Months Ended 9 Months Ended
Sep. 30, 2023
shares
Sep. 30, 2023
shares
Trading Arrangements, by Individual    
Material Terms of Trading Arrangement   On August 29, 2023, D.G. Macpherson, Grainger’s Chairman of the Board and Chief Executive Officer, adopted a written plan for the sale of shares received pursuant to the vesting of an equity award on October 1, 2023. The aggregate number of shares subject to the plan is 4,995 and excludes shares withheld by the Company to satisfy income tax withholding obligations in connection with the net settlement of such equity award. The plan is a multi-trade plan, is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) and will expire on December 31, 2023, or any earlier date on which all of the shares have been sold. None of the Company's other directors or officers adopted, modified, or terminated a Rule 10b5-1 trading arrangement or a non-Rule 10b5-1 trading arrangement during the Company's quarter ended September 30, 2023.
Rule 10b5-1 Arrangement Adopted false  
Non-Rule 10b5-1 Arrangement Adopted false  
Rule 10b5-1 Arrangement Terminated false  
Non-Rule 10b5-1 Arrangement Terminated false  
D.G. Macpherson [Member]    
Trading Arrangements, by Individual    
Name D.G. Macpherson  
Title Chairman of the Board and Chief Executive Officer  
Rule 10b5-1 Arrangement Adopted true  
Non-Rule 10b5-1 Arrangement Adopted false  
Adoption Date August 29, 2023  
Aggregate Available 4,995 4,995