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CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Income Statement [Abstract]    
Net sales $ 2,799 $ 2,766
Cost of goods sold 1,704 1,674
Gross profit 1,095 1,092
Selling, general and administrative expenses 732 757
Operating earnings 363 335
Other income (expense):    
Interest income 2 0
Interest expense (21) (25)
Losses from equity method investment 0 (11)
Other, net 7 8
Total other expense, net (12) (28)
Earnings before income taxes 351 307
Income taxes 89 66
Net earnings 262 241
Less: Net earnings attributable to noncontrolling interest 9 9
Net earnings attributable to W.W. Grainger, Inc. $ 253 $ 232
Earnings per share:    
Basic (in dollars per share) $ 4.50 $ 4.09
Diluted (in dollars per share) $ 4.48 $ 4.07
Weighted average number of shares outstanding:    
Basic (in shares) 55,643,199 56,062,607
Diluted (in shares) 55,947,628 56,403,246
Cash dividends paid per share (in dollars per share) $ 1.36 $ 1.28