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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Disaggregation of Revenue [Line Items]        
Total $ 7,231 $ 7,133 $ 20,024 $ 19,887
Products and systems        
Disaggregation of Revenue [Line Items]        
Total 5,422 5,431 14,896 15,070
Services        
Disaggregation of Revenue [Line Items]        
Total 1,809 1,702 5,128 4,817
Building Solutions North America        
Disaggregation of Revenue [Line Items]        
Total 2,899 2,665 8,125 7,552
Building Solutions North America | Products and systems        
Disaggregation of Revenue [Line Items]        
Total 1,791 1,636 5,009 4,641
Building Solutions North America | Services        
Disaggregation of Revenue [Line Items]        
Total 1,108 1,029 3,116 2,911
Building Solutions EMEA/LA        
Disaggregation of Revenue [Line Items]        
Total 1,081 1,045 3,183 3,051
Building Solutions EMEA/LA | Products and systems        
Disaggregation of Revenue [Line Items]        
Total 574 571 1,718 1,705
Building Solutions EMEA/LA | Services        
Disaggregation of Revenue [Line Items]        
Total 507 474 1,465 1,346
Building Solutions Asia Pacific        
Disaggregation of Revenue [Line Items]        
Total 575 736 1,573 2,049
Building Solutions Asia Pacific | Products and systems        
Disaggregation of Revenue [Line Items]        
Total 381 537 1,026 1,489
Building Solutions Asia Pacific | Services        
Disaggregation of Revenue [Line Items]        
Total 194 199 547 560
Global Products        
Disaggregation of Revenue [Line Items]        
Total 2,676 2,687 7,143 7,235
Global Products | Products and systems        
Disaggregation of Revenue [Line Items]        
Total 2,676 2,687 7,143 7,235
Global Products | HVAC        
Disaggregation of Revenue [Line Items]        
Total 1,971 1,973 5,072 5,170
Global Products | Fire & Security        
Disaggregation of Revenue [Line Items]        
Total 601 626 1,755 1,819
Global Products | Industrial Refrigeration        
Disaggregation of Revenue [Line Items]        
Total 104 88 316 246
Global Products | Services        
Disaggregation of Revenue [Line Items]        
Total $ 0 $ 0 $ 0 $ 0