CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Income Statement [Abstract]
Net sales	$ 4,554	$ 4,312	$ 8,860	$ 8,547
Cost of goods sold	2,799	2,618	5,395	5,185
Gross profit	1,755	1,694	3,465	3,362
Selling, general and administrative expenses	1,077	1,045	2,115	2,044
Operating earnings	678	649	1,350	1,318
Other expense (income):
Interest expense – net	20	20	41	41
Other – net	(3)	(7)	(9)	(14)
Total other expense – net	17	13	32	27
Earnings before income taxes	661	636	1,318	1,291
Income tax provision	153	146	310	304
Net earnings	508	490	1,008	987
Less net earnings attributable to noncontrolling interest	26	20	47	39
Net earnings attributable to W.W. Grainger, Inc.	$ 482	$ 470	$ 961	$ 948
Earnings per share:
Basic (in dollars per share)	$ 9.99	$ 9.54	$ 19.87	$ 19.20
Diluted (in dollars per share)	$ 9.97	$ 9.51	$ 19.83	$ 19.13
Weighted average number of shares outstanding:
Basic (in shares)	48.0	49.0	48.1	49.1
Diluted (in shares)	48.1	49.2	48.2	49.3