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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Disaggregation of Revenue [Line Items] |  |
Total | $ 6,094 | $ 6,068
Products and systems |  |
Disaggregation of Revenue [Line Items] |  |
Total | 4,489 | 4,556
Services |  |
Disaggregation of Revenue [Line Items] |  |
Total | 1,605 | 1,512
Building Solutions North America |  |
Disaggregation of Revenue [Line Items] |  |
Total | 2,487 | 2,367
Building Solutions North America | Products and systems |  |
Disaggregation of Revenue [Line Items] |  |
Total | 1,518 | 1,451
Building Solutions North America | Services |  |
Disaggregation of Revenue [Line Items] |  |
Total | 969 | 916
Building Solutions EMEA/LA |  |
Disaggregation of Revenue [Line Items] |  |
Total | 1,038 | 975
Building Solutions EMEA/LA | Products and systems |  |
Disaggregation of Revenue [Line Items] |  |
Total | 572 | 552
Building Solutions EMEA/LA | Services |  |
Disaggregation of Revenue [Line Items] |  |
Total | 466 | 423
Building Solutions Asia Pacific |  |
Disaggregation of Revenue [Line Items] |  |
Total | 507 | 646
Building Solutions Asia Pacific | Products and systems |  |
Disaggregation of Revenue [Line Items] |  |
Total | 337 | 473
Building Solutions Asia Pacific | Services |  |
Disaggregation of Revenue [Line Items] |  |
Total | 170 | 173
Global Products |  |
Disaggregation of Revenue [Line Items] |  |
Total | 2,062 | 2,080
Global Products | Products and systems |  |
Disaggregation of Revenue [Line Items] |  |
Total | 2,062 | 2,080
Global Products | HVAC |  |
Disaggregation of Revenue [Line Items] |  |
Total | 1,418 | 1,440
Global Products | Fire & Security |  |
Disaggregation of Revenue [Line Items] |  |
Total | 547 | 570
Global Products | Industrial Refrigeration |  |
Disaggregation of Revenue [Line Items] |  |
Total | 97 | 70
Global Products | Services |  |
Disaggregation of Revenue [Line Items] |  |
Total | $ 0 | $ 0

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