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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE EARNINGS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net earnings	$ 185	$ 262
Other comprehensive earnings (losses):
Foreign currency translation adjustments, net of reclassification	(58)	4
Postretirement benefit plan reclassification, net of tax benefit of $1 million and $1 million, respectively	(3)	(3)
Other	1	0
Total other comprehensive earnings (losses)	(60)	1
Comprehensive earnings, net of tax	125	263
Less: Comprehensive earnings (losses) attributable to noncontrolling interest
Net earnings	12	9
Foreign currency translation adjustments	3	(2)
Total comprehensive earnings (losses) attributable to noncontrolling interest	15	7
Comprehensive earnings attributable to W.W. Grainger, Inc.	$ 110	$ 256

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