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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2023 | Mar. 31, 2022
Disaggregation of Revenue [Line Items] |  |  |  |
Total | $ 6,686 | $ 6,098 | $ 12,754 | $ 11,960
Products and systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 5,083 | 4,617 | 9,639 | 9,037
Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 1,603 | 1,481 | 3,115 | 2,923
Building Solutions North America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 2,520 | 2,227 | 4,887 | 4,379
Building Solutions North America | Products and systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 1,554 | 1,343 | 3,005 | 2,642
Building Solutions North America | Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 966 | 884 | 1,882 | 1,737
Building Solutions EMEA/LA |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 1,031 | 958 | 2,006 | 1,917
Building Solutions EMEA/LA | Products and systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 582 | 536 | 1,134 | 1,080
Building Solutions EMEA/LA | Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 449 | 422 | 872 | 837
Building Solutions Asia Pacific |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 667 | 623 | 1,313 | 1,298
Building Solutions Asia Pacific | Products and systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 479 | 448 | 952 | 949
Building Solutions Asia Pacific | Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 188 | 175 | 361 | 349
Global Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 2,468 | 2,290 | 4,548 | 4,366
Global Products | Products and systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 2,468 | 2,290 | 4,548 | 4,366
Global Products | HVAC |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 1,757 | 1,658 | 3,197 | 3,141
Global Products | Fire & Security |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 623 | 578 | 1,193 | 1,122
Global Products | Industrial Refrigeration |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 88 | 54 | 158 | 103
Global Products | Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | $ 0 | $ 0 | $ 0 | $ 0

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