LEASES, Operating Lease Assets and Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2021	Sep. 30, 2020
Leases [Abstract]
ROU assets (included in Other assets)	$ 446	$ 321
Lease liabilities (included in Other payables)	$ 450	$ 345
Operating lease, right of use asset, statement of financial position, extensible list	Other assets	Other assets
Operating lease, liability, statement of financial position, extensible list	Other Liabilities	Other Liabilities