DERIVATIVE ASSETS AND DERIVATIVE LIABILITIES, Derivative Asset and Liability Fair Value (Details) - USD ($) $ in Millions	Sep. 30, 2022	Sep. 30, 2021
Derivative assets
Derivative assets	$ 536	$ 342
Counterparty netting	(35)	(46)
Cash collateral netting	(313)	(41)
Total amounts offset	(348)	(87)
Net amounts presented on the Consolidated Statements of Financial Condition	188	255
Financial instruments	(60)	(205)
Net amount	128	50
Derivative liabilities
Derivative liabilities	595	316
Counterparty netting	(35)	(46)
Cash collateral netting	(30)	(42)
Total amounts offset	(65)	(88)
Net amounts presented on the Consolidated Statements of Financial Condition	530	228
Financial instruments	(52)	(193)
Net amount	478	35
Notional amount	19,618	19,989
Derivatives not designated as hedging instruments
Derivative assets
Derivative assets	518	340
Derivative liabilities
Derivative liabilities	595	316
Notional amount	17,476	18,200
Derivatives not designated as hedging instruments | Interest rate - matched book
Derivative assets
Interest rate - matched book	52	193
Derivative liabilities
Interest rate - matched book	52	193
Notional amount	1,340	1,736
Derivatives not designated as hedging instruments | Interest rate - other
Derivative assets
Derivative assets	462	144
Derivative liabilities
Derivative liabilities	535	122
Notional amount	14,647	15,087
Derivatives not designated as hedging instruments | Foreign exchange
Derivative assets
Derivative assets	4	3
Derivative liabilities
Derivative liabilities	5	0
Notional amount	958	826
Derivatives not designated as hedging instruments | Other
Derivative assets
Derivative assets	0	0
Derivative liabilities
Derivative liabilities	3	1
Notional amount	531	551
Derivatives designated as hedging instruments
Derivative assets
Derivative assets	18	2
Derivative liabilities
Derivative liabilities	0	0
Notional amount	2,142	1,789
Derivatives designated as hedging instruments | Interest rate - other
Derivative assets
Derivative assets	12	0
Derivative liabilities
Derivative liabilities	0	0
Notional amount	1,050	850
Derivatives designated as hedging instruments | Foreign exchange
Derivative assets
Derivative assets	6	2
Derivative liabilities
Derivative liabilities	0	0
Notional amount	$ 1,092	$ 939