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Segment Information Financial Information Related to Company's Reportable Segments (Additional Information) (Details) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2019 USD ($) Segment | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($)
Segment Information [Line Items] |  |  |
Number of reportable segments | Segment | 4 |  |
Restructuring and impairment costs | $ 235 | $ 255 | $ 347
Document Period End Date | Sep. 30, 2019 |  |
Equity income in segment income | $ 192 | 177 | 157
Gain (loss) on business divestitures - net | 0 | 114 | 0
Building Solutions North America |  |  |
Segment Information [Line Items] |  |  |
Equity Method Investments | 8 | 8 | 8
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 | 730 | 740 | 629
Global Products | Building Technologies & Solutions |  |  |
Segment Information [Line Items] |  |  |
Restructuring and impairment costs | 235 | 113 | 32
Equity income in segment income | 179 | 175 | 151
Building Solutions EMEA/LA |  |  |
Segment Information [Line Items] |  |  |
Equity Method Investments | 109 | 99 | 107
Building Solutions EMEA/LA | Building Technologies & Solutions |  |  |
Segment Information [Line Items] |  |  |
Restructuring and impairment costs |  | 56 | 74
Equity income in segment income | 12 | 1 | 5
Building Solutions Asia Pacific |  |  |
Segment Information [Line Items] |  |  |
Equity Method Investments | 6 | 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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