COLLATERALIZED AGREEMENTS AND FINANCINGS, Schedule of Offsetting Transactions (Details) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022
Reverse repurchase agreements
Gross amounts of recognized assets/liabilities	$ 187	$ 367
Gross amounts offset on the Consolidated Statements of Financial Condition	0	0
Net amounts included in the Consolidated Statements of Financial Condition	187	367
Gross amounts not offset on the Consolidated Statements of Financial Condition	(187)	(367)
Net amounts	0	0
Securities borrowed
Gross amounts of recognized assets/liabilities	231	337
Gross amounts offset on the Consolidated Statements of Financial Condition	0	0
Net amounts included in the Consolidated Statements of Financial Condition	231	337
Gross amounts not offset on the Consolidated Statements of Financial Condition	(224)	(327)
Net amounts	7	10
Gross amounts of recognized assets/liabilities	418	704
Gross amounts offset on the Consolidated Statements of Financial Condition	0	0
Net amounts included in the Consolidated Statements of Financial Condition	418	704
Gross amounts not offset on the Consolidated Statements of Financial Condition	(411)	(694)
Net amounts	7	10
Repurchase agreements
Gross amounts of recognized assets/liabilities	157	294
Gross amounts offset on the Consolidated Statements of Financial Condition	0	0
Net amounts included in the Consolidated Statements of Financial Condition	157	294
Gross amounts not offset on the Consolidated Statements of Financial Condition	(157)	(294)
Net amounts	0	0
Securities loaned
Gross amounts of recognized assets/liabilities	180	172
Gross amounts offset on the Consolidated Statements of Financial Condition	0	0
Net amounts included in the Consolidated Statements of Financial Condition	180	172
Gross amounts not offset on the Consolidated Statements of Financial Condition	(173)	(162)
Net amounts	7	10
Gross amounts of recognized assets/liabilities	337	466
Gross amounts offset on the Consolidated Statements of Financial Condition	0	0
Net amounts included in the Consolidated Statements of Financial Condition	337	466
Gross amounts not offset on the Consolidated Statements of Financial Condition	(330)	(456)
Net amounts	$ 7	$ 10