DERIVATIVE ASSETS AND DERIVATIVE LIABILITIES, Derivative Gain (Loss) Recognized in AOCI (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Derivative Instruments, Gain (Loss) [Line Items]
Cash flow hedges	$ 12	$ 10	$ (1)	$ 48
Total gains/(losses) included in AOCI, net of taxes	(4)	34	(34)	62
Interest rate
Derivative Instruments, Gain (Loss) [Line Items]
Cash flow hedges	12	10	(1)	48
Foreign exchange
Derivative Instruments, Gain (Loss) [Line Items]
Net investment hedges	$ (16)	$ 24	$ (33)	$ 14