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Pension and Postretirement Benefit Plans - Narrative (Details)
1 Months Ended 3 Months Ended 6 Months Ended
May 31, 2019
USD ($)
person
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2020
USD ($)
Benefit Plan Information            
Defined benefit pension and postretirement plans adjustment   $ (58,000,000) $ (196,000,000) $ (177,000,000) $ (280,000,000)  
International | Funded | United Kingdom Pension Plan            
Benefit Plan Information            
Defined benefit pension and postretirement plans adjustment   80,000,000        
Qualified and Non-qualified Pension Benefits | Funded            
Benefit Plan Information            
Company contributions year to date       75,000,000    
Qualified and Non-qualified Pension Benefits | United States | Funded            
Benefit Plan Information            
Special termination benefits - number of additional years of pension service 1          
Special termination benefits - number of additional years of age for certain benefit calculations 1          
Special termination benefits - number of participants | person 800          
Special termination benefits charge     35,000,000      
Postretirement Benefits | Funded            
Benefit Plan Information            
Company contributions year to date       2,000,000    
Maximum life insurance and death benefit to be paid under the modified 3M Retiree Life Insurance Plan postretirement benefit $ 8,000          
Defined benefit pension and postretirement plans adjustment     150,000,000      
Total Accumulated Other Comprehensive Income (Loss)            
Benefit Plan Information            
Defined benefit pension and postretirement plans adjustment   (58,000,000) (196,000,000) $ (177,000,000) $ (280,000,000)  
Total Accumulated Other Comprehensive Income (Loss) | International | Funded | United Kingdom Pension Plan            
Benefit Plan Information            
Defined benefit pension and postretirement plans adjustment   $ 80,000,000        
Total Accumulated Other Comprehensive Income (Loss) | Postretirement Benefits | Funded            
Benefit Plan Information            
Defined benefit pension and postretirement plans adjustment     $ 150,000,000      
Forecast | Pension and Postretirement Benefit Plans | Funded | Maximum            
Benefit Plan Information            
Estimated pension and postretirement employer contributions in current fiscal year           $ 200,000,000