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Significant Restructuring Costs Change in Restructuring Reserve - 2021 Restructuring Plan (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Restructuring Cost and Reserve [Line Items]            
Restructuring and impairment costs $ 79   $ 610 $ 62 $ 175 $ 783
2021 Restructuring Plan            
Restructuring Cost and Reserve [Line Items]            
Restructuring and Related Cost, Total Expected Cost 385       385  
Restructuring and impairment costs 79 $ 96     175  
Payments for Restructuring (18) (5)        
Restructuring Reserve, Settled without Cash (40) (54)        
Restructuring Reserve 58 37     58  
2021 Restructuring Plan | Employee Severance            
Restructuring Cost and Reserve [Line Items]            
Restructuring and impairment costs 10 32        
Payments for Restructuring (7) (2)        
Restructuring Reserve, Settled without Cash 0 0        
Restructuring Reserve 33 30     33  
2021 Restructuring Plan | Long-Lived Asset Impairment            
Restructuring Cost and Reserve [Line Items]            
Restructuring and impairment costs 40 54        
Payments for Restructuring 0 0        
Restructuring Reserve, Settled without Cash (40) (54)        
Restructuring Reserve 0 0     0  
2021 Restructuring Plan | Other Restructuring            
Restructuring Cost and Reserve [Line Items]            
Restructuring and impairment costs 29 10        
Payments for Restructuring (11) (3)        
Restructuring Reserve, Settled without Cash 0 0        
Restructuring Reserve $ 25 $ 7     25  
2021 Restructuring Plan | Global Products            
Restructuring Cost and Reserve [Line Items]            
Restructuring and impairment costs         77  
2021 Restructuring Plan | Building Solutions North America            
Restructuring Cost and Reserve [Line Items]            
Restructuring and impairment costs         44  
2021 Restructuring Plan | Building Solutions EMEA/LA            
Restructuring Cost and Reserve [Line Items]            
Restructuring and impairment costs         20  
2021 Restructuring Plan | Corporate Segment            
Restructuring Cost and Reserve [Line Items]            
Restructuring and impairment costs         19  
2021 Restructuring Plan | Building Solutions Asia Pacific            
Restructuring Cost and Reserve [Line Items]            
Restructuring and impairment costs         $ 15