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OTHER FINANCIAL INFORMATION - Schedule of Other Intangible Assets (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Sep. 30, 2024
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Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | $ 15,575 | $ 15,628
Less: Accumulated amortization | 5,752 | 5,192
Net carrying amount | 9,823 | 10,436
Customer Relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Net carrying amount | 5,953 | 6,296
Intellectual Property |  |
Finite-Lived Intangible Assets [Line Items] |  |
Net carrying amount | $ 3,618 | $ 3,901

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