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SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (Tables) | 12 Months Ended
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Dec. 31, 2018
SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) [Abstract] |
Schedule of Quarterly Financial Information | A summary of selected quarterly information for 2018 and 2017 is as follows (in millions of dollars, except for per share amounts):
|  | 2018 Quarter Ended
|  | March 31 |  | June 30 |  | September 30 |  | December 31 |  | Total
Net sales |  | $ | 2,766 |  |  | $ | 2,861 |  |  | $ | 2,831 |  |  | $ | 2,763 |  |  | $ | 11,221 |
COGS |  | 1,674 |  |  | 1,750 |  |  | 1,752 |  |  | 1,697 |  |  | 6,873 |
Gross profit |  | 1,092 |  |  | 1,111 |  |  | 1,079 |  |  | 1,066 |  |  | 4,348 |
SG&A |  | 757 |  |  | 767 |  |  | 890 |  |  | 776 |  |  | 3,190 |
Operating earnings |  | 335 |  |  | 344 |  |  | 189 |  |  | 290 |  |  | 1,158 |
Net earnings attributable to W.W. Grainger, Inc. |  | 232 |  |  | 237 |  |  | 104 |  |  | 209 |  |  | 782 |
Earnings per share - basic |  | 4.09 |  |  | 4.19 |  |  | 1.84 |  |  | 3.71 |  |  | 13.82 |
Earnings per share - diluted |  | $ | 4.07 |  |  | $ | 4.16 |  |  | $ | 1.82 |  |  | $ | 3.68 |  |  | $ | 13.73 |
|  | 2017 Quarter Ended
|  | March 31 |  | June 30 |  | September 30 |  | December 31 |  | Total
Net sales |  | $ | 2,541 |  |  | $ | 2,615 |  |  | $ | 2,636 |  |  | $ | 2,633 |  |  | $ | 10,425 |
COGS |  | 1,522 |  |  | 1,575 |  |  | 1,619 |  |  | 1,611 |  |  | 6,327 |
Gross profit |  | 1,019 |  |  | 1,040 |  |  | 1,017 |  |  | 1,022 |  |  | 4,098 |
SG&A |  | 726 |  |  | 811 |  |  | 740 |  |  | 786 |  |  | 3,063 |
Operating earnings |  | 293 |  |  | 229 |  |  | 277 |  |  | 236 |  |  | 1,035 |
Net earnings attributable to W.W. Grainger, Inc. |  | 175 |  |  | 98 |  |  | 162 |  |  | 151 |  |  | 586 |
Earnings per share - basic |  | 2.95 |  |  | 1.68 |  |  | 2.80 |  |  | 2.64 |  |  | 10.07 |
Earnings per share - diluted |  | $ | 2.93 |  |  | $ | 1.67 |  |  | $ | 2.79 |  |  | $ | 2.63 |  |  | $ | 10.02 |

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=84173487&loc=d3e1280-108306 + Details
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