GOODWILL AND INTANGIBLE ASSETS - Schedule of Aggregate Amortization Expense (Detail) - USD ($) $ in Millions	12 Months Ended
Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2024
Intangible Asset, Goodwill and Other [Abstract]
Amortization of intangible assets	$ 252	$ 201	$ 161

Amount of amortization expense for finite-lived intangible asset. Excludes goodwill and capitalized cost for software to be sold, leased, or marketed.

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