CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) - $ / shares shares in Millions	Mar. 31, 2024	Sep. 30, 2023
Preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, shares issued (in shares)	5	5
Preferred stock, shares outstanding (in shares)	5	5
Common stock
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Class A common stock
Common stock, shares issued (in shares)	1,574	1,594
Common stock, shares outstanding (in shares)	1,574	1,594
Class B-1 common stock
Common stock, shares issued (in shares)	245	245
Common stock, shares outstanding (in shares)	245	245
Class C common stock
Common stock, shares issued (in shares)	9	10
Common stock, shares outstanding (in shares)	9	10