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Stockholders' Equity - Effect of VE Territory Covered Losses Through Conversion Rate Adjustments (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Conversion of Stock [Line Items]
Recovery through conversion rate adjustment	$ 0	$ 0
Series B preferred stock
Conversion of Stock [Line Items]
Reduction in equivalent number of class A common stock (in shares)	0	0
Effective price per share (in dollars per share)	$ 312.39	$ 254.32
Recovery through conversion rate adjustment	$ 5	$ 22
Series C preferred stock
Conversion of Stock [Line Items]
Reduction in equivalent number of class A common stock (in shares)	0	0
Effective price per share (in dollars per share)	$ 312.39	$ 254.32
Recovery through conversion rate adjustment	$ 3	$ 3