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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Disaggregation of Revenue [Line Items]      
Total $ 22,952 $ 22,331 $ 20,637
Building Solutions North America      
Disaggregation of Revenue [Line Items]      
Total 11,348 10,330  
Building Solutions EMEA/LA      
Disaggregation of Revenue [Line Items]      
Total 4,296 4,096  
Building Solutions Asia Pacific      
Disaggregation of Revenue [Line Items]      
Total 2,237 2,746  
Global Products      
Disaggregation of Revenue [Line Items]      
Total 5,071 5,159  
Products and systems      
Disaggregation of Revenue [Line Items]      
Total 15,967 15,789 14,612
Products and systems | Building Solutions North America      
Disaggregation of Revenue [Line Items]      
Total 7,099 6,368  
Products and systems | Building Solutions EMEA/LA      
Disaggregation of Revenue [Line Items]      
Total 2,314 2,275  
Products and systems | Building Solutions Asia Pacific      
Disaggregation of Revenue [Line Items]      
Total 1,483 1,987  
Products and systems | Global Products      
Disaggregation of Revenue [Line Items]      
Total 5,071 5,159  
HVAC | Global Products      
Disaggregation of Revenue [Line Items]      
Total 2,280 2,358  
Fire & Security | Global Products      
Disaggregation of Revenue [Line Items]      
Total 2,370 2,446  
Industrial Refrigeration | Global Products      
Disaggregation of Revenue [Line Items]      
Total 421 355  
Services      
Disaggregation of Revenue [Line Items]      
Total 6,985 6,542 $ 6,025
Services | Building Solutions North America      
Disaggregation of Revenue [Line Items]      
Total 4,249 3,962  
Services | Building Solutions EMEA/LA      
Disaggregation of Revenue [Line Items]      
Total 1,982 1,821  
Services | Building Solutions Asia Pacific      
Disaggregation of Revenue [Line Items]      
Total 754 759  
Services | Global Products      
Disaggregation of Revenue [Line Items]      
Total $ 0 $ 0