v3.26.1
DERIVATIVE ASSETS AND DERIVATIVE LIABILITIES, Income Statement Location (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2026
Mar. 31, 2025
Interest rate        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains/(losses) on derivatives $ 3 $ 4 $ 6 $ 7
Foreign exchange        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains/(losses) on derivatives 9 (13) 8 48
Net gains/(losses) on derivatives, net of gains/(losses) on related hedged item 1 2 3 4
Other        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains/(losses) on derivatives $ 1 $ 8 $ 3 $ 2