Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4A
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480434/815-10-50-4A

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Indicates line item in statement of income or comprehensive income that includes gain (loss) from derivative.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4E
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480434/815-10-50-4E

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DERIVATIVE ASSETS AND DERIVATIVE LIABILITIES, Income Statement Location (Details) - Derivatives not designated as hedging instruments - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Interest rate
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives	$ 3	$ 5	$ 4	$ 11
Interest rate \| Principal transactions
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives, location			Principal transactions	Principal transactions
Interest rate \| Other revenues \| Other
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives, location			Revenue from contract with customer	Revenue from contract with customer
Foreign exchange
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives	25	(6)	$ (8)	$ (36)
Gain (loss) on derivatives, location			Revenue from contract with customer	Revenue from contract with customer
Other
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives	$ 0	$ 0	$ 0	$ (1)
Gain (loss) on derivatives, location			Principal transactions	Principal transactions