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Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2018
Significant Accounting Policies |
Earnings per share | Earnings Per Share Computations
(Amounts in millions, except per share amounts) |  | 2018 |  | 2017 |  | 2016 |
Numerator: |  |  |  |  |  |  |  |  |  |
Net income attributable to 3M |  | $ | 5,349 |  | $ | 4,858 |  | $ | 5,050 |
Denominator: |  |  |  |  |  |  |  |  |  |
Denominator for weighted average 3M common shares outstanding – basic |  |  | 588.5 |  |  | 597.5 |  |  | 604.7 |
Dilution associated with the Company’s stock-based compensation plans |  |  | 13.5 |  |  | 15.2 |  |  | 14.0 |
Denominator for weighted average 3M common shares outstanding – diluted |  |  | 602.0 |  |  | 612.7 |  |  | 618.7 |
Earnings per share attributable to 3M common shareholders – basic |  | $ | 9.09 |  | $ | 8.13 |  | $ | 8.35 |
Earnings per share attributable to 3M common shareholders – diluted |  | $ | 8.89 |  | $ | 7.93 |  | $ | 8.16 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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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