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Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Significant Accounting Policies |
Impact on previously reported values after adoption |
Year ended December 31, 2017 |  | Previously |  | Reflecting ASU |  |  |
(Millions) |  | Reported |  | Adoption |  | Change |
Net Sales |  | $ | 31,657 |  | $ | 31,657 |  | $ | — |
Operating expenses |  |  |  |  |  |  |  |  |  |
Cost of sales |  |  | 16,001 |  |  | 16,055 |  |  | 54 |
Selling, general and administrative expenses |  |  | 6,572 |  |  | 6,626 |  |  | 54 |
Research, development and related expenses |  |  | 1,850 |  |  | 1,870 |  |  | 20 |
Gain on sale of businesses |  |  | (586) |  |  | (586) |  |  | — |
Total operating expenses |  |  | 23,837 |  |  | 23,965 |  |  | 128 |
Operating income |  | $ | 7,820 |  | $ | 7,692 |  | $ | (128) |
Other expense (income), net |  | $ | 272 |  | $ | 144 |  | $ | (128) |
Income before income taxes |  | $ | 7,548 |  | $ | 7,548 |  | $ | — |
Year ended December 31, 2016 |  | Previously |  | Reflecting ASU |  |  |
(Millions) |  | Reported |  | Adoption |  | Change |
Net Sales |  | $ | 30,109 |  | $ | 30,109 |  | $ | — |
Operating expenses |  |  |  |  |  |  |  |  |  |
Cost of sales |  |  | 15,040 |  |  | 15,118 |  |  | 78 |
Selling, general and administrative expenses |  |  | 6,222 |  |  | 6,311 |  |  | 89 |
Research, development and related expenses |  |  | 1,735 |  |  | 1,764 |  |  | 29 |
Gain on sale of businesses |  |  | (111) |  |  | (111) |  |  | — |
Total operating expenses |  |  | 22,886 |  |  | 23,082 |  |  | 196 |
Operating income |  | $ | 7,223 |  | $ | 7,027 |  | $ | (196) |
Other expense (income), net |  | $ | 170 |  | $ | (26) |  | $ | (196) |
Income before income taxes |  | $ | 7,053 |  | $ | 7,053 |  | $ | — |
Year ended December 31, 2015 |  | Previously |  | Reflecting ASU |  |  |
(Millions) |  | Reported |  | Adoption |  | Change |
Net Sales |  | $ | 30,274 |  | $ | 30,274 |  | $ | — |
Operating expenses |  |  |  |  |  |  |  |  |  |
Cost of sales |  |  | 15,383 |  |  | 15,351 |  |  | (32) |
Selling, general and administrative expenses |  |  | 6,229 |  |  | 6,233 |  |  | 4 |
Research, development and related expenses |  |  | 1,763 |  |  | 1,757 |  |  | (6) |
Gain on sale of businesses |  |  | (47) |  |  | (47) |  |  | — |
Total operating expenses |  |  | 23,328 |  |  | 23,294 |  |  | (34) |
Operating income |  | $ | 6,946 |  | $ | 6,980 |  | $ | 34 |
Other expense (income), net |  | $ | 123 |  | $ | 157 |  | $ | 34 |
Income before income taxes |  | $ | 6,823 |  | $ | 6,823 |  | $ | — |
Earnings per share | Earnings Per Share Computations
(Amounts in millions, except per share amounts) |  |  | 2017 |  | 2016 |  | 2015 |
Numerator: |  |  |  |  |  |  |  |  |  |  |
Net income attributable to 3M |  |  | $ | 4,858 |  | $ | 5,050 |  | $ | 4,833 |
Denominator: |  |  |  |  |  |  |  |  |  |  |
Denominator for weighted average 3M common shares outstanding – basic |  |  |  | 597.5 |  |  | 604.7 |  |  | 625.6 |
Dilution associated with the Company’s stock-based compensation plans |  |  |  | 15.2 |  |  | 14.0 |  |  | 11.6 |
Denominator for weighted average 3M common shares outstanding – diluted |  |  |  | 612.7 |  |  | 618.7 |  |  | 637.2 |
Earnings per share attributable to 3M common shareholders – basic |  |  | $ | 8.13 |  | $ | 8.35 |  | $ | 7.72 |
Earnings per share attributable to 3M common shareholders – diluted |  |  | $ | 7.93 |  | $ | 8.16 |  | $ | 7.58 |

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