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Significant Restructuring Costs Change in Restructuring Reserve - 2021 Restructuring Plan (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Sep. 30, 2021
Restructuring Cost and Reserve [Line Items]          
Restructuring and impairment costs $ 384 $ 96 $ 433 $ 96  
2021 Restructuring Plan          
Restructuring Cost and Reserve [Line Items]          
Restructuring and impairment costs 27   76   $ 242
Restructuring and Related Cost, Total Expected Cost 385   385    
Restructuring and Related Cost, Cost Incurred to Date 318   318    
Payments for Restructuring     (65)   (79)
Restructuring Reserve, Settled without Cash     (4)   (98)
Currency Translation     (1)    
Restructuring Reserve 71   71   65
2021 Restructuring Plan | Employee Severance          
Restructuring Cost and Reserve [Line Items]          
Restructuring and impairment costs     37   68
Payments for Restructuring     (40)   (28)
Restructuring Reserve, Settled without Cash     0   0
Currency Translation     (1)    
Restructuring Reserve 36   36   40
2021 Restructuring Plan | Long-Lived Asset Impairment          
Restructuring Cost and Reserve [Line Items]          
Restructuring and impairment costs     4   98
Payments for Restructuring     0   0
Restructuring Reserve, Settled without Cash     (4)   (98)
Currency Translation     0    
Restructuring Reserve 0   0   0
2021 Restructuring Plan | Other Restructuring          
Restructuring Cost and Reserve [Line Items]          
Restructuring and impairment costs     35   76
Payments for Restructuring     (25)   (51)
Restructuring Reserve, Settled without Cash     0   0
Currency Translation     0    
Restructuring Reserve 35   35   $ 25
2021 Restructuring Plan | Building Solutions North America          
Restructuring Cost and Reserve [Line Items]          
Restructuring and impairment costs     13    
Restructuring and Related Cost, Cost Incurred to Date 83   83    
2021 Restructuring Plan | Building Solutions EMEA/LA          
Restructuring Cost and Reserve [Line Items]          
Restructuring and impairment costs     10    
Restructuring and Related Cost, Cost Incurred to Date 39   39    
2021 Restructuring Plan | Building Solutions Asia Pacific          
Restructuring Cost and Reserve [Line Items]          
Restructuring and impairment costs     11    
Restructuring and Related Cost, Cost Incurred to Date 39   39    
2021 Restructuring Plan | Global Products          
Restructuring Cost and Reserve [Line Items]          
Restructuring and impairment costs     39    
Restructuring and Related Cost, Cost Incurred to Date 130   130    
2021 Restructuring Plan | Corporate Segment          
Restructuring Cost and Reserve [Line Items]          
Restructuring and impairment costs     3    
Restructuring and Related Cost, Cost Incurred to Date $ 27   $ 27