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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE EARNINGS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net earnings	$ 262	$ 241
Other comprehensive (losses) earnings:
Foreign currency translation adjustments, net of reclassification	4	23
Postretirement benefit plan reclassification, net of tax benefit of $1 and $1, respectively	(3)	(2)
Total other comprehensive earnings	1	21
Comprehensive earnings, net of tax	263	262
Less: Comprehensive earnings (losses) attributable to noncontrolling interest
Net earnings	9	9
Foreign currency translation adjustments	(2)	9
Comprehensive earnings attributable to noncontrolling interest	7	18
Comprehensive earnings attributable to W.W. Grainger, Inc.	$ 256	$ 244

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