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Stockholders' Equity - Number of Shares of Class A Common Shares Outstanding on an As-Converted Basis (Details) shares in Millions | Mar. 31, 2024 shares | Sep. 30, 2023 shares
--- | --- | ---
Schedule of Common Stock as Converted [Line Items] |  |
Preferred stock, shares outstanding (in shares) | 5 | 5
As-converted Class A Common Stock (in shares) | 2,025 | 2,047
Series A preferred stock |  |
Schedule of Common Stock as Converted [Line Items] |  |
Preferred stock, shares outstanding (in shares) | 0 | 0
Preferred stock, conversion rate into Class A Common Stock | 100.0000 | 100.0000
As-converted Class A Common Stock (in shares) | 6 | 7
Series B preferred stock |  |
Schedule of Common Stock as Converted [Line Items] |  |
Preferred stock, shares outstanding (in shares) | 2 | 2
Preferred stock, conversion rate into Class A Common Stock | 2.9030 | 2.9370
As-converted Class A Common Stock (in shares) | 7 | 7
Series C preferred stock |  |
Schedule of Common Stock as Converted [Line Items] |  |
Preferred stock, shares outstanding (in shares) | 3 | 3
Preferred stock, conversion rate into Class A Common Stock | 3.6250 | 3.6290
As-converted Class A Common Stock (in shares) | 11 | 11
Class A common stock |  |
Schedule of Common Stock as Converted [Line Items] |  |
Common stock, shares outstanding (in shares) | 1,574 | 1,594
As-converted Class A Common Stock (in shares) | 1,574 | 1,594
Class B-1 common stock |  |
Schedule of Common Stock as Converted [Line Items] |  |
Common stock, shares outstanding (in shares) | 245 | 245
Common stock, conversion rate into Class A Common Stock | 1.5875 | 1.5875
As-converted Class A Common Stock (in shares) | 390 | 390
Class C common stock |  |
Schedule of Common Stock as Converted [Line Items] |  |
Common stock, shares outstanding (in shares) | 9 | 10
Common stock, conversion rate into Class A Common Stock | 4.0000 | 4.0000
As-converted Class A Common Stock (in shares) | 37 | 38

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