BANK DEPOSITS, Bank Deposits by Insured and Uninsured (Details) - USD ($) $ in Millions |
Jun. 30, 2025 |
Sep. 30, 2024 |
|---|---|---|
| Deposits [Abstract] | ||
| FDIC-insured bank deposits | $ 48,836 | $ 48,964 |
| Bank deposits exceeding FDIC insurance limit | 8,413 | 7,046 |
| Total bank deposits | $ 57,249 | $ 56,010 |
| FDIC-insured bank deposits as a % of total bank deposits | 85.00% | 87.00% |
| Related Party Transaction [Line Items] | ||
| Bank deposits exceeding FDIC insurance limit | $ 8,413 | $ 7,046 |
| Related party | ||
| Deposits [Abstract] | ||
| Bank deposits exceeding FDIC insurance limit | 1,140 | 1,050 |
| Related Party Transaction [Line Items] | ||
| Bank deposits exceeding FDIC insurance limit | $ 1,140 | $ 1,050 |
| X | ||||||||||
- Definition Deposits, At Or Above FDIC Insurance Limit No definition available.
|
| X | ||||||||||
- Definition Deposits Below FDIC Insurance Limit No definition available.
|
| X | ||||||||||
- Definition Deposits Below FDIC Insurance Limit, Percentage No definition available.
|
| X | ||||||||||
- Definition The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- 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. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Details
|