SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (Tables)

12 Months Ended

Dec. 31, 2019

SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) [Abstract]

Schedule of Quarterly Financial Information

A summary of selected quarterly information for 2019 and 2018 is as follows (in millions of dollars, except for per share amounts):

	2019 Quarter Ended
	March 31		June 30		September 30		December 31		Total
Net sales	$	2,799	$	2,893	$	2,947	$	2,847	$	11,486
COGS	1,704		1,772		1,848		1,765		7,089
Gross profit	1,095		1,121		1,099		1,082		4,397
SG&A	732		741		761		901		3,135
Operating earnings	363		380		338		181		1,262
Net earnings attributable to W.W. Grainger, Inc.	$	253	$	260	$	233	$	103	$	849
Earnings per share - basic	$	4.50	$	4.69	$	4.27	$	1.89	$	15.39
Earnings per share - diluted	$	4.48	$	4.67	$	4.25	$	1.88	$	15.32

	2018 Quarter Ended
	March 31		June 30		September 30		December 31		Total
Net sales	$	2,766	$	2,861	$	2,831	$	2,763	$	11,221
COGS	1,674		1,750		1,752		1,697		6,873
Gross profit	1,092		1,111		1,079		1,066		4,348
SG&A	757		767		890		776		3,190
Operating earnings	335		344		189		290		1,158
Net earnings attributable to W.W. Grainger, Inc.	$	232	$	237	$	104	$	209	$	782
Earnings per share - basic	$	4.09	$	4.19	$	1.84	$	3.71	$	13.82
Earnings per share - diluted	$	4.07	$	4.16	$	1.82	$	3.68	$	13.73