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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, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Net earnings attributable to W.W. Grainger, Inc. as reported	$ 236,981	$ 97,921	$ 468,516	$ 272,665
Distributed earnings available to participating securities	(345)	(427)	(956)	(973)
Undistributed earnings available to participating securities	(1,473)	(217)	(2,861)	(1,159)
Numerator for basic earnings per share – Undistributed and distributed earnings available to common shareholders	235,163	97,277	464,699	270,533
Undistributed earnings allocated to participating securities	1,473	217	2,861	1,159
Undistributed earnings reallocated to participating securities	(1,462)	(216)	(2,841)	(1,152)
Numerator for diluted earnings per share – Undistributed and distributed earnings available to common shareholders	$ 235,174	$ 97,278	$ 464,719	$ 270,540
Denominator for basic earnings per share - weighted average shares (in shares)	56,109,809	58,012,731	56,086,592	58,363,416
Effect of dilutive securities (in shares)	442,835	274,581	392,053	377,846
Denominator for diluted earnings per share - weighted average shares adjusted for dilutive securities (in shares)	56,552,644	58,287,312	56,478,645	58,741,262
Basic (in dollars per share)	$ 4.19	$ 1.68	$ 8.29	$ 4.64
Diluted (in dollars per share)	$ 4.16	$ 1.67	$ 8.23	$ 4.61

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