DERIVATIVE ASSETS AND DERIVATIVE LIABILITIES, Derivative Assets and Liability Fair Value (Details) - USD ($) $ in Millions	Dec. 31, 2020	Sep. 30, 2020
Derivative assets
Derivative assets	$ 496	$ 573
Counterparty netting	(41)	(40)
Cash collateral netting	(87)	(95)
Total amounts offset	(128)	(135)
Derivative assets	368	438
Financial instruments	(289)	(349)
Net amount	79	89
Notional amount	21,974	24,309
Derivative liabilities
Derivative liabilities	448	505
Counterparty netting	(41)	(40)
Cash collateral netting	(97)	(72)
Total amounts offset	(138)	(112)
Net amounts presented on the Condensed Consolidated Statements of Financial Condition	310	393
Financial instruments	(273)	(333)
Net amount	37	60
Derivatives not designated as hedging instruments
Derivative assets
Derivative assets	496	573
Notional amount	20,229	22,593
Derivative liabilities
Derivative liabilities	441	502
Derivatives not designated as hedging instruments \| Interest rate - matched book
Derivative assets
Interest rate - matched book	273	333
Notional amount	1,985	2,174
Derivative liabilities
Interest rate - matched book	273	333
Derivatives not designated as hedging instruments \| Interest rate - other
Derivative assets
Derivative assets	223	240
Notional amount	17,017	19,206
Derivative liabilities
Derivative liabilities	161	161
Derivatives not designated as hedging instruments \| Foreign exchange
Derivative assets
Derivative assets	0	0
Notional amount	645	605
Derivative liabilities
Derivative liabilities	4	2
Derivatives not designated as hedging instruments \| Other
Derivative assets
Derivative assets	0	0
Notional amount	582	608
Derivative liabilities
Derivative liabilities	3	6
Derivatives designated as hedging instruments
Derivative assets
Derivative assets	0	0
Notional amount	1,745	1,716
Derivative liabilities
Derivative liabilities	7	3
Derivatives designated as hedging instruments \| Interest rate
Derivative assets
Derivative assets	0	0
Notional amount	850	850
Derivative liabilities
Derivative liabilities	0	0
Derivatives designated as hedging instruments \| Foreign exchange
Derivative assets
Derivative assets	0	0
Notional amount	895	866
Derivative liabilities
Derivative liabilities	$ 7	$ 3

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