DERIVATIVE ASSETS AND DERIVATIVE LIABILITIES, Derivative Assets and Liability Fair Value (Details) - USD ($) $ in Millions	Mar. 31, 2020	Sep. 30, 2019
Derivative assets
Derivative assets	$ 710	$ 465
Counterparty netting	(93)	(24)
Cash collateral netting	(170)	(103)
Total amounts offset	(263)	(127)
Net amounts presented on the Condensed Consolidated Statements of Financial Condition	447	338
Financial instruments	(372)	(297)
Net amount	75	41
Notional amount	21,194	15,271
Derivative liabilities
Derivative liabilities	645	434
Counterparty netting	(93)	(24)
Cash collateral netting	(125)	(97)
Total amounts offset	(218)	(121)
Net amounts presented on the Condensed Consolidated Statements of Financial Condition	427	313
Financial instruments	(351)	(280)
Net amount	76	33
Derivatives not designated as hedging instruments
Derivative assets
Derivative assets	710	464
Notional amount	19,528	13,565
Derivative liabilities
Derivative liabilities	641	433
Derivatives not designated as hedging instruments \| Interest rate - matched book
Derivative assets
Matched book	351	280
Notional amount	2,265	2,296
Derivative liabilities
Derivatives With Offsetting Matched Book Positions Fair Value Liability	351	280
Derivatives not designated as hedging instruments \| Other
Derivative assets
Derivative assets	359	184
Notional amount	16,686	10,690
Derivative liabilities
Derivative liabilities	286	146
Derivatives not designated as hedging instruments \| Foreign exchange
Derivative assets
Derivative assets	0	0
Notional amount	576	573
Derivative liabilities
Derivative liabilities	3	1
Derivatives not designated as hedging instruments \| Equity
Derivative assets
Derivative assets	0	0
Notional amount	1	6
Derivative liabilities
Derivative liabilities	1	6
Derivatives designated as hedging instruments
Derivative assets
Derivative assets	0	1
Notional amount	1,666	1,706
Derivative liabilities
Derivative liabilities	4	1
Derivatives designated as hedging instruments \| Interest rate
Derivative assets
Derivative assets	0	1
Notional amount	850	850
Derivative liabilities
Derivative liabilities	1	0
Derivatives designated as hedging instruments \| Foreign exchange
Derivative assets
Derivative assets	0	0
Notional amount	816	856
Derivative liabilities
Derivative liabilities	$ 3	$ 1

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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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