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Goodwill and Other Intangible Assets - Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2022 | Mar. 31, 2022 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Intangible Assets [Line Items] |  |  |  |  |  |  |
Goodwill, impaired, accumulated impairment loss | $ 781,000,000 |  |  |  | $ 781,000,000 | $ 471,000,000 | $ 471,000,000
Goodwill impairment loss |  |  |  |  | 310,000,000 | 0 | 0
Goodwill | 17,328,000,000 |  |  |  | 17,328,000,000 | 18,335,000,000 | 17,932,000,000
Impairment of intangible assets, indefinite-lived |  |  |  | $ 62,000,000 | 0 | 0 | 0
Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill), Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  |  | Restructuring and impairment costs |  |  |
Amortization of intangible assets |  |  |  |  | 427,000,000 | 435,000,000 | 386,000,000
Building Solutions North America |  |  |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |  |  |
Goodwill, impaired, accumulated impairment loss | 659,000,000 |  |  |  | 659,000,000 | 424,000,000 | 424,000,000
Goodwill impairment loss |  |  |  |  | 235,000,000 | 0 |
Goodwill | 8,971,000,000 |  |  |  | 8,971,000,000 | 9,215,000,000 | 9,160,000,000
Global Products |  |  |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |  |  |
Goodwill, impaired, accumulated impairment loss | 75,000,000 |  |  |  | 75,000,000 |  |
Goodwill impairment loss |  |  |  |  | 75,000,000 | 0 |
Goodwill | 5,516,000,000 |  |  |  | 5,516,000,000 | 5,842,000,000 | 5,562,000,000
Building Solutions EMEA/LA |  |  |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |  |  |
Goodwill, impaired, accumulated impairment loss | 47,000,000 |  |  |  | 47,000,000 | 47,000,000 | 47,000,000
Goodwill impairment loss |  |  |  |  | 0 | 0 |
Goodwill | 1,725,000,000 |  |  |  | 1,725,000,000 | 2,041,000,000 | $ 1,987,000,000
Silent-Aire |  |  |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |  |  |
Goodwill impairment loss | 75,000,000 |  |  |  |  |  |
Goodwill | 183,000,000 |  |  |  | 183,000,000 |  |
North America Retail |  |  |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |  |  |
Goodwill impairment loss |  | $ 235,000,000 | $ 424,000,000 |  |  |  |
Goodwill | 0 |  |  |  | 0 | $ 235,000,000 |
Asia Pacific Subscriber Business |  |  |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |  |  |
Indefinite-lived trademarks | $ 54,000,000 |  |  |  | $ 54,000,000 |  |

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