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DERIVATIVE ASSETS AND DERIVATIVE LIABILITIES, Income Statement Location (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Interest rate        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains/(losses) on derivatives $ 2 $ 4 $ 8 $ 11
Foreign exchange        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains/(losses) on derivatives 6 (48) 14 0
Net gains/(losses) on derivatives, net of gains/(losses) on related hedged item 1 3 4 7
Other        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains/(losses) on derivatives $ 0 $ (6) $ 3 $ (3)