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Goodwill and Other Intangible Assets Goodwill Additional Information (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Goodwill [Line Items] |  |  |  |
Goodwill impairment loss |  | $ 0 | $ 424 |
Goodwill |  | 18,335 | 17,932 | $ 18,178
Building Solutions EMEA/LA - Latin America |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, Impaired, Accumulated Impairment Loss |  |  |  | 47
Building Solutions North America |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill impairment loss |  |  | 424 |
Building Solutions North America | North America Retail [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill |  | 235 |  |
Building Technologies & Solutions | Global Products |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill impairment loss |  | 0 | 0 |
Goodwill |  | 5,859 | 5,579 | 5,547
Building Technologies & Solutions | Building Solutions EMEA/LA |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill impairment loss |  | 0 | 0 |
Goodwill |  | 2,021 | 1,967 | 1,849
Building Technologies & Solutions | Building Solutions North America |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill impairment loss | $ 424 | 0 | 424 |
Goodwill |  | $ 9,215 | $ 9,160 | $ 9,588

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