DERIVATIVE ASSETS AND DERIVATIVE LIABILITIES, Narrative (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
|
| Derivative Instruments and Hedging Activities Disclosure [Abstract] | ||||
| Gain (loss) excluded from assessment of hedge effectiveness | $ 0 | $ 0 | $ 0 | $ 0 |
| Amount of interest expense expected to reclassify from AOCI | $ 11 | $ 11 | ||
| Maximum length of time hedged in cash flow hedge (in years) | 2 years | |||