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Significant Accounting Policies - Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Earnings per share    
Options outstanding not included in computation of diluted earnings per share (in shares) 23.1 8.7
Numerator:    
Net income attributable to 3M $ 1,299 $ 1,624
Denominator:    
Denominator for weighted average 3M common shares outstanding - basic (in shares) 572.3 580.5
Dilution associated with the Company's stock-based compensation plans (in shares) 2.7 5.8
Denominator for weighted average 3M common shares outstanding - diluted (in shares) 575.0 586.3
Earnings per share attributable to 3M common shareholders - basic (in dollars per share) $ 2.27 $ 2.80
Earnings per share attributable to 3M common shareholders - diluted (in dollars per share) $ 2.26 $ 2.77