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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		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Conversion of Stock [Line Items]
Recovery through conversion rate adjustment	$ 0	$ 0	$ 1	$ 0
Series B preferred stock
Conversion of Stock [Line Items]
Reduction in equivalent number of class A common stock (in shares)			0	1
Effective price per share (in dollars per share)			$ 219.12	$ 203.08
Recovery through conversion rate adjustment			$ 19	$ 135
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)			$ 215.28	$ 202.55
Recovery through conversion rate adjustment			$ 11	$ 6

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Amount Recovered Through Conversion Rate Adjustment

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- Definition

Reduction In Equivalent Number of As-Converted Shares Through Recovery Of VE Territory Covered Losses

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Share Reduction Price Paid Per Share In The Recovery of VE Territory Covered Losses

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