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Goodwill and Other Intangible Assets - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Sep. 30, 2024
Goodwill [Line Items] |  |  |  |  |
Goodwill | $ 16,709 |  | $ 16,709 |  | $ 16,725
Amortization of intangible assets | 110 | $ 116 | 342 | $ 357 |
ADT Mexico Business |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill | $ 174 |  | $ 174 |  |
ADT Mexico Business | Measurement Input, Discount Rate |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Percentage change in fair value input that would cause the fair value to be less than the carrying value | 0.50% |  | 0.50% |  |
ADT Mexico Business | Measurement Input, Long-Term Revenue Growth Rate |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Percentage change in fair value input that would cause the fair value to be less than the carrying value | 1.00% |  | 1.00% |  |

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