CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Dividends paid, quarterly, per share (in dollars per share)	$ 0.59	$ 0.52	$ 0.45
Dividends declared, quarterly, per share (in dollars per share)	$ 0.59	$ 0.52	$ 0.45
Book value of preferred stock	$ 745	$ 1,031
Series A preferred stock
Book value of preferred stock	$ 513	$ 540	$ 456	$ 1,000