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Acquisitions and Divestitures Divestitures (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019 | Jun. 30, 2019
Divestitures [Line Items] |  |  |  |
Business divestitures, net of cash divested | $ 19 | $ 135 | $ 12 |
Goodwill, written off related to divestiture | 7 | 11 |  |
Business Divestitures, Not Specific |  |  |  |
Divestitures [Line Items] |  |  |  |
Disposal Group, Including Discontinued Operation, Consideration |  | 152 | 18 |
Business divestitures, net of cash divested |  | 135 | 16 |
Business Divestitures, Not Specific | Building Solutions Asia Pacific |  |  |  |
Divestitures [Line Items] |  |  |  |
Disposal Group, Including Discontinued Operation, Consideration | 27 |  |  |
Business divestitures, net of cash divested | 19 |  |  |
Goodwill, written off related to divestiture | $ 7 | $ 11 |  |
Business Divestitures, Not Specific | Building Solutions EMEA/LA |  |  |  |
Divestitures [Line Items] |  |  |  |
Goodwill, written off related to divestiture |  |  | 1 |
Power Solutions |  |  |  |
Divestitures [Line Items] |  |  |  |
Disposal Group, Including Discontinued Operation, Consideration |  |  | 13,200 |
Disposal Group, Discontinued Operations, Consideration, net |  |  | 11,600 | $ 11,600
Discontinued Operation, Gain from Disposal of Discontinued Operation, before Income Tax |  |  | 5,200 |
Discontinued Operation, Gain on Disposal of Discontinued Operation, Net of Tax |  |  | $ 4,000 |

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