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CONSOLIDATED STATEMENTS OF EARNINGS - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Statement [Abstract]      
Net sales $ 11,221 $ 10,425 $ 10,137
Cost of goods sold 6,873 6,327 6,022
Gross profit 4,348 4,098 4,115
Selling, general and administrative expenses 3,190 3,063 3,002
Operating earnings 1,158 1,035 1,113
Other income (expense):      
Interest income 6 3 1
Interest expense (88) (89) (76)
Loss from equity method investment (19) (37) (31)
Other, net 24 24 12
Total other expense (77) (99) (94)
Earnings before income taxes 1,081 936 1,019
Income taxes 258 313 386
Net earnings 823 623 633
Less: Net earnings attributable to noncontrolling interest 41 37 27
Net earnings attributable to W.W. Grainger, Inc. $ 782 $ 586 $ 606
Earnings per share:      
Basic (in dollars per share) $ 13.82 $ 10.07 $ 9.94
Diluted (in dollars per share) $ 13.73 $ 10.02 $ 9.87
Weighted average number of shares outstanding:      
Basic (in shares) 56,142,604 57,674,977 60,430,892
Diluted (in shares) 56,534,185 57,983,167 60,839,930