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SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) [Abstract]
Net sales	$ 2,847	$ 2,947	$ 2,893	$ 2,799	$ 2,763	$ 2,831	$ 2,861	$ 2,766	$ 11,486	$ 11,221	$ 10,425
Cost of goods sold	1,765	1,848	1,772	1,704	1,697	1,752	1,750	1,674	7,089	6,873	6,327
Gross profit	1,082	1,099	1,121	1,095	1,066	1,079	1,111	1,092	4,397	4,348	4,098
Selling, general and administrative expenses	901	761	741	732	776	890	767	757	3,135	3,190	3,063
Operating earnings	181	338	380	363	290	189	344	335	1,262	1,158	1,035
Net earnings attributable to W.W. Grainger, Inc.	$ 103	$ 233	$ 260	$ 253	$ 209	$ 104	$ 237	$ 232	$ 849	$ 782	$ 586
Earnings per share - basic (in dollars per share)	$ 1.89	$ 4.27	$ 4.69	$ 4.50	$ 3.71	$ 1.84	$ 4.19	$ 4.09	$ 15.39	$ 13.82	$ 10.07
Earnings per share - diluted (in dollars per share)	$ 1.88	$ 4.25	$ 4.67	$ 4.48	$ 3.68	$ 1.82	$ 4.16	$ 4.07	$ 15.32	$ 13.73	$ 10.02

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