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Goodwill and Other Intangible Assets Goodwill Additional Information (Details) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Sep. 02, 2016 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Goodwill [Line Items] |  |  |  |
Goodwill, acquired during period |  | $ 15,000,000 | $ (256,000,000) |
Goodwill, written off related to divestiture |  | 35,000,000 | 1,269,000,000 |
Goodwill |  | 19,473,000,000 | 19,688,000,000 | $ 21,024,000,000
Building Solutions EMEA/LA |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, Impaired, Accumulated Impairment Loss |  |  |  | 47,000,000
Building Technologies & Solutions | Global Products |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, acquired during period |  | 14,000,000 | (58,000,000) |
Goodwill, written off related to divestiture |  | 35,000,000 | 1,267,000,000 |
Goodwill |  | 5,593,000,000 | 5,687,000,000 | 6,963,000,000
Building Technologies & Solutions | Building Solutions EMEA/LA |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, acquired during period |  | 1,000,000 | (37,000,000) |
Goodwill, written off related to divestiture |  | 0 | 0 |
Goodwill |  | 1,950,000,000 | 2,012,000,000 | $ 1,981,000,000
Latin America [Member] | Building Solutions EMEA/LA |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill |  | $ 0 |  |
Tyco merger [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, acquired during period | $ 16,105,000,000 |  |  |
Scott Safety business [Member] | Building Technologies & Solutions | Global Products |  |  |  |
Goodwill [Line Items] |  |  |  |
Sales Price of Business Divestitures |  |  | $ 1,248,000,000 |

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