COLLATERALIZED AGREEMENTS AND FINANCINGS, Schedule of Offsetting Transactions (Details) - USD ($) $ in Millions	Mar. 31, 2023	Sep. 30, 2022
Reverse repurchase agreements
Gross amounts of recognized assets/liabilities	$ 167	$ 367
Gross amounts offset on the Condensed Consolidated Statements of Financial Condition	0	0
Net amounts included in the Condensed Consolidated Statements of Financial Condition	167	367
Gross amounts not offset on the Condensed Consolidated Statements of Financial Condition	(167)	(367)
Net amounts	0	0
Securities borrowed
Gross amounts of recognized assets/liabilities	212	337
Gross amounts offset on the Condensed Consolidated Statements of Financial Condition	0	0
Net amounts included in the Condensed Consolidated Statements of Financial Condition	212	337
Gross amounts not offset on the Condensed Consolidated Statements of Financial Condition	(211)	(327)
Net amounts	1	10
Gross amounts of recognized assets/liabilities	379	704
Gross amounts offset on the Condensed Consolidated Statements of Financial Condition	0	0
Net amounts included in the Condensed Consolidated Statements of Financial Condition	379	704
Gross amounts not offset on the Condensed Consolidated Statements of Financial Condition	(378)	(694)
Net amounts	1	10
Repurchase agreements
Gross amounts of recognized assets/liabilities	150	294
Gross amounts offset on the Condensed Consolidated Statements of Financial Condition	0	0
Net amounts included in the Condensed Consolidated Statements of Financial Condition	150	294
Gross amounts not offset on the Condensed Consolidated Statements of Financial Condition	(150)	(294)
Net amounts	0	0
Securities loaned
Gross amounts of recognized assets/liabilities	177	172
Gross amounts offset on the Condensed Consolidated Statements of Financial Condition	0	0
Net amounts included in the Condensed Consolidated Statements of Financial Condition	177	172
Gross amounts not offset on the Condensed Consolidated Statements of Financial Condition	(173)	(162)
Net amounts	4	10
Gross amounts of recognized assets/liabilities	327	466
Gross amounts offset on the Condensed Consolidated Statements of Financial Condition	0	0
Net amounts included in the Condensed Consolidated Statements of Financial Condition	327	466
Gross amounts not offset on the Condensed Consolidated Statements of Financial Condition	(323)	(456)
Net amounts	$ 4	$ 10