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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Disaggregation of Revenue [Line Items]      
Total $ 26,793 $ 25,299 $ 23,668
Building Solutions North America      
Disaggregation of Revenue [Line Items]      
Total 10,330 9,367  
Building Solutions EMEA/LA      
Disaggregation of Revenue [Line Items]      
Total 4,096 3,845  
Building Solutions Asia Pacific      
Disaggregation of Revenue [Line Items]      
Total 2,746 2,714  
Global Products      
Disaggregation of Revenue [Line Items]      
Total 9,621 9,373  
Products and systems      
Disaggregation of Revenue [Line Items]      
Total 20,251 19,274 17,202
Products and systems | Building Solutions North America      
Disaggregation of Revenue [Line Items]      
Total 6,368 5,708  
Products and systems | Building Solutions EMEA/LA      
Disaggregation of Revenue [Line Items]      
Total 2,275 2,188  
Products and systems | Building Solutions Asia Pacific      
Disaggregation of Revenue [Line Items]      
Total 1,987 2,005  
Products and systems | Global Products      
Disaggregation of Revenue [Line Items]      
Total 9,621 9,373  
HVAC | Global Products      
Disaggregation of Revenue [Line Items]      
Total 6,820 6,756  
Fire & Security | Global Products      
Disaggregation of Revenue [Line Items]      
Total 2,446 2,367  
Industrial Refrigeration | Global Products      
Disaggregation of Revenue [Line Items]      
Total 355 250  
Services      
Disaggregation of Revenue [Line Items]      
Total 6,542 6,025 $ 6,466
Services | Building Solutions North America      
Disaggregation of Revenue [Line Items]      
Total 3,962 3,659  
Services | Building Solutions EMEA/LA      
Disaggregation of Revenue [Line Items]      
Total 1,821 1,657  
Services | Building Solutions Asia Pacific      
Disaggregation of Revenue [Line Items]      
Total 759 709  
Services | Global Products      
Disaggregation of Revenue [Line Items]      
Total $ 0 $ 0