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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Disaggregation of Revenue [Line Items]        
Total $ 6,699 $ 6,686 $ 12,793 $ 12,754
Products and systems        
Disaggregation of Revenue [Line Items]        
Total 4,985 5,083 9,474 9,639
Services        
Disaggregation of Revenue [Line Items]        
Total 1,714 1,603 3,319 3,115
Building Solutions North America        
Disaggregation of Revenue [Line Items]        
Total 2,739 2,520 5,226 4,887
Building Solutions North America | Products and systems        
Disaggregation of Revenue [Line Items]        
Total 1,700 1,554 3,218 3,005
Building Solutions North America | Services        
Disaggregation of Revenue [Line Items]        
Total 1,039 966 2,008 1,882
Building Solutions EMEA/LA        
Disaggregation of Revenue [Line Items]        
Total 1,064 1,031 2,102 2,006
Building Solutions EMEA/LA | Products and systems        
Disaggregation of Revenue [Line Items]        
Total 572 582 1,144 1,134
Building Solutions EMEA/LA | Services        
Disaggregation of Revenue [Line Items]        
Total 492 449 958 872
Building Solutions Asia Pacific        
Disaggregation of Revenue [Line Items]        
Total 491 667 998 1,313
Building Solutions Asia Pacific | Products and systems        
Disaggregation of Revenue [Line Items]        
Total 308 479 645 952
Building Solutions Asia Pacific | Services        
Disaggregation of Revenue [Line Items]        
Total 183 188 353 361
Global Products        
Disaggregation of Revenue [Line Items]        
Total 2,405 2,468 4,467 4,548
Global Products | Products and systems        
Disaggregation of Revenue [Line Items]        
Total 2,405 2,468 4,467 4,548
Global Products | HVAC        
Disaggregation of Revenue [Line Items]        
Total 1,683 1,757 3,101 3,197
Global Products | Fire & Security        
Disaggregation of Revenue [Line Items]        
Total 607 623 1,154 1,193
Global Products | Industrial Refrigeration        
Disaggregation of Revenue [Line Items]        
Total 115 88 212 158
Global Products | Services        
Disaggregation of Revenue [Line Items]        
Total $ 0 $ 0 $ 0 $ 0