XML 98 R74.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Supplemental Equity and Comprehensive Income Information - Dividends and Transfer of Ownership Interest (Details) - $ / shares
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, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dividends declared in current period (in dollars per share) $ 1.44 $ 1.44 $ 1.44 $ 1.44 $ 1.36 $ 1.36 $ 1.36 $ 1.36 $ 1.175 $ 1.175 $ 1.175 $ 1.175 $ 5.76 $ 5.44 $ 4.70
3M India Limited                              
3M's ownership (as a percent)         75.00%                 75.00%