CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (UNAUDITED) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024	Sep. 30, 2024	Sep. 30, 2023
Dividends declared, quarterly, per share (in dollars per share)	$ 0.59	$ 0.52	$ 0.59	$ 0.52
Dividends paid, quarterly, per share (in dollars per share)	$ 0.59	$ 0.52	$ 0.59	$ 0.52
Preferred stock	$ 880		$ 880		$ 1,031
Series A preferred stock
Preferred stock	$ 397	$ 385	$ 397	$ 385	$ 540	$ 456