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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Disaggregation of Revenue [Line Items]      
Total $ 25,299 $ 23,668 $ 22,317
Building Solutions North America      
Disaggregation of Revenue [Line Items]      
Total 9,367 8,685  
Building Solutions EMEA/LA      
Disaggregation of Revenue [Line Items]      
Total 3,845 3,884  
Building Solutions Asia Pacific      
Disaggregation of Revenue [Line Items]      
Total 2,714 2,616  
Global Products      
Disaggregation of Revenue [Line Items]      
Total 9,373 8,483  
Products and systems      
Disaggregation of Revenue [Line Items]      
Total 19,274 17,202 16,253
Products and systems | Building Solutions North America      
Disaggregation of Revenue [Line Items]      
Total 5,708 5,312  
Products and systems | Building Solutions EMEA/LA      
Disaggregation of Revenue [Line Items]      
Total 2,188 1,929  
Products and systems | Building Solutions Asia Pacific      
Disaggregation of Revenue [Line Items]      
Total 2,005 1,478  
Products and systems | Global Products      
Disaggregation of Revenue [Line Items]      
Total 9,373 8,483  
HVAC | Global Products      
Disaggregation of Revenue [Line Items]      
Total 6,756 6,054  
Fire & Security | Global Products      
Disaggregation of Revenue [Line Items]      
Total 2,367 2,192  
Industrial Refrigeration | Global Products      
Disaggregation of Revenue [Line Items]      
Total 250 237  
Services      
Disaggregation of Revenue [Line Items]      
Total 6,025 6,466 $ 6,064
Services | Building Solutions North America      
Disaggregation of Revenue [Line Items]      
Total 3,659 3,373  
Services | Building Solutions EMEA/LA      
Disaggregation of Revenue [Line Items]      
Total 1,657 1,955  
Services | Building Solutions Asia Pacific      
Disaggregation of Revenue [Line Items]      
Total 709 1,138  
Services | Global Products      
Disaggregation of Revenue [Line Items]      
Total $ 0 $ 0