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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Sep. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in Carrying Amount of Goodwill | The changes in the carrying amount of goodwill in each of the Company’s reportable segments were as follows (in millions):
|  | Year Ended September 30, 2025
|  | Americas |  | EMEA |  | APAC |  | Total
Goodwill |  | $ | 14,118 |  |  | $ | 2,409 |  |  | $ | 1,393 |  |  | 17,920 |
Accumulated impairment loss |  | (918) |  |  | (277) |  |  | — |  |  | (1,195) |
Balance at beginning of period |  | 13,200 |  |  | 2,132 |  |  | 1,393 |  |  | 16,725 |
Foreign currency translation and other (1) |  | (26) |  |  | (21) |  |  | (45) |  |  | (92) |
Balance at end of period |  | $ | 13,174 |  |  | $ | 2,111 |  |  | $ | 1,348 |  |  | $ | 16,633 |
(1) Includes measurement period adjustments and the allocation of $86 million of goodwill from EMEA to the ADT Mexico residential security business disposal group classified as held for sale. Refer to Note 3, "Assets and Liabilities Held for Sale," of the notes to consolidated financial statements for further information.
|  | Year Ended September 30, 2024 |
|  | Americas |  | EMEA |  | APAC |  | Total |
Goodwill |  | $ | 14,090 |  |  | $ | 2,302 |  |  | $ | 1,345 |  |  | 17,737 |  |
Accumulated impairment loss |  | (918) |  |  | (47) |  |  | — |  |  | (965) |  |
Balance at beginning of period |  | 13,172 |  |  | 2,255 |  |  | 1,345 |  |  | 16,772 |  |
Impairments |  | — |  |  | (230) |  |  | — |  |  | (230) |  |
Foreign currency translation and other (1) |  | 28 |  |  | 107 |  |  | 48 |  |  | 183 |  |
Balance at end of period |  | $ | 13,200 |  |  | $ | 2,132 |  |  | $ | 1,393 |  |  | $ | 16,725 |  |
(1) Includes measurement period adjustments and the allocation of $21 million of goodwill from the ADTi disposal group classified as held for sale in June 2024 and subsequently divested in July 2024. Refer to Note 2, "Acquisitions and Divestitures," of the notes to consolidated financial statements for further information.
Other Intangible Assets | The Company’s other intangible assets, primarily from business acquisitions, consisted of (in millions):
| September 30,
| 2025 |  | 2024
| Gross Carrying Amount |  | Accumulated Amortization |  | Net |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net
Definite-lived intangible assets |  |  |  |  |  |  |  |  |  |  |
Technology | $ | 1,197 |  |  | $ | (714) |  |  | $ | 483 |  |  | $ | 1,592 |  |  | $ | (955) |  |  | $ | 637 |
Customer relationships | 2,026 |  |  | (1,272) |  |  | 754 |  |  | 2,632 |  |  | (1,517) |  |  | 1,115 |
Miscellaneous | 910 |  |  | (511) |  |  | 399 |  |  | 886 |  |  | (480) |  |  | 406 |
| 4,133 |  |  | (2,497) |  |  | 1,636 |  |  | 5,110 |  |  | (2,952) |  |  | 2,158 |
Indefinite-lived intangible assets |  |  |  |  |  |  |  |  |  |  |
Trademarks/tradenames | 1,977 |  |  | — |  |  | 1,977 |  |  | 1,972 |  |  | — |  |  | 1,972 |
Total intangible assets | $ | 6,110 |  |  | $ | (2,497) |  |  | $ | 3,613 |  |  | $ | 7,082 |  |  | $ | (2,952) |  |  | $ | 4,130 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense | The following table summarizes estimated amortization of existing definite-lived intangible assets as of September 30, 2025 for each of the next five fiscal years (in millions):
2026 |  | $ | 347 |
2027 |  | 323 |
2028 |  | 268 |
2029 |  | 175 |
2030 |  | 172 |

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