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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE EARNINGS - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net earnings	$ 244	$ 115	$ 778	$ 604
Other comprehensive earnings (losses):
Foreign currency translation adjustments	(17)	0	6	(25)
Postretirement benefit plan reclassification, net of tax benefit of $1, $1, $3 and $2, respectively	(2)	(2)	(7)	(8)
Total other comprehensive earnings (losses)	(19)	(2)	(1)	(33)
Comprehensive earnings, net of tax	225	113	777	571
Less: Comprehensive earnings (losses) attributable to noncontrolling interest
Net earnings	11	11	32	31
Foreign currency translation adjustments	(1)	(5)	2	(3)
Total comprehensive earnings (losses) attributable to noncontrolling interest	10	6	34	28
Comprehensive earnings attributable to W.W. Grainger, Inc.	$ 215	$ 107	$ 743	$ 543

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