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SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) [Abstract]                      
Net sales $ 2,941 $ 3,018 $ 2,837 $ 3,001 $ 2,847 $ 2,947 $ 2,893 $ 2,799 $ 11,797 $ 11,486 $ 11,221
Cost of goods sold 1,914 1,944 1,821 1,880 1,765 1,848 1,772 1,704 7,559 7,089 6,873
Gross profit 1,027 1,074 1,016 1,121 1,082 1,099 1,121 1,095 4,238 4,397 4,348
Selling, general and administrative expenses 752 694 811 962 901 761 741 732 3,219 3,135 3,190
Operating earnings 275 380 205 159 181 338 380 363 1,019 1,262 1,158
Net earnings attributable to W.W. Grainger, Inc. $ 168 $ 240 $ 114 $ 173 $ 103 $ 233 $ 260 $ 253 $ 695 $ 849 $ 782
Earnings per share - basic (in dollars per share) $ 3.14 $ 4.43 $ 2.11 $ 3.20 $ 1.89 $ 4.27 $ 4.69 $ 4.50 $ 12.88 $ 15.39 $ 13.82
Earnings per share - diluted (in dollars per share) $ 3.12 $ 4.41 $ 2.10 $ 3.19 $ 1.88 $ 4.25 $ 4.67 $ 4.48 $ 12.82 $ 15.32 $ 13.73