CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE EARNINGS - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net earnings	$ 129	$ 272	$ 314	$ 534
Other comprehensive earnings (losses):
Foreign currency translation adjustments, net of reclassification	64	19	6	23
Postretirement benefit plan reclassification, net of tax benefit of $1, $1, $2, and $2 million, respectively	(3)	(2)	(6)	(5)
Other	3	0	4	0
Total other comprehensive earnings (losses)	64	17	4	18
Comprehensive earnings, net of tax	193	289	318	552
Less: Comprehensive earnings (losses) attributable to noncontrolling interest
Net earnings	15	12	27	21
Foreign currency translation adjustments	(2)	5	1	3
Total comprehensive earnings (losses) attributable to noncontrolling interest	13	17	28	24
Comprehensive earnings attributable to W.W. Grainger, Inc.	$ 180	$ 272	$ 290	$ 528

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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