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Goodwill and Other Intangible Assets Changes in Carrying Amount of Goodwill (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning Balance | $ 18,178 | $ 17,932 | $ 18,178
Business Acquisitions |  | 300 | 56
Business Divestitures |  | (7) | (11)
Impairments |  | 0 | (424)
Currency Translation and Other |  | 110 | 133
Goodwill, Ending Balance |  | 18,335 | 17,932
Building Solutions North America |  |  |
Goodwill [Roll Forward] |  |  |
Impairments |  |  | (424)
Building Solutions North America | Building Technologies & Solutions |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning Balance | 9,588 | 9,160 | 9,588
Business Acquisitions |  | 21 | 0
Business Divestitures |  | 0 | 0
Impairments | (424) | 0 | (424)
Currency Translation and Other |  | 34 | (4)
Goodwill, Ending Balance |  | 9,215 | 9,160
Building Solutions EMEA/LA | Building Technologies & Solutions |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning Balance | 1,849 | 1,967 | 1,849
Business Acquisitions |  | 35 | 35
Business Divestitures |  | 0 | 0
Impairments |  | 0 | 0
Currency Translation and Other |  | 19 | 83
Goodwill, Ending Balance |  | 2,021 | 1,967
Building Solutions Asia Pacific | Building Technologies & Solutions |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning Balance | 1,194 | 1,226 | 1,194
Business Acquisitions |  | 0 | 0
Business Divestitures |  | (7) | (11)
Impairments |  | 0 | 0
Currency Translation and Other |  | 21 | 43
Goodwill, Ending Balance |  | 1,240 | 1,226
Global Products | Building Technologies & Solutions |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning Balance | $ 5,547 | 5,579 | 5,547
Business Acquisitions |  | 244 | 21
Business Divestitures |  | 0 | 0
Impairments |  | 0 | 0
Currency Translation and Other |  | 36 | 11
Goodwill, Ending Balance |  | $ 5,859 | $ 5,579

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