COLLATERALIZED AGREEMENTS AND FINANCINGS, Schedule of Offsetting Transactions (Details) - USD ($) $ in Millions	Sep. 30, 2022	Sep. 30, 2021
Reverse repurchase agreements
Gross amounts of recognized assets/liabilities	$ 367	$ 279
Gross amounts offset on the Consolidated Statements of Financial Condition	0	0
Net amounts included in the Consolidated Statements of Financial Condition	367	279
Gross amounts not offset on the Consolidated Statements of Financial Condition	(367)	(279)
Net amounts	0	0
Securities borrowed
Gross amounts of recognized assets/liabilities	337	201
Gross amounts offset on the Consolidated Statements of Financial Condition	0	0
Net amounts included in the Consolidated Statements of Financial Condition	337	201
Gross amounts not offset on the Consolidated Statements of Financial Condition	(327)	(195)
Net amounts	10	6
Assets, Total
Gross amounts of recognized assets/liabilities	704	480
Gross amounts offset on the Consolidated Statements of Financial Condition	0	0
Net amounts included in the Consolidated Statements of Financial Condition	704	480
Gross amounts not offset on the Consolidated Statements of Financial Condition	(694)	(474)
Net amounts	10	6
Repurchase agreements
Gross amounts of recognized assets/liabilities	294	205
Gross amounts offset on the Consolidated Statements of Financial Condition	0	0
Net amounts included in the Consolidated Statements of Financial Condition	294	205
Gross amounts not offset on the Consolidated Statements of Financial Condition	(294)	(205)
Net amounts	0	0
Securities loaned
Gross amounts of recognized assets/liabilities	172	72
Gross amounts offset on the Consolidated Statements of Financial Condition	0	0
Net amounts included in the Consolidated Statements of Financial Condition	172	72
Gross amounts not offset on the Consolidated Statements of Financial Condition	(162)	(68)
Net amounts	10	4
Liabilities, Total
Gross amounts of recognized assets/liabilities	466	277
Gross amounts offset on the Consolidated Statements of Financial Condition	0	0
Net amounts included in the Consolidated Statements of Financial Condition	466	277
Gross amounts not offset on the Consolidated Statements of Financial Condition	(456)	(273)
Net amounts	$ 10	$ 4