OTHER FINANCIAL INFORMATION - Schedule of Other Intangible Assets (Details) - USD ($) $ in Millions	Mar. 31, 2024	Sep. 30, 2023
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 15,484	$ 10,111
Less: Accumulated amortization	4,508	3,848
Net carrying amount	10,976	6,263
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Net carrying amount	6,501	3,353
Intellectual Property
Finite-Lived Intangible Assets [Line Items]
Net carrying amount	$ 4,247	$ 2,707