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EARNINGS PER SHARE - Schedule of Computation of Basic and Diluted Earnings per Share under Two-Class Method (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Earnings Per Share [Abstract]        
Net earnings attributable to W.W. Grainger, Inc. as reported $ 172,676 $ 220,548 $ 359,389 $ 431,563
Distributed earnings available to participating securities (576) (742) (1,202) (1,510)
Undistributed earnings available to participating securities (970) (1,418) (2,092) (2,879)
Numerator for basic earnings per share – Undistributed and distributed earnings available to common shareholders 171,130 218,388 356,095 427,174
Undistributed earnings allocated to participating securities 970 1,418 2,092 2,879
Undistributed earnings reallocated to participating securities (964) (1,404) (2,078) (2,850)
Numerator for diluted earnings per share – Undistributed and distributed earnings available to common shareholders $ 171,136 $ 218,402 $ 356,109 $ 427,203
Denominator for basic earnings per share - weighted average shares (in shares) 60,891,298 66,652,130 61,278,981 66,939,110
Effect of dilutive securities (in shares) 410,247 665,001 420,622 708,579
Denominator for diluted earnings per share - weighted average shares adjusted for dilutive securities (in shares) 61,301,545 67,317,131 61,699,603 67,647,689
Basic (in dollars per share) $ 2.81 $ 3.28 $ 5.81 $ 6.38
Diluted (in dollars per share) $ 2.79 $ 3.25 $ 5.77 $ 6.32