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BANK DEPOSITS, Summary of Interest Expense on Deposits (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Deposits [Abstract]
Money market and savings accounts	$ 117	$ 142	$ 359	$ 446
Interest-bearing demand deposits	204	212	589	646
Certificates of deposit	27	19	69	71
Total interest expense on deposits	$ 348	$ 373	$ 1,017	$ 1,163

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Aggregate amount of interest expense on all deposits.

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-Name Accounting Standards Codification
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Amount of interest expense on domestic checking deposit liabilities.

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The aggregate interest expense incurred on the following for deposits in domestic offices: (1) transaction accounts (NOW, and telephone and preauthorized transfer accounts), (2) money market deposits and (3) savings deposits.

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The aggregate interest expense incurred on time deposits, including certificates of deposits, in domestic offices.

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