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EARNINGS PER SHARE (Tables)
 12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
The following table sets forth the computation of basic and diluted earnings per share under the two-class method (in millions of dollars, except for share and per share amounts):
 
For the Years Ended December 31,
 
2018
 
2017
 
2016
 
 
 
 
 
 
Net earnings attributable to W.W. Grainger, Inc. as reported
$
782

 
$
586

 
$
606

   Distributed earnings available to participating securities
(2
)
 
(2
)
 
(2
)
   Undistributed earnings available to participating securities
(4
)
 
(3
)
 
(3
)
Numerator for basic earnings per share - Undistributed and distributed earnings available to common shareholders
776

 
581

 
601

   Undistributed earnings allocated to participating securities
4

 
3

 
3

   Undistributed earnings reallocated to participating securities
(4
)
 
(3
)
 
(3
)
Numerator for diluted earnings per share - Undistributed and distributed earnings available to common shareholders
$
776

 
$
581

 
$
601

 
 
 
 
 
 
Denominator for basic earnings per share – weighted average shares
56,142,604

 
57,674,977

 
60,430,892

Effect of dilutive securities
391,581

 
308,190

 
409,038

Denominator for diluted earnings per share – weighted average shares adjusted for dilutive securities
56,534,185

 
57,983,167

 
60,839,930

Earnings per share two-class method
 

 
 

 
 
Basic
$
13.82

 
$
10.07

 
$
9.94

Diluted
$
13.73

 
$
10.02

 
$
9.87