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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Disaggregation of Revenue [Line Items]        
Total $ 7,133 $ 6,614 $ 19,887 $ 18,574
Products and systems        
Disaggregation of Revenue [Line Items]        
Total 5,431 5,082 15,070 14,119
Services        
Disaggregation of Revenue [Line Items]        
Total 1,702 1,532 4,817 4,455
Building Solutions North America        
Disaggregation of Revenue [Line Items]        
Total 2,665 2,426 7,552 6,805
Building Solutions North America | Products and systems        
Disaggregation of Revenue [Line Items]        
Total 1,636 1,481 4,641 4,123
Building Solutions North America | Services        
Disaggregation of Revenue [Line Items]        
Total 1,029 945 2,911 2,682
Building Solutions EMEA/LA        
Disaggregation of Revenue [Line Items]        
Total 1,045 952 3,051 2,869
Building Solutions EMEA/LA | Products and systems        
Disaggregation of Revenue [Line Items]        
Total 571 537 1,705 1,617
Building Solutions EMEA/LA | Services        
Disaggregation of Revenue [Line Items]        
Total 474 415 1,346 1,252
Building Solutions Asia Pacific        
Disaggregation of Revenue [Line Items]        
Total 736 665 2,049 1,963
Building Solutions Asia Pacific | Products and systems        
Disaggregation of Revenue [Line Items]        
Total 537 493 1,489 1,442
Building Solutions Asia Pacific | Services        
Disaggregation of Revenue [Line Items]        
Total 199 172 560 521
Global Products        
Disaggregation of Revenue [Line Items]        
Total 2,687 2,571 7,235 6,937
Global Products | Products and systems        
Disaggregation of Revenue [Line Items]        
Total 2,687 2,571 7,235 6,937
Global Products | HVAC        
Disaggregation of Revenue [Line Items]        
Total 1,973 1,889 5,170 5,030
Global Products | Fire & Security        
Disaggregation of Revenue [Line Items]        
Total 626 610 1,819 1,732
Global Products | Industrial Refrigeration        
Disaggregation of Revenue [Line Items]        
Total 88 72 246 175
Global Products | Services        
Disaggregation of Revenue [Line Items]        
Total $ 0 $ 0 $ 0 $ 0