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Goodwill and Other Intangible Assets Goodwill Additional Information (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Sep. 02, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Goodwill [Line Items] |  |  |  |
Goodwill, acquired during period |  | $ (256,000,000) | $ 16,622,000,000 |
Goodwill, written off related to divestiture |  | 1,269,000,000 | 19,000,000 |
Goodwill |  | 19,688,000,000 | 21,024,000,000 | $ 4,460,000,000
Building Technologies & Solutions | Global Products |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, acquired during period |  | (58,000,000) | 5,038,000,000 |
Goodwill, written off related to divestiture |  | 1,267,000,000 | (16,000,000) |
Goodwill |  | 5,687,000,000 | 6,963,000,000 | 1,943,000,000
Building Technologies & Solutions | Building Solutions EMEA/LA |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, acquired during period |  | (37,000,000) | 1,787,000,000 |
Goodwill, written off related to divestiture |  | 0 | 0 |
Goodwill impairment loss |  |  |  | 47,000,000
Goodwill |  | 2,012,000,000 | 1,981,000,000 | $ 195,000,000
Latin America [Member] | Building Solutions EMEA/LA |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill |  | 0 | $ 0 |
Tyco Merger [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, acquired during period | $ 16,105,000,000 | 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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