| 3M Co., Debt to Capital |
| | Dec 31, 2017 | Dec 31, 2016 | Dec 31, 2015 | Dec 31, 2014 | Dec 31, 2013 | Dec 31, 2012 | Dec 31, 2011 |
| Selected Financial Data (USD $ in millions) |
| Short-term borrowings and current portion of long-term debt | 1,853 | 972 | 2,044 | 106 | 1,683 | 1,085 | 682 |
| Long-term debt, excluding current portion | 12,096 | 10,678 | 8,753 | 6,705 | 4,326 | 4,916 | 4,484 |
| Capital lease obligations | 60 | 45 | 46 | 59 | 58 | 58 | 58 |
| Total debt | 14,009 | 11,695 | 10,843 | 6,870 | 6,067 | 6,059 | 5,224 |
| Total 3M Company shareholders' equity | 11,563 | 10,298 | 11,708 | 13,109 | 17,502 | 17,502 | 17,502 |
| Total capital | 25,572 | 21,993 | 22,551 | 19,979 | 23,569 | 23,561 | 22,726 |
| Ratio |
| Debt to capital | 0.55 | 0.53 | 0.48 | 0.34 | 0.26 | 0.26 | 0.23 |
| Debt to capital = Total debt ÷ Total capital
= 14,009 ÷ 25,572 = 0.55 |