CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Dividends paid, quarterly, per share (in dollars per share)	$ 0.52	$ 0.45	$ 0.375
Dividends declared, quarterly, per share (in dollars per share)	$ 0.52	$ 0.45	$ 0.375
Preferred stock	$ 1,031	$ 1,698
Series A preferred stock
Preferred stock	$ 540	$ 456	$ 1,000	$ 486