INCOME TAXES, Income Tax Allocation (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Included in:
Net income	$ 575	$ 541	$ 513
Equity, arising from available-for-sale securities recorded through OCI	149	3	(311)
Equity, arising from cash flow hedges recorded through OCI	(12)	0	24
Equity, arising from currency translations, net of the impact of net investment hedges recorded through OCI	0	(4)	23
Total provision for income taxes	$ 712	$ 540	$ 249