VARIABLE INTEREST ENTITIES, Primary Beneficiary - Aggregate Assets and Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2022	Sep. 30, 2021
Variable interest entity, consolidated, aggregate assets and liabilities [Abstract]
Aggregate assets	$ 80,951	$ 61,891
Aggregate liabilities	71,519	53,588
Variable Interest Entity, Primary Beneficiary
Variable interest entity, consolidated, aggregate assets and liabilities [Abstract]
Aggregate assets	76	192
Aggregate liabilities	23	71
Variable Interest Entity, Primary Beneficiary | LIHTC funds
Variable interest entity, consolidated, aggregate assets and liabilities [Abstract]
Aggregate assets	59	111
Aggregate liabilities	6	52
Variable Interest Entity, Primary Beneficiary | Private Equity Interests
Variable interest entity, consolidated, aggregate assets and liabilities [Abstract]
Aggregate assets		66
Aggregate liabilities		4
Variable Interest Entity, Primary Beneficiary | Restricted Stock Trust Fund
Variable interest entity, consolidated, aggregate assets and liabilities [Abstract]
Aggregate assets	17	15
Aggregate liabilities	$ 17	$ 15