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CONSOLIDATED STATEMENTS OF COMPREHENSIVE EARNINGS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net earnings	$ 823	$ 623	$ 633
Other comprehensive (losses) earnings:
Foreign currency translation adjustments, net of reclassification (see Note 7 and Note 14)	(41)	93	(39)
Postretirement benefit plan re-measurement, net of tax expense $29 (see Note 10 and Note 14)	0	47	0
Postretirement benefit plan reclassification, net of tax benefit of $3, $1 and $7	(7)	2	(12)
Total other comprehensive (losses) earnings	(48)	142	(51)
Comprehensive earnings, net of tax	775	765	582
Less: Comprehensive earnings attributable to noncontrolling interest
Net earnings	41	37	27
Foreign currency translation adjustments	3	4	1
Comprehensive earnings attributable to noncontrolling interest	44	41	28
Comprehensive earnings attributable to W.W. Grainger, Inc.	$ 731	$ 724	$ 554

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