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Significant Accounting Policies (Tables) | 6 Months Ended
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Jun. 30, 2019
Earnings per share | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three months ended |  | Six months ended |
​ | ​ | June 30, | ​ | June 30, | ​
(Amounts in millions, except per share amounts) |  | 2019 |  | 2018 |  | 2019 |  | 2018 |
Numerator: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net income attributable to 3M | ​ | $ | 1,127 | ​ | $ | 1,857 | ​ | $ | 2,018 | ​ | $ | 2,459 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Denominator: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Denominator for weighted average 3M common shares outstanding – basic | ​ |  | 577.7 | ​ |  | 591.4 | ​ |  | 577.6 | ​ |  | 593.8 | ​
Dilution associated with the Company’s stock-based compensation plans | ​ |  | 8.4 | ​ |  | 12.8 | ​ |  | 9.7 | ​ |  | 14.7 | ​
Denominator for weighted average 3M common shares outstanding – diluted | ​ |  | 586.1 | ​ |  | 604.2 | ​ |  | 587.3 | ​ |  | 608.5 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Earnings per share attributable to 3M common shareholders – basic | ​ | $ | 1.95 | ​ | $ | 3.14 | ​ | $ | 3.49 | ​ | $ | 4.14 | ​
Earnings per share attributable to 3M common shareholders – diluted | ​ | $ | 1.92 | ​ | $ | 3.07 | ​ | $ | 3.44 | ​ | $ | 4.04 | ​

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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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