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Assets and Liabilities Held For Sale (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2025	Sep. 30, 2024
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total assets		$ 37,939	$ 42,695
Disposal Group, Held-for-sale, Not Discontinued Operations | Global Products Segment
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal group, not discontinued operation, loss on write-down	$ 438
Disposal Group, Held-for-sale, Not Discontinued Operations | ADT Mexico Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total assets		154
Liabilities		$ 21

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