INCOME TAXES, Deferred Tax Asset (Liability) (Details) - USD ($) $ in Millions	Sep. 30, 2022	Sep. 30, 2021
Deferred tax assets:
Unrealized loss associated with available-for-sale securities	$ 343	$ 2
Deferred compensation	272	287
Lease liabilities	121	115
Allowances for credit losses	106	81
Accrued expenses	54	46
Unrealized loss associated with loan portfolios	34	0
Unrealized loss associated with foreign currency translations	27	3
Partnership investments	2	9
Unrealized loss associated with cash flow hedges	0	9
Other	31	18
Total deferred tax assets	990	570
Deferred tax liabilities:
Goodwill and identifiable intangible assets	(126)	(64)
Lease ROU assets	(118)	(114)
Property and equipment	(110)	(85)
Unrealized gain associated with cash flow hedges	(15)	0
Other	(5)	(2)
Total deferred tax liabilities	(374)	(265)
Net deferred tax assets	616	305
Deferred income tax assets, net	630	305
Cumulative amount of undistributed earnings attributable to foreign subsidiaries	431
Income tax receivable current	7	12
Accrued income taxes, current	28	7
Other payables
Deferred tax liabilities:
Deferred income tax liabilities, net	$ (14)	$ 0