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Significant Accounting Policies (Tables) | 9 Months Ended
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Sep. 30, 2022
Accounting Policies [Abstract] |
Schedule of earnings per share computations | The computations for basic and diluted earnings per share follow: Earnings Per Share Computations
|  | Three months ended September 30, |  | Nine months ended September 30,
(Amounts in millions, except per share amounts) |  | 2022 |  | 2021 |  | 2022 |  | 2021
Numerator: |  |  |  |  |  |  |  |
Net income attributable to 3M |  | $ | 3,859 |  |  | $ | 1,434 |  |  | $ | 5,236 |  |  | $ | 4,582 |
Denominator: |  |  |  |  |  |  |  |
Denominator for weighted average 3M common shares outstanding – basic |  | 568.8 |  |  | 579.6 |  |  | 570.7 |  |  | 580.3 |
Dilution associated with the Company’s stock-based compensation plans |  | 1.2 |  |  | 6.7 |  |  | 1.9 |  |  | 6.8 |
Denominator for weighted average 3M common shares outstanding – diluted |  | 570.0 |  |  | 586.3 |  |  | 572.6 |  |  | 587.1 |
Earnings per share attributable to 3M common shareholders – basic |  | $ | 6.79 |  |  | $ | 2.47 |  |  | $ | 9.18 |  |  | $ | 7.90 |
Earnings per share attributable to 3M common shareholders – diluted |  | $ | 6.77 |  |  | $ | 2.45 |  |  | $ | 9.15 |  |  | $ | 7.81 |

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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 https://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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