INCOME TAXES, Deferred Tax Asset (Liability) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Sep. 30, 2019
Deferred tax assets:
Deferred compensation	$ 229	$ 192
Allowances for loan losses and reserves for unfunded commitments	89	56
Unrealized loss associated with foreign currency translations	8	10
Unrealized loss associated with cash flow hedges	18	6
Accrued expenses	34	35
Partnership investments	13	12
Lease liabilities	80	0
Other	16	12
Total deferred tax assets	487	323
Deferred tax liabilities:
Goodwill and identifiable intangible assets	(34)	(28)
Property and equipment	(81)	(57)
Lease ROU assets	(80)	0
Unrealized gain associated with available-for-sale securities	(30)	(7)
Total deferred tax liabilities	(225)	(92)
Net deferred tax assets	262	231
Deferred income taxes, net	262	231
Cumulative amount of undistributed earnings attributable to foreign subsidiaries	311
Income tax receivable current	17	22
Accrued income taxes, current	$ 82	$ 49