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Significant Accounting Policies (Tables) | 3 Months Ended
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Mar. 31, 2022
Accounting Policies [Abstract] |
Earnings per share computations | The computations for basic and diluted earnings per share follow: Earnings Per Share Computations
|  | Three months ended March 31, |  |
(Amounts in millions, except per share amounts) |  | 2022 |  | 2021 |  |  |  |
Numerator: |  |  |  |  |  |  |  |
Net income attributable to 3M |  | $ | 1,299 |  |  | $ | 1,624 |  |  |  |  |
Denominator: |  |  |  |  |  |  |  |
Denominator for weighted average 3M common shares outstanding – basic |  | 572.3 |  |  | 580.5 |  |  |  |  |
Dilution associated with the Company’s stock-based compensation plans |  | 2.7 |  |  | 5.8 |  |  |  |  |
Denominator for weighted average 3M common shares outstanding – diluted |  | 575.0 |  |  | 586.3 |  |  |  |  |
Earnings per share attributable to 3M common shareholders – basic |  | $ | 2.27 |  |  | $ | 2.80 |  |  |  |  |
Earnings per share attributable to 3M common shareholders – diluted |  | $ | 2.26 |  |  | $ | 2.77 |  |  |  |  |

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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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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