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v3.25.3

Goodwill and Other Intangible Assets - Narrative (Details) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 USD ($) | Mar. 31, 2025 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) reporting_unit | Sep. 30, 2023 USD ($) | Jul. 31, 2025 USD ($) asset
Intangible Assets [Line Items] |  |  |  |  |  |  |
Reporting units | reporting_unit |  |  |  |  | 1 |  |
Goodwill | $ 16,633 |  | $ 16,725 | $ 16,633 | $ 16,725 | $ 16,772 |
Goodwill impairment loss |  | $ 230 |  |  | 230 |  |
Goodwill, Impairment Loss, Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Restructuring and impairment costs |  |  |  |  |
Number of intangible assets with estimated fair values consistent with carrying values | asset |  |  |  |  |  |  | 2
Indefinite-lived trademarks |  |  |  |  |  |  | $ 320
Amortization of intangible assets |  |  |  | 439 | 476 | 426 |
Americas |  |  |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |  |  |
Goodwill | 13,174 |  | 13,200 | 13,174 | 13,200 | 13,172 |
Goodwill impairment loss |  |  |  |  | 0 |  |
Amortization of intangible assets |  |  |  | 356 | 379 | 337 |
Americas | Customer relationships |  |  |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |  |  |
Impairment of intangible assets, finite-lived | 59 |  |  |  |  |  |
Americas | Technology |  |  |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |  |  |
Impairment of intangible assets, finite-lived | 16 |  |  |  |  |  |
EMEA |  |  |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |  |  |
Goodwill | 2,111 |  | 2,132 | 2,111 | 2,132 | 2,255 |
Goodwill impairment loss |  |  |  |  | 230 |  |
Amortization of intangible assets |  |  |  | 68 | $ 80 | 74 |
EMEA | Customer relationships |  |  |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |  |  |
Impairment of intangible assets, finite-lived | 90 |  |  |  |  |  |
Global Products Segment |  |  |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |  |  |
Impairment of intangible assets, finite-lived |  |  | $ 32 |  |  |  |
Impairment, Intangible Asset, Finite-Lived, Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  | Restructuring and impairment costs |  |  |  |
Building Solutions North America Segment |  |  |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |  |  |
Impairment of intangible assets, finite-lived |  |  | $ 13 |  |  |  |
Impairment, Intangible Asset, Finite-Lived, Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  | Restructuring and impairment costs |  |  |  |
Silent-Aire |  |  |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |  |  |
Goodwill impairment loss |  |  |  |  |  | $ 184 |
ADT Mexico Business |  |  |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |  |  |
Goodwill | $ 174 |  |  | $ 174 |  |  |

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