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SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (Tables)
 12 Months Ended
Dec. 31, 2018
SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) [Abstract]  
Schedule of Quarterly Financial Information
A summary of selected quarterly information for 2018 and 2017 is as follows (in millions of dollars, except for per share amounts):
 
 
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

 
 
2017 Quarter Ended
 
 
March 31
 
June 30
 
September 30
 
December 31
 
Total
Net sales
 
$
2,541

 
$
2,615

 
$
2,636

 
$
2,633

 
$
10,425

COGS
 
1,522

 
1,575

 
1,619

 
1,611

 
6,327

Gross profit
 
1,019

 
1,040

 
1,017

 
1,022

 
4,098

SG&A
 
726

 
811

 
740

 
786

 
3,063

Operating earnings
 
293

 
229

 
277

 
236

 
1,035

Net earnings attributable to W.W. Grainger, Inc.
 
175

 
98

 
162

 
151

 
586

Earnings per share - basic
 
2.95

 
1.68

 
2.80

 
2.64

 
10.07

Earnings per share - diluted
 
$
2.93

 
$
1.67

 
$
2.79

 
$
2.63

 
$
10.02