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Goodwill and Other Intangible Assets Changes in Carrying Amount of Goodwill (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2016 | Sep. 30, 2018 | Sep. 30, 2017
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning Balance |  | $ 19,688 | $ 21,024
Business Acquisitions |  | 15 | (256)
Business Divestitures |  | (35) | (1,269)
Currency Translation and Other |  | (195) | 189
Goodwill, Ending Balance |  | 19,473 | 19,688
Power Solutions |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning Balance |  | 1,097 | 1,086
Business Acquisitions |  | 0 | 0
Business Divestitures |  | 0 | 0
Currency Translation and Other |  | (5) | 11
Goodwill, Ending Balance |  | 1,092 | 1,097
Building Solutions North America |  |  |
Goodwill [Roll Forward] |  |  |
Business Divestitures | $ (3) |  |
Building Solutions North America | Building Technologies & Solutions |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning Balance |  | 9,637 | 9,734
Business Acquisitions |  | 0 | (147)
Business Divestitures |  | 0 | 0
Currency Translation and Other |  | (34) | 50
Goodwill, Ending Balance |  | 9,603 | 9,637
Building Solutions EMEA/LA | Building Technologies & Solutions |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning Balance |  | 2,012 | 1,981
Business Acquisitions |  | 1 | (37)
Business Divestitures |  | 0 | 0
Currency Translation and Other |  | (63) | 68
Goodwill, Ending Balance |  | 1,950 | 2,012
Building Solutions Asia Pacific | Building Technologies & Solutions |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning Balance |  | 1,255 | 1,260
Business Acquisitions |  | 0 | (14)
Business Divestitures |  | 0 | (2)
Currency Translation and Other |  | (20) | 11
Goodwill, Ending Balance |  | 1,235 | 1,255
Global Products | Building Technologies & Solutions |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning Balance |  | 5,687 | 6,963
Business Acquisitions |  | 14 | (58)
Business Divestitures |  | (35) | (1,267)
Currency Translation and Other |  | (73) | 49
Goodwill, Ending Balance |  | $ 5,593 | $ 5,687

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