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Goodwill and Other Intangible Assets - Narrative (Details) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 USD ($) | Mar. 31, 2024 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) reportingUnits | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Jul. 31, 2024 USD ($)
Intangible Assets [Line Items] |  |  |  |  |  |  |
Reporting units excluded | reportingUnits |  |  |  | 1 |  |  |
Reporting units | reportingUnits |  |  |  | 1 |  |  |
Goodwill | $ 16,725,000,000 |  | $ 16,772,000,000 | $ 16,725,000,000 | $ 16,772,000,000 | $ 16,175,000,000 |
Goodwill impairment loss |  | $ 230,000,000 |  | 230,000,000 | 184,000,000 |  |
Impairment, Intangible Asset, Finite-Lived, Statement of Income or Comprehensive Income [Extensible Enumeration] | Additional restructuring and related costs |  |  |  |  |  |
Indefinite-lived trademarks |  |  |  |  |  |  | $ 335,000,000
Amortization of intangible assets |  |  |  | 476,000,000 | 426,000,000 | 413,000,000 |
Global Products |  |  |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |  |  |
Impairment of intangible assets, finite-lived | $ 32,000,000 |  |  |  |  |  |
Impairment of intangible assets, indefinite-lived |  |  | 18,000,000 |  |  |  |
Building Solutions Asia Pacific |  |  |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |  |  |
Goodwill | 1,227,000,000 |  | 1,179,000,000 | 1,227,000,000 | 1,179,000,000 | 1,116,000,000 |
Goodwill impairment loss |  |  |  | 0 | 0 |  |
Impairment of intangible assets, finite-lived | 13,000,000 |  |  |  |  |  |
Impairment of intangible assets, indefinite-lived |  |  | 10,000,000 |  |  |  |
Building Solutions North America |  |  |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |  |  |
Goodwill | 9,391,000,000 |  | 9,381,000,000 | 9,391,000,000 | 9,381,000,000 | 8,971,000,000 |
Goodwill impairment loss |  |  |  | 0 | 0 |  |
Silent-Aire |  |  |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |  |  |
Goodwill | 0 |  | 0 | 0 | 0 |  |
Goodwill impairment loss |  |  |  |  | 184,000,000 | 75,000,000 |
North America Retail |  |  |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |  |  |
Goodwill | $ 0 |  | $ 0 | $ 0 | $ 0 |  |
Goodwill impairment loss |  |  |  |  |  | $ 235,000,000 |
Reporting Unit With Quantitative Goodwill Impairment Test |  |  |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | $ 214,000,000
Reporting Unit With Quantitative Goodwill Impairment Test | Measurement Input, Discount Rate |  |  |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |  |  |
Increase (decrease) in measurement input |  |  |  |  |  |  | 2.00%
Reporting Unit With Quantitative Goodwill Impairment Test | Measurement Input, Long-Term Revenue Growth Rate |  |  |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |  |  |
Increase (decrease) in measurement input |  |  |  |  |  |  | 2.00%

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