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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2025 | Mar. 31, 2024
Disaggregation of Revenue [Line Items] |  |  |  |
Total | $ 5,676 | $ 5,597 | $ 11,102 | $ 10,806
Products and systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 3,865 | 3,883 | 7,550 | 7,487
Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 1,811 | 1,714 | 3,552 | 3,319
Building Solutions North America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 2,916 | 2,739 | 5,660 | 5,226
Building Solutions North America | Products and systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 1,829 | 1,700 | 3,524 | 3,218
Building Solutions North America | Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 1,087 | 1,039 | 2,136 | 2,008
Building Solutions EMEA/LA |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 1,085 | 1,064 | 2,158 | 2,102
Building Solutions EMEA/LA | Products and systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 566 | 572 | 1,140 | 1,144
Building Solutions EMEA/LA | Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 519 | 492 | 1,018 | 958
Building Solutions Asia Pacific |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 542 | 491 | 1,069 | 998
Building Solutions Asia Pacific | Products and systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 337 | 308 | 671 | 645
Building Solutions Asia Pacific | Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 205 | 183 | 398 | 353
Global Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 1,133 | 1,303 | 2,215 | 2,480
Global Products | Products and systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 1,133 | 1,303 | 2,215 | 2,480
Global Products | HVAC |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 468 | 581 | 936 | 1,114
Global Products | Fire & Security |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 573 | 607 | 1,095 | 1,154
Global Products | Industrial Refrigeration |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | 92 | 115 | 184 | 212
Global Products | Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total | $ 0 | $ 0 | $ 0 | $ 0

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