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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Disaggregation of Revenue [Line Items] |  |
Total | $ 5,426 | $ 5,209
Products and systems |  |
Disaggregation of Revenue [Line Items] |  |
Total | 3,685 | 3,604
Services |  |
Disaggregation of Revenue [Line Items] |  |
Total | 1,741 | 1,605
Building Solutions North America |  |
Disaggregation of Revenue [Line Items] |  |
Total | 2,744 | 2,487
Building Solutions North America | Products and systems |  |
Disaggregation of Revenue [Line Items] |  |
Total | 1,695 | 1,518
Building Solutions North America | Services |  |
Disaggregation of Revenue [Line Items] |  |
Total | 1,049 | 969
Building Solutions EMEA/LA |  |
Disaggregation of Revenue [Line Items] |  |
Total | 1,073 | 1,038
Building Solutions EMEA/LA | Products and systems |  |
Disaggregation of Revenue [Line Items] |  |
Total | 574 | 572
Building Solutions EMEA/LA | Services |  |
Disaggregation of Revenue [Line Items] |  |
Total | 499 | 466
Building Solutions Asia Pacific |  |
Disaggregation of Revenue [Line Items] |  |
Total | 527 | 507
Building Solutions Asia Pacific | Products and systems |  |
Disaggregation of Revenue [Line Items] |  |
Total | 334 | 337
Building Solutions Asia Pacific | Services |  |
Disaggregation of Revenue [Line Items] |  |
Total | 193 | 170
Global Products |  |
Disaggregation of Revenue [Line Items] |  |
Total | 1,082 | 1,177
Global Products | Products and systems |  |
Disaggregation of Revenue [Line Items] |  |
Total | 1,082 | 1,177
Global Products | HVAC |  |
Disaggregation of Revenue [Line Items] |  |
Total | 468 | 533
Global Products | Fire & Security |  |
Disaggregation of Revenue [Line Items] |  |
Total | 522 | 547
Global Products | Industrial Refrigeration |  |
Disaggregation of Revenue [Line Items] |  |
Total | 92 | 97
Global Products | Services |  |
Disaggregation of Revenue [Line Items] |  |
Total | $ 0 | $ 0

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