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DERIVATIVE ASSETS AND DERIVATIVE LIABILITIES, Derivative Gain (Loss) Recognized in AOCI (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Derivative Instruments, Gain (Loss) [Line Items]        
Interest rate (cash flow hedges) $ (1) $ (3) $ (3) $ (2)
Total gains/(losses) included in AOCI, net of taxes 22 (49) 26 12
Interest rate        
Derivative Instruments, Gain (Loss) [Line Items]        
Interest rate (cash flow hedges) (1) (3) (3) (2)
Foreign exchange        
Derivative Instruments, Gain (Loss) [Line Items]        
Foreign exchange (net investment hedges) $ 23 $ (46) $ 29 $ 14