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Significant Accounting Policies (Tables) | 3 Months Ended
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Mar. 31, 2018
Significant Accounting Policies |
Impact on previously reported values after correction |
Three months ended March 31, 2017 |  | Previously |  |  |  |  |
(Millions) |  | Reported |  | Revised |  | Change |
Net Sales |  | $ | 7,685 |  | $ | 7,685 |  | $ | — |
Operating expenses |  |  |  |  |  |  |  |  |  |
Cost of sales |  |  | 3,869 |  |  | 3,882 |  |  | 13 |
Selling, general and administrative expenses |  |  | 1,600 |  |  | 1,614 |  |  | 14 |
Research, development and related expenses |  |  | 471 |  |  | 476 |  |  | 5 |
Gain on sale of businesses |  |  | (29) |  |  | (29) |  |  | — |
Total operating expenses |  |  | 5,911 |  |  | 5,943 |  |  | 32 |
Operating income |  | $ | 1,774 |  | $ | 1,742 |  | $ | (32) |
Other expense (income), net |  | $ | 37 |  | $ | 5 |  | $ | (32) |
Income before income taxes |  | $ | 1,737 |  | $ | 1,737 |  | $ | — |
Earnings per share |
|  | Three months ended |
|  | March 31, |
(Amounts in millions, except per share amounts) |  | 2018 |  | 2017 |
Numerator: |  |  |  |  |  |  |
Net income attributable to 3M |  | $ | 602 |  | $ | 1,323 |
Denominator: |  |  |  |  |  |  |
Denominator for weighted average 3M common shares outstanding – basic |  |  | 596.2 |  |  | 598.1 |
Dilution associated with the Company’s stock-based compensation plans |  |  | 16.5 |  |  | 13.9 |
Denominator for weighted average 3M common shares outstanding – diluted |  |  | 612.7 |  |  | 612.0 |
Earnings per share attributable to 3M common shareholders – basic |  | $ | 1.01 |  | $ | 2.21 |
Earnings per share attributable to 3M common shareholders – diluted |  | $ | 0.98 |  | $ | 2.16 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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