v3.25.2
DERIVATIVE ASSETS AND DERIVATIVE LIABILITIES, Income Statement Location (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Foreign exchange        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains/(losses) on derivatives, net of gains/(losses) on related hedged item $ 3 $ 2 $ 7 $ 5
Derivatives not designated as hedging instruments | Interest rate        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains/(losses) on derivatives 4 3 11 7
Derivatives not designated as hedging instruments | Foreign exchange        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains/(losses) on derivatives (48) 11 0 3
Derivatives not designated as hedging instruments | Other        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains/(losses) on derivatives $ (6) $ 0 $ (3) $ 0