OTHER FINANCIAL DATA - Schedule of Depreciation and Amortization Expense Components (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Business Combination [Line Items]
Depreciation expense	$ 344	$ 323	$ 287
Amortization of intangibles (includes $196, $197 and $199 reported in Cost of Sales in 2023, 2024 and 2025, respectively)	1,083	1,274	678
Amortization of capitalized software	91	92	86
Total	1,518	1,689	1,051
Amortization if intangibles reported in Cost of Sales	199	197	196
Amortization of intangible assets	1,174	1,366	$ 764
NI Acquisition
Business Combination [Line Items]
Amortization of intangible assets	$ 425	$ 560