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Segment Information Financial Information Related to Company's Reportable Segments (Additional Information) (Details) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2018 USD ($) Segment | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($)
Segment Information [Line Items] |  |  |
Number of reportable segments | Segment | 5 |  |
Restructuring and impairment costs | $ 263 | $ 367 | $ 288
Equity income in segment income | 235 | 240 | 174
Gain (loss) on business divestitures - net | 114 | 0 | 0
Power Solutions |  |  |
Segment Information [Line Items] |  |  |
Restructuring and impairment costs | 8 | 20 | 66
Equity income in segment income | 58 | 83 | 48
Equity Method Investments | 453 | 447 | 367
Building Solutions North America |  |  |
Segment Information [Line Items] |  |  |
Equity Method Investments | 8 | 8 | 7
Building Solutions North America | Building Technologies & Solutions |  |  |
Segment Information [Line Items] |  |  |
Restructuring and impairment costs | 20 | 59 |
Global Products |  |  |
Segment Information [Line Items] |  |  |
Equity Method Investments | 740 | 629 | 513
Global Products | Building Technologies & Solutions |  |  |
Segment Information [Line Items] |  |  |
Restructuring and impairment costs | 113 | 32 | 44
Equity income in segment income | 175 | 151 | 114
Building Solutions EMEA/LA |  |  |
Segment Information [Line Items] |  |  |
Equity Method Investments | 99 | 107 | 103
Building Solutions EMEA/LA | Building Technologies & Solutions |  |  |
Segment Information [Line Items] |  |  |
Restructuring and impairment costs | 56 | 74 | 17
Equity income in segment income | 1 | 5 | 11
Building Solutions Asia Pacific |  |  |
Segment Information [Line Items] |  |  |
Equity Method Investments | 1 |  |
Building Solutions Asia Pacific | Building Technologies & Solutions |  |  |
Segment Information [Line Items] |  |  |
Restructuring and impairment costs | 16 | 16 |
Equity income in segment income | $ 1 | $ 1 | $ 1

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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66022249&loc=d3e33749-111570 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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