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SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (Tables) | 12 Months Ended
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Dec. 31, 2020
SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) [Abstract] |
Schedule of Quarterly Financial Information | A summary of selected quarterly information for 2020 and 2019 is as follows (in millions of dollars, except for per share amounts):
|  | 2020 Quarter Ended
|  | March 31 |  | June 30 |  | September 30 |  | December 31 |  | Total
Net sales |  | $ | 3,001 |  |  | $ | 2,837 |  |  | $ | 3,018 |  |  | $ | 2,941 |  |  | $ | 11,797 |
COGS |  | 1,880 |  |  | 1,821 |  |  | 1,944 |  |  | 1,914 |  |  | 7,559 |
Gross profit |  | 1,121 |  |  | 1,016 |  |  | 1,074 |  |  | 1,027 |  |  | 4,238 |
SG&A |  | 962 |  |  | 811 |  |  | 694 |  |  | 752 |  |  | 3,219 |
Operating earnings |  | 159 |  |  | 205 |  |  | 380 |  |  | 275 |  |  | 1,019 |
Net earnings attributable to W.W. Grainger, Inc. |  | $ | 173 |  |  | $ | 114 |  |  | $ | 240 |  |  | $ | 168 |  |  | $ | 695 |
Earnings per share - basic |  | $ | 3.20 |  |  | $ | 2.11 |  |  | $ | 4.43 |  |  | $ | 3.14 |  |  | $ | 12.88 |
Earnings per share - diluted |  | $ | 3.19 |  |  | $ | 2.10 |  |  | $ | 4.41 |  |  | $ | 3.12 |  |  | $ | 12.82 |
|  | 2019 Quarter Ended
|  | March 31 |  | June 30 |  | September 30 |  | December 31 |  | Total
Net sales |  | $ | 2,799 |  |  | $ | 2,893 |  |  | $ | 2,947 |  |  | $ | 2,847 |  |  | $ | 11,486 |
COGS |  | 1,704 |  |  | 1,772 |  |  | 1,848 |  |  | 1,765 |  |  | 7,089 |
Gross profit |  | 1,095 |  |  | 1,121 |  |  | 1,099 |  |  | 1,082 |  |  | 4,397 |
SG&A |  | 732 |  |  | 741 |  |  | 761 |  |  | 901 |  |  | 3,135 |
Operating earnings |  | 363 |  |  | 380 |  |  | 338 |  |  | 181 |  |  | 1,262 |
Net earnings attributable to W.W. Grainger, Inc. |  | $ | 253 |  |  | $ | 260 |  |  | $ | 233 |  |  | $ | 103 |  |  | $ | 849 |
Earnings per share - basic |  | $ | 4.50 |  |  | $ | 4.69 |  |  | $ | 4.27 |  |  | $ | 1.89 |  |  | $ | 15.39 |
Earnings per share - diluted |  | $ | 4.48 |  |  | $ | 4.67 |  |  | $ | 4.25 |  |  | $ | 1.88 |  |  | $ | 15.32 |

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- Definition SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) [Abstract] + References No definition available. + Details
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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121640914&loc=d3e1280-108306 + Details
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