SHAREHOLDERS' EQUITY, Preferred Stock Dividends (Details) - USD ($) $ / shares in Units, $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
|
| Equity [Abstract] | ||||
| Dividends declared | $ 1 | $ 1 | $ 4 | $ 4 |
| Dividends declared (in usd per share) | $ 15.94 | $ 15.94 | $ 47.82 | $ 47.82 |
| Dividends paid | $ 1 | $ 1 | $ 4 | $ 4 |
| Dividends paid (in usd per share) | $ 15.94 | $ 15.94 | $ 47.82 | $ 47.82 |