COLLATERALIZED AGREEMENTS AND FINANCINGS, Schedule of Offsetting Transactions (Details) - USD ($) $ in Millions	Sep. 30, 2020	Sep. 30, 2019
Reverse repurchase agreements
Gross amounts of recognized assets/liabilities	$ 207	$ 343
Gross amounts offset on the Consolidated Statements of Financial Condition	0	0
Net amounts presented on the Consolidated Statements of Financial Condition	207	343
Gross amounts not offset on the Consolidated Statements of Financial Condition	(207)	(343)
Net amount	0	0
Securities borrowed
Gross amounts of recognized assets/liabilities	215	248
Gross amounts offset on the Consolidated Statements of Financial Condition	0	0
Net amounts presented on the Consolidated Statements of Financial Condition	215	248
Gross amounts not offset on the Consolidated Statements of Financial Condition	(209)	(243)
Net amount	6	5
Assets, Total
Carrying Value of Securities Purchased under Agreements to Resell and Deposits Paid for Securities Borrowed	422	591
Securities Purchased Under Agreements To Resell And Securities Borrowed, Liability	0	0
Collateralized agreements	422	591
Securities, Amount Offset Against Collateral	(416)	(586)
Securities Borrowed And Sold, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement	6	5
Repurchase agreements
Gross amounts of recognized assets/liabilities	165	150
Gross amounts offset on the Consolidated Statements of Financial Condition	0	0
Net amounts presented on the Consolidated Statements of Financial Condition	165	150
Gross amounts not offset on the Consolidated Statements of Financial Condition	(165)	(150)
Net amount	0	0
Securities loaned
Gross amounts of recognized assets/liabilities	85	323
Gross amounts offset on the Consolidated Statements of Financial Condition	0	0
Net amounts presented on the Consolidated Statements of Financial Condition	85	323
Gross amounts not offset on the Consolidated Statements of Financial Condition	(79)	(311)
Net amount	6	12
Liabilities, Total
Gross amounts of recognized assets/liabilities	250	473
Gross amounts offset on the Consolidated Statements of Financial Condition	0	0
Net amounts presented on the Consolidated Statements of Financial Condition	250	473
Gross amounts not offset on the Consolidated Statements of Financial Condition	(244)	(461)
Net amount	$ 6	$ 12

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