INCOME TAXES, Income Tax Provision/(Benefit) Allocation (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Included in:
Net income	$ 579	$ 575	$ 541
Equity, arising from available-for-sale securities recorded through OCI	30	149	3
Equity, arising from cash flow hedges recorded through OCI	(2)	(12)	0
Equity, arising from currency translations, net of the impact of net investment hedges recorded through OCI	13	0	(4)
Total provision for income taxes	$ 620	$ 712	$ 540