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CONSOLIDATED STATEMENTS OF COMPREHENSIVE EARNINGS - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Statement of Comprehensive Income [Abstract]      
Net earnings $ 1,114 $ 755 $ 895
Other comprehensive earnings (losses):      
Foreign currency translation adjustments – net of reclassification to earnings (see Note 2 and Note 11) (64) 83 26
Postretirement benefit plan gains (losses) – net of tax benefit (expense) of $—, $(7), and $2, respectively (see Note 7 and Note 11) 0 22 (6)
Total other comprehensive earnings (losses) (64) 105 20
Comprehensive earnings – net of tax 1,050 860 915
Less: Comprehensive earnings (losses) attributable to noncontrolling interest      
Net earnings 71 60 46
Foreign currency translation adjustments (29) 12 3
Total comprehensive earnings (losses) attributable to noncontrolling interest 42 72 49
Comprehensive earnings attributable to W.W. Grainger, Inc. $ 1,008 $ 788 $ 866