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Goodwill and Other Intangible Assets - Changes in Carrying Amount of Goodwill (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2017
Goodwill [Roll Forward] |  |
Beginning Balance |  | $ 21,024
Business Acquisitions |  | (158)
Business Divestitures |  | (1,270)
Currency Translation and Other |  | 23
Ending Balance |  | 19,619
Building Efficiency Systems and Service North America |  |
Goodwill [Roll Forward] |  |
Business Divestitures | $ (3) |
Power Solutions |  |
Goodwill [Roll Forward] |  |
Beginning Balance |  | 1,086
Business Acquisitions |  | 0
Business Divestitures |  | 0
Currency Translation and Other |  | 0
Ending Balance |  | 1,086
Building Technologies & Solutions [Member] | Building Technologies & Solutions Tyco [Member] |  |
Goodwill [Roll Forward] |  |
Beginning Balance |  | 16,308
Business Acquisitions |  | (160)
Business Divestitures |  | (1,270)
Currency Translation and Other |  | 40
Ending Balance |  | 14,918
Building Efficiency | Building Efficiency Systems and Service North America |  |
Goodwill [Roll Forward] |  |
Beginning Balance |  | 975
Business Acquisitions |  | 0
Business Divestitures |  | 0
Currency Translation and Other |  | 0
Ending Balance |  | 975
Building Efficiency | Building Efficiency Products North America [Member] |  |
Goodwill [Roll Forward] |  |
Beginning Balance |  | 1,697
Business Acquisitions |  | 1
Business Divestitures |  | 0
Currency Translation and Other |  | 2
Ending Balance |  | 1,700
Building Efficiency | Building Efficiency Asia |  |
Goodwill [Roll Forward] |  |
Beginning Balance |  | 657
Business Acquisitions |  | 0
Business Divestitures |  | 0
Currency Translation and Other |  | (23)
Ending Balance |  | 634
Building Efficiency | Building Efficiency Rest of World [Member] |  |
Goodwill [Roll Forward] |  |
Beginning Balance |  | 301
Business Acquisitions |  | 1
Business Divestitures |  | 0
Currency Translation and Other |  | 4
Ending Balance |  | $ 306

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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