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Revenue Recognition Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2022 | Mar. 31, 2021
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, Net | $ 6,098 | $ 5,594 | $ 11,960 | $ 10,935
Products and Systems [Domain] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, Net | 4,617 | 4,032 | 9,037 | 7,831
Services [Domain] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, Net | 1,481 | 1,562 | 2,923 | 3,104
Building Solutions North America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, Net | 2,227 | 2,092 | 4,379 | 4,126
Building Solutions North America | Products and Systems [Domain] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, Net | 1,343 | 1,272 | 2,642 | 2,514
Building Solutions North America | Services [Domain] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, Net | 884 | 820 | 1,737 | 1,612
Building Solutions EMEA/LA |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, Net | 958 | 934 | 1,917 | 1,882
Building Solutions EMEA/LA | Products and Systems [Domain] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, Net | 536 | 466 | 1,080 | 934
Building Solutions EMEA/LA | Services [Domain] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, Net | 422 | 468 | 837 | 948
Building Solutions Asia Pacific |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, Net | 623 | 594 | 1,298 | 1,198
Building Solutions Asia Pacific | Products and Systems [Domain] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, Net | 448 | 320 | 949 | 654
Building Solutions Asia Pacific | Services [Domain] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, Net | 175 | 274 | 349 | 544
Global Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, Net | 2,290 | 1,974 | 4,366 | 3,729
Global Products | Products and Systems [Domain] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, Net | 2,290 | 1,974 | 4,366 | 3,729
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 | 1,658 | 1,374 | 3,141 | 2,592
Global Products | Global Products - Fire & Security [Domain] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, Net | 578 | 537 | 1,122 | 1,025
Global Products | Global Products - Industrial Refrigeration [Domain] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, Net | $ 54 | $ 63 | $ 103 | $ 112

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