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GOODWILL AND OTHER INTANGIBLES - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract] |  |  |
Amortization of intangible assets | $ 1,174 | $ 1,366 | $ 764
Future amortization expense, 2026 | 1,110 |  |
Future amortization expense, 2027 | 1,076 |  |
Future amortization expense, 2028 | 1,030 |  |
Future amortization expense, 2029 | 977 |  |
Future amortization expense, 2030 | $ 940 |  |

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