OTHER FINANCIAL INFORMATION - Schedule of Other Intangible Assets (Details) - USD ($) $ in Millions	Dec. 31, 2024	Sep. 30, 2024
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 15,447	$ 15,628
Less: Accumulated amortization	5,422	5,192
Net carrying amount	10,025	10,436
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Net carrying amount	6,029	6,296
Intellectual Property
Finite-Lived Intangible Assets [Line Items]
Net carrying amount	$ 3,751	$ 3,901