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Revenue Recognition Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Disaggregation of Revenue [Line Items] |  |
Revenue, Net | $ 5,341 | $ 5,576
Products and Systems [Domain] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue, Net | 3,799 | 4,036
Services [Domain] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue, Net | 1,542 | 1,540
Building Solutions North America |  |
Disaggregation of Revenue [Line Items] |  |
Revenue, Net | 2,034 | 2,167
Building Solutions North America | Products and Systems [Domain] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue, Net | 1,242 | 1,356
Building Solutions North America | Services [Domain] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue, Net | 792 | 811
Building Solutions EMEA/LA |  |
Disaggregation of Revenue [Line Items] |  |
Revenue, Net | 906 | 928
Building Solutions EMEA/LA | Products and Systems [Domain] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue, Net | 426 | 457
Building Solutions EMEA/LA | Services [Domain] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue, Net | 480 | 471
Building Solutions Asia Pacific |  |
Disaggregation of Revenue [Line Items] |  |
Revenue, Net | 615 | 629
Building Solutions Asia Pacific | Products and Systems [Domain] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue, Net | 345 | 371
Building Solutions Asia Pacific | Services [Domain] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue, Net | 270 | 258
Global Products |  |
Disaggregation of Revenue [Line Items] |  |
Revenue, Net | 1,786 | 1,852
Global Products | Global Products - HVAC [Domain] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue, Net | 1,249 | 1,300
Global Products | Global Products - Fire & Security [Domain] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue, Net | 488 | 492
Global Products | Global Products - Industrial Refrigeration [Domain] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue, Net | 49 | 60
Global Products | Products and Systems [Domain] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue, Net | 1,786 | 1,852
Global Products | Services [Domain] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue, Net | $ 0 | $ 0

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9031-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130543-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130545-203045 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 + Details
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