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Revenue Recognition Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, Net | $ 6,614 | $ 6,341 | $ 18,574 | $ 17,276
Products and Systems [Domain] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, Net | 5,082 | 4,700 | 14,119 | 12,531
Services [Domain] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, Net | 1,532 | 1,641 | 4,455 | 4,745
Building Solutions North America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, Net | 2,426 | 2,212 | 6,805 | 6,338
Building Solutions North America | Products and Systems [Domain] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, Net | 1,481 | 1,355 | 4,123 | 3,869
Building Solutions North America | Services [Domain] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, Net | 945 | 857 | 2,682 | 2,469
Building Solutions EMEA/LA |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, Net | 952 | 1,001 | 2,869 | 2,883
Building Solutions EMEA/LA | Products and Systems [Domain] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, Net | 537 | 507 | 1,617 | 1,441
Building Solutions EMEA/LA | Services [Domain] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, Net | 415 | 494 | 1,252 | 1,442
Building Solutions Asia Pacific |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, Net | 665 | 703 | 1,963 | 1,901
Building Solutions Asia Pacific | Products and Systems [Domain] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, Net | 493 | 413 | 1,442 | 1,067
Building Solutions Asia Pacific | Services [Domain] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, Net | 172 | 290 | 521 | 834
Global Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, Net | 2,571 | 2,425 | 6,937 | 6,154
Global Products | Products and Systems [Domain] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, Net | 2,571 | 2,425 | 6,937 | 6,154
Global Products | Services [Domain] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, Net | 0 | 0 | 0 | 0
Global Products | Global Products - HVAC [Domain] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, Net | 1,889 | 1,781 | 5,030 | 4,373
Global Products | Global Products - Fire & Security [Domain] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, Net | 610 | 580 | 1,732 | 1,605
Global Products | Global Products - Industrial Refrigeration [Domain] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, Net | $ 72 | $ 64 | $ 175 | $ 176

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