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Goodwill and Other Intangible Assets - Changes in Carrying Amount of Goodwill (Details) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Goodwill [Roll Forward] |  |
Beginning Balance | $ 18,178 |
Business Acquisitions | 39 |
Currency Translation and Other | (145) |
Ending Balance | 18,072 |
Building Solutions EMEA/LA |  |
Goodwill [Roll Forward] |  |
Business Divestitures |  | $ (1)
Building Technologies & Solutions | Building Solutions North America |  |
Goodwill [Roll Forward] |  |
Beginning Balance | 9,588 |
Business Acquisitions | 0 |
Currency Translation and Other | (45) |
Ending Balance | 9,543 |
Building Technologies & Solutions | Building Solutions EMEA/LA |  |
Goodwill [Roll Forward] |  |
Beginning Balance | 1,849 |
Business Acquisitions | 20 |
Currency Translation and Other | (15) |
Ending Balance | 1,854 |
Building Technologies & Solutions | Building Solutions Asia Pacific |  |
Goodwill [Roll Forward] |  |
Beginning Balance | 1,194 |
Business Acquisitions | 0 |
Currency Translation and Other | (23) |
Ending Balance | 1,171 |
Building Technologies & Solutions | Global Products |  |
Goodwill [Roll Forward] |  |
Beginning Balance | 5,547 |
Business Acquisitions | 19 |
Currency Translation and Other | (62) |
Ending Balance | $ 5,504 |

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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- Definition Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of divestiture of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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