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EARNINGS PER SHARE (Tables)
 3 Months Ended
Mar. 31, 2019
Earnings Per Share [Abstract]  
Schedule of Computation of Basic and Diluted Earnings per Share under Two-Class Method
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):
 
Three Months Ended
 
March 31,
 
2019
 
2018
Net earnings attributable to W.W. Grainger, Inc. as reported
253

 
$
232

Distributed earnings available to participating securities
(1
)
 
(1
)
Undistributed earnings available to participating securities
(2
)
 
(1
)
Numerator for basic earnings per share – Undistributed and distributed earnings available to common shareholders
250

 
230

Undistributed earnings allocated to participating securities
2

 
1

Undistributed earnings reallocated to participating securities
(2
)
 
(1
)
Numerator for diluted earnings per share – Undistributed and distributed earnings available to common shareholders
$
250

 
$
230

Denominator for basic earnings per share – weighted average shares
55,643,199

 
56,062,607

Effect of dilutive securities
304,429

 
340,639

Denominator for diluted earnings per share – weighted average shares adjusted for dilutive securities
55,947,628

 
56,403,246

Earnings per share two-class method
 

 
 

Basic
$
4.50

 
$
4.09

Diluted
$
4.48

 
$
4.07