DERIVATIVE ASSETS AND DERIVATIVE LIABILITIES, Income Statement Location (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Interest rate
Derivative Instruments, Gain (Loss) [Line Items]
Gains/(losses) on derivatives	$ 3	$ 3
Foreign exchange
Derivative Instruments, Gain (Loss) [Line Items]
Gains/(losses) on derivatives	(1)	61
Net gains on derivatives, net of gains/(losses) on related hedged item	2	2
Other
Derivative Instruments, Gain (Loss) [Line Items]
Gains/(losses) on derivatives	$ 2	$ (6)