OTHER FINANCIAL INFORMATION - Schedule of Other Intangible Assets (Details) - USD ($) $ in Millions	Mar. 31, 2025	Sep. 30, 2024
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