XML 41 R58.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Significant Accounting Policies - Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Earnings per share                      
Options outstanding not included in computation of diluted earnings per share (in shares)                 8.9 2.9 0.8
Numerator:                      
Net income attributable to 3M $ 969 $ 1,583 $ 1,127 $ 891 $ 1,347 $ 1,543 $ 1,857 $ 602 $ 4,570 $ 5,349 $ 4,858
Denominator:                      
Denominator for weighted average 3M common shares outstanding - basic (in shares)                 577.0 588.5 597.5
Dilution associated with the Company's stock-based compensation plans (in shares)                 8.1 13.5 15.2
Denominator for weighted average 3M common shares outstanding - diluted (in shares)                 585.1 602.0 612.7
Earnings per share attributable to 3M common shareholders - basic (in dollars per share) $ 1.68 $ 2.75 $ 1.95 $ 1.54 $ 2.32 $ 2.64 $ 3.14 $ 1.01 $ 7.92 $ 9.09 $ 8.13
Earnings per share attributable to 3M common shareholders - diluted (in dollars per share) $ 1.66 $ 2.72 $ 1.92 $ 1.51 $ 2.27 $ 2.58 $ 3.07 $ 0.98 $ 7.81 $ 8.89 $ 7.93