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CONSOLIDATED STATEMENTS OF COMPREHENSIVE EARNINGS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net earnings	$ 755	$ 895	$ 823
Other comprehensive earnings (losses):
Foreign currency translation earnings (losses), net of reclassification (see Note 2 and Note 12)	83	26	(41)
Postretirement benefit plan gains (losses), net of tax (expense) benefit of $(7), $2, and $3, respectively	22	(6)	(7)
Total other comprehensive (losses) earnings	105	20	(48)
Comprehensive earnings, net of tax	860	915	775
Less: Comprehensive earnings (losses) attributable to noncontrolling interest
Net earnings	60	46	41
Foreign currency translation adjustments	12	3	3
Total comprehensive earnings (losses) attributable to noncontrolling interest	72	49	44
Comprehensive earnings attributable to W.W. Grainger, Inc.	$ 788	$ 866	$ 731

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