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Stockholders' Equity - Number of Shares of Class A Common Shares Outstanding on an As-Converted Basis (Detail) shares in Millions | Sep. 30, 2023 shares | Sep. 30, 2022 shares
--- | --- | ---
Class of Stock [Line Items] |  |
As-converted Class A Common Stock (in shares) | 2,047 | 2,103
Series A preferred stock |  |
Class of Stock [Line Items] |  |
Preferred stock, shares outstanding (in shares) | 0 | 0
Preferred stock conversion rate | 100.0000 | 100.0000
As-converted Class A Common Stock (in shares) | 7 | 16
Series B preferred stock |  |
Class of Stock [Line Items] |  |
Preferred stock, shares outstanding (in shares) | 2 | 2
Preferred stock conversion rate | 2.9370 | 2.9710
As-converted Class A Common Stock (in shares) | 7 | 7
Series C preferred stock |  |
Class of Stock [Line Items] |  |
Preferred stock, shares outstanding (in shares) | 3 | 3
Preferred stock conversion rate | 3.6290 | 3.6450
As-converted Class A Common Stock (in shares) | 11 | 12
Class A common stock |  |
Class of Stock [Line Items] |  |
Common stock, shares, outstanding (in shares) | 1,594 | 1,635
As-converted Class A Common Stock (in shares) | 1,594 | 1,635
Class B common stock |  |
Class of Stock [Line Items] |  |
Common stock, shares, outstanding (in shares) | 245 | 245
Common stock, conversion rate | 1.5875 | 1.6059
As-converted Class A Common Stock (in shares) | 390 | 394
Class C common stock |  |
Class of Stock [Line Items] |  |
Common stock, shares, outstanding (in shares) | 10 | 10
Common stock, conversion rate | 4.0000 | 4.0000
As-converted Class A Common Stock (in shares) | 38 | 39

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